Showing papers on "Hybrid drive published in 2008"

Parallel hybrid drive system utilizing power take off connection as transfer for a secondary energy source

Abstract: A parallel hybrid vehicle system utilizing the Power Take Off connection on an automatic transmission as a transfer port for a secondary device is described for both driving modes and stationary operation The secondary device is a battery powered electric motor providing motive power or regenerative braking in driving mode or providing power to accessories typically mounted to a conventional PTO while stationary

Mode change control system for hybrid vehicle

Abstract: In a hybrid vehicle in which a mode change between an electric drive mode and a hybrid drive mode is carried out based on information concerning an operating condition and a driving status, an impairment of operability due to a change of the drive mode at a reverse travel of the vehicle is prevented. Upon a start of the reverse travel, the drive mode before the start of the reverse travel is continued at the start of the reverse travel.

Improved Hybrid Drive

Abstract: A non-volatile storage system comprises a hard disk drive (HDD) having a first capacity for storing information therein in a plurality of blocks. The storage system also comprises a non-volatile solid state memory (SSD) having a second capacity, less than the first capacity, for storing information therein. Finally, the storage system comprises a controller having a volatile memory and for controlling the read operation of the HDD and the read/write operation of the SSD. The controller stores in the volatile memory the address of read blocks from the HDD in a first period of time and determines a plurality of the most frequently read blocks in the first period of time, The controller then causes the SSD to store information from the most frequently read blocks from the HDD, and thereafter causes information to be read from the SSD when the storage system is requested to access information from the most frequently read blocks. The controller resets the identity of the most frequently read blocks in the volatile memory after a second period of time, where the second period of time is longer than said first period of time.

Method for operating a drive train

Abstract: The invention relates to a method for operating a drive train of a motor vehicle, wherein the drive train comprises at least one hybrid drive having an internal combustion engine and an electric motor, a transmission disposed between the hybrid drive and a power take-off, and a clutch disposed between the internal combustion engine and the electric motor, wherein, when only the electric motor is driving, the internal combustion engine can be started in that the clutch disposed between the internal combustion engine and the electric motor is closed. According to the invention, when the electric motor is operated in motor-braking mode in an exclusively electric motor drive mode, and a desired transition from motor-braking mode into traction mode is derived from a determined torque desired by the driver, the internal combustion engine is started, using the shift from braking to traction mode, in that the clutch disposed between the internal combustion engine and the electric motor is closed at least partially, such that said clutch transmits a torque required for starting the internal combustion engine.

Starter and accessory drive system and method for hybrid drive vehicles

Abstract: A starter and accessory drive system and method for hybrid drive vehicles is provided. The invention isolates the accessory drive system from the transfer of torque between a starter motor and the crankshaft of the engine. In one embodiment, a dedicated flexible drive member transfers torque from the starter motor to the crankshaft to re-start the engine. In another embodiment, a torque transfer control is employed to selectively apply torque from the starter motor to the accessory drive, to drive the accessories when the engine is stopped, and/or to the engine crankshaft to re-start the engine. In another embodiment of the invention, the accessory drive is isolated from the engine crankshaft and is instead driven by a drive motor on the accessory drive while the engine crankshaft is connected to a starter motor and/or generator which can be energized to re-start the engine.

Engine start control system for hybrid vehicle

Abstract: An engine start control system for starting the engine (2) of a hybrid vehicle operated in an EV drive mode. The system responds quickly to an acceleration request while limiting unpleasant deceleration sensations. The hybrid vehicle has a first clutch (3) disposed between the engine (2) and motor/generator (1). An electric drive mode exists in which the first clutch (3) is disengaged and the driving torque is provided only by the motor/generator (1), and a hybrid drive mode exists in which the first clutch (3) is engaged and the driving torque is provided by both the engine (2) and motor/generator (1). The system uses an engine start shift pattern that is high-geared as compared with a normal shift pattern. Shift control of the transmission (5) is performed using the engine start shift pattern when an engine start request arises. The engine (2) is started by controlling the engagement of the first clutch (3) after performing the shift control.

