Showing papers on "Hybrid drive published in 2005"

Hybrid drive unit

Abstract: A hybrid drive unit includes a three-element planetary gear coupled to two motors, and a reduction planetary gear which is drivingly connected to the three-element planetary gear and switches modes by controlling a clutch and a brake. A three-element direct drive mode is able to be achieved by providing another clutch which couples together any two elements of the reduction planetary gear, and locking up the reduction planetary gear. As a result, motor output is reduced compared with a four-element direct drive mode of related art during high-speed running, and energy recovery efficiency during regeneration can also be improved.

Hybrid drive system wherein clutch is engaged when engine speed has exceeded motor speed upon switching from motor drive mode to engine drive mode

Abstract: A hybrid vehicle drive system including (a) an engine, (b) an electric motor, (c) a planetary gear device having a first rotary element connected to the engine, a second rotary element connected to the electric motor and connected through a first clutch to an output member connected to vehicle drive wheel, and a third rotary element connected through a second clutch to the output member, (d) a forward-motor-drive control device for engaging the first clutch and releasing the second clutch to thereby establish a forward motor drive mode in which the vehicle is driven in a forward direction by the electric motor, (e) a forward-engine-drive control device for engaging at least the second clutch to establish an engine-drive mode in which the vehicle is driven in the forward direction by the engine, and (f) a second-clutch control device operable upon switching of a vehicle drive mode from the forward motor drive mode to the forward engine drive mode, for engaging the second clutch only after the engine speed has exceeded the motor speed.

Hydro-Electric Hybrid Drive System For Motor Vehicle

Abstract: A hybrid electro-hydraulic drive system is provided for a vehicle and comprises a hydraulic transmission including a first hydraulic machine and at least one second hydraulic machine drivingly connected to drive wheels of the motor vehicle for driving thereof, an electric motor/generator operatively connected to the first hydraulic machine, and at least one energy storage device operable to store and release a hydraulic fluid energy or an electrical energy. The second hydraulic machine is a reversible hydraulic pump/motor unit capable to function both as a hydraulic pump and a hydraulic motor. The energy storage device is operatively connected to either the hydraulic transmission or the electric motor/generator. In a retarding mode the hydraulic transmission and/or the electric motor/generator retard the vehicle, while in a driving mode they supply a supplementary power to the drive wheels to assist propulsion of the vehicle.

Hybrid drive unit for vehicles

Abstract: A hybrid drive unit for vehicles, in which a power distribution device is arranged in a power transmission route between an engine and a wheel, in which the power distribution device has a first to fourth rotary elements capable of rotating differentially with one another, in which a first motor generator is connected to the second rotary element and a wheel is connected to the fourth rotary element, and which is capable of steplessly controlling a speed change ratio of the first rotary element and the fourth rotary element of the power distribution device comprising: a second motor generator connected to the third rotary element of the power distribution device; a third motor generator connected to the wheel in a power transmittable manner; and an electric circuit for allowing exchange of electric power among individual motor generators.

Drive unit for motor vehicles with hybrid drive in a longitudinal arrangement

Abstract: The invention relates to a drive unit for motor vehicles with hybrid drive and a drive train in a longitudinal arrangement, between the internal combustion engine and the first axle (7*), comprising a housing piece, a through driveshaft (4), an electric motor (11, 13), surrounding the through driveshaft with a first clutch (3) before the electric motor and a second clutch (5) thereafter, whereby a second axle (17*) is also to be driven with minimal space requirement. A first electric motor (11) is thus physically combined with the first clutch (3), surrounding a second electric motor (13) and the through driveshaft (60) and is connected to the second axle (17*) by means of a third clutch (14), an offset gear (15) and a shaft (16).

Hybrid drive system with double clutch

Abstract: The transmission has a twin-clutch arrangement (2) including two clutches (3, 4) and an input side for connecting the twin-clutch arrangement to an engine. One input shaft is connectable to the engine via one clutch and another input shaft is connectable to the engine via another clutch. A drive unit is connected to the input side of the twin-clutch arrangement and another drive unit is connected to one of the input shafts or to an output shaft. An independent claim is also included for a method for controlling a twin-clutch transmission.

