JP2003328824A - Electronic governor control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic governor control device that can easily handle a user's request for a change is idle speed and maximum no-load speed by enabling a setting change in idle speed an maximum no-load speed. <P>SOLUTION: A controller 18 computes a target speed of an engine 11 depending on a control input of an accelerator pedal 15 from a standard map, and detects an actual engine speed from an output signal of a distributor 17. The controller 18 then decides a target opening angle of a throttle valve from the deviation of the engine speed from the target speed, and drives a DC motor 14 to offer the target opening angle. When idle speed setting means 19 and maximum no-load speed setting means 20 change setting of at least either maximum no-load speed or idle speed, the controller 18 automatically corrects the target speed as setting from the standard map showing a relation between accelerator control input and target speed. <P>COPYRIGHT: (C)2004,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electronic governor control device, and more particularly to an electronic governor control device which is preferably used for engine speed control in an internal combustion engine such as a gasoline engine applied to industrial vehicles such as forklifts. It is about.

[0002]

2. Description of the Related Art In an engine-type forklift, an electronic governor is provided which controls a throttle valve provided in an intake passage of a gasoline engine to be opened / closed by an actuator (step motor) and controls the engine speed according to the opening / closing amount. Known (for example, Japanese Patent Laid-Open No.
No. 59990).

The electronic governor control device for controlling the engine speed reads the target speed corresponding to the depression amount (accelerator opening) of the accelerator pedal as a command value, and at the same time reads the actual engine speed as an input value. The electronic governor control device obtains the deviation between the target rotation speed and the actual engine rotation speed, and performs PID calculation for "PID control" based on the deviation value. Then, the electronic governor control device controls the engine speed by driving and controlling the step motor by a required amount and opening the throttle valve by a required amount based on the calculation result.

[0004]

In the mechanical air governor, the throttle is closed by using the intake negative pressure in order to limit the engine torque at the maximum rotation speed.
Then, it is necessary to adjust the idle speed and the maximum unloaded speed, which is troublesome to adjust. On the other hand, the electronic governor control device has an advantage that it is not necessary to adjust the idle speed and the maximum unloaded speed.

However, in reality, the user is required to change the above-mentioned rotational speed, for example, to lower the maximum unloaded speed due to noise, set an idle rotational speed according to the existing machine base (forklift), or the like. There are cases. However, since the conventional electronic governor control device does not have the rotational speed adjusting element, a part of the control program is specially changed each time to meet the user's request. As a result, it took time to respond.

The present invention has been made in view of the above-mentioned conventional problems, and an object thereof is to enable setting changes of an idle speed and a maximum no-load speed, which allows the idle speed and the no-load of a user to be changed. An object of the present invention is to provide an electronic governor control device that can easily cope with a request for changing the maximum rotation speed.

[0007]

In order to achieve the above-mentioned object, the invention according to claim 1 is to set an actuator for opening and closing a throttle valve provided in an intake passage of an internal combustion engine, and a target rotational speed of the internal combustion engine. Target rotation speed calculation means for calculating the target rotation speed as a command value, and rotation speed detection for detecting the actual rotation speed of the internal combustion engine, based on the operation amount of the target rotation speed setting means operated to give an instruction. Means for calculating the deviation between the target rotation speed command value calculated by the target rotation speed calculation means and the actual rotation speed detection value by the rotation speed detection means, and the target of the throttle valve based on the calculation result. An electronic governor control device comprising: a drive control unit that determines an opening and drives and controls the actuator so that the target opening is reached. Then, a reference rotation speed setting means capable of setting a reference rotation speed including at least one of the no-load maximum rotation speed and the idle rotation speed is provided, and when at least one of the no-load maximum rotation speed and the idle rotation speed is changed, Corrected target rotation speed setting means for automatically correcting and setting the target rotation speed based on a standard map or a relational expression indicating the relationship between the stored operation amount of the target rotation speed setting means and the target rotation speed. Provided.

