| 摘要 |
<p>A system and method are provided for controlling an anti-lock braking system (ABS) in a motor vehicle where the ABS is performed by an electronic braking system (EBS) which includes a pulse width modulating (PWM) drive circuit connected to a solenoid (30) in a modulator valve (20). The modulator valve controls air from a pressurized air source (12) to a brake cylinder. The PWM drive circuit (100) allows the solenoid to accurately control the pressure to the brake cylinder during the braking operation to control the smoothness of the current and force profiles. During steady-state control operation of the system, a diode (146) in the drive circuit is connected in parallel with the solenoid. When quick dissipation occurs, the diode is eliminated from the circuit by opening the drive circuit with a high-side and low-side switch system (44, 120). This allows for optimal performance of the drive circuit when the EBS is in either the steady-state or quick dissipation mode.</p> |
