Loading patent…
AssigneeContinental Teves AG & Co. oHG
InventorsMichael Kutzner, Alexander Treib, Hans Schroth, Peter Handke, Abolfazl Akbari-Namwar
Estimating the term…
A method for conveying a metered hydraulic volume in a vehicle braking system by an electrically driven motor pump assembly, wherein a mechanical pump of the motor pump assembly is driven by an electric motor of the motor pump assembly. A rising motor voltage ramp is applied to the electric motor, a motor current being detected, and a conveying mode of the motor pump assembly starting as soon as a motor torque generated by the motor current exceeds a total of drag torque, breakaway torque and friction torque of the motor pump assembly. The motor current reduces when the conveying mode starts. The method is characterized in that, when a reduction in the motor current is detected after a specified time interval has elapsed, a motor voltage is reduced to a value which ends the conveying mode. The invention further relates to a vehicle braking system.
A method for delivering a metered hydraulic volume in a vehicle braking system by an electrically driven motor pump assembly, in which a mechanical pump of the motor pump assembly is driven by an electric motor of the motor pump assembly, wherein the electric motor is acted upon by a rising motor voltage ramp, wherein a motor current is detected, and wherein a delivery mode of the motor pump assembly starts as soon as a motor torque generated by the motor current exceeds a sum of drag torque, breakaway torque, and friction torque of the motor pump assembly, and wherein the motor current reduces when the delivery mode starts, and wherein a motor current is reduced to a value which terminates the delivery mode immediately after the reduction in the motor current at the start of the delivery mode is detected.
A method for delivering a metered hydraulic volume in a vehicle braking system by an electrically driven motor pump assembly, in which a mechanical pump of the motor pump assembly is driven by an electric motor of the motor pump assembly, wherein the electric motor is acted upon by a rising motor voltage ramp, wherein a motor current is detected, and wherein a delivery mode of the motor pump assembly starts as soon as a motor torque generated by the motor current exceeds a sum of drag torque, breakaway torque, and friction torque of the motor pump assembly, and wherein the motor current reduces when the delivery mode starts, and wherein a motor current is reduced to a value which terminates the delivery mode when a reduction in the motor current is detected after a specified time interval has elapsed, and wherein an angular position of the motor and/or the pump is determined by the motor voltage, the motor current, and a predetermined hydraulic pressure in the vehicle braking system.
A vehicle braking system, comprising at least one electronic control unit and at least one hydraulic brake circuit having an electric motor pump assembly, wherein an electric motor of the motor pump assembly drives a mechanical pump of the motor pump assembly, wherein the control unit acts upon an electric motor of the motor pump assembly with a rising motor voltage ramp, wherein the control unit detects a motor current, and wherein a delivery mode of the motor pump assembly starts as soon as a motor torque generated by the motor current exceeds a sum of drag torque, breakaway torque, and friction torque of the motor pump assembly, and wherein the motor current reduces when the delivery mode starts, and wherein the control unit reduces a motor current to a value which terminates the delivery mode immediately after the reduction in the motor current at the start of the delivery mode is detected.
Dependencies are inferred from the claim text.