According to the present invention, the target rotation speed of the internal combustion engine is calculated based on the operation amount of the target rotation speed setting means (for example, the accelerator pedal), and the deviation from the detected value of the actual rotation speed is calculated. It Then, the target opening of the throttle valve is determined based on the calculation result, and the drive control means drives and controls the actuator so as to reach the target opening. The target rotation speed is calculated based on a standard map or a relational expression stored in advance. At least one of the no-load maximum rotation speed and the idle rotation speed can be changed by the reference rotation speed setting means. When at least one of the no-load maximum rotation speed and the idle rotation speed is changed, the correction target rotation speed setting means automatically corrects the target rotation speed based on the standard map or the relational expression stored in advance. Is set. Therefore, when the user requests a change in the maximum no-load rotation speed or the idle rotation speed, it can be easily dealt with.

According to a second aspect of the present invention, in the first aspect of the present invention, the reference rotation speed setting means can set both the no-load maximum rotation speed and the idle rotation speed as the reference rotation speed. It is configured. According to the present invention, it is possible to easily deal with the case where both the no-load maximum rotation speed and the idle rotation speed are requested to be changed.

According to a third aspect of the present invention, in the first or second aspect of the present invention, the corrected target rotational speed setting means sets the corrected target rotational speed by the reference rotational speed setting means. The difference between the set no-load maximum rotation speed set by the reference rotation speed setting means and the set idle rotation speed is divided by the difference between the standard no-load maximum rotation speed and the standard idle rotation speed. It is set to a value obtained by adding the product of this value and the value obtained by multiplying the difference between the standard target speed and the standard idle speed.

In the present invention, when only one of the values is changed by the reference rotation speed setting means, the other value is set based on the standard map or the relational expression without being corrected by the correction target rotation speed setting means. Therefore, unlike the case where the target rotation speed is set by simply translating the graph showing the relationship obtained by the standard map corresponding to the change amount of one of the no-load maximum rotation speed and the idle rotation speed whose setting has been changed,
The effective operation amount of the target rotation speed setting means can be secured, and the feeling during operation is improved.

According to a fourth aspect of the invention, in the invention according to any one of the first to third aspects, the internal combustion engine is mounted on an industrial vehicle, and the throttle valve is 1
It is provided individually. According to the present invention, in an industrial vehicle such as a forklift whose load is significantly different between high load and no load, the opening of one throttle valve has a proper rotation speed corresponding to the operation amount of the target rotation speed setting means. The opening is adjusted to drive the internal combustion engine. Therefore, the structure is simpler than the structure including two throttle valves.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment in which the present invention is embodied in an engine type forklift as an industrial vehicle will be described below with reference to FIGS.

FIG. 1 is a schematic configuration diagram showing an electronic governor control device for controlling the rotational speed of a gasoline engine as an internal combustion engine in this embodiment. As is well known, a gasoline engine 11 (hereinafter, simply referred to as an engine) mounted on a forklift is a drive source for traveling the forklift and also a drive source for a hydraulic circuit for moving the fork up and down. A throttle body 13 that supports the throttle valve 12 so as to be opened and closed is provided in the middle of an intake passage (not shown) in the engine 11, and the throttle valve 12 serves as an actuator D.
It is opened and closed by the C motor 14. One throttle valve 12 is provided. The output shaft of the DC motor 14 is connected to the support shaft of the throttle valve 12 via a power transmission mechanism, and the DC motor 14 is driven by a predetermined amount to open / close the throttle valve 12 in accordance with the driving amount. It has become so.

The forklift is provided with an accelerator pedal 15 which is operated to command a target rotation speed D0 of the engine 11, and a potentiometer as an accelerator operation amount detecting means for detecting an operation amount (accelerator opening) θ of the accelerator pedal 15. An accelerator sensor 16 is provided.

In this embodiment, in order to detect the actual rotation speed (actual rotation speed) DN of the engine 11, it is not necessary to provide a special rotation speed sensor, so that the engine 11 also serves as a rotation speed sensor. Distributor 17 is provided as a rotation speed detecting means for determining the ignition timing. This distributor 17 is engine 1
It is composed of a rotor that is interlocked with one rotation and a pickup that periodically detects the rotation of the rotor.

The controller 18 constituting the target rotation speed calculation means, drive control means, and corrected target rotation speed setting means is composed of a microcomputer having a built-in memory. A program for controlling the engine speed is stored in the memory.

