Valve timing control apparatus for engine

Details Valve timing control apparatus for engine Valve timing control apparatus for engine

1994-09-06

1996-02-27

Lo, Weilun

Internal-combustion engines

Poppet valve operating mechanism

With means for varying timing

123 9015, F01L 134, F02D 1302

Patent

active

054940087

ABSTRACT:
A varying mechanism (VVT) for continuously varying the valve timing of an intake valve in a predetermined range is provided on a cam shaft in an engine. By controlling the VVT, the valve overlap period of the intake valve and an exhaust valve is continuously varied in a predetermined range, thus adjusting the amount of the internal EGR in combustion chambers. When determining that the operational load of the engine is small and intermediate based on the value of a manifold pressure, an electronic control unit (ECU) computes a target value for advancing the valve timing with respect to the rotational phase of a crankshaft based on a throttle angle, an engine speed, etc. The ECU also computes a limit value to restrict the target value in accordance with the value of the manifold pressure. When the target value is smaller than the limit value, the ECU controls the VVT based on the target value. When the target value is greater than the limit value, the ECU replaces the limit value with target value and controls the VVT based on this target value.

REFERENCES:
patent: 3714932 (1973-02-01), Meacham et al.
patent: 4117813 (1978-10-01), Yamashita et al.
patent: 5103780 (1992-04-01), Ishii
patent: 5133310 (1992-07-01), Hitomi et al.
patent: 5161497 (1992-11-01), Simko et al.
patent: 5222465 (1993-06-01), Sakamoto et al.

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