Patent ID: 6877471

Claim:
An engine control device comprising: a throttle position sensor for outputting a throttle position signal indicating a throttle valve opening degree; a revolution speed sensor for outputting an engine revolution speed signal; and an intake pipe pressure sensor for outputting a measured intake pipe pressure signal, wherein the engine control device has at least a failure judgment means for judging a failure of the intake pipe pressure sensor, the failure judgment means includes a first data processing for outputting an estimated intake pipe pressure signal on the basis of the throttle position signal from the throttle position sensor and the engine revolution speed signal from the revolution speed sensor, a second data processing for outputting a modification estimated intake pipe pressure signal in which the estimated intake pipe pressure signal is modified, and a failure judgment processing for making at least a failure judgment of the intake pipe pressure sensor by comparing the measured intake pipe pressure signal with the modification estimated intake pipe pressure signal, and the modification estimated intake pipe pressure signal includes a change portion changing between a change portion of the estimated intake pipe pressure signal and a change portion of the measured intake pipe pressure signal, when the throttle valve opening degree is changed.