Further, in the memory of the controller 18, when at least one of the no-load maximum rotation speed and the idle rotation speed is changed, the operation amount of the target rotation speed setting means and the target rotation speed which are stored in advance are stored. A program or the like for automatically correcting and setting the target rotation speed based on a standard map showing the relationship of is stored. As the standard map, for example, a standard map M1 showing the relationship (characteristic) between the accelerator opening θ and the target rotational speed D0 as shown by the solid line in FIG.
Is remembered. The standard map M1 is stored as a graph in which the vertical axis represents the target rotation speed D0 and the horizontal axis represents the accelerator opening θ. In the standard map M1, the rate of change of the target rotational speed with respect to the change of the accelerator opening θ is larger than the rate of change in the middle portion in the range where the accelerator opening θ is small, and the change in the middle portion in the range where the accelerator opening θ is large. It is set to be smaller than the rate. It should be noted that this characteristic is the case where the correction amounts for the idle speed and the maximum unloaded speed are 0 after the complete warm-up.

In the idle speed adjustment range (hatched area in FIG. 2), the plus side adjustment range is set larger than the standard idle speed IDL _TYP shown by the broken line in FIG. The no-load maximum rotation speed adjustment area (hatched area in FIG. 2) has the same adjustment range on the plus side and the minus side with respect to the standard no-load maximum rotation speed NMR _TYP shown by the broken line in FIG. There is.

The controller 18 includes an accelerator sensor 1
6 and the distributor 17 are electrically connected. Then, the controller 18 uses the ignition signal periodically obtained from the distributor 17, obtains the actual rotation speed DN from the interval of the ignition signal, and detects the rotation speed of the engine 11.

Further, the controller 18 is electrically connected to an idle speed setting means 19 as a reference speed setting means and a no-load maximum speed setting means 20.
The idle speed setting means 19 is composed of an adjusting volume and can continuously set the idle speed continuously. The no-load maximum rotation speed setting means 20 is also composed of an adjusting volume so that the no-load maximum rotation speed can be continuously set without any step. That is, in this embodiment, both the no-load maximum rotation speed and the idle rotation speed as the reference rotation speed can be set.

The idle rotation speed setting means 19 and the no-load maximum rotation speed setting means 20 are not provided at the driver's seat of the forklift but usually at a position where the driver cannot operate (for example, in the engine room).

The controller 18 is adapted to calculate the target rotational speed by the following equation based on the standard map shown in FIG. D _A = IDL _A + (NMR _A −IDL _A ) / (NMR _TYP −IDL _TYP ) × (D _TYP −IDL _TYP ) ... (1) D _A : Target rotational speed D _TYP at current setting: standard Target rotational speed IDL _A : Idle rotational speed IDL _TYP at current setting: Standard idle rotational speed NMR _A : Maximum no-load rotational speed NMR _TYP at current setting: Standard no-load maximum rotational speed controller 18 is a PID control circuit and a DC motor 1
4 is provided with a drive circuit and the like (none of which is shown). Then, the controller 18 inputs the detected value of the accelerator opening θ from the accelerator sensor 16 and the ignition signal from the distributor 17 as a signal indicating the actual rotation speed DN. Also, the controller 1
8 based on a program for engine speed control stored in the memory, using these input signals, D
The C motor 14 is driven and controlled.

When at least one of the idle speed and the maximum no-load speed requested by the user is different from the standard speed, the idle speed and the maximum no-load speed are requested by the user at a manufacturing plant or a forklift dealer before shipment. The idle speed setting means 19 and the no-load maximum speed setting means 20 are operated to set the values. And
The forklift is shipped with the idle speed and the maximum no-load speed set to the values required by the user.

Next, the operation of the electronic governor control device configured as described above will be described with reference to the flowchart of FIG. The controller 18 reads the actual rotation speed DN of the engine 11 based on the ignition signal from the distributor 17 in step S1, and then proceeds to step S2. In step S2, it is determined whether or not the temperature ET of the engine 11 is equal to or higher than a predetermined temperature T0 based on a detection signal of a temperature sensor (not shown).

