A hybrid electric vehicle having one or more controllers, at least two independently driven electric machines (EMs) that are each coupled to separate drive wheels, and controllers configured to generate a torque split ratio responsive to lateral acceleration and/or unequal friction coefficients detected during braking, and to generate electric power with the motors by regeneratively braking each wheel with unequal torques adjusted by the ratio, such that combined wheel braking torques do not exceed a total braking torque limit for the vehicle. In some configurations, the controller(s) generate the torque split ratio by a predetermined lookup table that maps a plurality of torque split ratios to lateral accelerations, the coefficients, and other parameters. Further arrangements include the controller(s) coupled with sensors that detect wheel slip and yaw rate, and responsive to a braking signal, the controller(s) disengage regenerative braking when the wheel slip and/or vehicle yaw are detected.

Methods and systems are provided for propelling a hybrid electric vehicle under circumstances where a torque degradation event associated with an electric machine that is used for propulsive effort is indicated. In one example, a method may include propelling the vehicle at least in part via a first electric machine that provides torque to front wheels and/or via a second electric machine that provides torque to rear wheels of the vehicle, and continuing to propel the vehicle via adjusting operation of both the first and the second electric machine in response to an indication of a torque degradation event associated with one of the electric machines. In this way, a vehicle shutdown event may be avoided.

A brake control device is applied to a vehicle including a regenerative generator. The brake control device includes a pressure adjustment unit that includes an electric pump and a pressure adjustment valve, and that adjusts adjustment liquid pressure of a pressure adjustment fluid path between the electric pump and the pressure adjustment valve; and a controller that controls the electric pump and the pressure adjustment valve. The controller, before starting a replacement operation to replace a regenerative braking force by the regenerative generator with a friction braking force by the adjustment liquid pressure, performs preceding pressurization to increase the adjustment liquid pressure from “0” and maintain the adjustment liquid pressure at predetermined liquid pressure, and after performing the preceding pressurization, increases the adjustment liquid pressure more than the predetermined liquid pressure by increasing a rotation speed of the electric pump, and then execute the replacement operation.

The invention relates to a method for operating a hydraulic brake system (10) in a motor vehicle with regenerative braking function. In the method, if a generator braking force of an electric machine (50) is present or incipient, a hydraulic connection (80) between a brake cylinder (16) and a wheel brake (28) is opened before a hydraulic fluid is displaced in the direction of the wheel brake (28) by means of the brake cylinder (16). The invention furthermore relates to a hydraulic brake system (10) for a motor vehicle with regenerative braking function, and to a method for controlling a hydraulic brake system (10) with regenerative braking function. The invention also encompasses a computer program product, a control unit and a motor vehicle.

Methods and systems are provided for propelling a hybrid electric vehicle under circumstances where a torque degradation event associated with an electric machine that is used for propulsive effort is indicated. In one example, a method may include propelling the vehicle at least in part via a first electric machine that provides torque to front wheels and/or via a second electric machine that provides torque to rear wheels of the vehicle, and continuing to propel the vehicle via adjusting operation of both the first and the second electric machine in response to an indication of a torque degradation event associated with one of the electric machines. In this way, a vehicle shutdown event may be avoided.

A system and a method for controlling an operation of an autonomous vehicle are provided, in which information regarding front vehicles and surrounding traffic information is received in the autonomous vehicle. A traffic flow of the front vehicles and a time when a traffic light color is changed are estimated through the input information and a maximum vehicle velocity at which the autonomous vehicle is capable of crossing the traffic light is calculated while securing a safety distance from the front vehicle by regenerative braking force to generate an acceleration/deceleration control signal for adjusting a driving velocity. Braking is performed by distributing regenerative braking force and friction braking force of the driving vehicle according to the acceleration/deceleration control signal.

An exemplary braking method includes monitoring for an upcoming deceleration of an electrified vehicle, permitting an amount of regenerative braking if the upcoming deceleration is detected, and reducing the amount of regenerative braking if the upcoming deceleration is not detected.

A method for operating a motor vehicle. At least one electric engine designed for driving the motor vehicle is used to recuperate electric energy. In this case, a travel of the motor vehicle during a period of time lying ahead is taken into account. During the use of at least one electric engine for recuperating the electric energy, it is taken into account whether during a thermal load of the at least one electric engine in the period lying ahead, a reduction of the power that can be output by at least one electric engine is to be expected. The at least one electric engine then recuperates an amount of electric energy during the deceleration of the motor vehicle which is smaller than the amount of electric energy that can be recuperated during the deceleration by the at least one electric engine. The invention relates in addition also to a motor vehicle.

A speed control system to control retardation energy of a vehicle and a method of controlling retardation energy of a vehicle are provided. The system includes an energy storage device configured to absorb and store the retardation energy of the vehicle. The energy storage device includes a power absorption limit determined at least partially by a temperature and a state of charge of the energy storage device. The system further includes a non-energy-storing retarder configured to absorb the retardation energy of the vehicle and a controller configured to route the retardation energy to the energy storage device up to the power absorption limit and route a remaining portion of the retardation energy to the non-energy-storing retarder.

In a method for automatically adjusting the vehicle speed of a vehicle, while the distance to a preceding other vehicle is continuously measured, in order to reduce an initial distance, the vehicle is initially moved, in a drive phase, at a higher vehicle speed and is subsequently decelerated in a braking phase.