A multi-function vehicle engine control system whose collective case includes a main control circuit unit connected with an engine control output circuit unit and a transmission control output circuit unit, a monitoring control circuit unit serial connected with the main control circuit unit, and an error processing circuit unit, or a function-separated vehicle engine control system whose first case includes a first main control circuit unit connected with an engine control output circuit unit, a first monitoring control circuit unit serial connected with the first main control circuit unit, and a first error processing circuit unit,
- wherein the function-separated vehicle engine control system is connected with a transmission control apparatus whose second case includes a second main control circuit unit connected with a transmission control output circuit unit, a second monitoring control circuit unit serial connected with the second main control circuit unit, and a second error processing circuit unit,
- wherein the monitoring control circuit unit, and the first monitoring control circuit unit and the second monitoring control circuit unit, and, the error processing circuit unit, and the first error processing circuit unit and the second error processing circuit unit are all integrated in such a way that the redundancy of common part among the corresponding circuit units is avoided;
- and the integrated device forms a shared integrated circuit device that collaborates with the main control circuit unit, the first main control circuit unit, or the second main control circuit unit,
- wherein the main control circuit unit or the first main control circuit unit includes a microprocessor or a first microprocessor, as the case may be, that operates with an opening/closing signal or an analogue signal, as an input signal, obtained from a first sensor group, which is utilized in engine control, and a second sensor group, which is utilized in transmission control, and that generates at least a fuel injection control output for a fuel-injection electromagnetic valve and a valve-opening control output for an intake valve opening degree control motor for an intake valve provided in an air-intake throttle,
- wherein the main control circuit unit or the second main control circuit unit includes the microprocessor or the second microprocessor, as the case may be, that operates with an opening/closing signal or an analogue signal, as an input signal, obtained from the first sensor group, which is utilized in engine control, and the second sensor group, which is utilized in transmission control, and that generates a transmission-control output, including at least a speed-change control output, for an automatic transmission,
- wherein a valve-opening drive mechanism of the intake valve using the intake valve opening degree control motor includes an initial-position returning mechanism that makes it possible to perform evacuation driving using a fixed intake valve opening degree when power supply to the intake valve opening degree control motor is stopped,
- wherein a transmission driving mechanism of the automatic transmission includes a transmission ratio fixation mechanism that makes it possible to at least travel forward at a fixed transmission ratio suitable for middle- or high-speed driving when during variable-speed forward driving, power supply to the automatic transmission is stopped or when power-supply driving of all automatic transmission control electromagnetic valves included in the automatic transmission is stopped,
- wherein a shared monitoring control circuit unit incorporated in the integrated circuit device is provided with a valve-opening system control abnormality determinator that sequentially transmits to the microprocessor or the first microprocessor in operation a plurality of question information pieces related to at least a creation program for the valve-opening control output, receives from the microprocessor or the first microprocessor answer information pieces corresponding to the question information pieces, compares the answer information pieces with the respective corresponding correct answer information pieces, preliminarily stored in the shared monitoring control circuit unit, determines whether or not a code check abnormality and an answering-response delay exist in the answer information so as to determine whether or not a valve-opening control abnormality including a communication abnormality and a question-answer abnormality exists, and then creates a valve opening control abnormality signal, which is one of valve opening system control abnormality signals,
- wherein a shared error processing circuit unit incorporated in the integrated circuit device is provided with a watchdog timer that generates a basic reset signal when a calculation period of the microprocessor or the first microprocessor is abnormal and then initializes and restarts the microprocessor or the first microprocessor, a first storage circuit that is set when a first state is established in which the occurrence count or the occurrence frequency of each of the basic reset signal and the valve opening control abnormality signal becomes the same as or larger than a predetermined threshold value or the total occurrence count or the total occurrence frequency of the basic reset signal and the valve opening control abnormality signal becomes the same as or larger than a predetermined threshold value, and a first gate circuit,
- wherein when the first storage circuit has stored the occurrence of an abnormality, a first cutoff circuit stops power supply to the intake valve opening degree control motor,
- wherein the first gate circuit resets the microprocessor or the first microprocessor through the basic reset signal and the valve opening control abnormality signal when the first state has not been established, and after the first storage circuit has stored the occurrence of an abnormality, the first gate circuit prohibits the valve opening control abnormality signal from performing reset processing of the microprocessor or the first microprocessor so that a continuous non-runaway repeated abnormality related to valve-opening control is suppressed from providing an effect to fuel injection control, and
- wherein the main control circuit unit or the second main control circuit unit collaborates with the shared error processing circuit unit incorporated in the integrated circuit device so as to detect and store an occurrence state of at least a transmission system control abnormality signal, and a second cutoff circuit, which responds to the transmission system control abnormality signal, stops a driving output to at least the automatic transmission control electromagnetic valve in the automatic transmission by having detected a transmission-control abnormality.