If the temperature is lower than the predetermined temperature T0 in step S2, the controller 18 proceeds to step S3, and then step S3.
After setting the target rotation speed D0 to the predetermined rotation speed DiT corresponding to the temperature ET of the engine 11 regardless of the accelerator opening θ in step 3, the process proceeds to step S4. The predetermined rotation speed DiT is stored in the memory as a map or a relational expression.

In step S4, the controller 18 calculates the deviation between the target rotation speed D0 and the actual rotation speed DN, and based on the calculation result, the target drive amount MV of the DC motor 14 corresponding to the target opening degree of the throttle valve 12. To calculate "PI
After performing the operation of "D control", the process proceeds to step S5. In step S5, the controller 18 outputs a command signal for driving the DC motor 14 by the calculated target drive amount MV to the DC motor 14 via the drive circuit. That is, the DC motor 14 is driven based on the target drive amount MV.

If the temperature is equal to or higher than the predetermined temperature T0 in step S2, the controller 18 proceeds to step S6. Step S
In 6, the controller 18 calculates the target rotational speed D _A at the current setting corresponding to the accelerator opening θ by the above equation (1), and then proceeds to step S7. The controller 18
In step S6, it functions as a correction target rotation speed setting means. Further, when the setting is not changed for either the idle rotation speed or the maximum unloaded rotation speed, the controller 18 functions as the target rotation speed calculation means in step S6.

In step S7, the controller 18 calculates the deviation between the target rotation speed D _A and the actual rotation speed DN, and based on the calculation result, the target drive of the DC motor 14 corresponding to the target opening of the throttle valve 12 is performed. Calculate the amount MV "P
After performing the calculation of "ID control", the process proceeds to step S5.
The controller 18 determines the target opening of the throttle valve 12 in step S7 and step S5, and functions as drive control means for driving and controlling the DC motor 14 so that the target opening is reached.

That is, when the temperature ET of the engine 11 is lower than the predetermined temperature T0, the accelerator opening θ is controlled so as to reach the predetermined rotation speed DiT corresponding to the temperature ET of the engine 11 regardless of the set idle rotation speed. . Then, after the temperature ET of the engine 11 reaches or exceeds the predetermined temperature T0, the accelerator opening θ is controlled so as to reach the target rotation speed D _A set based on the standard map M1 of FIG. When the setting of the idle speed and the maximum no-load speed is not changed, the target speed corresponding to the accelerator opening θ in the standard map M1 becomes the target speed without correction.

As a method for setting (correcting) the target rotation speed when the setting of the idle rotation speed is changed, as shown by the solid line in FIG. 4, the characteristic that the difference between the maximum no-load maximum rotation speed and the idle rotation speed is large. Is stored in the memory as a standard map, and the characteristic graph is moved in parallel as shown by the chain line according to the idle speed to use. In this method, when the value of the target rotation speed corresponding to the accelerator opening exceeds the maximum rotation speed, the value of the target rotation speed is set to the maximum rotation speed regardless of the accelerator opening.
The effective angle of 5 becomes narrow, which adversely affects the feeling. However, in the method of setting (correcting) the target rotation speed using the equation (1), it is possible to prevent the effective angle of the accelerator pedal 15 from becoming narrow even if the settings of the idle rotation speed and the maximum no-load rotation speed are changed. , The feeling is improved.

This embodiment has the following effects. (1) The idle speed setting means 19 and the no-load maximum speed setting means 20 are provided, and when at least one of the no-load maximum speed and the idle speed is changed, based on the standard map M1 stored in advance. Then, the target rotational speed corresponding to the accelerator opening θ is automatically corrected and set. Therefore, when the user requests a change in the no-load maximum rotation speed and the idle rotation speed, unlike the conventional electronic governor control device, the idle rotation speed setting means 19 and the no-load maximum rotation speed setting means 20 are operated and no operation is performed. It can be easily dealt with by changing the maximum load speed and the idle speed.

(2) The corrected target rotation speed setting means (controller 18) sets the corrected target rotation speed, that is, the target rotation speed D _A in the current setting, by the above equation (1).
That is, the set idle speed IDL _A, set no-load maximum speed NMR _A and set idle speed IDL _A and the difference of the standard no-load maximum speed NMR _TYP and the standard idle speed I of
It is set to a value obtained by adding the product of the value divided by the difference with DL _TYP and the value obtained by multiplying the difference between the standard target speed and the standard idle speed. Therefore, unlike the case where the target rotation speed is set by simply translating the graph showing the relationship obtained by the standard map M1 corresponding to the change amount of one of the no-load maximum rotation speed and the idle rotation speed whose setting has been changed. A wide effective operation amount (effective angle) of the accelerator pedal 15 can be ensured, and the driving feel is improved.

