JPH0447393Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a fuel injection amount control device for a vehicle internal combustion engine equipped with an exhaust turbo supercharger.

[Prior Art] In the fuel injection amount control device for a supercharged engine for a vehicle disclosed in Japanese Utility Model Application Publication No. 55-125930, an actuator is connected to a boost compensator provided in a fuel injection pump, and only when the engine is started. Pressurized air is supplied from the air tank to the actuator, the actuator rod drives the boost compensator rod, and the boost compensator rod rotates the supercharging lever, allowing the fuel control rod to move in the direction of fuel increase. It's becoming like that.

In the above-mentioned fuel injection amount control device, the cost is high because the actuator is connected to the boost compensator, and the actuator does not operate when the engine is accelerating, so it is possible to improve the accelerating performance of the engine when the vehicle starts. It's not a thing.

[Problems to be solved by the invention] In view of the above-mentioned problems, the purpose of the invention is to have a simple configuration, and to provide boost boost by directly sending pressurized air from an air tank, which is always available in large vehicles, to the boost compensator. An object of the present invention is to provide a fuel injection amount control device for a supercharged engine for a vehicle, which forcibly operates a compensator and improves the acceleration performance of the engine.

[Means for Solving the Problem] In order to achieve the above object, the configuration of the present invention selects either the supercharger or the air tank for the working chamber of the boost compensator that regulates the maximum fuel injection amount of the fuel injection pump. Provide a solenoid switching valve that connects to
A switch that closes when the transmission is in the starting gear is inserted and connected to the energizing circuit of the electromagnetic switching valve, and when the electromagnetic switching valve is energized, the air tank is communicated with the operating chamber of the boost compensator.

[Function] When the vehicle is started, when the shift lever of the transmission is set to the starting gear (first gear or second gear), the energizing circuit of the electromagnetic switching valve is closed, and the electromagnetic switching valve operates to open the air tank. is communicated to the operating chamber of the boost compensator. Therefore, the supercharging lever is rotated by the boost compensator, the regulation of the supercharging lever that limits the maximum fuel injection amount of the fuel control lever is released, and the fuel control lever 17 is rotated in accordance with the amount of depression of the accelerator pedal. can be moved in the direction of increasing fuel, and the acceleration performance of the engine is improved.

[Embodiment of the invention] As shown in FIG. 1, in a fuel injection pump equipped with a mechanical speed governor, a centrifugal weight 3 is supported on a camshaft 2, and the shifter 5 is set to idle by the expanding movement of the centrifugal weight 3. It is adapted to be pushed to the left against the force of the spring 6. The shifter 5 is supported by the lower end of a guide lever 4 rotatably supported by a support shaft 12 in a case (not shown). A tension lever 11 is rotatably supported by a support shaft 12 independently of the guide lever 4, and is normally supported by a regulating spring 10.
1 is abutted against a stopper 33 disposed on the case. The above-mentioned idle spring 6 is interposed between the tension lever 11 and the shifter 5.

The intermediate portion of the floating lever 9 is connected to the intermediate portion of the guide lever 4 by a pin 13. The lower end of the floating lever 9 is coupled to the rotation shaft 7 supported by the case described above. When the control lever 8 connected to the rotation shaft 7 is connected to the accelerator pedal and the floating lever 9 is rotated clockwise about the rotation shaft 7, the fuel control rack 17 is pushed to the right, and the fuel injection amount is is increasing. A spring 14 is stretched between the upper end of the floating lever 9 and the case, and the spring 14 urges the floating lever 9 to the right.
Such a configuration is almost similar to a conventional fuel injection pump.

According to the present invention, the upper end of the floating lever 9 and the fuel control rack rod 17 are connected to be movable within a predetermined range. That is, a slit 18 is connected to the rod 16 connected to the fuel control rack rod 17 by a pin.
A cylindrical body 15 having a projection 19 is connected to the upper end of the floating lever 9 by a pin, and a spring 20 is interposed between the sliding body 31 and the cylindrical body 15. The protrusion 19 is the cylindrical body 1
5 into the slit 18.

Engagement member 21 coupled to fuel control rack 17
A supercharging lever 40 that engages with the fuel control lever 17 to restrict the movement of the fuel control rack rod 17 in the fuel increasing direction is supported at its upper end by a support shaft 26 in the case of the fuel injection pump, and by a pin 23 at its middle portion by a boost compensator. 32 rods 24. The boost compensator 32 includes an operating chamber 28 and an atmospheric chamber 27 inside a cylinder 34, which are partitioned by a diaphragm. When the boost pressure (intake pressure supplied from the supercharger 48 to the intake manifold of the engine) applied to the engine 28 causes the supercharging lever 40 to be pushed out of the atmospheric chamber 27, the supercharging lever 40 is rotated, and the fuel control lever 17 is rotated.
It is designed to allow movement in the direction of increasing fuel.

