Patent ID: 9638135
Date: 2017-05-02
CPC Classifications: F02M,F16K,Y02T

Claim:
1. A fuel system, comprising: a carburetor having a fluid passage; a solenoid; a valve moved by the solenoid between an open position permitting fluid flow through the fluid passage and a closed position at least partially inhibiting fluid flow through the fluid passage; and a driver circuit communicated with the solenoid to contribute to providing power to the solenoid and controlling actuation of the solenoid; the driver circuit and a control circuit provide a first magnitude of power to the solenoid to initially change the valve from its closed position to its open position and a second magnitude of power to the solenoid to maintain the valve in its open position wherein the second magnitude of power is less than the first magnitude of power; and the control circuit provides a first pulse width modified (PWM) profile with a duty cycle greater than 50% corresponding to the first magnitude of power and a second PWM profile with a duty cycle less than 50% corresponding to the second magnitude of power.