Patent ID: 7823986

Claim:
A method of controlling: a device for supplying pressure to an actuation unit of a vehicle brake system of a hybrid vehicle equipped with an internal combustion engine and an electric motor, the device including a pneumatic motor-and-pump assembly with a pump and a motor driving the pump, wherein the pneumatic motor-and-pump assembly is driven by an electronic control unit depending on a pressure level or pressure difference in a pneumatic brake booster of the actuation unit, with the pressure level in a chamber or a difference in pressure between two chambers of the brake booster being detected by means of a sensor, and wherein the control unit for controlling the pneumatic motor-and-pump assembly comprises a logic module and a power module which are arranged separately of each other, the method comprising the steps of: sensing the pressure level in the chamber or the difference in pressure between the two chambers of the brake booster of the actuation unit; driving the pneumatic motor-and-pump assembly with the electronic control unit depending on the pressure level or the pressure difference in the pneumatic brake booster; activating the pneumatic motor-and-pump assembly upon a failure of the electronic control unit; submitting a signal to a motor control unit in the event of an error of the electronic control unit which drives the motor-and-pump assembly; and operating the internal combustion engine such that the supply of the pressure to the actuation unit is carried out by the internal combustion engine alone.