JPS59120731A - Electronically controlled governor for diesel engine - Google Patents

Abstract

PURPOSE:To improve power characteristics, exhaust level and fuel consumption, by sensing information with respect to an engine such as water temperature, oil temperature, exhaust gas temperature and intake air pressure, and automatically variably regulating a maximum injection amount of a fuel injection pump. CONSTITUTION:Signals (a) indicating an operational condition including information of water temperature from a water temperature sensor 12 are inputted to a control unit 13, and a main command (b) from the control unit 13 is fed to a governor 16 so as to operate an actuator 14 and displace an injection amount regulating rack 15 of a fuel injection pump 11, thereby controlling a fuel injection amount. Further, the control unit 13 receives output signals (c) to (f) from a rack sensor 18, oil temperature sensor 17, exhaust gas temperature sensor 20 and intake air pressure sensor 22, respectively. Thus, optimal full rack position is set according to the output signals from the temperature sensors 12, 17 and 20 and the pressure sensor 22, and a sub command (g) for moving the rack 15 on the basis of the set value as above-mentioned is fed to the actuator 14.

Description

[Detailed Description of the Invention] [Technical Field of the Invention] The present invention relates to an electronically controlled governor for a diesel engine, and in particular is capable of detecting various information regarding the engine and setting a maximum fuel injection amount corresponding to the detected information. Related to electronically controlled governors for diesel engines.

[Technical background of the invention and its problems]

Electronically controlled governors are attracting attention because they control the fuel injection amount and injection timing, which were previously controlled mechanically, using microcombi control, and control precisely according to various operating conditions. In particular, an electronically controlled governor that controls the amount of fuel injection is, for example, a distribution injection pump manufactured by Bosch, as shown in FIG.
An engine rotation sensor 4 is provided on the fuel pump 3 or an engine flywheel (not shown), and an accelerator position sensor 6 is provided on the accelerator pedal 5, and signals obtained from these sensors are inputted to a control unit 7 from a microcomputer or the like. This control unit
The actuator 8 is actuated in accordance with each command based on the above-mentioned signals from 7, and the injection amount adjustment sleeve 9 (spill ring) is moved to control the fuel injection amount according to each driving situation. When the spill ring 9 moves to one side, the injection amount increases and its upper limit determines the maximum injection amount, and when it moves to the other side, the injection amount decreases and its lower limit becomes the idle rotation state. Therefore, the injection amount according to each operating condition can be obtained based on the data set by the signals of each sensor without performing the spill ring 9 mechanically.
Power, fuel efficiency, and feel are improved.

By the way, the maximum fuel injection amount for a diesel engine is very important because it directly affects power, fuel efficiency, and exhaust noise. Therefore, conventionally, the upper limit position of the spill ring 9 was set to be optimal at the engine adjustment stage.

However, although it is possible to set the upper limit position of the spill ring 9, which determines the maximum injection amount, once it is set, it is a fixed type that cannot be moved unless readjusted, so the operating conditions depend on the set value. If they match, there is no problem, but if they do not match, various problems occur.

[Purpose of the invention]

Therefore, it is an object of the present invention to detect various information regarding the engine to automatically and variably adjust the maximum injection amount of an injection pump, and to prevent excessive adjustment in the direction of reducing the maximum injection amount. To provide an electronically controlled governor for a diesel engine which generates an alarm and ensures reliability and safety of the diesel engine.

[Summary of the invention]

According to the present invention, the above object is achieved as follows. In other words, an oil temperature sensor that detects the lubricating oil temperature of the engine and an exhaust gas temperature are added to the existing electronically controlled governor of a diesel engine, which uses the engine cooling water temperature detected by the water temperature sensor as one of the detected information. An exhaust gas temperature sensor that detects, a boost sensor that detects the intake air pressure of the engine, and a member sensor that detects the position of an injection amount adjusting member, such as a rack or a spill ring, are provided.

Further, a computing unit is provided within the control unit which is the central part of the electronically controlled governor. This calculator receives each signal obtained from the water temperature sensor, oil temperature sensor, exhaust temperature sensor, and boost sensor, and determines the maximum injection amount based on the data set by these signals, and determines the full member position of the injection amount adjustment member. a function of instructing the member sensor to move the injection amount adjusting member to a position corresponding to the full member position based on a signal obtained from the member sensor, and giving a sub-command to the actuator that moves the member. has.

Accordingly, the injection amount adjusting member is moved in a direction to decrease the maximum injection amount in response to an increase in temperature and a decrease in intake air pressure,
Moreover, an alarm is issued when the decrease value reaches a predetermined level.

