Electronic Control Device for a Braking System, Suitable for a Distance Control System
First Claim
1. An electronic control device comprising a controller which carries out a pressure control operation in a motor vehicle braking system by adjusting electric current driving solenoid valves for pressure control via an actuating electronic system, the solenoid valves including at least one wheel brake circuit isolating valve, at least one wheel brake pressure inlet valve, and at least one wheel brake pressure outlet valve, pump assembly is actuated as a function of a pressure request, the pump assembly generates a volumetric flow of hydraulic brake fluid with a periodically fluctuating amplitude, the wheel brake circuit isolating valve, during an active pressure build-up phase, discharges part of the delivery volume of the hydraulic brake fluid in a metered manner into a reservoir volume, in the case of a control operation which performs an intervention for driving stability which is not critical to safety, if the fluid pressure which is built up by the pump assembly is higher than a predetermined pressure, the electric current for the actuation of the isolating valve is modulated periodically, the cycle of the modulation corresponding to a major cycle of the volumetric or pressure fluctuation which is caused by the pump assembly, and the periodic modulation of the isolating valve is interrupted at least when the control device has to carry out an intervention for driving stability which is critical to safety.
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Accused Products
Abstract
An electronic control device for a pressure controller, by way of which solenoid valves for pressure control are actuated with current via an actuating electronic system, and having a pump assembly is actuated as a function of a pressure request, which generates a volumetric flow with a periodically fluctuating amplitude. The wheel brake circuit isolating valve, during an active pressure build-up, discharging part of the delivery volume into a reservoir volume, at least in the case of a control operation which performs an intervention for driving stability which is not critical to safety, if the pressure which is built up by the assembly is higher than the pressure which is to be set, the electric coil current for the actuation of the isolating valve is modulated and the periodic actuation being interrupted at least when the control device has to carry out an intervention for driving stability which is critical to safety.
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Citations
9 Claims
- 1. An electronic control device comprising a controller which carries out a pressure control operation in a motor vehicle braking system by adjusting electric current driving solenoid valves for pressure control via an actuating electronic system, the solenoid valves including at least one wheel brake circuit isolating valve, at least one wheel brake pressure inlet valve, and at least one wheel brake pressure outlet valve, pump assembly is actuated as a function of a pressure request, the pump assembly generates a volumetric flow of hydraulic brake fluid with a periodically fluctuating amplitude, the wheel brake circuit isolating valve, during an active pressure build-up phase, discharges part of the delivery volume of the hydraulic brake fluid in a metered manner into a reservoir volume, in the case of a control operation which performs an intervention for driving stability which is not critical to safety, if the fluid pressure which is built up by the pump assembly is higher than a predetermined pressure, the electric current for the actuation of the isolating valve is modulated periodically, the cycle of the modulation corresponding to a major cycle of the volumetric or pressure fluctuation which is caused by the pump assembly, and the periodic modulation of the isolating valve is interrupted at least when the control device has to carry out an intervention for driving stability which is critical to safety.
Specification