Abstract: A fuel supplying system of an LPI engine is capable of improving performance of a fuel pump by decreasing suction pressure thereof. A fuel supplying system of an LPI engine may include a fuel tank storing fuel, a fuel pump feeding fuel supplied by the fuel tank to the engine through a fuel supplying line, and a fuel return line for returning fuel from the engine to the inside of the fuel tank. The fuel pump may be divided into a pump chamber and an operating chamber, and a vent hole is formed at a case of the fuel pump.

Abstract: A fuel vapor recirculation device may includes: a canister that is connected with a fuel tank through a vapor line and a purge line configured with a pressure control solenoid valve; a vapor control valve that is disposed on the vapor line and selectively connects the fuel tank and the canister corresponding to operation of an engine control unit; a vapor recirculation valve unit that is connected with the canister, receives fuel vapor from the canister, discharges the fuel vapor to the atmosphere or recirculates the fuel vapor to the canister, and supplies air to the canister; and a one-way check valve that is disposed between the purge line and the canister, wherein the one-way check valve supplies air to the vapor recirculation valve unit when a negative pressure is generated in the purge line.

Abstract: A fuel vapor recirculation device may includes: a canister that is connected with a fuel tank through a vapor line and a purge line configured with a pressure control solenoid valve; a vapor control valve that is disposed on the vapor line and selectively connects the fuel tank and the canister corresponding to operation of an engine control unit; a vapor recirculation valve unit that is connected with the canister, receives fuel vapor from the canister, discharges the fuel vapor to the atmosphere or recirculates the fuel vapor to the canister, and supplies air to the canister; and a one-way check valve that is disposed between the purge line and the canister, wherein the one-way check valve supplies air to the vapor recirculation valve unit when a negative pressure is generated in the purge line.

Abstract: Embodies of peripheral a wireless relay system apparatus and method for a multi-path interference removing using by same channel frequency is shown and described, which purpose of the present invention is to overcome extension of service coverage and a dead spot with amplifying same channel frequency, a problem in doing the relay, system wireless relay system was a same frequency interference of RF (Radio Frequency) output is become feedback radiating from tx antenna to rx antenna of the relay system, the wireless relay system apparatus and method effectively eliminates the same frequency interference so that it can ensure an additional system gain and easy to set up relatively to general same frequency relay system.

Abstract: A circuit for two-level/four-level frequency shift keying modulation, which may be used for a paging transmitter, is compatible with earlier two-level non-return to zero frequency shift keying modulation circuits and includes; a voltage leveling circuit for generating four voltage levels to selectively allow the two-level and four-level frequency shift keying modulation; a decoder for decoding the least significant bit and most significant bit data inputs to generate a decoded signal output; an analog switch for selecting the four voltage levels in accordance with the two-level or four-level frequency shift keying modulation, in response to the decoded signal; an adder for adding the selected voltage level to a reference voltage to generate a corresponding digital output voltage; an audio amplifier for amplifying an audio signal input; an input/filter selector for selecting the digital output voltage or the amplified audio signal in response to an input selection control signal and for selecting one of two fi