Abstract: A pressure sensor is integrated upon a solenoid valve by attaching at least one micro-machined strain gauge to an end of the solenoid valve sleeve. The solenoid valve is included in a vehicle brake control system. As the hydraulic fluid pressure in the brake system changes, the end of the solenoid valve sleeve is deflected, causing a change in an electrical property of the strain gauge. The stain gauge is included in a bridge circuit that is electrically connected to a signal conditioning circuit. The signal conditioning circuit generates a pressure signal that is a function of the change in the electrical property of the strain gauge.

Abstract: A pressure sensor is mounted integrally in a hydraulic valve body. The sensor has a base which extends into a bore formed in the valve body. The valve body bore is in communication with a pressurized hydraulic fluid. A first circumferential groove formed in the sensor base carries an O-ring which forms a seal between the sensor and the wall of the valve body bore. A second circumferential groove formed in the sensor base carries a spring ring which extends into a corresponding groove formed in the wall of the valve body groove. The spring ring cooperates with the sensor base and valve body bore grooves to retain the sensor in the valve body bore.