Hydraulic hybrid drive system

Abstract: A hybrid hydraulic drive system for a vehicle comprises a prime mover, a transmission connecting the prime mover to drive wheels, a fluid energy storage accumulator, and a reversible hydraulic machine in fluid communication with the energy storage accumulator and drivingly coupled to the prime mover upstream of the transmission. The hybrid hydraulic drive system is arranged such that in a retarding mode the reversible hydraulic machine retards the drive wheels of the vehicle by pumping fluid into the accumulator. In a driving mode the reversible hydraulic machine supplies a supplementary power to the drive wheels of the vehicle using the pressurized fluid from the accumulator to assist propulsion of the vehicle. In a neutral mode the reversible hydraulic machine is disconnected from the prime mover to render the reversible hydraulic machine substantially inoperative to exert any significant driving or retarding influence on the drive wheels.

Hybrid Utility Vehicle

Abstract: A serial hybrid drive system for off-road utility vehicles and/or riding tractors including one or more electric motors (8, 8a, 8b) for driving the vehicle. The motors are connected to the driven wheels (11), with or without individual gear boxes 9a, 9b) or transmissions, to turn the wheels. The vehicle includes an electric generator (4) connected to the vehicle engine (2) for supplying power to a fast charging battery pack (6), which in turn feeds power to the motors. One or more motors may also be provided for operating accessory implements of the vehicle. These motors and vehicle generator receive operational instructions from one or more controllers (14, 16, 18), which may be programmed to adjust personality settings for the drive system.

Hybrid motor vehicle and method for controlling operation of a hybrid motor vehicle

Abstract: A method controls an operation of a motor vehicle equipped with a hybrid drive unit having a combustion engine and at least one electric machine that can be selectively operated as a motor or as a generator. The electric machine, when in generator mode, charges an energy store and/or supplies power to a vehicle electrical system of the motor vehicle. In generator mode, the electric machine is operated in alternating intervals, while maintaining predefined boundary conditions. In a first interval, the electric machine is operated with a first high electrical power output that is higher than an actual power consumption of the vehicle electrical system of the motor vehicle. The electric machine is switched off in a second interval. This largely prevents the electric machine from approaching operating points under light load which have a low efficiency and achieves a fuel advantage in comparison to a continuous operating mode.

Automobile hybrid drive system with common control of converter unit between electrical machine driven by IC engine and electrical energy store and clutches on input and output sides of electrical machine

Abstract: The hybrid drive system uses an IC engine (2) driving an electrical machine (6) which functions as both a generator and an electric motor, an electrical energy store (16) coupled to the electrical machine via a controllable converter unit (14) for control of the electrical energy flow A common control device (18) controls both the converter unit and first and second clutches (4,8) between the IC engine and the electrical machine and between the electrical machine and the converter unit, for starting the IC engine with the second clutch closed, the electrical machine operated with increasing torque or the conversion ratio of the drive transmission (10) reduced during closure of the first clutch

Comparison of hybrid propulsion drive schemes

Abstract: This paper provides a brief overview of a hybrid drives which have become popular in recent years. These drives combine two or more multilevel power inverters to obtain exceptional power quality which is necessary for Naval propulsion applications. Furthermore, for ship propulsion, where it may be difficult to obtain several isolated dc voltage sources, the inverter control can be set so that only one real dc power source is needed (or one per phase in the case of a series H-bridge type). Three types of hybrid drives considered and their advantages and limitations are described. Commonalities of the control of each hybrid drive type is discussed and three control schemes are applied to the various topologies in a set of simulation examples.

Modelling and design of super capacitors as peak power unit for hybrid electric vehicles

Abstract: This paper reports about the design of a peak power unit for hybrid electric vehicles and the modelling of the power control strategy to optimise the drive train's performance. A common DC bus of the hybrid drive train is defined and was provided with a peak power unit using super capacitors, connected via a bi-directional DC/DC converter. This architecture allows a fast load response and a high efficiency of the total electric drive train. An optimised control strategy is needed to ensure an optimal distribution of the power flow between the peak power unit and the main energy source.

