Abstract: An exhaust gas recirculating valve with vacuum motor actuator is integrally combined with an electronic control system having a valve position sensor and an electrically controlled pilot valve for the vacuum motor. The electronic control system responds directly to an externally generated low power voltage signal so that the voltage signal and the valve position are related in a monotonic manner. A signal circuit indicates when the exhaust gas recirculating valve is under command of the externally generated low power voltage signal.

Abstract: A low oil pressure sensor (32) is provided for direct mounting to a lubrication pump (4) for direct sensing of differential pump pressure. An internal sensor body portion (40) is exposed to the internal pump environment and has a magnetically permeable piston (48) axially slideable therein. High and low pressure aperture ports (56 and 50) through the internal sensor body sidewalls communicate respective high and low pressure sides of the pump to respective axial ends (58 and 54) of the piston. A radial gap (60) between the piston (48) and the interior sidewall (62) of the internal body portion provides a long narrow axial damping passage for damping high pressure pulses and transients from the high pressure side of the pump, to prevent false triggering. A magnetic coil (66) in the body detects piston movement according to changed flux linkage.