摘要:
The invention relates to a method and a pressure control device for calibrating an analogue regulating, electrically controllable hydraulic valve (2, 2',3, 3', 3'', 3''') in a device comprising at least one externally supplied pressurisation unit (1, 1') and pressure sensors (9, 10, 10', 10'', 10'''), said device having several pressure control circuits (A, B, C, D) and in particular several brake circuits (I., II.) and at least some of the pressure circuits being connected to a pressure sensor that is allocated to said respective circuits in addition to inlet and outlet valves. During said method, several calibration routines for generating and storing automatically determined calibration data are carried out and pressure is generated in at least one pressure control circuit (A, B, C, D) by the externally supplied pressurisation unit (1, 1') during or prior to each calibration routine. Calibration data for one or more analogue regulating hydraulic valves is then recorded with the aid of the pressure that has built up.
摘要:
The invention relates to a method for operating a brake system of a vehicle which comprises a master brake cylinder (4) which can be activated by the driver by means of a brake pedal (1), at least one driver-independent pressure source (11), at least one wheel brake (9a, 9b) to which a wheel speed sensor is assigned, and a brake activation sensor (5), wherein it is checked whether a hazardous situation is present, and in the case of a hazardous situation being detected the at least one driver-independent pressure source (11) is activated. According to the invention, a hazardous situation is detected when the change in a measured deceleration (a) over time or the absolute value of a measured deceleration (a) exceeds a predefined hazard threshold value (a ctive ) and a brake activation operation is detected. In addition, the invention relates to a brake system for a motor vehicle having brake assistance in hazardous situations ("brake assistant") which does not require a master brake cylinder pressure sensor.
摘要:
The invention relates to a method for pressure build up control in an electronic adjustable braking system, preferably in a motor vehicle, comprising a main brake cylinder, in particular tandem main cylinder (THZ), a vacuum servobrake (booster), at least one other pressure source for assisting a brake force, preferably a hydraulic pump, which is controlled by a control unit and by which a pressure is applied to wheel brakes. The inventive method consists in determining an approximation at a point where a predetermined ratio of an auxiliary force for the vacuum servobrake (booster) operating force (full control point) is not attained, in determining a pressure gradient in the main brake cylinder (THZ pressure gradient) and in actuating the other pressure source assisting the braking force for a known approximation at the full control point of the booster in order to set up an additional brake pressure when the limit value of the pressure gradient exceeds the determined THZ pressure gradient.
摘要:
The invention relates to a method for regulating a predetermined modifiable brake pressure in the wheel brakes of a brake system, according to which input variables that determine the brake pressure in the individual wheel brakes are evaluated and control variables of hydraulic valves are defined in a control and/or data processing system. The aim of the invention is to obviate the need for additional pressure sensors, which register the pressure of the wheel brakes. To achieve this a characteristic curve is stored in the control or data processing system, said curve correlating the valve characteristics of the hydraulic valve with a pressure differential of the hydraulic valve and the control variable of the hydraulic valve, in particular the valve flow, is defined according to said characteristic curve.
摘要:
The invention relates to a method for determining or calibrating the brake control characteristic of a vacuum brake booster (1) of a vehicle braking system. The pressure in the working chamber (2) or the pressure difference between the working chamber (2) and the vacuum chamber (3) of the vacuum brake booster (1) is determined, and either the brake control characteristic is determined on the basis of the determined pressure or pressure difference of the vacuum brake booster (1), or the stored brake control characteristic is changed according to the determined pressure or pressure difference.