Method and device for operating a hybrid drive of a vehicle

Abstract: The invention relates to a method and a device for operating a hybrid drive (1) of a vehicle, comprising a drive train (2) substantially having an internal combustion engine (3), an electrical machine (5), an activatable clutch (4) by means of which the internal combustion engine (3) can be frictionally connected to the electrical machine (5), and a powershift transmission (7). The aim of the invention is to allow a simple and efficient control of a starting process of the internal combustion engine (3) by means of the electrical machine (5) during shifting and to guarantee a high degree of operating ease of the hybrid drive (1). When the vehicle travels electromotively with the clutch (4) open, in order to start the internal combustion engine (3) by means of the electrical machine (5) during a power shift, the control of the electrical machine (5) to generate a reduced dynamic torque curve (26) at the input of the powershift transmission (7) is replaced by a control of the clutch (4) with a dynamic torque curve (29) that acts on the internal combustion engine (3) and has an inverse value.

Motor drive apparatus, hybrid drive apparatus and method for controlling motor drive apparatus

Abstract: If any short-circuit failure occurs in an inverter, then a motor generator is used to execute a safety driving. If the rotational speed of a motor generator calculated from a detection value of a position sensor exceeds a predetermined reference rotational speed during the safety driving, an MGECU turns on all of the switching elements connected in parallel to a switching element in which a short-circuit failure occurs with respect to a power supply line. If the rotational speed is equal to or less than the reference rotational speed, the MGECU turns on only the switching elements connected in series to the switching element in which the short-circuit failure occurs. In this way, any excessive currents can be prevented from occurring in the inverter without restricting the safety driving.

Comparison of electrical machine types in hybrid drive trains: Induction machine vs. permanent magnet synchronous machine

Abstract: The intention of the present paper is to draw a reasonable comparison of two different types of electrical machines for use in a parallel hybrid drive train: the induction machine with cage rotor on the one hand, the permanent magnet synchronous machine on the other hand. Both machine types have been designed for application in a mild hybrid vehicle. By dint of simulation models and a total vehicle simulation system the machines were compared on their different loss behavior during several driving cycles to find out which one meets the given demands.

Charging strategy providing method for parallel hybrid drive, involves putting down charging and discharging functions for battery in controller, and stopping controller by loading point displacement/movement at engine and electro-machine

Abstract: The method involves putting down different charging and discharging functions for a battery in a controller, where the controller selects one of the different charging or discharging functions in dependence of different input parameters e.g. vehicle speed. The controller is stopped by a loading point displacement/movement at an internal-combustion engine (2) and an electro-machine (3). The input parameters are provided as an actual current difference between an actual state of charge and a target state of charge. An independent claim is also included for a controller for performing a method for providing a charging strategy of a hybrid drive.

Energy management system to improve efficiency of electric and hybrid drive trains

Abstract: A propulsion system is provided that includes an electric drive, a first energy storage system electrically coupled to the electric drive through a direct current (DC) link, and a second energy storage system electrically coupled to the electric drive The propulsion system further includes a multi-channel bi-directional boost converter coupled to the first energy storage system and to the second energy storage system such that the second energy storage system is decouplable from the DC link, wherein the second energy storage system comprises at least one battery coupled in series with at least one ultracapacitor

Method and device for operating a hybrid drive

Abstract: The invention relates to a method for operating a hybrid vehicle, comprising a parallel hybrid drive train (2) having an internal combustion engine (3), at least one electrical machine (5), at least one shift element (4), by means of which the at least one electrical machine (5) and the internal combustion engine (3) can be frictionally connected, a transmission (7) and a power take-off (26), the internal combustion engine (3) being startable from an electromotive driving operation. The aim of the invention is to allow an efficient and reliable driving operation, especially during starting of an internal combustion engine (3) from an electromotive travel, and to meet the requirements of travel comfort and driving dynamics of a person driving such a vehicle as far as possible. The method according to the invention is characterized by variably selecting, once a start demand for starting the internal combustion (3) is given, a starting mode from a group of available starting modes, using an evaluation of defined selection criteria depending on the current operating situation, and by initiating the respective starting mode. A device for carrying out said method comprises operating state detection and storage means (25) that communicate with an operating strategy unit (22) which is used to evaluate a current operating situation when the starting demand for starting the internal combustion engine (3) from an electromotive driving operation is received, and to select a start mode for starting the internal combustion engine (3) from a group of stored starting modes and to initiate it.

