| 摘要 |
PURPOSE: An interface apparatus is provided to allow for combined use of the vehicle engine for gasoline and gas without causing changes of the gasoline engine controller. CONSTITUTION: An interface apparatus comprises an analog input unit(303) for receiving, in an analog signal, an ignition key input signal and a fuel pressure signal of a liquefied gas; a digital input unit(305) for receiving a fuel injection signal of a gasoline engine from an ECU; a flash memory(317) for storing fuel injection time calculation information for generating a gas injection signal on the basis of the fuel injection signal of the gasoline engine input from the digital input unit, and a solenoid control logic in accordance with the specification of the solenoid of the gas injection; an injection driver(309) for distributing liquefied gas injection control signals to each gas injector; an auxiliary injection driver(307) for modulating a pulse width modulation signal to the output signal of the injection driver so as to control the current flowing at the coil of the gas injector; a pump driver(311) for providing a pump control signal for maintaining the gas fuel at a liquid state; and a central processing unit(301) for receiving the ignition key signal from the analog input unit, starting a system, perceiving the current fuel pressure value by converting the fuel pressure signal into a digital signal, outputting an injector driving signal to the injection driver, calculating an injector driving time in accordance with the specification of the gas injector and characteristics of gas fuel, and providing a control signal for generating pulses to the auxiliary injection driver.
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