Method and circuit arrangement for controlling the flow rate of a hydraulic pump

A method of adjusting the flow rate of an electromotively driven hydraulic pump having a motor for a brake system including anti-lock control and traction slip control by brake management to instantaneous requirements, said method comprising the steps of:

• developing a nominal value of the rotational speed of a pump;
• activating the pump by a pulse train having at least one of variable pulse times and variable times of pulse break;
• developing a difference value by comparing the nominal value with an actual value of the pump speed;
• from the difference value, forming the pulse train for the activation of the pump;
• and
• during the times of pulse break of the pulse train, measuring and evaluating the voltage of a motor which drives the pump as a standard of the actual value of the pump speed.

A circuit configuration for adjusting the flow rate of an electromotively driven hydraulic pump having a motor for a brake system including anti-lock control and traction slip control by brake management to instantaneous requirements, said circuit configuration comprising:

• means for supplying a signal representative of the nominal rotational speed of a pump;
• means for supplying a pulse train having at least one of variable pulse times and variable times of pulse break;
• means for comparing the signal representative of the nominal rotational speed of the pump with a signal representative of the actual speed of the pump and for developing a signal representative of the difference;
• means responsive to the signal representative of the difference for forming the pulse train for activation of the pump;
• and
• means for:
• (a) measuring and evaluating the voltage of a motor which drives the pump as a standard of the actual rotational speed of the pump during the times of pulse break of the pulse train, and
• (b) returning the measured and evaluated voltage for comparison with the signal representative of the nominal rotational speed of the pump.