[Embodiments of the invention]

Hereinafter, a preferred embodiment of the electronically controlled governor according to the present invention will be described with reference to the accompanying drawings.

In Figure 2, 10 is a diesel engine, 1,'
11 is an external injection pump installed in parallel with the engine.

This injection pump 11 is connected to a control unit 13 consisting of a microcomputer, etc., which receives a signal a obtained from a water temperature sensor 12 that detects the cooling water temperature of the engine 10, an engine rotation sensor, an accelerator position sensor, etc. (not shown), and the like.
In response to this, the electronically controlled governor 16 operates the actuator 14 according to the main command 4>b from the unit 13, moves the injection amount adjustment rack 15 of the fuel injection pump 11, and controls the fuel injection amount. It has been implemented. This electronically controlled governor 16 moves the rack 15 that directly affects the increase or decrease of the fuel injection amount, so that the injection amount can be obtained according to each operating condition based on the data set by the signals of each sensor. It is configured.

- In the above configuration, an oil temperature sensor 17 for detecting lubricating oil temperature is provided at the bottom of the diesel engine 1o, and a rack sensor 18 for detecting the rack position of the injection amount adjustment rack 15 is provided on the electronically controlled governor 16. The detection signals c and d are sent to the control unit 13, and especially in the latter case, the rack position is fed back. Further, an exhaust temperature sensor 2o for detecting the temperature of the exhaust gas discharged from the exhaust system 19 of the engine is provided, and a boost sensor 22 for detecting the air pressure taken in by the intake system 21 are provided. The detection signal C2r is also sent to the control unit 13.

These detection signals c, d, e, f and the existing water temperature sensor a
The detection signal from the control unit 13 is received by the arithmetic unit 23 provided in the control I/roll unit 13.

This computing unit 23 has a basic control function and a comparison control function. The basic control function functions to preset the optimal full rack position for various temperatures and pressures to be detected, and to give a subcommand g to the actuator 14 to move the injection amount adjustment rack 15 based on this set value. . Here, the full rack position refers to the movement limit position of the injection amount adjustment rack 15 that maximizes the fuel injection amount when everyone is loaded. Further, the sub-command g is a signal a from other sensors such as an engine rotation sensor.
The main command + output based on the data set by
Can coexist with b. The comparison control function includes basic control performed based on the above set value and injection amount adjustment rack 15 based on this.
It compares the actual control performed and feeds it back to the control unit 13 to correct the control.

Further, the control unit 13 is provided with a notification means 24 such as a buzzer that receives a signal from the computing unit 23 and notifies that the maximum injection amount has fallen below a certain level.

Next, we will describe the operation of this electronically controlled second governor, which has the following two configurations.

The full rack position for various temperatures and intake air pressures preset in the arithmetic unit 23 is set to data values as shown in FIG. In the full rack position, the positive direction indicates the fuel increase direction, and the minus direction indicates the fuel decrease direction.

Now, if the operating conditions change, one of the water temperature sensor 12, oil temperature sensor 17, exhaust temperature sensor 20, and boost sensor 22 detects the change, and the detection signal is sent to the control unit 13. A computing unit 23 provided in the control unit 13 receives the detection signal and corrects the full rack position corresponding to an increase or decrease in temperature or intake air pressure in accordance with the data values shown in FIG. At the same time, as shown in Fig. 4, the amount of change in movement of the injection amount adjustment rack 15 corresponding to the stroke of the accelerator pedal is corrected to correspond to the corrected full rack position 7, and the full rank position
. The amount of movement of the injection amount adjustment rack 15 is decreased or increased compared to when the injection amount adjustment rack 15 was previously used. The above modification is necessary because it is not possible to change the full stroke of the accelerator pedal. However, when decreasing the amount of movement, for example when moving to X2 in FIG. 4, all rack positions above X2 can be set to the value of X2.

Based on this control function by the computing unit 23, the actuator 1
4, a control command /8>g is issued to give the corrected movement to the injection amount adjustment rack 15. Although the injection amount adjustment rack 15 is moved by this sub-command g, the rack position due to the movement is immediately detected by the rack sensor 18 and fed back to the actuator 14 based on the comparison control function, and the actuator 14 controls the actual position of the injection amount adjustment rack 15. Place the control on the correct movement line with precision.

When the accelerator pedal is fully loaded to the full stroke, the injection amount adjustment rack 15 is moved to the set value X2 or Xl and then stopped there.

Through such control, the maximum fuel injection amount is decreased or increased, and the full stroke of the accelerator pedal is lengthened accordingly.
Since the fuel injection amount also uniformly decreases or increases, it is possible to obtain an injection amount that matches the operating conditions. Further, - when the maximum injection amount becomes less than a predetermined value due to the above control, a signal is output from the computing unit 23 and the warning means 24 is activated, so that the abnormality can be known.

