System for Controlling Variable Valve

Abstract

A system for controlling variable valve includes a crank angle sensor detecting an angle of a crankshaft, an engine control unit (ECU) (ECU) outputting a control signal to the intake and exhaust valves by receiving a sensing signal from the crank angle sensor, a control portion transmitting the signal input from the engine control unit (ECU), a first valve comprising a first actuator controlling the intake valve and a second valve comprising a second actuator controlling the exhaust valve wherein each actuator receives the signal from the control portion, a pressure supply unit supplying pressure to the first and second valves, and first and second sensors detecting positions of the actuators, wherein the control portion compensates the operation error of actuators by receiving the feedback signal from the first and second sensors. By controlling variable valve, the intake and exhaust valves may be precisely controlled and fuel consumption can be improved.

1 . A system for controlling variable valve controlling intake and exhaust valves of an engine comprising:
 a crank angle sensor detecting an angle of a crankshaft;   an engine control unit outputting a control signal to control the intake and exhaust valves by receiving a sensing signal from the crank angle sensor;   a control portion transmitting the control signal input from the engine control unit (ECU);   a first valve comprising a first actuator opening and closing the intake valve by receiving a signal from the control portion;   a second valve comprising a second actuator opening and closing the exhaust valve by receiving a signal from the control portion;   a pressure supply unit supplying pressure to the first and second valves; and   first and second sensors detecting positions of the first and second actuators,   wherein the control portion compensates position errors of the first and second actuators by receiving feedback signal from the first and second sensors.   
   
   
       2 . The system of  claim 1 , further comprising at least a waveform generator transforming the control signal input from the engine control unit (ECU). 
   
   
       3 . The system of  claim 1 , further comprising:
 a first amplifier unit amplifying the signal transmitted from the control portion; and   a second amplifier unit amplifying the feedback signal transmitted from the first and second sensors.   
   
   
       4 . The system of  claim 1 , wherein the first and second sensors are realized as Differential Transformer (DTF) sensor. 
   
   
       5 . The system of  claim 1 , wherein the engine control unit (ECU) outputs the control signal on the basis of a clock signals input from outside.