Hybrid drive train provided with hub motors

Abstract: A parallel hybrid drive train is provided with an internal combustion engine (ICE) that supplies mechanical power to two driving wheels of a vehicle. Each driving wheel is provided with a respective hub motor having a stator mounted to the vehicle and a rotor directly connected to the driving wheel. The interconnection between the ICE and the driving wheel is done via a cardan joint provided between the output shaft of the ICE and each driving wheel. Accordingly, when the hub motors are energized, the drive train is in a parallel hybrid mode where both the ICE and the hub motors contribute to the rotation of the wheel. The drive train may also be placed in a conventional mode when the hub motors are not energized and in a purely electric mode when the ICE is not running.

Method for Starting an Internal Combustion Engine in a Parallel Hybrid Drive Train

Abstract: The invention relates to a method for starting an internal combustion engine in a parallel hybrid drive train of a motor vehicle. In addition to the internal combustion engine, said drive train comprises an automatic transmission (1) which is provided with a drive shaft (2) that can be connected to the internal combustion engine, at least one output shaft (3) that can be connected to at least one driving axle of the motor vehicle, a mechanical transmission (4) encompassing a first and a second planetary gear set (5, 6), several clutches and brakes, and an electric machine (14) that is used as a starter/generator and/or for continuously adjusting the transmission and/or electrically driving the motor vehicle. The electric machine (14) can be connected to a first and/or a second shaft of the first planetary gear set by means of two of the clutches in such a way that the internal combustion engine can be started by actuating one of the two clutches when the vehicle is driven exclusively in the electric mode and the other clutch is closed, the internal combustion engine being started by closing the clutch (K4) which can be connected directly to the drive shaft (2) by closing the same.

Hybrid drive system e.g. for straddle carrier in seaport or container terminal, uses electronic control device for controlling individual components and units

Abstract: A hybrid drive system has a current generating system (3) with a combustion engine (1), which drives a three-phase current generator (2), which transfers its generated electrical energy to a DC voltage link (4) which transfers the electrical energy via one- or more inverters (6) to the drive lift and auxiliary motors (7-9) and is connected to a static electric energy reservoir (10). An electronic device (15) control the individual components and units and is connected to the DC voltage link (4) and to a further electric energy reservoir, which is designed as a temporary power store (12) and consists of one or more interconnected ultra capacitors (13). An independent claim is also included for a method for operating a hybrid drive system.

Automobile hybrid drive system with common control of converter unit between electrical machine driven by IC engine and electrical energy store and clutches on input and output sides of electrical machine

Abstract: The hybrid drive system uses an IC engine (2) driving an electrical machine (6) which functions as both a generator and an electric motor, an electrical energy store (16) coupled to the electrical machine via a controllable converter unit (14) for control of the electrical energy flow. A common control device (18) controls both the converter unit and first and second clutches (4,8) between the IC engine and the electrical machine and between the electrical machine and the converter unit, for starting the IC engine with the second clutch closed, the electrical machine operated with increasing torque or the conversion ratio of the drive transmission (10) reduced during closure of the first clutch.

Hybrid drive unit cooling controlling method for hybrid vehicle, involves controlling electrical input of coolant pump based on temperature of electrical engine and/or electronic devices formed in engine

Abstract: The method involves pumping a coolant through a cooling circuit (42) using an electrical coolant pump (60). The circuit includes an electrical engine (14) of a hybrid vehicle, and/or electronic devices (24, 34) formed in the engine. An internal combustion engine and a vehicle drive unit e.g. hybrid drive unit, are formed in the vehicle. Electrical input of the pump is controlled based on the temperature of the engine and/or devices. An independent claim is also included for a motor vehicle e.g. hybrid vehicle with an electrical engine and electronic devices formed in the engine.