The lower end of the supercharging lever 40 is connected to the actuator 32
The maximum operating position of the boost compensator 32 is limited by a stopper 50 screwed into the case.

According to the present invention, the boost compensator 32
Normally, a pipe 51 connected to the working chamber 28 of the supercharger 48 is connected to a pipe 52 connected to the outlet of the compressor of the supercharger 48 via the electromagnetic switching valve 46. The electromagnetic switching valve 46 is switched, and the pipe 51 is connected to the air tank 47.
It is configured to be connected to 3.

As shown in FIG. 2, a temperature switch 42 closes when the temperature of the lubricating oil or cooling water of the engine is below a predetermined value.
and a switch 44 that is closed when the gear shift lever 55 is in the first gear are inserted and connected in parallel to the energizing circuit of the electromagnetic switching valve 46.

Next, the operation of the device of the present invention will be explained. When starting the vehicle, move the gear lever 55 of the transmission 43 to the first position.
When the gear is operated, the switch 44 is closed, the electromagnetic switching valve 46 is switched to the position where the pipe 51 is connected to the pipe 53, the pressurized air in the air tank 47 is supplied to the working chamber 28, and the rod 24 of the boost compensator 32 is As a result, the supercharging lever 40 is pushed to the right against the force of the spring 25, and the fuel control rack 17 can be moved in the fuel increasing direction by that amount.

Therefore, when the accelerator pedal is fully depressed, the floating lever 9 is rotated clockwise about the rotation shaft 7, and the sliding body 31 compresses the spring 20 while moving the fuel control lever 17 in the fuel increasing direction. The acceleration performance of the engine is improved.

If the starting performance of the vehicle in cold weather is the only issue, the signal from the switch 42 or temperature sensor, which operates when the temperature of the lubricating oil or cooling water of the engine is below a predetermined value, and the shift lever of the transmission 43 are used. 55
The electronic control device 4 is based on a signal from a switch 44 or a shift position sensor that operates when the is in the first gear.
The electromagnetic switching valve 46 may be configured to be switched to a position where the piping 51 is connected to the piping 53 by the output No. 5.

[Effects of the invention] As mentioned above, the invention provides an electromagnetic switching valve that selectively connects either the supercharger or the air tank to the operating chamber of the boost compensator that regulates the maximum fuel injection amount of the fuel injection pump. A switch that closes when the transmission is in the starting gear is inserted and connected to the energizing circuit of the electromagnetic switching valve, so that when the electromagnetic switching valve is energized, the air tank is communicated with the operating chamber of the boost compensator. When the engine accelerates when the vehicle starts, the electromagnetic switching valve operates, and the pressurized air in the air tank is sent to the boost compensator, and the supercharging lever restricts the movement of the fuel control rod in the direction of increasing fuel. Since the restriction effect is released, the fuel control lever can be moved in the direction of increasing fuel in accordance with the amount of depression of the accelerator pedal, and the acceleration performance of the engine is improved.

According to the present invention, when the engine accelerates when the vehicle starts, pressurized air from the air tank is directly supplied to the boost compensator, and the boost compensator drives the supercharging lever.
No separate actuator is required to drive the supercharging lever, resulting in cost savings.

Since the air tank can be connected to the boost compensator via the electromagnetic switching valve without making any changes to the conventional boost compensator, the configuration is simple, the number of parts is small, and costs are also reduced in this respect.

[Brief explanation of the drawing]

FIG. 1 is an overall configuration diagram of a fuel injection amount control device for a supercharged engine according to the present invention, and FIG. 2 is an electric circuit diagram of the same fuel injection amount control device. 17... Fuel control rack lever, 21... Engaging member, 28... Working chamber, 32... Boost compensator, 40... Supercharging lever, 44... Switch, 46... Solenoid switching valve, 47... Air tank,
48...Supercharger.

Claims (1)

[Scope of utility model registration request] An electromagnetic switching valve that selectively connects either the supercharger or the air tank is installed in the operating chamber of the boost compensator that regulates the maximum fuel injection amount of the fuel injection pump, and a switch that closes when the transmission is in the starting gear is installed. By inserting and connecting to the energizing circuit of the electromagnetic switching valve, the electromagnetic switching valve is energized when the vehicle starts and accelerates.
A fuel injection amount control device for a supercharged engine for a vehicle, characterized in that an air tank is communicated with an operating chamber of a boost compensator.