Valve timing system for engine

An internal combustion engine having a combustion chamber, an induction system for delivering at least an air charge to said combustion chamber, said induction system comprising at least one intake valve for controlling the communication of said induction system with said combustion chamber in timed relationship to the engine output shaft, a throttle valve for controlling the flow of air through said induction system, and a flow control valve positioned in said induction system in proximity to said intake valve moveable from a first position for redirecting the flow charge into said combustion chamber and for restricting the flow into said combustion chamber under some running conditions to a second position wherein the flow into said combustion chamber is neither restricted nor redirected, and means for controlling the position of said flow control valve and said throttle valve so that when said flow control valve is moved from said second position towards said first position, said throttle valve is opened to a greater extent than necessary to control the engine speed.

An internal combustion engine having a combustion chamber, an induction system for delivering at least an air charge to said combustion chamber, an intake valve for controlling the communication of said intake passage with said combustion chamber, a variable valve timing mechanism for controlling the opening and closing of said intake valve in relation to an output shaft of said engine shaft and for varying the timing of opening and closing of said intake valve, an exhaust system for discharging a burnt charge from said combustion chamber, an exhaust valve for controlling the communication of said combustion chamber with said exhaust system, a variable valve timing mechanism for controlling the opening and closing of said exhaust valve in timed relationship to said engine output shaft and for varying the timing of opening and closing of said exhaust valve, said intake valve variable valve timing mechanism permitting adjustment of the beginning of opening of said intake valve to a range greater than 50.degree. of the engine output shaft angle, said variable valve timing mechanism for said exhaust valve permitting adjustment of the beginning of opening of said exhaust valve to a range that is less than 60.degree. of the engine output shaft angle.