SLIP-CONTROLLED BRAKING SYSTEM FOR ELECTRICALLY DRIVEN MOTOR VEHICLES
First Claim
1. A brake system for a motor vehicle comprising friction brakes on the wheels of at least one axle, which friction brakes are actuated by a friction brake control device, at least one electric machine which is connected to at least one wheel and is actuated at least at times as a generator by an electric drive control device, means for detecting a deceleration request, and a wheel slip control device, wherein the means for detecting a deceleration request is/are connected to the wheel slip control device which predefines setpoint braking torques (Mwheel,req) for each wheel in accordance with the deceleration request (adecel,req), wherein the wheel slip control device is connected to a torque distribution device which is connected to the friction brake control device and the electric drive control device and predefines friction braking requests (Mfric,req) to the friction brake control device and generator braking requests (Mreg,req) to the electric drive control device.
1 Assignment
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Accused Products
Abstract
A braking system for a motor vehicle, including friction brakes on the wheels of at least one axle, the brakes controlled by a friction brake control device; at least one electric machine connected to at least one wheel and controlled by an electric drive control device; a brake pedal for detecting a deceleration request; a wheel-slip controlling device; and a torque distributing device. The devices for detecting a deceleration request are connected to the wheel-slip controlling device, the wheel-slip controlling device specifying target braking torques for each wheel according to the parameters of the deceleration request. The wheel-slip controlling device connected to a torque distributing device which is connected to the friction brake control device and the electric drive control device and which specifies friction brake requests to the friction brake control device and generator brake requests to the electric drive control device according to the target braking torques.
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Citations
12 Claims
- 1. A brake system for a motor vehicle comprising friction brakes on the wheels of at least one axle, which friction brakes are actuated by a friction brake control device, at least one electric machine which is connected to at least one wheel and is actuated at least at times as a generator by an electric drive control device, means for detecting a deceleration request, and a wheel slip control device, wherein the means for detecting a deceleration request is/are connected to the wheel slip control device which predefines setpoint braking torques (Mwheel,req) for each wheel in accordance with the deceleration request (adecel,req), wherein the wheel slip control device is connected to a torque distribution device which is connected to the friction brake control device and the electric drive control device and predefines friction braking requests (Mfric,req) to the friction brake control device and generator braking requests (Mreg,req) to the electric drive control device.
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8. A method for controlling a brake system for a motor vehicle, comprising friction brakes on the wheels of at least one axle which friction brakes are actuated by a friction brake control device, and at least one electric machine which is connected to at least one wheel and can be operated as a generator, means for detecting a deceleration request, and a wheel slip control device, wherein the senor is connected to the wheel slip control device which predefines setpoint braking torques (Mwheel,req) for each wheel in accordance with the deceleration request (adecel,req), wherein the wheel slip control device is connected to a torque distribution device which is connected to the friction brake control device and the electric drive control device and predefines friction braking requests (Mfric,req) to the friction brake control device and generator braking requests (Mreg,req) to the electric drive control device, the method comprising:
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determining a current driving state by a state observer, wherein the current driving state comprises at least a current braking torque and at least one of two variables of a current wheel speed and a current slip for each individual wheel, determining wheel-specific setpoint braking torques on the basis of a deceleration request taking into account the current driving state, splitting the setpoint braking torques for the individual wheels into friction braking requests and a generator braking request/requests, and activating the friction brakes according to the friction braking requests and operating the electric machine according to the generator braking request/requests. - View Dependent Claims (9, 10, 11)
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Specification