Fault diagnosis method and - a device for manifold pressure sensors

摘要

Fault diagnosis method for manifold pressure sensors, which in a machines expensive / control system are used, the a first manifold pressure sensor (5a), which a main control / regulation is carried out, a second manifold pressure sensor (5b) in the form of a reserve for the first manifold pressure sensor (5a) is used, a atmospheres pressure sensor (9), a machine speed detecting means (10) and has a throttle sensor (6a),the machines expensive / control system a first detection circuit (100), comprising a first ecu (14a) and a first sensor group (101), which forms the first manifold pressure sensor (5a), and a second detection circuit (200), which a second ecu (14b) and a second sensor group (201), said second manifold pressure sensor (5b), comprising:a step of calculating an estimated manifold pressure on the basis of the machine speed, a throttle opening and a atmospheres pressure value;a step of detecting a failure when a difference between an output from the first manifold pressure sensor and an output from the second manifold pressure sensor exceeds a predetermined region;a step of specifying a sensor of the first and second manifold pressure sensors (5a, 5b), of which a greater difference between the output and the estimated manifold pressure, as a failed sensor, if a failure has been determined;a step of switching between the first detection circuit (100) and the second detection circuit (200), wherein a first, of the first detection circuit (100) is output at a switching signal (sa) an input side of a not - and - circuit (20) is supplied and a second, from the second detection circuit (200) is output at a switching signal (sb) an input side of the inverted not - and - circuit (20) is supplied, and the output of the not - and - circuit (20) a first change-over switch (16) directly and a second change-over switch (17) is fed in inverted form, in order to switch between the first detection circuit (100) and the second detection circuit (200) to cause.