Valve-timing controller for an internal combustion engine

Details Valve-timing controller for an internal combustion engine Valve-timing controller for an internal combustion engine

1998-05-20

2000-06-27

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9017, 731172, 731181, F01L 134

Patent

active

060793813

ABSTRACT:
A system and method for determining abnormality of a VVT (variable valve-timing control mechanism) and controlling the VVT on consideration of responsiveness thereof. When execution conditions for abnormality determination of the VVT are present, speed of change in angle of rotation ACSPD is calculated on a basis of transition in actual angle of rotation of the VVT as a responsiveness-detection parameter. In the abnormality determination, if the speed of change in angle of rotation ACSPD is less than a programmed determination value, it is determined that followup of VVT operation is faulty, and an abnormality-determination flag XVTFAIL is set to "1" to indicate that some abnormality has occurred. Also, a warning light is placed in an illuminated state. Target relative angle of rotation of the VVT is appropriately established, and VVT operation is suppressed on the basis of this abnormality determination. As a result, drivability and emissions performance degradation can be suppressed.

REFERENCES:
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patent: 5619976 (1997-04-01), Kitagawa et al.
patent: 5626108 (1997-05-01), Kato et al.
patent: 5644073 (1997-07-01), Matsuno et al.
patent: 5738053 (1998-04-01), Kato

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