Patent ID: 9637098
Date: 2017-05-02
CPC Classifications: B60T

Claim:
1. A brake control system for a vehicle having steerable front wheels, left and right rear wheels, a left brake unit for braking the left rear wheel, a right brake unit for braking the right rear wheel, and a single manually operated brake input device, the brake control system comprising: a main brake valve having a supply port, a return port, an outlet and a valve spool for controlling communication between the supply port, the return port, and the outlet; a link which operatively couples the valve spool to the brake input device; a solenoid operated normally open left turn valve for controlling communication between the outlet and the left brake unit; a solenoid operated normally open right turn valve for controlling communication between the outlet and the right brake unit; a solenoid operated normally open balance valve for controlling communication between the left and right brake units; a brake position sensor for sensing a position of the brake input device; a turn angle sensor; a vehicle speed sensor; and an electronic control unit (ECU) connected to the brake position sensor, to the turn angle sensor and to the vehicle speed sensor, the ECU controlling the left and right turn valves and the balance valve as a function of signals from the brake position sensor, the turn angle sensor and the vehicle speed sensor.