Slip-controlled braking system for electrically driven motor vehicles
First Claim
1. A brake system for a motor vehicle comprising:
- friction brakes on wheels of at least one axle of the motor vehicle, 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;
a sensor for detecting activation of a brake pedal of the motor vehicle;
a torque distribution device; and
a wheel slip control device,wherein the sensor is connected to the wheel slip control device and the wheel slip control device calculates braking torque values (Mwheel,req) for each wheel in accordance with a deceleration request (adecel,req) embodied by the activation of the brake pedal,wherein the wheel slip control device is connected to the torque distribution device and the torque distribution device is connected to the friction brake control device and the electric drive control device, andwherein the torque distribution device calculates friction braking requests (Mfric,req) to the friction brake control device and generator braking requests (Mreg,req) to the electric drive control device based on the braking torque values calculated by the wheel slip control device, the generator braking requests being calculated based on a current braking torque on at least one of the wheels, and the friction braking requests being calculated based on the braking torque values calculated by the wheel slip control device and the generator braking requests calculated by the torque distribution device.
1 Assignment
0 Petitions
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.
10 Citations
10 Claims
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1. A brake system for a motor vehicle comprising:
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friction brakes on wheels of at least one axle of the motor vehicle, 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; a sensor for detecting activation of a brake pedal of the motor vehicle; a torque distribution device; and a wheel slip control device, wherein the sensor is connected to the wheel slip control device and the wheel slip control device calculates braking torque values (Mwheel,req) for each wheel in accordance with a deceleration request (adecel,req) embodied by the activation of the brake pedal, wherein the wheel slip control device is connected to the torque distribution device and the torque distribution device is connected to the friction brake control device and the electric drive control device, and wherein the torque distribution device calculates friction braking requests (Mfric,req) to the friction brake control device and generator braking requests (Mreg,req) to the electric drive control device based on the braking torque values calculated by the wheel slip control device, the generator braking requests being calculated based on a current braking torque on at least one of the wheels, and the friction braking requests being calculated based on the braking torque values calculated by the wheel slip control device and the generator braking requests calculated by the torque distribution device. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. A method for controlling a brake system for a motor vehicle, the motor vehicle comprising:
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friction brakes on wheels of at least one axle of the motor vehicle, 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; a sensor for detecting activation of a brake pedal of the motor vehicle, a torque distribution device; and a wheel slip control device, wherein the sensor is connected to the wheel slip control device and the wheel slip control device calculates braking torque values (Mwheel,req) for each wheel in accordance with a deceleration request (adecel,req) embodied by the activation of the brake pedal, wherein the wheel slip control device is connected to the torque distribution device and the torque distribution device is connected to the friction brake control device and the electric drive control device, and wherein the torque distribution device predefines calculates friction braking requests (Mfric,req) to the friction brake control device and generator braking requests (Mreg,req) to the electric drive control device based on the braking torque values calculated by the wheel slip control device, the generator braking requests being calculated based on a current braking torque on at least one of the wheels, and the friction braking requests being calculated based on the braking torque values calculated by the wheel slip control device and the generator braking requests calculated by the torque distribution device, wherein the method comprises; determining a current driving state by a state observer, wherein the current driving state comprises at least the current braking torque on the at least one of the wheels and at least one of two variables of a current wheel speed and a current slip for each individual wheel, determining wheel-specific braking torque values on the basis of the deceleration request taking into account the current driving state, splitting the braking torque values 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)
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Specification