Electronic Control Device for a Braking System, Suitable for a Distance Control System

• US 20130026818A1
• Filed: 01/28/2010
• Published: 01/31/2013
• Est. Priority Date: 01/28/2010
• Status: Active Grant

• Current Assignee: Continental Teves AG & Co. OHG (Continental AG)
• Original Assignee: Continental Teves AG & Company HG (Continental AG)
• Inventors: Schmidt, Robert, Bohn, Joachim, Hitzel, Michael
• Granted Patent: US 9,205,819 B2
• Time in Patent Office: Days
• US Class Current: 303/139
• CPC Class Codes: B60T 13/18 with control of pump output delivery , e.g. by distributor valves B60T13/167 takes precedence
• CPC Class Codes: B60T 13/20 with control of pump driving means
• CPC Class Codes: B60T 8/36 including a pilot valve responding to an electromagnetic force
• CPC Class Codes: B60T 8/4059 involving the rate of delivery
• CPC Class Codes: B60T 8/4872 pump-back systems

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.

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.

2. The control device as claimed in claim 1, further comprising in that the modulation is influenced by a signal of a position detection means of the pump assembly.

3. The control device as claimed in claim 1, further comprising in that the cycle for the pressure modulation is derived from the actuating electronic system for the isolating valve.

4. The control device as claimed in claim 1 further comprising in that an electronic evaluation of the plunger position of the isolating valve is performed and the change in the magnetic flux is determined via the induction signal of a current loop in the magnetic circuit of the isolating valve, and the signal oscillations of the induction signal are analyzed in order to determine the movement frequency.

5. The control device as claimed in claim 1 further comprising in that the actuating current of the isolating valve is adjusted by means of a current controller.

6. The control device as claimed in claim 1 further comprising in that the motor current of an electric motor which actuates the pump assembly is modulated in a suitable way while the motor is revolving.

7. The control device as claimed in claim 1 further comprising in that the pump assembly is a reciprocating two-piston type.

8. The control device as claimed in claim 1 further comprising in that the control operation which represents an intervention for driving stability which is not critical to safety is a distance control operation.

9. The control device as claimed in claim 1 further comprising the safety-critical control operation including the control operations of skid control and road handling control.