Patent ID: 7813849

Claim:
A vehicle control system comprising: a boosting circuit that supplies a boosting voltage to a rotating electric machine; a boosting voltage setting unit that sets a value of the boosting voltage of the boosting circuit according to a detection result of an atmospheric pressure sensor; an abnormality diagnosis unit that performs a diagnosis of an abnormality on the atmospheric pressure sensor or an engine intake pressure sensor, based on a comparison between a value detected by the engine intake pressure sensor and a value detected by the atmospheric pressure sensor when an engine has stopped; a circuit unit power supply that supplies operational electric power to the abnormality diagnosis unit; and a power supply stop delaying unit that delays a stop of the circuit unit power supply until an atmospheric pressure return period, during which an air pressure detected by the engine intake pressure sensor returns to an atmospheric pressure, has elapsed, wherein when a time change of an air pressure value, detected by the engine intake pressure sensor immediately after the system start command, is larger than a predetermined rate of change, the abnormality diagnosis unit determines that it is not necessary to perform a diagnosis of an abnormality on the atmospheric pressure sensor and the engine intake pressure sensor, based on an assumption that the present system start command was output following the previous system stop command, and otherwise the abnormality diagnosis unit permits the diagnosis of an abnormality on the atmospheric pressure sensor and the engine intake pressure sensor.