Valve control system of internal combustion engines

Claim 1

In a system for controlling a valve means in an internal combustion engine, which system comprises sensors for monitoring respective variables indicative of the operational state of the engine and generating respectively corresponding detection signals and a control unit operating in response to said detection signals to control the opening degree of said valve means in accordance with said operational state of the engine, the improvement comprising: detecting means for detecting the operational state of the engine and transmitting a corresponding detection signal; control quantity setting means for receiving said detection signal and choosing the basic control quantity of said valve means from the data stored in ROM; objective speed setting means for setting the objective speed of the engine in accordance with the cooling water temperature from said detecting means and generating its output signal; feedback correction quantity setting means for receiving the actual engine speed from said detecting means and said output signal from said objective speed setting means and setting a feedback correction quantity; valve control quantity setting means for setting the control quantity of said valve means in response to said detection signals and generating a first actuation signal in accordance with said control quantity; actuating means for actuating the valve means in response to said first actuation signal; clock oscillation means for generating a check signal shorter than the reaction time of said valve means; synthesizing means for synthesizing said check signal and said first actuation signal to generate a synthesized signal, which is converted by said actuating means into a second actuation signal and a valve actuation state determination signal as outputs, which are transmitted to said valve means; and valve actuation state decision means for detecting said valve actuation state determination signal and deciding the actuation state of said valve means.