Denso Corporation

Masaya Oi

Yoshiyuki Maki

Koji Nagata

Tetsuya Otaki

Kenichi Maki

The re-use property of a vehicular controller service program is improved by providing a structure capable of easily changing the method of communication to/from an external apparatus and a structure capable of easily changing the vehicle information required for such communication. A service management object communicates with an external scanning tool which is constituted separately from a service execution object including objects for obtaining the fault information. Each individual object thus implements only either communication function with the scanning tool or a vehicle information acquisition function. Thus when changes are required for one of these functions, the remaining object-oriented program modules can be re-used without change. The service execution object may be prepared to obtain every category of fault information desired depending on legislation or vehicle manufacturer requirements.

Controller for vehicle with information providing function and recording medium

A self-diagnosis program for a vehicle is object-oriented designed. The self-diagnosis program is provided with a malfunction detection object for detecting a malfunction provided for each malfunction detection processing, and a malfunction information storage object for storing the malfunction information provided for each malfunction item. A malfunction information management object has the correlative relation between the malfunction detection object and the malfunction information storage object. Upon receiving a normality/abnormality message from the malfunction detection object, the malfunction information management object determines the corresponding malfunction information storage object and stores the malfunction information.

Control apparatus having object-oriented self-diagnosis program

To enable easier change of a self-diagnostic program for making a contribution towards improvement in quality of the same program, even if it is required to correct an execution condition for fault detection due to the change of a diagnosis object, a diagnostic drive determination object is provided to determine the execution condition of a fault detection object driven from a diagnostic scheduler object. The diagnostic scheduler object determines the fault detection object of the drive object and requests the drive acknowledgment to the diagnostic drive determination object. Upon issuance of the drive acknowledgment request, the diagnostic drive determination object obtains the information required for the execution condition determination and notifies a drive acknowledgment/non-acknowledgment message. Only when the acknowledgment message is notified, does the diagnostic scheduler object issue a drive instruction to the fault detection object of the diagnostic object.

Controller for vehicle with self-diagnostic function and recording medium

A control method and apparatus which detects a solenoid current as a voltage, and PWM-controls a transistor for a solenoid such that the detection voltage becomes a target voltage. A feedback gain, used for setting PWM signal output time, is set in accordance with the difference between the detection voltage and the target voltage such that the greater the difference becomes, the greater the feedback gain becomes. Further, a detection voltage after a predetermined period is estimated based on the change of detection voltage from the past. If the estimation value overshoots the target voltage, a difference B between the detection voltage and the target voltage and a difference C between the detection voltage and the estimation value are obtained, and the feedback gain is varied by multiplying the feedback gain by the ratio B/C between the these differences.

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Okazaki, Japan

Masaya Oi