Vehicle control system ensuring stability of control

A vehicle control system comprising:

• a target output torque determining block which determines a target output torque of a power train of a vehicle at least based on a preselected operating maneuver by an operator of a vehicle;
• an allowable torque range determining block which determines an allowable torque range, within which the power train is allowed to output torque, based on an operating condition of the power train;
• a target output torque correction block which keeps the target output torque, as determined by said target output torque determining block, as it is when the target output torque lies within the allowable torque range and also corrects the target output torque to be within the allowable torque range when the target output torque lies out of the allowable torque range;
• and
• a power train control block which controls an operating of the power train to bring an output of the power train into agreement with the target output torque, as provided by said target output torque correction block,
• wherein said target output torque determining block and said target output torque correction block are constructed in a first electronic control unit, and said allowable torque range determining block and said power train control block are constructed in a second electronic control unit,
• wherein said second electronic control unit determines the allowable torque range of the power train through said allowable torque range determining block and transmits a signal indicative thereof to said first electronic control unit,
• wherein said first electronic control unit receives the signal from said second electronic control unit to sample the allowable torque range and determines the target output torque within the allowable torque range through said target output torque determining block and said target output torque correction block to output a signal indicative thereof to said second electronic control unit, and
• wherein said second electronic control unit includes a failure determination block which compares the target output torque, as carried by the signal from said first electronic control unit, with the allowable torque range, when the target output torque lies out of the allowable torque range, said failure determination block determining that an error has arisen in the target output torque.