Therefore, at full load, as shown in Figure 5, the actual injection amount adjustment rack 15 control is performed directly depending on the magnitude of the information about the engine, and the rack position is reduced to the optimum maximum injection amount. Since the amount increases and decreases as follows, the power characteristics are good and the reliability of the engine can be secured. However, in certain cases, the alarm means 24 is activated to notify of an abnormality, so that safe driving can be carried out.

As can be seen from FIG. 5, there is no control according to the present invention during startup, idling, or maximum speed control. This is because the fuel supply required at startup is larger than the injection amount at full load, so main order 4>b is lateral + g.
This is because the system gives priority to overcharging.

In this way, information regarding the engine is detected by various sensors, and the maximum injection amount of the fuel injection pump 11 can be variably adjusted according to the detection results, and since this adjustment is made automatically, it is possible to adjust the maximum injection amount according to the engine operating conditions. output.

In the above embodiment, the movement of the injection amount adjustment rack 15 is controlled, but it goes without saying that the movement of the spill ring may be directly controlled and the spill ring whose position is detected may be detected.

〔Effect of the invention〕

In summary, the present invention exhibits the following excellent effects.

(1) Various information about the engine is detected and the maximum injection amount of the fuel injection pump is automatically adjusted based on this detection signal, so unlike conventional fixed types, the power characteristics such as driving force and acceleration It is possible to improve the exhaust level and further improve fuel efficiency, ensuring the reliability of the diesel engine.

(2) Moreover, since a warning is issued when the maximum injection amount falls to a certain level due to the control according to the present invention, safe operation can be ensured.

(3) Provide a member sensor that detects the position of the injection amount adjustment member and feed back the actual movement value of the adjustment member;
Since this is compared with the set value of the main control, the maximum injection amount can be adjusted with extremely high precision.

(4) The structure is simple because it can be configured by adding various sensors to an existing electronically controlled governor.

[Brief explanation of the drawing]

FIG. 1 is a schematic explanatory diagram showing an example of a conventional electronically controlled governor for a diesel engine, and FIG. 2 is a schematic system diagram showing a preferred embodiment of the electronically controlled governor for a diesel engine according to the present invention. FIG. 3 is a diagram showing the set basic control characteristics according to the present invention, FIG. 4 is an explanatory diagram showing changes in rack movement amount corrected by the same basic control, and FIG. 5 is also controlled by the basic control. FIG. 6 is an explanatory diagram of rack position operation under full load. In the figure, 10 is a diesel engine, 11 is a fuel injection pump, 12 is a water temperature sensor, 13 is a control unit, 14 is an actuator, 15 is an injection amount adjustment rack that is an example of an injection amount adjustment member, 17 is an oil temperature sensor, 18 is a rack sensor which is an example of a member sensor, 20 is an exhaust temperature sensor, 22 is an intake air pressure sensor, 23 is an arithmetic unit, 24 is an alarm means, b is a main command, and g is a sub-command. Patent applicant Nobuo Kinuya, patent attorney representing Isuso Jidosha Co., Ltd.

Claims (2)

[Claims] (1) The control unit receives signals obtained from the water temperature sensor, engine rotation sensor, injection amount adjustment member sensor, accelerator position sensor, etc. according to each operating condition, and operates the actuator based on the main command from this unit to inject fuel. An electronically controlled governor for a diesel engine that controls the fuel injection amount by moving the pump's injection amount adjustment member has an oil temperature sensor that detects the engine's lubricating oil temperature and an exhaust temperature sensor that detects the exhaust gas temperature. A sensor, a boost sensor that detects the engine's intake air pressure,
A member sensor that detects the position of the injection amount adjusting member is provided, and receives each signal obtained from the water temperature sensor, oil temperature sensor, exhaust temperature sensor, and boost sensor, and performs maximum injection based on data set by these. A sub-assembly for instructing the member sensor of the full member position of the injection amount adjusting member that determines the injection amount, and correcting and moving the injection amount adjusting member to a position corresponding to the full member position based on a signal obtained from the member sensor. An electronically controlled governor for a tasel engine, characterized in that the control unit is provided with an arithmetic unit that superimposes a command on the main command and applies it to the actuator. (2) The full member position is controlled in the direction of decreasing the maximum injection amount, and when this control value reaches a predetermined level, alarm means is provided for issuing an alarm by a signal output from the arithmetic unit. An electronically controlled governor for a tasel engine according to claim 1.