Process and circuit configuration for controlling a brake system with sequential brake pressure modulation

A process for controlling a brake system with slip control wherein, in the event of control, brake pressure is sequentially modulated in the individual control channels, using a master cylinder connected to which are wheel brakes, through multi-way valves wheel open in the basic position and reswitchable to the blocking position, and a modulator coupled ahead of the master cylinder and generating, through auxiliary pressure controlled by multi-way modulator valves, a force component counter-acting the pedal force, said process comprising the steps of:

• determining rotating pattern of the wheels by wheel sensors with electrical signals being generated for controlling the multi-way wheel valves, forming a modulator pressure pattern representing by approximation the course of pressure in the modulator as a function of predetermined variables determining the pressure prevailing in at least one control chamber of the modulator, and determining the periods of excitation of at least one of the multi-way wheel valves and the multi-way modulator valves for the brake pressure control as a function of said signals, whereby by measuring and integrating variables determining the pressure prevailing in the wheel brakes, a wheel pressure pattern is formed and is considered when determining the periods of excitation of the said at least one of the multi-way wheel valves and the multi-way modulator valves.

A process for controlling a brake system with slip control wherein, in the event of control, brake pressure is sequentially modulated in the individual control channels, using a master cylinder connected to which are wheel brakes, through multi-way valves wheel open in the basic position and reswitchable to the blocking position, and a modulator coupled ahead of the master cylinder and generating, through auxiliary pressure controlled by multi-way modulator valves, a force component counter-acting the pedal force, said process comprising the steps of:

• determining rotating pattern of the wheels by wheel sensors with electrical signals being generated for controlling the multi-way wheel valves, forming a modulator pressure pattern representing by approximation the course of pressure in the modulator as a function of predetermined variables determining the pressure prevailing in at least one control chamber of the modulator, and determining the periods of excitation of at least one of the multi-way wheel valves and the multi-way modulator valves for the brake pressure control as a function of said signals, wherein in the step of forming the wheel pressure pattern, the periods of excitation of the multi-way wheel valves provided in the pressure fluid conduits leading to the wheel brakes, are measured and integrated under incorporation of the pressure increase and pressure decrease characteristics of the system and a variable proportional to the pressure in the wheel brake upon commencement of the slip control.