High temperature electronic for future hybrid powertrain application

Abstract: Hybrid drives can substantially reduce the fuel consumption and the emissions of a motor vehicle and additionally increase the traveling comfort and the driving dynamics. Key components of these drives are an electrical machine and an inverter, which consists of many electronic elements. The electronics have to be operated at moderate temperatures, in order to use the full potential of a hybrid drive. For this reason today the inverter normally is arranged separately from the electrical machine into a separate housing. Advancements of the electronic elements in the last years make solutions tangible, which can also provide high power with high environmental and coolant temperatures and are able to work reliably over the specified life time of a motor vehicle. Furthermore, electronics for high operating temperature make variable mounting spaces possible, so the modularity of the hybrid components can be increased and the systems can be assembled in a more compact manner. In this document the requirements on the electronics and the necessary development for these environmental conditions are described

Analysis of different control strategies and operating modes of compact high planetary transmission drive

Abstract: This paper presents the original compact hybrid planetary transmission drive (CHPTD) as a solution of hybrid drive for urban bus. CHPTD uses only one motor. Planetary gear with two degrees of freedom is directly connected with the motor and internal combustion engine (ICE), which explains its compact construction. The third shaft of planetary gear via differential gear propels traction wheels. The clutch-brake system of CHPTD can reduce the planetary gear degrees of freedom, which permits to obtain three operating modes of hybrid drive system: hybrid, pure electric and pure engine. These operating modes provide possibilities for different bus drive, depending on vehicle starting way, downtown or suburban operations. The flexibility of CHPTD application permits properly adjusting power distribution and splitting power between battery and engine, which is the reason of very efficient driving. CHPTD as a kind of "optimized hybrid drive" consumes significantly less energy (fuel and electricity) than well-known series hybrid drive.

Method of battery adjustment for hybrid drive by modeling and simulation

Abstract: Battery modeling and simulation are most useful for designing storage unit for hybrid drives. The background of battery modeling is to determine electromotive force (EMF) in dynamic way (non-measurement) and internal resistance as the function of state of charge (SOQ). This paper presents how to use battery modeling for simulation in hybrid drives and select the proper operating range of battery SOC according to simulation results. The target of simulation is to compare the performance of different types of battery and to find optimal parameters (battery mass, capacity and voltage) of battery pack for hybrid drive system. The simulation is based on the target function of minimum energy consumption (fuel and electricity).

Vehicular hybrid drive system

Abstract: PROBLEM TO BE SOLVED: To provide a vehicular hybrid drive system capable of securing engine start by a motor generator even if a first clutch fails and securing a required engaging response without the need for a large amount of operating energy of a clutch in starting an engine. SOLUTION: This vehicular hybrid driving system, where a first clutch CL1 is interposed between an engine E and a motor generator GM, starts the engine E using the motor generator MG as a starter motor by engaging the clutch CL1. The first clutch CL includes a normal open clutch CL1o and a normal close clutch CL1c which are parallelly interposed between the engine E and the motor generator MG. COPYRIGHT: (C)2007,JPO&INPIT

The hybridization of a Formula race car

Abstract: Hybrid electric vehicles are advantageous under formula racing rules, when allowed. A series hybrid drive train was installed in a Formula SAE car, using off-the-shelf engine, generator, ultracapacitors, and AC motor drive. A DC-DC converter was developed to charge the ultracapacitors with constant power at varying voltage. A 75 m acceleration run is completed in 6 seconds. This is slower than the predicted 4.2 seconds in part due to tires slipping.

Transmission unit for hybrid drive, comprises starting unit assembled of electric drive and torque converter

Abstract: The starting unit (3) is designed as a hybrid module (42) with a generator to be used as an electric drive (4) and a torque converter (5) with triple gearing. The first shaft (11) can be connected to the input device (E), the second (12) to the output element (A) and also to the input element (E) of the mechanical part (2). The third shaft (13) is joined to the electrically operated unit (4). The electrically driven device (4) is designed as a hollow shaft drive positioned coaxial to the torque converter (5).

