Control unit for vehicle and control system

An engine control unit which controls an operational condition of an engine by performing a series of programs, wherein:

• the series of programs includes an application program which computes information to be sent to at least one of a fuel injection valve, distributor and ISC valve based on information from at least one of an air flow sensor, water temperature sensor, throttle opening degree sensor and crank angle sensor, for controlling the operational condition of the engine;
• and
• the series of programs also includes an interface program for receiving signals from at least one of the air flow sensor, water temperature sensor, throttle opening degree sensor and crank angle sensor, for sending signals to at least one of the fuel injection valve, distributor and ISC valve, said interface program computing signals including at least one of intake air flow rate, water temperature, throttle opening degree and engine rotational number necessary for use in the application program, and performing data transmission and reception with the application program using said computed signals;
• and
• the application program and the interface program are modifiable independently of each other, such that when one program is modified, the other program ca be used without modification.

An automatic transmission control unit which controls an operational condition of an automatic transmission by performing a series of programs, wherein:

• the series of programs includes an application program which computes information to be sent to at least one actuator for controlling hydraulic pressure of the automatic transmission and to a solenoid for controlling transmission position, based on information with respect to at least one of a throttle opening degree, air flow rate, water temperature, idle switch signal and vehicle speed, for controlling the operational condition of the automatic transmission;
• and
• the series of programs also includes an interface program for receiving signals regarding at least one of the throttle opening degree, air flow rate, water temperature, idle switch signal and vehicle speed, and for sending signals regarding at least one of line pressure for controlling hydraulic pressure for the automatic transmission, and a solenoid signal for controlling transmission position, said interface program computing signals including at least one of intake air flow rate, water temperature, throttle opening degree and engine rotational number necessary for use in the application program, and performing data transmission and reception with the application program using said computed signals;
• and
• the application program and/or the interface program are modifiable independently of each other, such that when one program is modified, the other program can be used without modification.