JPH06144078A - Maximum speed limiter of diesel engine mounted vehicle - Google Patents

Abstract

PURPOSE:To make a device properly operable even if a shift speed detecting switch is short-circuited by forming the switch into doubledness in structure, pertaining to a maximum speed limiter of a diesel engine mounted vehicle. CONSTITUTION:A vehicle, being mounted with a diesel engine and limited to the maximum speed, is provided with a speed control lever 1, an actuator 2, a control part 3, a shift speed detecting means 4 and a car speed detecting means 8. In this constitution, the control part 3 sets a position of the speed control lever 1 to a specified engine speed limiting position via the actuator at a time when such a fact that a shift speed to limit the maximum speed is detected by the shift speed detecting means 4 or car speed has come to higher than the specified value is detected by the car speed detecting means 8 through a detection signal line DL.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a maximum speed limiting device for a vehicle equipped with a diesel engine.

[0002]

2. Description of the Related Art Conventionally, for example, a semi-tractor 2 for carrying a heavy load equipped with a semi-trailer 30 as shown in FIG.
Vehicles equipped with a diesel engine such as 0 have a limited maximum speed. That is, in such a vehicle, the maximum speed of the transmission is locked by the maximum speed limiting device. For example, the fifth speed, which is the highest speed, is locked and the vehicle travels at the fourth speed or lower to suppress the vehicle speed. Has become.

FIG. 4 is a control block diagram showing a conventional maximum speed limiting device installed in a vehicle equipped with a diesel engine such as this semi-tractor. In FIG. 4, 11 is a speed control lever, The speed control lever 11 is capable of adjusting the engine speed by controlling the amount of fuel injected by the fuel injection pump 16, and is provided for the fuel injection pump 16.

Reference numeral 12 denotes an air cylinder. The air cylinder 12 takes in compressed air from an air tank 15 and can adjust the position of the speed control lever 11 from a high speed position to a low speed position by utilizing the internal pressure of the air. The air valve is connected to the air tank 15 via the air pipe, and the air pipe connecting the air cylinder 12 and the air tank 15 is provided with the magnet valve 13.

The air cylinder 12 has a piston 12-1 and a spring 12-2 built therein. When the internal pressure of the piston 12-1 increases, the piston 12-1 moves to the left in FIG. 4, but the internal pressure decreases. And this spring 1
It moves to the right by the action of 2-2. 1
3 is a magnet valve, and this magnet valve 1
3 is the air cylinder 12 and the air tank 1 as described above.
5 is connected to the air pipe, and is opened / closed based on the detection information input from the gear shift stage detection switch (shift stage number detection switch) 14 via the detection signal line DL. The air pressure can be controlled to the pressure in the air tank 15 or the atmospheric pressure. That is, the detection signal line DL is O
When it is N, the magnet valve 13 is closed on the atmosphere side. Therefore, the air pressure in the air cylinder 12 is high. However, the detection signal line DL is OFF
In the case of, the magnet valve 13 opens to the atmosphere side, so that the air pressure in the air cylinder 12 is reduced.

The shift stage detection switch 14 is turned off when the shift stage of the transmission is in the fifth speed, and turned on when the shift stage is in the first to fourth speeds.
The information is output to the detection signal line DL as detection information and is connected to the magnet valve 13. Further, the air tank 15 sends high-pressure air to the air cylinder 12 via the magnet valve 13.

With such a configuration, in the conventional maximum speed limiting device for a vehicle equipped with a diesel engine, when the shift speed reaches the maximum shift speed (for example, 5th speed), the shift speed detection switch 14 detects this and the detection signal line. Turn off DL. Then, since the magnet valve 13 opens the atmosphere side, the air pressure in the air cylinder 12 decreases. Then, the piston 12-1 in the air cylinder 12 is operated by the built-in spring 12-2 (moves to the right in the figure),
Drive the speed control lever 11 to change the maximum engine speed from 2400 rpm to 1800 rpm.
For example, the vehicle speed is 60 km / h
Controlled by.