(3) The correction target rotation speed setting means (controller 18) operates in a state where the effective operation amount of the accelerator pedal 15 is neither the maximum no-load rotation speed nor the idle rotation speed set by the reference rotation speed setting means. The target number of revolutions is corrected corresponding to the operation amount of the accelerator pedal 15 so as to be the same as the effective operation amount of. Therefore, a wide effective operation amount (effective angle) of the accelerator pedal 15 can be secured, and the feeling during driving is improved.

(4) The throttle valve 12 is applied to an engine 11 mounted on a forklift as an industrial vehicle in which the load is greatly different between high load and no load.
It is provided individually. Therefore, the structure is simpler than the structure including two throttle valves.

(5) When the temperature ET of the engine 11 is lower than the predetermined temperature T0, the accelerator opening θ is controlled so as to reach the predetermined rotation speed DiT corresponding to the temperature ET of the engine 11 regardless of the set idle rotation speed. It The idle speed adjustment range is set to be larger on the plus side of the standard idle speed IDL _TYP . Therefore, in a warm-up state at a low temperature, the effect is particularly effectively exhibited.

(6) The idle rotation speed setting means 19 and the no-load maximum rotation speed setting means 20 as the reference rotation speed setting means are respectively constituted by adjusting volumes capable of continuously setting the rotation speed in a stepless manner. Therefore, the idle speed and the maximum no-load speed can be easily set to arbitrary values.

(7) The idle rotation speed setting means 19 and the no-load maximum rotation speed setting means 20 are provided not at the driver's seat of the forklift, but usually at a position where the driver cannot operate (for example, in the engine room). There is. Therefore, it is possible to prevent the driver from arbitrarily changing the setting of the idle rotation speed and the maximum no-load rotation speed and operating the forklift under the conditions contrary to the intention of the employer.

The embodiment is not limited to the above, but may be configured as follows, for example. In the above embodiment, both the idle speed setting means 19 and the no-load maximum speed setting means 20 are provided as the reference speed setting means, but only one of the idle speed and the no-load maximum speed can be set. A reference rotation speed setting means may be provided. That is, only one of the idle rotation speed setting means 19 and the no-load maximum rotation speed setting means 20 may be provided. Even in that case, when the engine speed is controlled, the target engine speed is calculated by the equation (1), so that the idle engine speed or the maximum no-load engine speed can be easily changed.

It is sufficient that the reference rotation speed setting means can set a reference rotation speed including at least one of the no-load maximum rotation speed and the idle rotation speed, and the reference rotation speed other than the no-load maximum rotation speed and the idle rotation speed is set. May be configurable. For example, as shown in FIG. 5, the standard map M2 having a region in which the target rotation speed does not change even if the accelerator opening θ increases along the way is stored as a memory, as shown in FIG. To memorize. Then, the target rotation speed in a region where the target rotation speed does not change even if the accelerator opening θ increases may be settable. When this standard map M2 is used, the controller 18 controls the opening of the throttle valve 12 so as to keep the target rotation speed constant when the accelerator opening θ is within a predetermined range. Therefore, for example, when traveling at a predetermined speed, the operation of the accelerator pedal 15 becomes easy.

[0041] The idle speed setting means 19 and the no-load maximum speed setting means 20 are replaced by an adjusting volume capable of continuously changing the rotation speed in a stepless manner, and a dial capable of changing the rotation speed stepwise. It may be a type switch. Also, a plurality of switches whose rotation speeds can be changed stepwise may be provided.

As the reference rotation speed setting means, instead of a configuration such as an adjustment volume control or a dial type switch that can manually set the idle rotation speed and the like, instead of a predetermined area of a memory equipped in the controller 18, The reference rotation speed such as the idle rotation speed may be stored. For example, from the input terminal of the non-volatile memory idle speed,
It is also possible to input the maximum unloaded speed and the like and store the data in the memory. In this case, it can be manufactured at a lower cost as compared with a configuration in which an adjusting volume, a dial type switch and the like are provided.