Method for operating a hybrid drive of a motor vehicle

Abstract: In a method for operating a hybrid drive of a vehicle having at least one internal combustion engine and at least one first electric machine as drive machines of a first drive train of the vehicle, and an associated first transmission, the total torque of the drive machines is adapted in a shifting operation of the transmission in order to reduce the load at the transmission and/or in order to modify rotational speeds according to the new transmission ratio, and/or the torque gradient of the drive machines is restricted to a specifiable, maximum torque gradient of the resulting total torque of the drive machines of the first drive train in a transition between acceleration operation and trailing throttle operation.

Hybrid drive method and apparatus

Abstract: A method and apparatus that limits the amount of rotating mass in a hybrid drive system that can use an internal combustion engine driving a motor/generator through an electronically controllable clutch. The engine can thus turn the generator to charge a battery. A second clutch can connect this motor/generator to a differential to directly drive the wheels, or to receive braking energy from the wheels. A second electric motor/generator can be coupled directly into the differential so that it can always drive the wheels or recapture braking energy. The two clutch system of the present invention allows several modes: 1) The internal combustion motor drives the generator charging the battery, while the other motor drives the wheels. 2) Both motors drive the wheels. The internal combustion engine can be running or not running. 3) One motor recaptures energy from braking. 4) Both motors recapture energy from braking. 5) The first motor is used to start the engine. In one embodiment of the invention, multiple tandem electric motors can be clutched in and out as needed.

Design and fuel economy of a series hydraulic hybrid vehicle

Abstract: A series hydraulic hybrid drive train for application in a passenger car is described. This ‘Hydrid’ drive train features an in-wheel hydraulic motor in all four wheels, hydraulic transformers for power control and hydraulic-pneumatic accumulators for energy storage and power management. The hydrostatic components are based on the highly efficient floating cup principle. The result is an efficient all-wheel drive vehicle with variable traction control on the front and rear axis. The fuel economy and the CO2-emission of the drive train are calculated for a mid-class sedan while driving the New European Driving Cycle (NEDC). The efficiency of the hydrostatic components is derived from efficiency measurements of the floating cup pump.

System and method to update firmware on a hybrid drive

Abstract: A system, method, and program product is provided that updates the firmware on a hybrid drive by reserving a memory area within the hybrid disk drive's nonvolatile memory buffer. The firmware update is then stored in the reserved memory area. The next time the platters of the hybrid disk drive spin up, the firmware update that is stored in the reserved memory area is identified. The identified update is then written to a firmware memory of a firmware that controls the operation of the hybrid drive. In one embodiment, the update is written to the firmware memory by flashing the firmware's memory. After the firmware is updated, the hybrid drive is reset. Resetting of the hybrid drive includes executing the updated firmware.

Method for Starting a Piston Engine and Hybrid Drive for Performing the Method

Abstract: A method is provided for starting a piston engine of a hybrid drive in an electric travel state. The hybrid drive includes at least the piston engine, an electric motor, a transmission, and a clutch situated between the piston engine and the electric motor. A converter lockup clutch, which is switchable into a slip state, is also provided. A slip is set at the converter lockup clutch, and a speed of the electric motor is then increased. The speed and the torque either do not change or only change in a predefined range at the output side of the converter lockup clutch. The clutch is closed to transmit a torque pulse, so that a first top dead center of the piston of the piston engine may be overcome. A predefined slip is then set at the clutch.

Control apparatus for hybrid drive system

Abstract: A control apparatus for a hybrid drive system including a main drive power source, an electric generator, a wheel-side output shaft, a power distributing mechanism for distributing the drive force of the main drive power source to the electric generator, the wheel-side output shaft and an automatic transmission, and an electric motor connected to the wheel-side output shaft through the automatic transmission, the control apparatus including a motor-output limitation control device for implementing an output limitation of the electric motor according to a requirement for the output limitation, and a motor-output limitation inhibiting device to inhibit the output limitation of the electric motor by the motor-output limitation control device, during a shift-up action of the automatic transmission, or a motor-output increasing device to control the electric motor to increase its output so as to offset the output limitation of the electric motor implemented by the motor-output limitation control device according to a requirement for the output limitation during a shift-up action of the automatic transmission.