Therefore, when there is an air leak or a wire breakage, the maximum speed limiting device is always operated, and the maximum rotation of the engine is controlled to about 1800 rpm at all gear positions. When the transmission is not in the highest gear (1st to 4th gear), the gear position detection switch 14 is turned on, high-pressure air is sent from the air tank 15 to the air cylinder 12, and the built-in spring 12-2 is compressed to compress the engine. The stopper of the maximum rotation of is set to the above-mentioned position of 2400 rpm.

[0009]

However, in such a conventional maximum speed limiting device for a vehicle equipped with a diesel engine, the transmission limits the maximum speed when the detection line is short-circuited due to a failure of the gear position detection switch. Even if it is in the gear that should be performed, there is a problem that the maximum rotation speed remains uncontrolled and the device does not operate properly.

The present invention was devised in view of the above-mentioned problems, and a dual switch is provided so that the device can properly operate even if the gear position detection switch is short-circuited. An object is to provide a maximum speed limiting device for a vehicle.

[0011]

Therefore, the maximum speed limiting device for a vehicle equipped with a diesel engine according to the present invention is a vehicle for which a diesel engine is mounted and the maximum speed is limited. A speed control lever attached to the pump, an actuator that can adjust the position of the speed control lever from a high speed position to a low speed position, and the position of the speed control lever via the actuator based on detection information input through a detection signal line. To a required engine speed limit position, and a gear position detection that turns off the detection signal line when a gear position which is interposed in the detection signal line to the control unit and should limit the maximum speed is detected. Means in series with the shift stage detection means in the detection signal line to the control unit. And a vehicle speed detecting means for turning off the detection signal line when the vehicle speed becomes equal to or higher than a predetermined value. Is detected or the vehicle speed detecting means detects that the vehicle speed has exceeded a predetermined value, the position of the speed control lever is configured to be set to a required engine speed limit position via the actuator. It is characterized by that (claim 1).

Further, the maximum speed limiting device for a vehicle equipped with a diesel engine of the present invention is a vehicle equipped with a diesel engine and the maximum speed of which is limited, and a speed control lever equipped with a fuel injection pump for the diesel engine. , An actuator capable of adjusting the position of the speed control lever from a high speed position to a low speed position, and based on detection information input through a detection signal line, the position of the speed control lever is limited to a required engine speed via the actuator. A control unit for setting the position, a gear position detecting means for turning on the detection signal line when detecting a gear position which is interposed in the detection signal line to the control unit and should limit the maximum speed, and to the control unit Is provided in parallel with the gear shift stage detecting means in the In the above case, the control section is provided with a vehicle speed detecting means for turning on the detection signal line, and the control section detects, through the detection signal line, a gear stage for which the maximum speed is to be limited by the gear stage detecting means, or When the vehicle speed detecting means detects that the vehicle speed exceeds a predetermined value, the position of the speed control lever is set to a required engine speed limit position via the actuator ( Claim 2).

[0013]

In the above maximum speed limiting device for a vehicle equipped with a diesel engine of the present invention, the shift speed detecting means detects the shift speed at which the maximum speed should be limited, or the vehicle speed detecting means. When it is detected that the vehicle speed has become equal to or higher than the predetermined value, the control section sets the position of the speed control lever to the required engine speed limit position via the actuator. This can limit the maximum speed.

[0014]

Embodiments of the present invention will be described below with reference to the drawings. (A) Description of First Embodiment FIG. 1 is a control block diagram showing a maximum speed limiting device for a vehicle equipped with a diesel engine as a first embodiment of the present invention. This device is shown in FIG. 3 as described above. It is mounted on such a semi-trailer 30.

In FIG. 1, 1 is a speed control lever, and this speed control lever 1 is attached to a fuel injection pump 7 for a diesel engine. Further, 2 is an air cylinder as an actuator, and this air cylinder 2 can adjust the position of the speed control lever 1 from a high speed position to a low speed position.

