Patent ID: 7103468
Filing Date: 2006-09-05
Classification: B60K,B60L,B60W,F01L,F02D,Y02T

Abstract:
1. A failure detection device for a vehicle having a deceleration deactivatable engine in which it is possible to deactivate at least one cylinder by closing both of intake and exhaust valves thereof by applying the oil pressure of operation oil to a passage for deactivation execution via an actuator, and also it is possible to cancel the closed state of both of said intake and exhaust valves by applying the oil pressure of said operation oil to a passage for deactivation cancellation, said failure detection device comprising: a driving state distinguishing section for distinguishing the current driving state of said vehicle from several driving states; an oil pressure measuring section provided in said passage for deactivation cancellation for measuring the oil pressure of said operation oil; an oil pressure condition judgement section for determining whether or not the oil pressure of said operation oil measured by said oil pressure measuring section satisfies threshold conditions for the oil pressure of said operation oil in each of said driving states; and an abnormality judgement section for making judgement that abnormality exists when it is determined, by said oil pressure condition judgement section, that the oil pressure of said operation oil does not satisfy said threshold conditions.