Battery for use in motor vehicle e.g. motor vehicle with hybrid drive, has heat contact elements that are attached to heat conducting elements or battery cells in material-cohesive and/or positive-fit and/or force-fit manner

Abstract: The battery has a cell assembly with rectangular flat battery cells (1) and a cooling plate for cooling of cells. Heat conducting elements (2) i.e. heat conducting sheets, are arranged between the cells. Elastic heat contact elements i.e. wave-shaped flat springs (3), thermally connect the cells and the elements (2) with each other. The conducting elements are connected with the plate in a material-cohesive and/or positive-fit and/or force-fit manner. The contact elements are attached to the conducting elements or the cells in a material-cohesive and/or positive-fit and/or force-fit manner.

Control method for optimizing the operation of a hybrid drive system

Abstract: A control apparatus and method are provided for operating a hybrid drive system that can optimize the storage of energy during different operating modes, such as during collection modes and transportation modes of a garbage collection vehicle. Initially, a hybrid drive system is provided for use with a drive train system and/or vehicle that is operable in first and second operating modes. An operating mode parameter of the drive train system and/or vehicle is sensed. Then, the operation of the hybrid drive system is adjusted in response to the operating mode parameter of the drive train system and/or vehicle.

Method for the operation of a drive train

Abstract: A method of operating a drive train comprising a hybrid drive with a combustion engine and an electric motor; a transmission positioned between the hybrid drive and the output; and a clutch positioned between the combustion engine and the electric motor. When the electric motor exclusively drives the vehicle, the combustion engine can be started by engaging the clutch. At the time when the electric motor permanently or without traction force interruption is coupled to the output, and the rotational speed of the electric motor is greater than the starting rotational speed of the combustion engine, and a clutch, positioned between the combustion engine and the electric motor, is engagedly and disengagedly controlled so that the clutch is brought into slippage, via partial engagement, to start the combustion engine, and thereafter the clutch is completely disengaged before reaching a synchronous rotational speed between the combustion engine and the electric motor.

Method for controlling hybrid drive of vehicle, involves operating hybrid drive, which has internal combustion engine and electric motor in braking mode as generator and stores electrical energy in energy storage

Abstract: The method involves operating a hybrid drive, which has an internal combustion engine and an electric motor in the braking mode as a generator and stores electrical energy in an energy storage and is used for the vehicle drive in the drive operation. The functions of the internal combustion engine are controlled and the electric motor is carried out depending on a detected traffic condition or by map information.

Method and device for controlling a creep mode of a vehicle comprising a hybrid drive

Abstract: The invention relates to a method for controlling a creep mode of a vehicle comprising a hybrid drive (1), a drive train (2) which essentially comprises an internal combustion engine (3), an electric machine (5), a gear-shift element (4) arranged between the internal combustion engine (3) and the electric machine (5), a transmission (7) and a power take-off (26). The aim of the invention is to allow an efficient creep mode which is substantially temporally unlimited and reliable and wherein an electrical energy storage device (14) is used as little as possible. The method according to the invention is characterized in that primarily the gear-shift element (4) is used when the internal combustion engine (3) is running and secondarily, depending on a monitoring of defined operation parameters of the gear-shift element (4) and/or of variables relevant for the creep mode, the electric machine (5) is used to implement the creep mode. A device for carrying out the method comprises control and monitoring means (21, 22, 25, 27) which are used for producing a creep torque, taking into consideration an admissible load of the gear-shift element (4), primarily by operating the gear-shift element (4) in a slip mode and secondarily by operating the electric machine (5) in a creep mode.

Method and device for controlling a creep operation of a vehicle with a hybrid drive

Abstract: The invention relates to a method and device for controlling a creep operation of a vehicle with a hybrid drive (1), comprising a parallel hybrid drivetrain (2), with an internal combustion engine (3), at least one electric motor (5), a first switching element (4) in the form of a friction element between the internal combustion engine (3) and the electric motor (5), a gearbox (7), an output (26) and a second switching element (6) arranged between the electric motor (5) and the output (26).According to the invention, a simple, effective and component-friendly continuous creeping can be achieved without additional constructional or economic costs can be achieved, wherein the creeping operation is carried out with the internal combustion engine (3) running and both switching elements (4,6) simultaneously operating with slip, wherein the total operating power required to generate a required creeping torque is variably distributed over both switching elements (4, 6).

