Method for calibrating analog-controlled hydraulic valves and brake system comprising an electronic control and regulating unit in which the method is carried out
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The invention relates to a method for determining a driving characteristic of an analogized or analog-controlled hydraulic valve of a brake system for motor vehicles, comprising hydraulically operatable wheel brakes, in which a brake pressure (pDBE), which is generated with the aid of an electricall
The invention relates to a method for determining a driving characteristic of an analogized or analog-controlled hydraulic valve of a brake system for motor vehicles, comprising hydraulically operatable wheel brakes, in which a brake pressure (pDBE), which is generated with the aid of an electrically controllable, electric-motor-driven (110, 35) driven pressure supply device (101, 5), is conducted to a wheel brake (105a, 105b; 8-11) via an inlet valve (102a, 102b; 6a-d) and can be conducted in particular via an outlet valve (103a, 103b, 7a-d) from the wheel brake into a pressure medium container (104, 4). In order to operate the brake system, the pressure supply device and the inlet valves, and in particular the outlet valves, can be controlled by an electronic control and regulating unit (110, 12), wherein for determining the control characteristic of an analogized or analog-controlled inlet or outlet valve, a brake pressure is generated by the control and regulating unit via the pressure supply device, and the brake pressure (pDBE) is determined by means of a pressure sensor (106, 19) associated with the pressure supply device, and the determined brake pressure and an associated valve control variable (I, U) are stored as a calibration point of the control characteristic (f, F). The invention also relates to a brake system.
대표청구항▼
1. A method for determining a control characteristic of an analogized or analog-controlled hydraulic valve of a brake system for motor vehicles, having hydraulically actuable wheel brakes, the method comprising: passing a brake pressure (pDBE), produced with the aid of an electrically controllable,
1. A method for determining a control characteristic of an analogized or analog-controlled hydraulic valve of a brake system for motor vehicles, having hydraulically actuable wheel brakes, the method comprising: passing a brake pressure (pDBE), produced with the aid of an electrically controllable, electric-motor- driven pressure supply device, via an inlet valve to a wheel brake andpassing the brake pressure (pDBE) out of the wheel brake into a pressure medium reservoir, via an outlet valve,controlling, by an electronic control and regulating unit, the pressure supply device and the inlet valves, and the outlet valves,the control characteristic describing at least one relationship of dependence between an electric valve control variable and a differential pressure (Δp) or pressure (p) present at the valve,producing a brake pressure by the control and regulating unit by the pressure supply device to determine the control characteristic of an analogized or analog-controlled inlet or outlet valve,determining the brake pressure (pDBE) by a pressure sensor associated with the pressure supply device, andstoring the brake pressure (pDBE) determined and an associated valve control variable as a calibration point of the control characteristic in the control and regulating unit,wherein the following steps are carried out to determine the control characteristic of an analogized or analog-controlled outlet or inlet valve of a wheel brake: a) closing the outlet/inlet valve to be calibrated and opening of the associated inlet/outlet valve of the wheel brake,b) building up a predetermined brake pressure value by the pressure supply device and stopping of the electric motor of the pressure supply device,c) changing the valve control variable of the outlet/inlet valve to be calibrated, causing the outlet/inlet valve to be calibrated to open,d) detecting the opening of the outlet/inlet valve to be calibrated by the pressure sensor,e) determining the associated values of the valve control variable and the brake pressure, andf) storing the determined calibration point in the control and regulating unit. 2. The method as claimed in claim 1, wherein regions of the control characteristic, between calibration points, are completed by interpolation or extrapolation or by a model, and the completed control characteristic is stored in the control and regulating unit. 3. The method as claimed in claim 1, wherein the pressure (PVB) is determined in the pressure medium reservoir or is constant or is assumed to be constant. 4. The method as claimed in claim 1, wherein the wheel brakes can be connected via the outlet valves to a pressure medium reservoir under atmospheric pressure. 5. The method as claimed in claim 1, wherein the control characteristic of the analogized or analog-controlled inlet or outlet valve is determined for various volume flows (q) through the valve by determining the control characteristic at various volume flows of the pressure supply device, wherein the volume flow (q) of the pressure supply device is determined by the motor speed of the electric motor of the pressure supply device. 6. The method as claimed in claim 1, wherein at least one wheel brake is connected hydraulically to the pressure supply device during the method steps. 7. The method as claimed in claim 6, wherein a pressure/volume characteristic curve of the wheel brake connected to the pressure supply device is specified or predetermined, and in that the pressure/volume characteristic curve is evaluated in order to detect the opening of the outlet/inlet valve to be calibrated. 8. The method as claimed in claim 1, wherein at least two of i) the brake pressure buildup carried out by the pressure supply device at each of various values of the valve control variable, ii) the change in the valve control variable carried out at each of various brake pressures (PDBE) of the pressure supply device, and iii) the brake pressure buildup by the pressure supply device and a change in the valve control variable are carried out simultaneously. 9. The method as claimed in claim 1, wherein a control characteristic for each analogized or analog-controlled inlet and outlet valve of the brake system is determined in the motor vehicle by the control and regulating unit at the time when the motor vehicle is first put into operation. 