Abstract: A throttle body fixing structure adapted to firmly fix a throttle body to the engine under a simple structure, wherein the throttle body connects to a surge tank made of a plastic material. The vehicle weight is reduced, and maintenance and assembly are simplified. Furthermore, noise and vibration are minimized and the durability is increased.

Abstract: A fuel drain structure in a fuel line comprising a bypass channel for connecting a fuel influx side and a fuel efflux side of a regulator, and a rotary valve for opening and closing the bypass channel, contributing to a prevention of fuel remaining in the fuel line from entering the engine when the engine stops running, and minimization of pollution occurring when the engine is re-started.

Abstract: A Liquefied Petroleum Injection (LPI) fuel pump diagnosis system for determining the operation state of a fuel pump by analyzing a signal inputted from a fuel pump driver of an LPG tank into an interface box, including a fuel pump relay that provides power to the fuel pump and cut-off solenoid valves, an LPG switch that allows a user to isolate the fuel supply, a voltage detector disposed in the interface box that detects a voltage between the LPG switch and the fuel pump relay by being connected to a signal line that connects the LPG switch and fuel pump relay, and an ECU of the interface box that determines whether a signal line connecting the fuel pump driver and interface box is disconnected by determining whether the LPG switch is on or off through analysis of the voltage detected via the voltage detector.

Abstract: A method for diagnosing a Liquefied Petroleum Injection fuel pump includes the steps of: inputting an engine Revolutions Per Minute (RPM) and a fuel pump Pulse Width Modulation (PWM) signal into an Electronic Control Unit (ECU) of an interface box; determining whether the RPM indicates that the engine is idling; if the engine is not idling, setting a diagnosis time of the PWM signal to a duration longer than the time the engine takes to deactivate after turning off an LPG switch; determining the operation state of the fuel pump by analyzing the PWM signal; and illuminating a warning lamp if the fuel pump is detected to be operating abnormally or a signal line connecting the fuel pump and the interface box is detected to be disconnected.

Abstract: A fuel pump noise-reduction apparatus in a Liquefied Petroleum Injection (LPI) vehicle comprises a Liquefied Petroleum Gas (LPG) switch. A plurality of shut off valves are configured for activation upon stoppage of battery power via the LPG switch. A fuel pump in a fuel tank is configured for activation upon stoppage of battery power via the LPG switch. The shut off valves close and the fuel pump stops simultaneously when the LPG switch is deactivated, contributing to a reduction in noise and engine output consumption due to unnecessary operation of the fuel pump when the engine stops.

Abstract: A fuel pump noise reducing apparatus and a methods for a Liquefied Petroleum Injection (LPI) vehicle stops fuel provision by shutting off valves if a Liquefied Petroleum Gas (LPG) switch is turned off. Also, operation of a fuel pump is stopped by allowing an Interface Box (IFB) Electronic Control Unit (ECU) to turn off a relay and by insulating battery power provided to the fuel pump, thereby resulting in a reduction of noise and engine output consumption generated from unnecessary operation of the fuel pump.

Abstract: A belt tensioner comprises first and second pulleys, a main arm and a sub-arm. The first pulley is displacable relative to an engine, and the second pulley is displacable relative to the first pulley. The main arm is connected to the first pulley, and a first spring is connected to the main arm and resists displacement of the first pulley when the engine is started. The sub-arm is connected to the second pulley, and a second spring is connected between the main arm and the sub-arm and maintains the second pulley generally equidistant from the first pulley while the engine is running.

Abstract: Variable intake systems are provided that include a variable intake valve shaft, potentiometer, pneumatic actuator, Manifold Absolute Pressure sensor, Throttle Position Sensor and controller. Preferred systems of the invention can monitor whether valves of a variable intake system are properly working, thereby stabilizing the operation of the variable intake system in a simplified manner and at low costs.

Abstract: An apparatus for inducting air for an engine is disclosed wherein noise that occurs when intake air flowing through a bypass passage is confluent with intake air drawn from a main passage while the idle speed control actuator is operated is reduced. The apparatus also includes a chamber for temporarily preserving the intake air such that the revolution speed and output power of the engine can be stabilized. In one embodiment a throttle body has a main passage formed therethrough. A throttle valve is mounted in the main passage and a bypass passage bypasses the throttle valve. A surge tank is connected with the throttle body to receive intake air from the throttle body, and the bypass passage extends to the surge tank. The surge tank is provided with a chamber connected to the bypass passage.

Abstract: A fuel drain structure in a fuel line comprising a bypass channel for connecting a fuel influx side and a fuel efflux side of a regulator, and a rotary valve for opening and closing the bypass channel, contributing to a prevention of fuel remaining in the fuel line from entering the engine when the engine stops running, and minimization of pollution occurring when the engine is re-started.

Abstract: An apparatus for inducting air for an engine is disclosed wherein noise that occurs when intake air flowing through a bypass passage is confluent with intake air drawn from a main passage while the idle speed control actuator is operated is reduced. The apparatus also includes a chamber for temporarily preserving the intake air such that the revolution speed and output power of the engine can be stabilized. In one embodiment a throttle body has a main passage formed therethrough. A throttle valve is mounted in the main passage and a bypass passage bypasses the throttle valve. A surge tank is connected with the throttle body to receive intake air from the throttle body, and the bypass passage extends to the surge tank. The surge tank is provided with a chamber connected to the bypass passage.