JP2009262907A - Detection of residual fuel of bi-fuel engine, and automatic fuel change device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To automatically switch fuel to gasoline or the like as one more fuel when a residual quantity of LPG in a tank is reduced in operation by using LPG as one fuel of a bi-fuel engine. <P>SOLUTION: There is shown a system constitution drawing of automatic fuel switching in which a pressure meter for measuring the inner pressure of a LPG tank is installed. When the inner pressure of the LPG tank is lowered to predetermined pressure or lower, the pressure meter 10 transmits a signal to an automatic fuel switching instruction device 9. The automatic fuel change instruction device 9 which has received the signal transmits a closing signal to a LPG supply valve 6 so as to stop the supply of LPG, and at the same time, transmits an opening signal to a gasoline supply valve 5 so as to start the supply of gasoline. A display lamp 8 informs a driver by lighting indication of gasoline. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  In motorcycles or motorbikes, two types of engines can be used, such as gasoline and LPG or bioethanol and LPG, and the fuel is switched from LPG to gasoline or LPG to bioethanol while driving. Field.

  The problem of removing NOx, SOx, and soot in exhaust gas while running an engine using gasoline as a fuel has been addressed as a major technical issue. Among them, an engine using LPG as fuel has made a great progress in that it does not contain NOx, SOx, smoke, etc. in the exhaust gas.

  Engine fuel cost is an important indicator of engine performance as fuel efficiency. Among them, a diesel engine using light oil is a representative example of a fuel that changes fuel itself to improve fuel efficiency. On the other hand, LPG is known as a fuel that is driven by using a gasoline engine as it is, and it is also well known that it is significantly cheaper than gasoline due to a difference in production process from petroleum.

  However, LPG supply stations are less than gasoline. Therefore, running out of LPG fuel creates anxiety during operation.

  This is a problem of automatically switching to another fuel such as gasoline when the remaining amount of LPG tank is reduced while operating with one LPG fuel of the bi-fuel engine.

  FIG. 1 is a block diagram of a system for manually switching fuel. When the lever 1 is manually operated, the LPG supply valve 6 is closed, the gasoline supply valve 5 is opened, and the fuel is switched from LPG to gasoline.

  FIG. 2 shows a configuration diagram of a system in which a sensor that emits an electronic signal with a predetermined remaining amount is installed in a fuel gauge of a tank.

  The fuel gauge 7 incorporates a remaining amount sensor. A signal is issued to the automatic fuel switching instruction device 9 with a predetermined remaining amount.

  Receiving the signal, the automatic fuel switching instruction device 9 issues a close signal to the LPG supply valve 6 to stop the LPG supply. At the same time, an open signal is issued to the gasoline supply valve 5 to start supplying gasoline. A gasoline display is lit on the indicator lamp 8 to notify the driver.

  [FIG. 3] is a system configuration diagram of automatic fuel switching equipped with a pressure gauge for measuring the internal pressure of the LPG tank.

  The pressure gauge 10 issues a signal to the automatic fuel switching instruction device 9 when the internal pressure of the LPG tank falls below a predetermined pressure.

  Receiving the signal, the automatic fuel switching instruction device 9 issues a close signal to the LPG supply valve 6 to stop the LPG supply. At the same time, an open signal is issued to the gasoline supply valve 5 to start supplying gasoline. A gasoline display is lit on the indicator lamp 8 to notify the driver.

  In order to use LPG fuel positively for economic operation and clean exhaust gas operation, liquid fuel such as gasoline is installed as a reserve. Since there are few LPG supply stands, even if there is no LPG, it will continue to run automatically with spare ganlin, so it can be operated without worry.

  Even if there is no LPG supply station and it is necessary to travel as it is with gasoline, it is possible to continue traveling with the supply of gasoline at the gas station by providing a spare gasoline tank.

BEST MODE FOR CARRYING OUT THE INVENTION

  FIG. 4 shows an electronic circuit configuration diagram of an embodiment that operates by detecting the internal pressure of the LPG tank with a pressure gauge.

  The internal pressure detector 10 sends LPG tank internal pressure data to the comparison determination unit 12.

  Compare with a preset reference value 11.

  When the tank internal pressure data falls below the reference value, the automatic fuel switching instruction device 9 operates to issue a close signal to the LPG supply valve 6 and stop the supply of LPG. At the same time, an open signal is sent to the gasoline supply valve 5 to start supplying gasoline.

  Switching fuel manually   The fuel level of the tank is detected electronically and the fuel is automatically switched.   Detects tank internal pressure and automatically switches fuel   Electronic circuit configuration that operates by detecting internal pressure

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Manual switch 2 Gasoline tank 3 LPG tank 4 Engine 5 Gasoline supply valve 6 LPG supply valve 7 Fuel meter 8 Indicator light 9 Fuel automatic switching instruction | indication device 10 Pressure gauge 11 Reference value 12 Comparison discrimination

Claims (4)

An automatic fuel switching device for a motorcycle or a motorbike that automatically switches fuel by using gasoline and LPG or bioethanol and LPG as fuel for the engine. 2. The fuel automatic operation according to claim 1, wherein a signal is issued when the remaining amount of LPG during running in the LPG is equal to or less than a set value, and another fuel gasoline supply valve is opened to switch to driving gasoline or the like, and the LPG supply valve is closed. Switching device. 2. The automatic fuel switching device according to claim 1, further comprising an indicator such as a floating type that indicates the remaining amount of LPG in the fuel tank that emits a constant signal in accordance with the remaining amount. 2. The automatic fuel switching device according to claim 1, wherein an indicator signal indicating the LPG remaining amount of the fuel tank can be arbitrarily set with respect to the remaining amount.

Images