Method for improving the regulatory behaviour of motor vehicle regulatory systems

• US 20050171671A1
• Filed: 04/02/2003
• Published: 08/04/2005
• Est. Priority Date: 04/03/2002
• Status: Active Grant

• Current Assignee: Continental Teves AG & Co. OHG (Continental AG)
• Original Assignee: Continental Teves AG & Co. OHG (Continental AG)
• Inventors: Gronau, Ralph, Woywod, Jurgen
• Granted Patent: US 7,174,247 B2
• Time in Patent Office: Days
• US Class Current: 701/70
• CPC Class Codes: B60T 8/4045 involving ON/OFF switching
• CPC Class Codes: B60T 8/4291 having means to reduce or eliminate pedal kick-back

Abstract

The invention relates to a method for improving the control behavior of motor vehicle control systems such as ABS, ESP, etc. comprising electrically driven hydraulic pumps, inlet and outlet valves and low-pressure accumulators, wherein the low-pressure accumulators accommodate, at least in part, pressure fluid that is discharged from wheel brakes in a control operation, wherein the hydraulic pumps are used to return the pressure fluid into a master cylinder, in particular tandem master cylinder, wherein the delivery behavior of the hydraulic pumps is controlled in dependence on pressure values, wherein the actuation of the hydraulic pumps takes place in conformity with demand, i.e. by evaluating slip variation, wherein in a pressure increase phase, the pressure fluid is intermediately stored in the low-pressure accumulators and there is no return delivery of the pressure fluid into the master cylinder until either a pressure increase phase or pressure buildup commences, or a critical filling level of the low-pressure accumulator necessitates actuation of the hydraulic pumps for safety reasons, with the result of balancing the volume flow demand and the delivery volume flow and thus achieving a reduction of vibrations of the brake pedal. Further, the invention relates to a computer program product defining an algorithm that comprises a method for improving the control behavior of motor vehicle control systems.

Claims

1-6. -6. (canceled)

7. Method for improving the control behavior of motor vehicle control systems such as ABS, ESP, etc. comprising electrically driven hydraulic pumps, inlet and outlet valves and low-pressure accumulators, wherein the low-pressure accumulators accommodate, at least in part, pressure fluid that is discharged from wheel brakes in a control operation, wherein the hydraulic pumps are used to return the pressure fluid into a master cylinder, in particular tandem master cylinder, wherein the delivery behavior of the hydraulic pumps is controlled in dependence on pressure values, and wherein the actuation of the hydraulic pumps takes place in conformity with demand, i.e. by evaluating slip variation,

wherein in a pressure increase phase, the pressure fluid is intermediately stored in the low-pressure accumulators and there is no return delivery of the pressure fluid into the master cylinder until either a pressure increase phase commences, or a critical filling level of the low-pressure accumulator necessitates actuation of the hydraulic pumps for safety reasons, with the result of balancing the volume flow demand and the delivery volume flow and thus achieving a reduction of vibrations of the brake pedal.

8. Method as claimed in claim 7,

wherein a measured pilot pressure of a brake pedal is used as a pressure value.

9. Method as claimed in claim 7,

wherein the pressure value is a pressure value calculated by producing a model from values acquired on the basis of the valve actuation, the control variation etc.

10. Method as claimed in claim 7,

wherein the critical filling level of the low-pressure accumulator is fixed in response to vehicle-related conditions such as the variation of slip, wheel acceleration, pilot pressure, locking pressure level, etc., in particular by means of characteristic curves.

11. Method as claimed in claim 7,

wherein in a pressure increase phase, the pressure fluid is returned by means of the hydraulic pumps from the low-pressure accumulators into the master cylinder in such a fashion that the volume flow demand of the wheel brake is provided to the greatest possible extent by the delivery volume flow of the hydraulic pump so that pedal movements due to volume flow differences are greatly minimized.

12. Method as claimed in claim 7,

wherein the volume flow demand of the wheel brake is stored in the form of volume characteristic curves.

13. Method as claimed in claim 7,

wherein the hydraulic pump is actuated in response to the volume characteristic curves.

14. Computer program product,

wherein said product defines an algorithm comprising a method as claimed in claim 7.