Loading patent…
OwnerLeo Gilles, Erwin Michels +2inventors
InventorsLeo Gilles, Erwin Michels, Wilfried Giering, Benedikt Ohlig
Estimating the term…
Brake equipment comprising a hydraulic, single- or multi-circuit braking system of a land vehicle having an electric drive for executing a regenerative braking of the land vehicle by means of at least one electric machine in or on the drive train of the vehicle and also a braking of the land vehicle by means of at least one wheel brake. A brake pedal and at least one sensor are used to detect a braking requirement of the driver. A master cylinder is used to supply pressurized hydraulic fluid into at least one brake circuit that supplies at least one wheel brake in accordance with the braking requirement. Associated with at least one brake circuit is an electrohydraulic control unit comprising at least a first connection for hydraulic fluid and at least a second connection for hydraulic fluid. An electronic control unit controls components of the electrohydraulic control unit such as a hydraulic pump and switching valves as a function of a braking requirement and/or sensor signals that represent ambient quantities or characteristic quantities coming from the braking system. A regenerative brake unit has at least a first connection for hydraulic fluid and at least a second connection for hydraulic fluid and is hydraulically coupled into at least one of the brake circuits between the master cylinder and at least one of the wheel brakes. The regenerative brake unit is actuated by the electronic control unit to bring about the effect that, in the event of a regenerative braking operation, the volume of hydraulic fluid corresponding to the braking requirement is not supplied into the wheel brakes, but is stored.
Brake equipment comprising a hydraulic, single- or multi-circuit braking system of a land vehicle having an electric drive for executing a regenerative braking of the land vehicle by means of at least one electric machine in or on the drive train of the vehicle and also a braking of the land vehicle by means of at least one wheel brake, wherein
Brake unit according to one of the preceding claims, characterized in that a brake line proceeding from the master cylinder (14) branches into two lines to the wheel brakes (VL, HR, VR, HL) at the wheels, in which inlet valves (58, 60, 62, 64) having a spring-actuated let-through position and an electromagnetically settable blocking position are disposed.
Brake unit according to the preceding claim, characterized in that between the inlet valves (58, 60, 62, 64) and the wheel brakes (VL, HR, VR, HL) there proceeds from the respective brake line one return line each, in which in each case an outlet valve (66, 68, 70, 72) having a spring-actuated blocking position and an electromagnetically settable let-through position is disposed.
Brake unit according to the preceding claim, characterized in that the return lines are brought together in one return line, to which the low-pressure storage chamber (54, 56) is connected.
Brake unit according to the preceding claim, characterized in that the electrically controlled hydraulic pump (48, 50) is connected at its intake side to the return line and at its outlet side by a delivery line to the brake line between the master cylinder and the inlet valves (58, 60, 62, 64).
Brake unit according to the preceding claim, characterized in that disposed in the line between the low-pressure storage chamber (54, 56) and the electrically controlled hydraulic pump (48, 50) is a non-return valve that prevents hydraulic fluid from flowing off into the low-pressure storage chamber (54, 56) in the event of a driver-actuated braking intervention and when the intake control valve (74, 76) is open.
Brake unit according to the preceding claim, characterized in that leading to the intake side of the electrically controlled hydraulic pump (48, 50) is an intake line, in which an intake control valve (74, 76) that has a spring-actuated blocking position and an electromagnetically settable let-through position is situated, which is connected to the brake line via a line.
Brake unit according to the preceding claim, characterized in that situated in the brake line is a shut-off valve (78, 80) that is bypassed by a pressure control valve, wherein the shut-off valve (78, 80) has a spring-actuated let-through position and an electromagnetically settable blocking position and the pressure control valve, in a braking situation that is independent of a braking requirement, allows hydraulic fluid coming from the wheel brakes (VL, HR, VR, HL) to flow to the master cylinder (14) even in the case of an electromagnetically set blocking position of the shut-off valve (78, 80).
Brake unit according to one of the preceding claims, characterized in that during normal operation the valves are in their non-actuated basic position so that the inlet valves (58, 60, 62, 64) are open and the outlet valves (66, 68, 70, 72) are closed.
Brake unit according to one of the preceding claims, characterized in that, in the ABS case, the appropriate valves are opened or closed in a controlled manner and the electrically controlled hydraulic pump (48, 50) is actuated in order to build up or to reduce or maintain pressure in the respective wheel brake or brakes (VL, HR, VR, HL).
Brake unit according to one of the preceding claims, characterized in that the electrically controlled hydraulic pump (48, 50) in the electrohydraulic control unit is a reciprocating pump that has six pistons and whose electric drive motor is supplied with a pulse-width-modulated (PWM) operating current that has a minimum pulse width of between 15 and 45 μsec.
Dependencies are inferred from the claim text.