Method for adjusting brake pressures of a motor vehicle, brake system for carrying out the method and motor vehicle comprising such a brake system
First Claim
1. A method for generating brake pressures at pneumatically operated wheel brakes of a motor vehicle, the method comprising:
- generating, in a normal braking mode, first brake pressures at the pneumatically operated wheel brakes of the motor vehicle in response to reception of a first driver brake request;
determining, in the normal braking mode, a braking power index that relates a first driver target deceleration value corresponding to the first driver brake request and an actual deceleration value of a vehicle deceleration; and
generating, by a control unit in a pressure control mode, second brake pressures at the pneumatically operated wheel brakes of the motor vehiclewherein the second brake pressures are generated in response to reception of an external brake request and a second driver brake request,wherein the external brake request is defined for the control unit as an external target deceleration value and is independent of the second driver brake request,wherein the second brake pressures are generated as a function of a resulting target deceleration value of the vehicle deceleration,wherein the resulting target deceleration value is determined by linking, by the control unit, the external target deceleration value and a second driver target deceleration value corresponding to the second driver brake request, andwherein the second driver target deceleration value is determined according to the braking power index.
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Accused Products
Abstract
A method for adjusting brake pressures on pneumatically operated wheel brakes of a motor vehicle includes adjusting, in a normal braking mode, the brake pressures depending on a driver brake request; and adjusting, by a control unit in a pressure control mode, the brake pressures at the respective wheel brakes during reception of an external brake request, which is independent of the driver brake request and defined for the control unit as an external target deceleration value, as a function of a resulting target deceleration value of the vehicle deceleration. The control unit determines the resulting target deceleration value by linking the external target deceleration value according to the external brake request and a value corresponding to the driver brake request. A braking power index is determined which quantitatively represents the braking effect of the wheel brakes, and is provided to be taken into account in pressure control mode.
32 Citations
20 Claims
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1. A method for generating brake pressures at pneumatically operated wheel brakes of a motor vehicle, the method comprising:
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generating, in a normal braking mode, first brake pressures at the pneumatically operated wheel brakes of the motor vehicle in response to reception of a first driver brake request; determining, in the normal braking mode, a braking power index that relates a first driver target deceleration value corresponding to the first driver brake request and an actual deceleration value of a vehicle deceleration; and generating, by a control unit in a pressure control mode, second brake pressures at the pneumatically operated wheel brakes of the motor vehicle wherein the second brake pressures are generated in response to reception of an external brake request and a second driver brake request, wherein the external brake request is defined for the control unit as an external target deceleration value and is independent of the second driver brake request, wherein the second brake pressures are generated as a function of a resulting target deceleration value of the vehicle deceleration, wherein the resulting target deceleration value is determined by linking, by the control unit, the external target deceleration value and a second driver target deceleration value corresponding to the second driver brake request, and wherein the second driver target deceleration value is determined according to the braking power index. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 18)
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13. A brake system for generating brake pressures at pneumatically operated wheel brakes of a motor vehicle, the brake system comprising:
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a control unit configured to control, for each pneumatically operated wheel brake, a pressure control valve; a brake cylinder for each pneumatically operated wheel brake; a service brake valve configured to be actuated by a driver of the motor vehicle; and a brake signal emitter; wherein, in a normal braking mode, brake pressures in each brake cylinder are configured to be set depending on actuation of the service brake valve by the driver, wherein, in a pressure control mode, the brake pressures in each brake cylinder are configured to be set by the control unit via each respective pressure control valve, wherein the control unit has a detector configured to detect an actual deceleration value, wherein the control unit is configured to determine, in the normal braking mode, a braking power index that relates a first driver target deceleration value corresponding to the first driver brake request and the detected actual deceleration value of a vehicle deceleration, wherein the control unit is configured to generate, in the pressure control mode, the brake pressures in each brake cylinder as a function of a resulting target deceleration value of the vehicle deceleration and in response to reception of an external brake request and a driver brake request, wherein the external brake request is defined for the control unit as an external target deceleration value and is independent of the driver brake request, wherein the resulting target deceleration value is determined by linking, by the control unit, the external target deceleration value and a driver target deceleration value corresponding to the driver brake request, and wherein the driver target deceleration value is determined according to the braking power index. - View Dependent Claims (14, 15, 16, 17, 19)
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20. A method for generating brake pressures at pneumatically operated wheel brakes of a motor vehicle, the method comprising:
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generating, in a normal braking mode, first brake pressures at the pneumatically operated wheel brakes of the motor vehicle in response to reception of a first driver brake request; determining, in the normal braking mode, a braking power index that relates a first driver target deceleration value corresponding to the first driver brake request and an actual deceleration value of a vehicle deceleration; and generating, by a control unit in a pressure control mode, second brake pressures at the pneumatically operated wheel brakes of the motor vehicle wherein the second brake pressures are generated in response to reception of an external brake request and a second driver brake request, wherein the external brake request is defined for the control unit as an external target deceleration value and is independent of the second driver brake request, wherein the second brake pressures are generated as a function of a resulting target deceleration value of the vehicle deceleration, wherein the control unit determines the resulting target deceleration value based on the external target deceleration value and a second driver target deceleration value corresponding to the second driver brake request.
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Specification