| 摘要 |
PROBLEM TO BE SOLVED: To provide a vehicular negative pressure supply device for reliably supplying negative pressure to negative pressure operated equipment even when a negative pressure pump is malfunctioned, while avoiding other troubles including engine stall and battery exhaustion. SOLUTION: Under idling control request, when the negative pressure pump for supplying negative pressure to a brake booster is malfunctioned (S310: YES) and the negative pressure of th brake booster does not reach a specified value (S320: YES), the control of the opening of an ISC valve to be greater than a preset opening for idle-up with idling control processing is prohibited (S330). Thereby, negative pressure is reliably supplied from an intake pipe of an engine to the brake booster, and then the processing of reducing load on a crank shaft of the engine is performed to prevent engine stall and the processing of reducing power consumption is performed to prevent battery exhaustion (S340). COPYRIGHT: (C)2007,JPO&INPIT
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