The idle rotation speed setting means 19 and the no-load maximum rotation speed setting means 20 as the reference rotation speed setting means
May be provided in the driver's seat. In this case, the driver can easily change the idle rotation speed and the maximum unloaded rotation speed, and appropriate rotation speed control can be performed according to changes in the operating environment and operating conditions.

The standard map M1 is not limited to an upwardly convex graph as shown in FIG. 2, but the one in which the accelerator opening θ has a linear relationship with the target rotational speed, and the accelerator opening θ is In a small range, the rate of change of the target rotational speed with respect to the change of the accelerator opening θ may be set to be smaller than the rate of change in the intermediate portion.

The method of correcting the target rotation speed when at least one of the idle rotation speed and the no-load maximum rotation speed is changed is not limited to the method using the equation (1). For example, other relational expressions may be used, or a plurality of standard maps having different combinations of idle rotation speed and maximum no-load rotation speed may be stored in the memory, and the idle rotation speed and the idle rotation speed set by the reference rotation speed setting unit may be stored. The target rotation speed may be calculated using a standard map close to the combination of the maximum load rotation speeds.

It is also possible to set the plus side and the minus side to the same width without setting the adjustment range of the idle speed so that the plus side is wider than the minus side. A stepping motor or an AC motor may be used instead of the DC motor 14 as an actuator for driving the throttle valve 12.

Although the distributor 17 is used as the rotation speed detecting means for detecting the actual rotation speed DN of the engine 11, another rotation speed sensor may be used to detect the rotation speed of the engine 11.

Not limited to the configuration in which one throttle valve 12 that is opened and closed by an actuator is provided in the middle of the intake passage of the engine 11, a throttle valve mechanically interlocked with the movement of the accelerator pedal 15 and an actuator are used. Throttle valve 1 driven to open and close
It is also possible to adopt a configuration in which both and 2 are provided.

When the temperature of the engine 11 is lower than the predetermined temperature T0, regardless of the accelerator opening θ, the processing for setting the target rotation speed D0 to a value corresponding to the temperature ET of the engine 11 is not performed, and the accelerator opening θ is set. The opening degree of the throttle valve 12 may be controlled so that the target rotation speed corresponding thereto is obtained.

As a target rotation speed setting means, a manually operated accelerator lever or dial may be provided instead of the accelerator pedal 15. 〇 Not limited to forklifts, it may be applied to other industrial vehicles such as aerial work vehicles and truck trucks where the load is significantly different between high load and no load.

The invention (technical idea) understood from the above embodiment will be described below. (1) In place of the reference rotation speed setting means according to claim 1, there is provided reference rotation speed setting means capable of setting a reference rotation speed including at least the maximum no-load rotation speed, and at least the maximum no-load rotation speed is changed. At this time, a corrected target rotation that is set by automatically correcting the target rotation speed based on a standard map or a relational expression indicating the relationship between the operation amount of the target rotation speed setting means and the target rotation speed that is stored in advance. An electronic governor control device provided with a number setting means.

(2) In place of the reference rotation speed setting means described in claim 1, reference rotation speed setting means capable of setting a reference rotation speed including at least an idle rotation speed is provided, and at least the idle rotation speed is changed. At this time, a corrected target rotation speed that is automatically set by correcting the target rotation speed based on a standard map or a relational expression indicating the relationship between the operation amount of the target rotation speed setting means and the target rotation speed that is stored in advance. An electronic governor control device provided with setting means.

(3) In place of the reference rotation speed setting means according to claim 1, there is provided reference rotation speed setting means capable of setting a reference rotation speed including at least a maximum no-load rotation speed and an idle rotation speed, and at least none. When the maximum load rotation speed and the idle rotation speed are changed, the target is automatically stored based on a standard map or a relational expression indicating the relationship between the operation amount of the target rotation speed setting means and the target rotation speed which is stored in advance. An electronic governor control device provided with a correction target rotation speed setting means for correcting and setting the rotation speed.

