In the vehicle of the invention, when the driver releases a depressed accelerator pedal, the drive control sets a vehicle speed V at the moment to a target vehicle speed V* (step S440). An engine and a motor for outputting driving power are controlled to drive the vehicle at the target vehicle speed V*. When the driver steps on a released brake pedal, the drive control stores the target vehicle speed V* set before the driver's depression of the brake pedal as a previous target vehicle speed Vpre and cancels the setting of the target vehicle speed V* (steps S470 and S480). In response to the driver's subsequent release of the brake pedal, the drive control sets the vehicle speed V at the moment to the target vehicle speed V* (step S510) and restarts constant-speed drive (cruise drive). When the driver turns a steering wheel to or over a preset degree for a left turn or a right turn, the drive control sets the previous target vehicle speed Vpre to the target vehicle speed V* (step S520) and restarts the constant-speed drive. This arrangement ensures easy and quick start of the constant-speed drive (cruise drive) and enables the constant-speed drive (cruise drive) according to the variation of the driving state.

Vehicle and control method of vehicle

A multivariate control method and system to control torque output from a powertrain system to a driveline is provided, to reduce driveline oscillations. The powertrain preferably comprises hybrid powertrain having a plurality of torque-generative devices connected to a transmission. Desired powertrain and driveline operating states are determined, as are a plurality of operating state errors. Each torque-generative device is controlled, based upon the operating state errors, and operating mode of the transmission. A damping torque command, additive to a commanded torque, is determined for one or more of the torque-generative devices based upon the determined transmission operating mode. Determined operating states include operator input, and powertrain/driveline including driveline torque; transmission input torque, rotational speed of the torque-generative devices; road load; and, accessory load.

Method and apparatus for multivariate active driveline damping

One embodiment relates to a hybrid vehicle drive system for a vehicle including a first prime mover, a first prime mover driven transmission, a rechargeable power source, and a PTO. The hybrid vehicle drive system further includes a hydraulic motor in direct or indirect mechanical communication with the PTO and an electric motor in direct or indirect mechanical communication with the hydraulic motor. The electric motor can provide power to the prime mover driven transmission and receive power from the prime mover driven transmission through the PTO. The hydraulic motor can provide power to the prime mover driven transmission and receive power from the prime mover driven transmission through the PTO.

Hybrid vehicle drive system and method and idle reduction system and method

An engine and a second power generating device transmit power through a transmission to a driveline to a wheel. A control module determines a regenerative braking axle torque capacity and a regenerative braking torque. Power output from the second power generating device is controlled based upon a regenerative braking axle torque request. A brake control module determines a total braking torque request and generates the regenerative braking axle torque request based upon the total braking torque request, the regenerative braking axle torque capacity, and the regenerative braking torque. The brake control module controls a friction brake.

System architecture for a blended braking system in a hybrid powertrain system

A method of testing an electric motor that is adapted to provide a desired electric motor output torque to a vehicle powertrain system comprising an engine and the electric motor which are operatively and selectively coupled to a transmission. The method includes the steps of determining an initial motor speed of the electric motor, determining a motor torque command as a function of the initial motor speed, applying the motor torque command to the electric motor to produce an output torque from the electric motor, measuring a resultant motor speed of the electric motor and establishing a motor status as a function of the resultant motor speed. The method may be implemented as a computer control and diagnostic algorithm.

Method of testing motor torque integrity in a hybrid electric vehicle

A system and method for actively damping driveline oscillations in a motor vehicle having a traction motor to drive a vehicle's drive wheels and an antilock brake system (ABS). A traction motor controller controls a torque output signal of the motor to effectively to dampen driveline oscillations during an ABS operation. A proportional, a proportional derivative, or a derivative controller may be used to generate the torque output signal based on at least one of motor speed, an average of the drive wheel speeds, a difference in the two speeds, a motor angular acceleration, an average wheel angular acceleration, and a difference in the angular accelerations. Motor speed signals and average drive wheel speed signals may be filtered to eliminate high frequency components of each speed signal. Additionally, amplitude of the torque output signal may be limited within a positive upper and a negative lower active motor damping limit.

Active motor damping to mitigate electric vehicle driveline oscillations

The present invention is a method and system to control regenerative braking during the operation of a yaw stability control system. The method and system use feedback control algorithms to monitor and dynamically modify regenerative and non-regenerative braking. The controller can use a simple proportional-integral-derivative feedback controller. A vehicle yaw stability control system can determine if a vehicle is experiencing an oversteer or understeer condition. The controller compares actual brake balance to a desired brake balance. The controller determines if the front axle wheels are overbraked relative to the rear axle wheels or if the rear axle wheels are overbraked relative to the front axle wheels as compared to the desired brake balance. The controller can adjust regenerative braking and non-regenerative braking levels according to the determinations.

Control of regenerative braking during a yaw stability control event

A system and method for maximizing the post-ABS regenerative braking capability of an automotive vehicle having regenerative braking available for more than one axle determines the availability of surplus regenerative braking capacity on a first axle and then uses the surplus, if any, to satisfy the brake demand for another axle having insufficient regenerative braking capacity. This system restores regenerative braking without causing the regenerative braking to trigger a subsequent ABS event.

Method for operating multiple axle regenerative braking in an automotive vehicle

A method and apparatus for providing regenerative and friction braking on a vehicle having one or more wheels driven by a drive motor includes a master cylinder (28), a hydraulic control unit (30), a brake control unit (38), a drive motor control unit (52) and a drive motor (18). The drive motor control unit determines a coast down regenerative torque signal in response to an acceleration signal and a driver brake command regenerative torque signal in response to a pressure signal and a drive motor deceleration signal and commands the drive motor to regeneratively brake the driven left and right wheels in response thereto, thereby providing a desirable proportioning of front to rear braking.

Method and apparatus for regenerative and friction braking

Die
Erfindung betrifft eine Vorrichtung und ein Verfahren zum aktiven
Dampfen
von Schwingungen im Antriebsstrang (10) eines Kraftfahrzeuges, welches
einen Fahrmotor (12) zum Antreiben von Antriebsradern (18, 20) des Fahrzeugs
und ein Antiblockierbremssystem (ABS) aufweist. Eine Fahrmotorsteuerung
steuert ein Drehmomentausgangssignal des Motors, um Antriebsstrangschwingungen
wahrend
einer ABS-Betatigung
effektiv zu dampfen.
Ein Proportional-Regler, ein Proportional-Differential-Regler oder
ein Differential-Regler konnen verwendet
werden, um das Drehmomentausgangssignal, basierend auf wenigstens
einer der Grosen Motordrehzahl, Mittelwert
der Antriebsraddrehzahlen, Differenz der beiden Drehzahlen, Motorwinkelbeschleunigung,
mittlere Radwinkelbeschleunigung und Differenz der Winkelbeschleunigungen,
zu erzeugen. Die Motordrehzahlsignale und die mittlere Antriebsraddrehzahlsignale
konnen
gefiltert werden, um Hochfrequenzkomponenten jedes Drehzahlsignals
zu eliminieren. Zusatzlich
kann die Amplitude des Drehmomentausgangssignals zwischen einem
positiven oberen Grenzwert und einem negativen unteren Grenzwert der
aktiven Motordampfung
begrenzt sein.

Michael John Schneider

Papers

Active motor damping to mitigate electric vehicle driveline oscillations

Control of regenerative braking during a yaw stability control event

Method for operating multiple axle regenerative braking in an automotive vehicle

Method and apparatus for regenerative and friction braking

Verfahren zur Abdämpfung von Schwingungen im Antriebsstrang eines Elektrofahrzeugs