Variable valve timing controller for an engine
AssigneesMitsubishi Jidosha Kogyo Kabushiki Kaisha, Mitsubishi Jidosha Engineering Kabushiki Kaisha
InventorsHideo Nakai, Katsuhiko Miyamoto, Yoshiyuki Hoshiba, Katsuyuki Maeda, Seiji Shiota
Life of this patent
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Abstract
A variable valve timing controller includes an intake-valve and an exhaust-valve. When the engine is started, the intake-valve and the exhaust-valve are operated in a first mode in which the exhaust-valve is closed before top dead center and then the intake-valve is opened. When a first predetermined condition is met, the intake-valve and the exhaust-valve are operated in a second mode in which the opening time of the intake-valve in the first mode is advanced before top dead center.
Claims8
A variable valve timing controller for controlling operation of an intake-valve and an exhaust-valve equipped with an engine, comprising:
- a valve-over-lap setting controller for setting an operation mode for lift timing of said intake-valve and exhaust-valve;
- and
- a variable valve timing mechanism controller for operating said intake-valve and said exhaust-valve individually according to the operation mode set by said valve-over-lap setting controller, wherein
- said valve-over-lap setting controller sets the operation mode to a first mode when the engine is just started, and
- if a first predetermined condition is met after the first mode is set then
- said valve-over-lap setting controller resets the operation mode from the first mode to a second mode,
- wherein, said valve-over-lap setting controller sets the first mode, which instructs said variable valve timing mechanism controller so that at least one-half of a period, from the closing time of said exhaust-valve to the opening time of said intake-valve, is set during an exhaust stroke of the engine.
Dependencies are inferred from the claim text.