Variable valve control apparatus for engine and method thereof
AssigneeHitachi Unisia Automotive, Ltd.
InventorsMasayuki Saruwatari, Junichi Furuya, Toru Kitayama
Life of this patent
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Abstract
In a low rotation region of an engine, valve timing of two intake valves is advanced and also one of two exhaust valves is driven by means of a cam with valve lift lower than that of the other exhaust valve, to thereby set a valve overlap period within which only one of the two exhaust valves is opened.
Claims21
(US) A variable valve control apparatus for an engine provided with two intake valves and two exhaust valves for each cylinder, comprising:
- a variable valve mechanism that varies a lift characteristic of one of said two exhaust valves;
- an operating condition detector that detects an operating condition of said engine;
- and
- a control unit that receives a detection signal from said operating condition detector to control said variable valve mechanism,
- wherein said control unit controls said variable valve mechanism to set a valve overlap period within which only one of said two exhaust valves is opened, when the operating condition of the engine is a specific operating condition.
(DE) A variable valve control apparatus for an engine provided with two intake valves and two exhaust valves for each cylinder, comprising:
- a variable valve mechanism that varies a lift characteristic of one of said two exhaust valves;
- an operating condition detector that detects an operating condition of said engine;
- and
- a control unit that receives a detection signal from said operating condition detector to control said variable valve mechanism,
- said apparatus characterized in that
- said control unit controls said variable valve mechanism to set a valve overlap period within which only one of said two exhaust valves is opened, when the operating condition of the engine is a specific operating condition.
(US) A variable valve control apparatus for an engine provided with two intake valves and two exhaust valves for each cylinder, comprising:
- variable valve means for varying a lift characteristic of one of said two exhaust valves;
- operating condition detecting means for detecting an operating condition of said engine;
- and
- control means for controlling said variable valve means to set a valve overlap period within which only one of said exhaust valves is opened, when the operating condition of the engine detected by said operating condition detecting means is a specific operating condition.
(DE) A variable valve control apparatus for an engine provided with two intake valves and two exhaust valves for each cylinder, comprising:
- variable valve means for varying a lift characteristic of one of said two exhaust valves;
- and
- operating condition detecting means for detecting an operating condition of said engine,
- said apparatus characterized of further comprising;
- control means for controlling said variable valve means to set a valve overlap period within which only one of said exhaust valves is opened, when the operating condition of the engine detected by said operating condition detecting means is a specific operating condition.
(US) A variable valve control method for an engine provided with two intake valves and two exhaust valves for each cylinder, comprising the steps of:
- detecting an operating condition of said engine;
- and
- setting a valve overlap period within which only one of said exhaust valves is opened, when the operating condition of the engine is a specific operating condition.
(DE) A variable valve control method for an engine provided with two intake valves and two exhaust valves for each cylinder,
- said method characterized of comprising the steps of:
- detecting an operating condition of said engine;
- and
- setting a valve overlap period within which only one of said exhaust valves is opened, when the operating condition of the engine is a specific operating condition.
Dependencies are inferred from the claim text.