10. The method as claimed in claim 1, wherein a control characteristic for each analogized or analog-controlled inlet and outlet valve is determined in the motor vehicle by the control and regulating unit during the time in operation of the brake system if a specified event is present and/or a specified time period has expired. 11. A method for determining a control characteristic of an analogized or analog-controlled hydraulic valve of a brake system for motor vehicles, having hydraulically actuable wheel brakes, the method comprising: passing a brake pressure (pDBE), produced with the aid of an electrically controllable, electric-motor- driven pressure supply device, via an inlet valve to a wheel brake andpassing the brake pressure (pDBE) out of the wheel brake into a pressure medium reservoir, via an outlet valve,controlling, by an electronic control and regulating unit, the pressure supply device and the inlet valves, and the outlet valves,the control characteristic describing at least one relationship of dependence between an electric valve control variable and a differential pressure (Δp) or pressure (p) present at the valve,producing a brake pressure by the control and regulating unit by the pressure supply device to determine the control characteristic of an analogized or analog-controlled inlet or outlet valve,determining the brake pressure (pDBE) by a pressure sensor associated with the pressure supply device, andstoring the brake pressure (pDBE) determined and an associated valve control variable as a calibration point of the control characteristic in the control and regulating unit,wherein the following steps are carried out in order to determine the control characteristic of an analogized or analog-controlled outlet or inlet valve of a wheel brake: closing the outlet/inlet valve to be calibrated and opening of the associated inlet/outlet valve of the wheel brake, wherein, at least one inlet valve of the brake system is opened,building up a brake pressure by the pressure supply device and setting a valve control variable at the outlet/inlet valve to be calibrated, causing the outlet/inlet valve to be calibrated to open,detecting the opening of the outlet/inlet valve to be calibrated by the pressure medium volume (V) output by the pressure supply device,determining the associated values of the valve control variable and the brake pressure, andstoring the determined calibration point in the control and regulating unit. 12. The method as claimed in claim 11, wherein at least one wheel brake is connected hydraulically to the pressure supply device during the method steps. 13. A method for determining a control characteristic of an analogized or analog-controlled hydraulic valve of a brake system for motor vehicles, having hydraulically actuable wheel brakes, the method comprising: passing a brake pressure (pDBE), produced with the aid of an electrically controllable, electric-motor- driven pressure supply device, via an inlet valve to a wheel brake andpassing the brake pressure (pDBE) out of the wheel brake into a pressure medium reservoir, via an outlet valve,controlling, by an electronic control and regulating unit, the pressure supply device and the inlet valves, and the outlet valves,the control characteristic describing at least one relationship of dependence between an electric valve control variable and a differential pressure (Δp) or pressure (p) present at the valve,producing a brake pressure by the control and regulating unit by the pressure supply device to determine the control characteristic of an analogized or analog-controlled inlet or outlet valve,determining the brake pressure (pDBE) by a pressure sensor associated with the pressure supply device, andstoring the brake pressure (pDBE) determined and an associated valve control variable as a calibration point of the control characteristic in the control and regulating unit,wherein the following steps are carried out in order to determine the control characteristic of an analogized or analog-controlled inlet valve: closing of all the inlet valves and opening of at least the outlet valve of the wheel brake of the inlet valve to be calibrated,building up of a brake pressure (PDBE) by the pressure supply device and setting of a valve control variable at the inlet valve to be calibrated, causing the inlet valve to be calibrated to open,detecting the opening of the inlet valve to be calibrated by a volume flow of the pressure supply device or the motor speed of the electric motor of the pressure supply device,determining the associated values of the valve control variable and the brake pressure (PDBE), andstoring the determined calibration point in the control and regulating unit. 14. The method as claimed in claim 13, wherein the outlet valve of the wheel brake of the inlet valve to be calibrated is closed, and the wheel brake pressure of the wheel brake is determined by a specified or predetermined pressure/volume characteristic curve of the wheel brake and of the pressure medium volume output by the pressure supply device. 15. (A brake system for motor vehicles comprising: an electrically controllable, electric-motor-driven pressure supply device, which can supply a brake pressure (pDBE) for actuating hydraulically actuable wheel brakes, wherein the pressure supply device is configured to be connected separably to the wheel brakes by respective electrically controllable inlet valves,one electrically controllable outlet valve per wheel brake, via which the wheel brake is connected separably to a pressure medium reservoir, in under atmospheric pressure,a pressure detection device for determining the brake pressure (pDBE) supplied by the pressure supply device,a brake master cylinder that can be actuated by a brake pedal and is connected separably to the wheel brakes, andan electronic control and regulating unit for controlling the pressure supply device and the inlet and outlet valves, wherein at least one inlet valve or one outlet valve is analogized or capable of analog control, wherein the method of claim 1 is carried out in the electronic control and regulating unit, for each analogized or analog-controlled inlet valve and outlet valve of the brake system.
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이 특허에 인용된 특허 (3)
Gronau Ralph,DEX ; Buschmann Gunther,DEX, Hydraulic braking system with electronic braking pressure regulation.
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