Variable valve timing arrangement for internal combustion engine
First Claim
1. An internal combustion engine comprising a combustion chamber defined by a cylinder defining a cylinder bore, a piston reciprocating in said cylinder bore, and a cylinder head closing said cylinder bore, intake port means for supplying a charge to said combustion chamber, an intake valve for controlling the timing of opening and closing of said intake port means in timed relation to the position of said piston in said cylinder bore and for a fixed duration, exhaust port means for discharging a burnt charge from said combustion chamber, an exhaust valve for controlling the timing of opening and closing of said exhaust port means in timed relation to the position of said piston in said cylinder bore and for a fixed duration, means for sensing a condition of said engine indicative of a condition when knocking may occur, and means for varying the timing of both the opening and closing of at least one of said valves in response to the sensed signal in the same direction and in the same amount so as not to alter the fixed duration of said one valve to preclude knocking by controlling the amount of intake air charge transferred back into said intake port means when said piston is moving toward top dead center.
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Accused Products
Abstract
Several embodiments of valve timing control for internal combustion engines so as to improve the engine performance in response to sensed characteristics. In addition, the valve timing is also changed either to avoid knocking in incipient knocking conditions or to stop knocking once it has occurred. Both normally aspirated and supercharged versions are described.
52 Citations
26 Claims
- 1. An internal combustion engine comprising a combustion chamber defined by a cylinder defining a cylinder bore, a piston reciprocating in said cylinder bore, and a cylinder head closing said cylinder bore, intake port means for supplying a charge to said combustion chamber, an intake valve for controlling the timing of opening and closing of said intake port means in timed relation to the position of said piston in said cylinder bore and for a fixed duration, exhaust port means for discharging a burnt charge from said combustion chamber, an exhaust valve for controlling the timing of opening and closing of said exhaust port means in timed relation to the position of said piston in said cylinder bore and for a fixed duration, means for sensing a condition of said engine indicative of a condition when knocking may occur, and means for varying the timing of both the opening and closing of at least one of said valves in response to the sensed signal in the same direction and in the same amount so as not to alter the fixed duration of said one valve to preclude knocking by controlling the amount of intake air charge transferred back into said intake port means when said piston is moving toward top dead center.
- 14. A method for operating an internal combustion engine comprising a combustion chamber defined by a cylinder defining a cylinder bore, a piston reciprocating in said cylinder bore, and a cylinder head closing said cylinder bore, intake port means for supplying a charge to said combustion chamber, an intake valve for controlling the timing of opening and closing of said intake port means in timed relation to the position of said piston in said cylinder bore and for a fixed duration, exhaust port means for discharging a burnt charge from said combustion chamber, an exhaust valve for controlling the timing of opening and closing of said piston in said cylinder bore and for a fixed duration, said method comprising the steps of sensing a condition of said engine indicative of a condition when knocking may occur, and varying the timing of both the opening and closing of at least one of said valves in the same direction and in the same amount in response to the sensed condition without changing the fixed duration to preclude knocking by controlling the amount of intake air charge transferred back into said intake port means when said piston is moving toward top dead center.
Specification