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AssigneeHitachi, Ltd.
InventorsMotoki Tatsumi, Kazuhiko Abe, Mitsuhiko Kubota
Estimating the term…
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An electronic control apparatus for a vehicle having an engine control unit 114 controlling an electronically-controlled throttle of an engine and a valve control unit 141 controlling a variable lift mechanism 112 that varies a lift amount of an intake valve are provided. Information of a target lift amount and an actual lift amount is transmitted/received between these control units. Each of the control units diagnoses a state of data transmission from the other control unit, transmits the diagnosis result to the other control unit and, when the diagnosis result of itself and/or the diagnosis result of the other control unit shows an abnormal state, moves to the mode of a fail-safe operation.
An electronic control apparatus for a vehicle, comprising:
An electronic control apparatus for a vehicle, comprising:
A diagnosing method of an electronic control apparatus for a vehicle, having a plurality of control units associable in communication with one another and a communication circuit that provides a connection for communication among the plurality of control units, the method comprising the steps of:
Dependencies are inferred from the claim text.
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Characterised by the use of digital means: using computer, e.g. microprocessor
Details of control systems for road vehicle drive control not related to the control of a particular sub-unit , e.g. process diagnostic or…
Valve-gear or valve arrangements, e.g. lift-valve gear: characterised by the provision of means for changing the timing of the valves without…
By modification of rocker arm ratio: by means of an eccentric
From the US filing history. Foreign family members aren’t listed.
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1. Field of the Invention
The present invention relates to an electronic control apparatus adapted for a vehicle, not exclusively but preferably a car, and provided with a plurality of control units and a communication circuit providing a connection for communication among the control units.
2. Description of the Related Art
FIG. 1 is a system diagram of a vehicular engine to which the present invention is applied;
FIG. 2 is a perspective view showing the details of a variable lift mechanism illustrated in FIG. 1;
FIG. 3 is a side view showing the details of the variable lift mechanism illustrated in FIG. 1;
Embodiments of the present invention will be described hereinbelow.
FIG. 1 is a system configuration diagram of a vehicular engine, e.g., a car engine.
Referring to FIG. 1, an electronically-controlled throttle 104 for driving a throttle valve 103b by a throttle motor 103a is disposed in an intake pipe 102 of an engine (gasoline internal combustion engine) 101.