JPS594861Y2 - Motorcycles equipped with electronic fuel injection devices - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a two-wheeled motor vehicle equipped with an electronic fuel injection device that detects the amount of intake air and appropriately controls the amount of fuel injection.

The electronic fuel injection system installed in motorcycles consists of a fuel pump, computer unit, air flow meter, and a surge tank that absorbs intake pulsation and reduces the intake air flow measurement error of the air flow meter. In this case, there are problems in that it is difficult to secure an installation space, the overall arrangement is poor, and it is not possible to form a large surge tank.

This idea compactly compiles an electronic fuel injection device,
To provide a two-wheeled motor vehicle that has a good appearance and can have a large surge chamber (tank).

Hereinafter, embodiments of this invention will be described based on the drawings.

In FIG. 1, 1 is a vehicle frame, 2 is a front wheel, 3 is a rear wheel, and 4 is an engine body. A dummy tank 7 is located between a seat 5 on the engine body 4 and a steering head 6.
is located.

The dummy tank 7 has almost the same shape as a conventional fuel tank,
The internal space is divided into a surge chamber 9 and a device storage chamber 10 with a partition wall 8 in between, as shown in FIG.

Inside the device storage chamber 10 is a fuel pump 11 for an electronic fuel injection device. A fuel measuring section and an air measuring section such as an air flow meter 12 and a computer unit 13 are arranged.

Further, a second intake pipe 18 including a fuel injector 16 and a slot valve 17 is provided between the bottom of the surge chamber 9 and each engine cylinder 15.

19 penetrates the surge chamber 9 and the rear end 2 of the dummy tank 7
14 is an air cleaner attached to the outside of the dummy tank 7;
21 is a fuel tank placed on the rear wheel 3.

In the above configuration, when the engine starts, the air passes through the air cleaner 14, the first intake pipe 19, the device storage tank 10, the air flow meter 12, the surge tank 9, and the second intake pipe 18 in order, and then enters the engine cylinder from outside the dummy tank 7. 15
air is inhaled.

At this time, the air flow meter 12 is activated, and the amount of intake air into the engine cylinder 15 is detected by the air flow meter 12. Based on the detected amount, the computer unit 13 operates, and the amount of air taken into the engine cylinder 15 from the fuel injector 16 is controlled. The injection amount is controlled.

Further, the intake pulsation is absorbed in the surge chamber 9, and the error in measuring the intake air amount by the air flow meter 12 is suppressed to a small level.

In addition, if the fuel is placed in the fuel tank 21 above the rear wheel 3, which is spaced backward from the engine body 4 as in this example, it will not easily catch fire even if a fall accident occurs, and it will be effective as a countermeasure against transpiration. is also advantageous.

As described above, according to this invention, a dummy tank is placed in a location where a relatively large space can be obtained, that is, between the seat on the engine body and the steering head, with the internal space divided into a surge chamber and a device storage chamber. Therefore, this dummy tank, or surge chamber, can be made large.

Further, since the fuel pump, air flow meter, and computer unit of the electronic fuel injection device are arranged in the device storage chamber, the fuel injection device including the intake system can be compactly made and have a good appearance.

[Brief explanation of the drawing]

FIG. 1 is a side view of a two-wheeled motor vehicle according to an embodiment of the invention, and FIG. 2 is a plan view showing the internal structure of a dummy and a tank. 4... Engine body, 5... Seat, 6... Steering head, 7... Dummy tank, 9... Surge chamber, 10... Device housing chamber, 11... Fuel pump,
12... Air flow meter, 13... Computer unit, 14... Air cleaner, 15... Engine cylinder, 18... Intake pipe, 21... Fuel tank.

Claims (1)

[Scope of utility model registration request] A dummy tank with an internal space divided into a surge chamber and a device storage chamber that can take in air from the outside is placed between the seat on the engine body and the steering head, and a fuel pump for an electronic fuel injection system and an air flow meter are installed in the device storage chamber. In addition to arranging a fuel metering section and an air metering section such as a computer unit, an intake pipe is provided between the surge chamber and the engine cylinder, and the air flow meter detects the amount of intake air into the engine cylinder, and based on the detected amount, the A two-wheeled motor vehicle equipped with an electronic fuel injection device that controls the amount of fuel injected using a computer unit.