Bosch Automotive Systems Corporation

Toshiko Okazaki

Junichi Kaneko

In an electronic control unit, a duty conversion mapfrom which a driving duty in energizing and driving an electromagnetic coil, not shown, of an electromagnetic vacuum adjustment valveon the basis of a variable equivalent to target quantity of feedback of exhaust gas, for example, the magnitude of a desired negative pressure to a negative pressure output port (not shown) of the electromagnetic vacuum adjustment valve, and a duty correction mapfrom which a correction value for the driving duty is acquired on the basis inputted battery voltage and engine cooling water temperature, are provided. The driving duty is multiplied by the correction value acquired from the duty correction map, and on the basis of the corrected driving duty, energization to the electromagnetic vacuum adjustment valveis performed by a driving circuit

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Saitama, Japan

Toshiko Okazaki