JPS5960038A - Apparatus for controlling supply rate of fuel - Google Patents

Abstract

PURPOSE:To enable to achieve constant-speed operation and economical operation of an engine by use of a simple mechanism, by forming a gear at a part of a load lever for controlling the supply rate of fuel, and turning the load lever through the gear engagement by use of a motor which is controlled by a computor. CONSTITUTION:A load lever 10 fo controlling the supply rate of fuel is connected to the accelerator pedal via an accelerator cable 11, and its gear part 16 is held in mesh with a pinion 18 fixed to a step motor 17 which is controlled by a computer. By thus controlling rotation of the step motor 17 by a computor, it is enabled to achieve constant-speed operation and economical operation of an engine.

Description

Detailed Description of the Invention The present invention supplies fuel sequentially from a fuel injection pump to each cylinder of an engine, and controls the amount of fuel supplied by rotating a load lever of a mechanical governor provided on the fuel injection pump. The present invention relates to a fuel supply amount control device.

A diesel engine is equipped with a fuel injection pump that sequentially supplies fuel to each cylinder of the engine. The amount of fuel supplied by the fuel injection pump is controlled by the load lever, which is connected to the accelerator pedal via the accelerator cable, and controls the control rack of the fuel injection pump via the mechanical governor attached to the fuel injection pump. This was done by moving. Conventional control of the amount of fuel supplied by a fuel injection pump using the accelerator pedal is inferior in terms of accuracy, and
It is not possible to carry out various complicated controls such as constant speed running and economical running, and as a result, the engine has the disadvantage of not being able to fully utilize its functions.

In order to overcome these drawbacks, attempts have been made to control the supply of fuel using an electronic control device such as a microcomputer. In carrying out such control, the control rack of the fuel injection pump is moved via various actuators in response to control signals from an electronic control device. On the contrary, for example, using a normal motor as an accelerator,
In order to move the Lurak, the rotational motion must be converted into linear motion, which has the disadvantage of complicating the mechanism. In addition, when electronic control and control by a mechanical governor are used together, and both are used selectively, there is a drawback that the connection mechanism between the actuator and the control rack is roughly multi-layered.

The present invention has been made in view of these problems, and an object of the present invention is to provide a device that can perform complex fuel supply control using a simple mechanism. be.

An embodiment in which the present invention is applied to a fuel supply control device for a vehicle diesel engine will be described below with reference to the drawings.

As shown in FIG. 1, a fuel injection pump 2 is attached to a side surface of a diesel engine 1. The fuel injection pump 2 is driven by cams fixed to cam shirts 1 to 5, which are rotated by the rotation of the engine 1 via a gear 3 and a timer 4. 1, the fuel injection pump 2 has the same number of cylinders as the engine 1, for example, six pump units 6, and these pump units 6 are connected to the respective cams provided in the above-mentioned power injection pumps 1 to 517. The fuel supply vibrator 7 is driven to sequentially supply fuel to each cylinder of the engine 1 via a fuel supply vibrator 7. .

In addition, the fuel injection pump 2 is
The controller 1 to the roll rack 8 control the supply of fuel to each bomb unit 1 at a time. 2) The control rack 8 is controlled to be rotated to its position 1 by a load lever 10 via a mechanical governor 9 attached to the rear side of the fuel injection pump 2. The load lever 10 is connected to an accelerator pedal 12 via an accelerator cable 11, and rotates according to the amount of depression of the accelerator pedal 12. Further, the load lever 10 is urged to rotate in the backward direction by a return spring 13. Further, an idler 1 to a collar 14 and a full member 1 to a collar 15 are fixedly arranged on the lower end side of the load lever 3-10 so as to be able to come into contact with the load lever 10 (see FIG. 2).

A segment gear 16 is integrally connected to the upper end side of the load lever 10. This segment gear 16 is mounted on the upper part of the casing of the mechanical J leg governor 9, and meshes with a pinion 18 fixed to the output shaft of a step motor 17 which is mounted on the side via a plate (not shown). ing. The rotation of the step motor 18 is controlled by a control signal from the microcomputer 20. The microcomputer 20 includes a vehicle speed detection sensor 21 that detects the speed of the vehicle equipped with the engine 1, an accelerator sensor 22 that detects the amount of depression of the accelerator pedal 12, a rotation detection sensor 23 that detects the rotation speed of the engine 1, and The detection outputs of the position detection sensors 24 that detect the stroke of the control rack 8 of the fuel injection pump 2 are inputted.

In the above configuration, the step motor 17 is constituted by a variable reluctance type motor whose magnets 1 to 1 are constituted by electromagnets, and which does not exhibit holding force when not energized. ing. Therefore, when the motor 17 is not energized, the load lever 10 can freely rotate. Therefore, when the accelerator pedal 12 is depressed, the rotational movement of the pedal 12 is transmitted to the load lever 10 via the accelerator cable 11, and the load lever 10 is moved against the return spring 13 as shown in FIGS. In FIG. 2, it rotates in the counterclockwise fft:# direction. The rotation of the load lever 10 is controlled by the controller 1 of the fuel injection pump 2 via the mechanical governor 9.
~ will be transmitted to the roll rack 8. The amount of fuel supplied to each pump unit 1 of the pump 2 at one time is controlled by this shift of the []]n 1 - 1 l rack.

That is, when the control rack 8 moves to the left in FIG. 1, the time between fuel supplies increases,
Furthermore, when the control rack 8 is moved to the right in the figure, the amount of fuel supplied decreases.