Motor vehicle's hybrid drive train controlling method, involves providing hybrid drive train with clutch, and digitally closing and/or opening clutch during attaining synchronous speed range between clutch input and clutch output

Abstract: The method involves providing a hybrid drive train (1) with a clutch (5) that includes a clutch input (6) and a clutch output (7). Electrical power is generated by a generator (9) and used for driving a motor vehicle (2) using an electric machine (11). The clutch is closed in a clutched operating condition and a power flow is transmitted from an internal combustion engine (8) to a gear (10). The clutch is digitally closed and/or opened during attaining synchronous speed range between the clutch input and the clutch output.

Method of operating a hybrid drive system and hybrid drive system with two partial drives

Abstract: A method of operating a hybrid drive system with an internal combustion engine and a supplemental electric machine for a motor vehicle including first and second gear changing partial drives each with gear changing gearwheels, wherein during operation there is torque flow from one gear changing partial drive to the other partial drive results in a gear change between gearwheels.

Control apparatus and method for operating a combined hybrid drive and brake system

Abstract: A combined hybrid drive and brake system for use with a rotatably driven mechanism includes a hybrid drive system that is adapted to decelerate a rotatably driven mechanism, accumulate the energy resulting from such deceleration, and use the accumulated energy to subsequently accelerate the rotatably driven mechanism. A brake system is adapted to decelerate the rotatably driven mechanism. A control apparatus is responsive to a request for braking torque for decelerating the rotatably driven mechanism by either (1) the hybrid drive system operating alone, (2) the brake system operating alone, or (3) both the hybrid drive system and the brake system operating in combination.

Motor drive device and hybrid drive device

Abstract: PROBLEM TO BE SOLVED: To ensure travel at evacuation operation after a failure of a driving circuit to drive and control a motor is detected. SOLUTION: An MG1-ECU detects the failure generated in an inverter 240, based on a malfunction detection signal FINV from a self-protective circuit built in each switching element Q11 to Q16 of the inverter 240, and sends it to a hybrid ECU, When receiving abnormal information of the inverter 240, the hybrid ECU issues instructions to inhibit operations of a first motor generator MG1, a second motor generator, a DC/DC converter and an air-conditioner, then turns off a system relay SMRG and shuts off a power supply route from an energy storage device 140. The hybrid ECU detects defective switching elements due to short circuit, based on the malfunction detection signal FINV which is output from the self-protective circuit when the switching elements Q11 to Q16 are turned on in order. COPYRIGHT: (C)2009,JPO&INPIT

Practical Application of a Hybrid Drive System for Reducing Environmental Load

Abstract: INTRODUCTION HITACHI, LTD. has been developing hybrid drive systems — aiming to reduce environmental load — since 2001. In collaboration with East Japan Railway Company (hereafter referred to as JR East), Hitachi constructed a series hybrid drive system — combining a diesel engine and high-energy-density lithium-ion batteries — and by mounting this system in a test train called “NE Train,” we have performed verifications (such as demonstration of reduction of fuel consumption and assessment of operational lifetime of the rechargeable battery) aimed at practical application of the system on commercial trains. In the present work, utilizing the results obtained with the NE Train, we accepted an order for, and subsequently manufactured, a “hybrid drive system for the Kiha E200 DEMU (diesel electric multiple unit)” from JR East (see Fig. 1). This report describes the hybrid drive system for OVERVIEW: As part of our efforts to address energy and environmental issues, Hitachi, Ltd. is actively involved in reduction of energy consumption by means of compactization, improving efficiency of equipment, and regenerative braking. However, as for DMUs running in non-electrified regions, on top of the fact that regenerative braking cannot be applied as a system for direct drive by diesel engine, reduction of NOx and CO2 gases contained in exhaust is a challenge. Accordingly, we have practically applied a hybrid drive system that can reduce environmental load by means of applying secondary batteries to store regenerative energy and by running the engine at maximum rotational frequency (at which efficiency is high) and switching to electrical energy. What’s more, as technical expansion applying rechargeable batteries, we have developed (1) a diesel high-speedtrain hybrid system (planned to be deployed on long-distance high speed railways) and (2) a battery-type sequential regenerative system (for realizing stable performance and low energy consumption in regards to electric-trainuse drive systems).