Regenerative braking can save energy consumption greatly for electric vehicles. For a series regenerative brake system, it is foundational to make the hydraulic braking torque and braking force dec...

Braking force decoupling control without pressure sensor for a novel series regenerative brake system

A hybrid vehicle powertrain is configured to provide a regenerative-braking torque limit on a transmission during a regenerative-braking downshift. The regenerative-braking downshift event has sequential boost, start, torque, inertia, and end phases. The transmission may be operated in absence of a regenerative-braking torque limit during the boost and start phases to recapture more energy. The transmission may be operated with a regenerative-braking torque limit during the torque and inertia phases to protect for an input shaft speed dip that may occur without the limit. The limit may be removed once the regenerative-braking downshift event is completed.

Regenerative-braking transmission downshift torque limiting

A method of controlling a mode transition of a hybrid vehicle includes determining whether a mode transition from a first mode to a second mode is required based on a first torque, the first torque being a current required torque. A second torque, which is a required torque expected to be generated at a near-future time from a current time, is also determined. A predicted gear shift time point and a predicted engagement time point of an engine clutch are determined based on the second torque. The mode transition to the second mode is performed when it is determined that the mode transition to the second mode is required and the predicted engagement time point is earlier than the predicted gear shift time point.

Hybrid vehicle and method of controlling mode transition

A method of controlling a vehicle with a hybrid powertrain with an engine and a motor/generator includes monitoring net axle torque on the drive axle, monitoring vehicle deceleration rate, monitoring vehicle speed, and controlling the motor/generator to stop rotation of the engine crankshaft when the vehicle speed is non-zero and below a predetermined vehicle speed auto-stop enable threshold if torque percentage braking torque is greater than a predetermined percentage braking torque and the vehicle deceleration rate is greater than a predetermined threshold vehicle deceleration rate. A hybrid vehicle has a controller with a processor that executes a stored algorithm to carry out the method.

Hybrid vehicle and method of controlling same for engine auto-stop at non-zero vehicle speed

A vehicle control apparatus is a vehicle control apparatus controlling a vehicle (1) and provided with a regenerative device (11) generating electric power while applying a regenerative braking force by performing regenerative electric power generation, an electric power supply (13) capable of exchanging electric power with the regenerative device, and a hydraulic device (15) applying a hydraulic braking force attributable to a hydraulic pressure, and is provided with an electronic control device (19) controlling the regenerative device (11, 12) and the hydraulic device (15) so as to adjust the ratios (r1, r2) of the regenerative braking force (Tr1) and the hydraulic braking force (Tr2) to a required braking force (Tr0) required for the braking of the vehicle (1) based on an input electric power value (Pin) input into the electric power supply (13).

A vehicle control apparatus for a regenerative braking system based on the battery imput power

A vehicle includes a powertrain having an electric machine configured to selectively apply regenerative torque to cause deceleration in response to braking demand; the powertrain further including a torque converter configured to decouple the electric machine from wheels of the vehicle. The vehicle is also provided with a controller programmed to, during a regenerative braking event, receive a signal defining a regenerative torque limit, and in response to a fault condition associated with the regenerative torque limit, generate a replacement regenerative torque limit based upon a torque converter open speed to decrease roughness during transitions into and out of regenerative braking.

Hybrid vehicle braking limit determination system and method

A vehicle includes a powertrain having an electric machine, and friction brakes configured to resist rotation of a vehicle wheel. The further includes at least one controller programmed to (i) issue a command for the electric machine to apply a regenerative torque to decelerate the vehicle in response to driver braking demand, and (ii) cause both a decay in the regenerative torque and a countervailing increase in the resistance of the friction brakes when vehicle speed is reduced to less than a first threshold such that braking demand is substantially satisfied by only the friction brakes when the vehicle speed is less than a second threshold.

Hybrid vehicle braking system and method

A method for controlling vehicle regenerative braking includes decreasing regenerative braking, provided a converter clutch is locked, such that regenerative braking torque reaches zero before a converter clutch opens due to vehicle speed reaching a reference speed; decreasing regenerative braking, provided the converter clutch is scheduled to open, such that regenerative braking torque reaches zero before the converter clutch opens due to vehicle speed reaching the reference speed; and braking the vehicle using wheel brakes.

Regenerative braking and torque converter control

Methods and systems are provided for operating a driveline of a hybrid vehicle that includes an internal combustion engine, a rear drive unit electric machine, an integrated starter/generator, and a transmission are described. In one example, charging of an electric energy storage device may be allocated between the rear drive unit electric machine and the integrated starter/generator to increase charge stored in the electric energy storage device.

Zhao Yanan

Papers

Hybrid vehicle braking limit determination system and method

Regenerative-braking transmission downshift torque limiting

Hybrid vehicle braking system and method

Regenerative braking and torque converter control

Methods and system for a hybrid vehicle