Method and apparatus for cooling and lubricating a hybrid transmission

Abstract: A method and apparatus for efficiently cooling and lubricating rotating components in a hybrid transmission is provided. By efficiently managing cooling flow to and between the rotating elements, flow requirements and associated pumping requirements within the drive unit are minimized. In addition, by providing a method for placing the fluid directly on the required components, spin losses associated with component contact with stray oil are reduced. Combined, the reduction in pumping and spin losses create a more efficient drive unit and an overall more efficient hybrid drive system which directly leads to higher fuel economy.

Failsafe unit for hybrid vehicle

Abstract: PROBLEM TO BE SOLVED: To provide a failsafe unit for a hybrid vehicle capable of continuing traveling when power cannot be supplied due to a motor generator fault, by securing power supply to a system from the other power source. SOLUTION: In a hybrid vehicle having an engine E, a motor generator MG and an automatic transmission T/M which constitutes a hybrid drive system, and in which only the motor generator MG acts a role of supplying power to the hybrid drive system, a mechanical oil pump OP1 of which the drive force is the engine E, and an electric oil pump OP2 also having a function as a generator of hydraulic drive are employed as pumps to supply oil pressure to the automatic transmission T/M. COPYRIGHT: (C)2007,JPO&INPIT

Hybrid drive system operating method for hybrid vehicle, involves enhancing fuel-air mixture during engine power requirement and balancing less torque of combustion engine by torque of electric powered machine

Abstract: The method involves enhancing fuel-air mixture that is to be supplied to an internal combustion engine during engine power requirement, where the enhancement is decreased against operation without an electric powered machine. The less torque of the combustion engine is balanced by torque of the machine. The enhancement is decreased in a range from low to center revolutions of the machine. An independent claim is also included for device for execution of a method of operating a hybrid drive system.

Method for controlling an operation of a hybrid motor vehicle and hybrid vehicle

Abstract: The invention relates to a method for controlling an operation of a motor vehicle equipped with a hybrid drive unit (10), which comprises a combustion engine (12) and at least one electric machine (14) that can be operated by a motor or by a generator. This electric machine (14), when in generator mode, charges an energy accumulator (22) and/or supplies power to a vehicle electric system (24) of the motor vehicle. The invention provides that, according to the maintaining of preset boundary conditions, the operation of the electric machine (14) in the generator mode ensues in alternating intervals, whereby: (a) in a first interval, the electric machine (14) is operated with a first high electrical power output that is higher than an actual power consumption of the vehicle electric system (24) of the motor vehicle and; (b) is switched off in a second interval. This enables the starting of light load operating points of the electric machine (14) with low efficiencies to be largely avoided whereby achieving a fuel advantage with regard to a continuous operating mode.

Regulating load condition of energy storage device for vehicle with hybrid drive involves regulating state of charge of energy storage device depending on vehicle's speed of travel

Abstract: The method is applied to a vehicle with a hybrid drive, especially a motor vehicle with an internal combustion engine and at least one electrical machine coupled or able to be coupled to the drive train of the vehicle and involves regulating the state of charge of the energy storage device (28) depending on the vehicle's driving speed. A desired value for the state of charge is reduced with increasing speed of travel. An independent claim is also included for a vehicle with a hybrid drive, especially a motor vehicle.

Controller of hybrid vehicle

Abstract: PROBLEM TO BE SOLVED: To provide a hybrid drive device capable of suppressing the lowering of the acceleration responsiveness of a vehicle when the power of a second drive force source is used in accelerating the vehicle. SOLUTION: This controller of a hybrid vehicle comprises a first drive power source and a second drive power source coupled to wheels so that a power can be transmitted thereto, a power distribution device distributing the power of the first drive force source to the wheels and a rotating device, and a transmission disposed in a route from the second drive force source to the wheels. The controller also comprises preparation control execution means (steps S4, S6, S7, S8, S9, S14, S18, S20) executing a preparation control for changing the state of the transmission in a power transmittable state based on at least one state of the state of a road on which the vehicle travels and the operating state of the vehicle even if transmission control conditions to bring the state of the transmission into the power transmittable state are not established. COPYRIGHT: (C)2005,JPO&NCIPI