US 5,551,764 A · Brake system for automotive vehicles with electric drive

Abstract

A brake system for automotive vehicles with electric drive is operable by an actuating pedal and uses hydraulic friction brakes to augment the braking effect generated by the electric drive motors. The coaction of the drive motors with the hydraulic friction brakes is controlled by an electronic controller. In order to largely conform the pedal characteristics of the mentioned brake system to that of a standard passenger car, an actuating pedal (5) is in force-transmitting and travel-transmitting connection with a spring (8) exhibiting a predetermined characteristic curve, and the master brake cylinder (11), uncoupled from the actuating pedal (5), is operable by an electromagnet (9) which is responsive to the controller (70). If the master brake cylinder accommodates two pressure cheers, a single valve is arranged in or on the master cylinder housing, and acts as both a bypass valve and a differential-pressure valve.

Claims50

Dependent claims

A brake system for automotive vehicles with electric drive which is operable by an actuating pedal cooperating with an actuating rod, comprising at least one electric drive motor and hydraulic friction brakes which are connected to a master brake cylinder, means for determining a pressure prevailing in the master brake cylinder, a first control device to which the output signal of a sensor for determining the actuating condition of the actuating pedal is fed, and a second control device, responsive to said first control device, for controlling the electric drive motor, characterized in that the actuating pedal is in force-transmitting/travel-transmitting connection with a spring having a predefinable characteristic curve, and in that the master brake cylinder, uncoupled from the actuating pedal, is operable by an electromagnet drivable by the first control device.

A brake system for automotive vehicles having electric drive comprising:

an actuating pedal;
an actuating rod coupled to said actuating pedal and movable in response to said actuating pedal;
a plurality of vehicle wheels;
at least one electric drive motor for driving and braking said plurality of vehicle wheels;
a master brake cylinder having a master brake cylinder piston which is uncoupled from the actuating pedal until said actuating pedal has travelled a threshold distance;
a plurality of hydraulic friction brakes connected to said master brake cylinder and individually associated with said plurality of vehicle wheels for braking said plurality of vehicle wheels;
means for determining a pressure prevailing in said master brake cylinder;
a sensor for determining the actuating position of said actuating pedal and for generating actuating pedal position signals;
a first control device responsive to said actuating pedal position signals for generating first control signals;
a first electromagnet responsive to said first control device for actuating said master brake cylinder piston;
a second control device responsive to said first control signals for generating second control signals to control said at least one electric drive motor;
and
a spring, coupled to said actuating pedal, having a predetermined characteristic curve for simulating a reaction force caused by hydraulic braking to said actuating pedal.

10 more elements

Dependencies are inferred from the claim text.

Brake system for automotive vehicles with electric drive

Life of this patent

Brake system for automotive vehicles with electric drive

Life of this patent

Abstract

Claims50