Therefore, when the step motor 17 is not controlled by the microcomputer 20, this fuel supply amount control device operates in the same way as the accelerator pedal.
2.

Next, when driving at a constant speed using this fuel supply amount control device, the rotation of the step motor 17 may be controlled by the microcomputer 20. As described above, the detection outputs of the vehicle speed detection sensor 21, the accelerator sensor 22, the rotation detection sensor 23, and the position detection sensor 24 are input to the microcomputer 20, respectively. The microcomputer 20 mainly reads the detection output of the vehicle speed detection sensor 21 and compares the preset target value of the vehicle speed with the actual running speed of the vehicle detected by the vehicle speed detection sensor 21. Note that the microcomputer 20 additionally reads information regarding the rotational speed of the engine 1 and the stroke of the control rack 8.

When the microcomputer 20 determines that the actual vehicle speed is lower than the target value, the load 1 is lower than the target value.
A control signal is supplied to the step motor 17 so that it rotates counterclockwise in FIGS. 1 and 2. The control signal of this motor 17 is transmitted to the load lever 10 via the pinion 18 and the segment gear 16, and thereby the control rack 8
will move to the left in FIG. Further, when the actual vehicle speed is higher than the target value, the microcomputer 20 sends a control signal to the step motor 17 so that the load lever 10 rotates clockwise in FIG.
will be given to When the step motor 17 rotates the load lever 10 clockwise via the pinion 18 and the segment gear 16, the control rack 8 also moves to the right in FIG. 1, reducing the actual vehicle speed. I will let you do it. In this way, the microcomputer 20 uses the step morph processor 17 to supply fuel to the engine 1.
By controlling the amount by feedback, the vehicle equipped with this engine 1 is able to run at a constant speed.

Next, when economy running is performed using this fuel supply amount control device, an economy running signal is supplied to the microcomputer 20 in advance, and information regarding the stage of economy running is also input as necessary. Then, the microcomputer 20 uses information from the position detection sensor 24 to determine whether the position of the control rack 8 is on the right side in FIG. You will have to judge. and control rack 8
When the stroke reaches the limit for economical travel,
At that moment, the microcomputer 20 gives a control signal to the step motor 17, energizes the step motor 17, and provides a holding force. As a result, the idling step motor 17 is locked by electromagnetic force, and as a result, the load lever 10 cannot rotate any further. That is, the maximum rotational position of the load lever 10 is regulated by the step motor 17, and as a result, the vehicle equipped with this engine 1 can run economically. Here, the position of the control rack 8 is detected by the position detection sensor 24 to perform economical driving, but the rotational position of the load lever 10,
Alternatively, the rotation angle of the step motor 17 may be detected and the load lever 10 for economy traveling may be controlled based on this.

Next, a modification of the above embodiment will be explained with reference to FIG. In this modification, parts corresponding to those in the above embodiment are given the same reference numerals, and descriptions of parts having the same configuration will be omitted. In this modification, the load lever 10 is fixed to the control shaft 2, which is the center of rotation of the load lever 10.
The pinion 28 is fixed to the pin 7. The pinion 28 is meshed with an internal gear 29, and a pinion 31 fixed to the output shaft of a step motor 30 is meshed with the internal gear 29. Therefore, also in this modification, the rotation of the step motor 30 is caused by the rotation of the pinion 31, the internal gear 29, and the pinion 28.
This signal is transmitted to the load lever 10 to which the pinion 28 is fixed. Therefore, by cutting off the power supply to the step motor 30, the engine can be controlled by the accelerator pedal in the same manner as in the past, and by performing feedback control of the engine using the step motor 30, constant speed running of the vehicle can be achieved. In addition, by regulating the maximum amount of rotation of the C load lever 10 by the step motor 30, it is possible to achieve one mile travel of the vehicle.

As described above, the present invention includes a load lever single gear of a mechanical governor, and uses a motor controlled by a motor to rotate the load lever via the gear. This makes it possible to perform complex engine control with a simple configuration.In other words, a vehicle equipped with this engine can run at a constant speed or in an economy. By cutting off the power to the engine and letting it idle, it becomes possible to control the engine by pressing the accelerator pedal in the same way as before, and for this purpose, the engine can be controlled selectively between normal control and electronic control. Furthermore, by changing the gear ratio of the gear train consisting of the above-mentioned gears, the control accuracy can be adjusted, and the accuracy is higher than the rotational accuracy of the motor. This makes it possible to control the rotation angle of the load lever.

[Brief explanation of the drawing]

FIG. 1 is a front view of a diesel engine equipped with a fuel supply amount control device according to an embodiment of the present invention, and FIG. 2 is an enlarged front view of essential parts showing a fuel supply amount control device 11 of this engine. , FIG. 3 is an enlarged front view similar to FIG. 2 of a control device according to a modified example. In addition, in the symbols used in the drawings, 1...Diesel engine 2...Fuel injection pump 9...Mechanical governor 10...Load lever 16...Segment gear 17...Step motor 28...Binion 30...Step motor. Applicant: Hino Motors Co., Ltd.

Claims (1)

[Claims] In the device, the fuel is sequentially supplied from a fuel injection pump to each cylinder of an engine, and the amount of fuel supplied is controlled by rotating a load lever of a mechanical governor provided on the fuel injection pump. 1. A fuel supply amount control device, characterized in that the lever is provided with a gear, and the load lever is rotated via the gear using a motor controlled by a computer.