(4) In the invention according to any one of claims 1 to 4 and technical ideas (1) to (3), the reference rotation speed setting means is a maximum no-load rotation speed and an idle speed. As a reference rotation speed other than the rotation speed, a rotation speed that is kept constant within a predetermined range of the accelerator opening can be set.

(5) In the invention according to any one of claims 1 to 4 and the technical ideas (1) to (4), the reference rotation speed setting means is provided in a predetermined area of the memory. The reference rotation speed such as the idle rotation speed is stored.

(6) In the invention according to any one of claims 1 to 4 and technical ideas (2) and (3), an adjustment range (adjustment) of the idle speed by the reference speed setting means. The range) is set wider on the plus side than on the minus side with respect to the standard speed.

(7) In the invention described in any one of claims 1 and 2 and the technical ideas (1) to (4), the corrected target rotation speed setting means sets the target rotation speed. So that the effective operation amount of the means is the same as the effective operation amount in the state where neither the maximum no-load rotation speed nor the idle rotation speed is changed by the reference rotation speed setting means,
The target rotation speed is corrected according to the operation amount of the target rotation speed setting means.

[0058]

As described in detail above, according to the invention described in claims 1 to 4, it is possible to change the setting of the idle speed and the maximum unloaded speed in the electronic governor control device. It is possible to easily deal with the user's request for changing the idle speed and the maximum unloaded speed.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram showing an electronic governor control device according to an embodiment.

FIG. 2 is a diagram showing a standard map used for setting a target rotation speed.

FIG. 3 is a flowchart illustrating the operation of engine speed control.

FIG. 4 is a diagram showing a standard map used for another target rotation speed setting method.

FIG. 5 is a diagram showing another standard map.

[Explanation of symbols]

M1, M2 ... Standard map, 11 ... (Gasoline) engine as internal combustion engine, 12 ... Throttle valve, 14 ... DC motor as actuator, 15 ... Accelerator pedal as target speed setting means, 16 ... Accelerator sensor, 17 ... Distributor as rotation speed detection means, 18 ... Target rotation speed calculation means, controller constituting drive control means and corrected target rotation speed setting means, 19 ... Idle rotation speed setting means as reference rotation speed setting means, 2
0: Similarly, a no-load maximum rotation speed setting means.

Claims (4)

[Claims] 1. An actuator for opening and closing a throttle valve provided in an intake passage of an internal combustion engine, and an operation amount of a target rotation speed setting means operated to command a target rotation speed of the internal combustion engine, based on an operation amount of the actuator. Target rotation speed calculation means for calculating a target rotation speed as a command value, rotation speed detection means for detecting an actual rotation speed of the internal combustion engine, target rotation speed command value calculated by the target rotation speed calculation means, and The deviation from the actual detected value of the rotation speed by the rotation speed detection means is calculated, the target opening of the throttle valve is determined based on the calculation result, and the actuator is drive-controlled to reach the target opening. In the electronic governor control device including drive control means, a reference rotation speed setting capable of setting a reference rotation speed including at least one of a maximum no-load rotation speed and an idle rotation speed is provided. Means, and when at least one of the no-load maximum rotation speed and the idle rotation speed is changed, a standard map or a relational expression showing the relationship between the operation amount of the target rotation speed setting means and the target rotation speed stored in advance. An electronic governor control device provided with a correction target rotation speed setting means for automatically correcting and setting the target rotation speed based on the above. 2. The electronic governor control device according to claim 1, wherein the reference rotation speed setting means is configured to be able to set both the maximum no-load rotation speed and the idle rotation speed as the reference rotation speed. 3. The corrected target rotation speed setting means sets the corrected target rotation speed to the set idle rotation speed set by the reference rotation speed setting means without setting by the reference rotation speed setting means. A value obtained by dividing the difference between the maximum load rotational speed and the set idle rotational speed by the difference between the standard no-load maximum rotational speed and the standard idle rotational speed was multiplied by the difference between the standard target rotational speed and the standard idle rotational speed. The electronic governor control device according to claim 1, wherein the electronic governor control device is set to a value obtained by adding a product of the value and the product. 4. The electronic governor control device according to claim 1, wherein the internal combustion engine is mounted on an industrial vehicle, and one throttle valve is provided.