Valve timing control device for an internal combustion engine
First Claim
1. A valve timing control device for changing a valve timing of one of an intake valve and an exhaust valve of an engine, comprising:
- valve variable means for changing a valve overlap amount from an opening of the intake valve to a closing of the exhaust valve of a cylinder of the engine;
means for detecting operating conditions of the engine;
control means for controlling an operating amount of said valve variable means in accordance with the engine operating conditions;
fuel property detection means for detecting a property of fuel burned in the engine; and
operating amount correction means for the control means for correcting a control amount of said control means in accordance with the fuel property detected by said fuel property detection means.
1 Assignment
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Accused Products
Abstract
An engine valve timing control device is disclosed, in which the valve overlap amount is controlled according to the fuel property, thereby keeping the drivability unchanged even when the fuel is changed. A shortage of engine output and cold hesitation are prevented at the same time when the engine temperature is low. The device is for controlling the valve operation characteristic of an internal combustion engine, and comprises a variable valve mechanism capable of changing the valve overlap amount and a control unit for controlling the operating amount of the variable valve mechanism in accordance with the engine operating conditions. The property of the fuel burnt in the engine is determined as light, intermediate or heavy. Under the engine operating condition where the overlap amount otherwise is the same, the operating characteristic of the intake valve and the exhaust valve is controlled in such a manner that the overlap amount of the intake valve or the exhaust valve is smaller for the intermediate fuel than for the light fuel and smaller for the heavy fuel than for the intermediate fuel. Also, the control of the valve overlap amount can be corrected in accordance with the engine temperature.
106 Citations
10 Claims
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1. A valve timing control device for changing a valve timing of one of an intake valve and an exhaust valve of an engine, comprising:
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valve variable means for changing a valve overlap amount from an opening of the intake valve to a closing of the exhaust valve of a cylinder of the engine; means for detecting operating conditions of the engine; control means for controlling an operating amount of said valve variable means in accordance with the engine operating conditions; fuel property detection means for detecting a property of fuel burned in the engine; and operating amount correction means for the control means for correcting a control amount of said control means in accordance with the fuel property detected by said fuel property detection means. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A valve timing control device for controlling operation of one of an intake and exhaust valve of an engine, comprising:
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valve variable means for changing a valve overlap amount from an opening of the intake valve to a closing of the exhaust valve; means for detecting operating conditions of the engine; control means for determining a valve overlap amount based on the engine operating conditions and for controlling the valve variable means to achieve the determined valve overlap amount; fuel property detection means for detecting a property of fuel burned in the engine; and operating amount limiting means for limiting a degree of control of the control means in accordance with the fuel property detected by the fuel property detecting means.
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Specification