Reference numeral 3 is a magnet valve as a control unit. The magnet valve 3 changes the air pressure to the air cylinder 2 to the pressure in the air tank 6 or the atmospheric pressure based on the detection information input through the detection signal line DL. By operating in this manner, the air cylinder 2 is controlled, and the position of the speed control lever 1 is controlled to a required engine speed limiting position. More specifically, the magnet valve 3 is provided with a detection signal line DL,
When the shift speed detection switch 4 detects a shift speed at which the maximum speed should be limited, or when the vehicle speed detection switch 5 detects that the vehicle speed exceeds a predetermined value, the atmosphere side is opened and the air cylinder is opened. The position of the speed control lever 1 is set to the required engine speed limiting position [(a) in FIG. 1] via the switch 2.

By the way, the detection signal line DL includes
A gear position detection switch 4 as a gear position detection means and a vehicle speed detection switch 5 are provided in series. Here, the gear position detection switch 4 is in the ON state while the gear position does not need to limit the maximum speed (1st to 4th speeds), but detects the gear position (5th speed) to which the maximum speed should be limited. Then, it is turned off.

As described above, the vehicle speed detection switch 5 is provided in series with the gear position detection switch 4 in the detection signal line DL to the magnet valve 3, and is turned on when the vehicle speed is lower than a predetermined value. Is turned off when the voltage exceeds a predetermined value, the first switch 5-
1 and a relay coil 5-2. As described above, the vehicle speed detection switch 5 is configured as a relay switch, but the first switch 5-1 of the vehicle speed detection switch 5 is interposed in the detection signal line DL, and the relay coil 5-2 is the speed indicator lamp. Lighting circuit S
It is installed in C.

In the speed indicator lamp lighting circuit SC, a relay coil 5-2, a speed indicator lamp 8-1, and a second switch 8-2 are provided in series, and the second switch 8-2 is turned on. Then, the speed indicator lamp 8-1 is turned on and the relay coil 5-2 is excited. here,
The second switch 8-2 is turned on by the controller 8-3.
Although the N / OFF control is performed, the controller 8-3 uses the vehicle speed sensor 8-4 to control the vehicle speed to a predetermined value (for example, 6
0 km / h) or higher is detected, a control signal for turning on the second switch 8-2 is output.

Therefore, the vehicle speed detecting means 5, the vehicle speed detecting switch 5, the second switch 8-2, the controller 8-3 and the vehicle speed sensor 8-4 are constituted. The first switch 5-1 and the second switch 8-2 are configured such that when one of them is switched on, the other is switched off, and when the other is switched on, one of them is switched on.

Therefore, when the vehicle speed sensor 8-4 detects that the vehicle speed is higher than the predetermined value, the second switch 8-2 is turned on by the control signal of the controller 8-3.
Then, the speed indicator lamp 8-1 is turned on, the relay coil 5-2 is excited, and in response to this, the first switch 5-1 is turned off. In addition, 6 is an air tank, and this air tank 6 sends compressed air to the air cylinder 2 via the magnet valve 3 like the conventional one.

With the above-mentioned structure, in the maximum speed limiting device for the vehicle equipped with the diesel engine as the first embodiment of the present invention, when the transmission reaches the maximum speed (5th speed in this case), this is set to the speed detection switch 4. Detect and detect signal line D
Turn off L. When the traveling speed exceeds 60 km / h, the vehicle speed sensor 8-4 detects this and the second switch 8-2 is turned on by the control signal of the controller 8-3.
N, and in response to this, the relay coil 5-2 of the vehicle speed detection switch 5 is excited and the first switch 5-1 is turned off.
Becomes

When the second switch 8-2 is turned on, the speed indicator lamp 8-1 is turned on. Here, the gear position detection switch 4 is turned off, or the first switch 5-1 in the vehicle speed detection switch 5 is turned off.
Then, the magnet valve 3 opens the atmosphere side, and the air pressure in the air cylinder 2 decreases.

Then, the piston 2- in the air cylinder 2
1 is operated by a built-in spring 2-2 (moved to the right in the figure), and the maximum rotation of the engine is, for example, 2400 rpm.
From about 1800 rpm, the vehicle speed is controlled to 60 km / h. In addition, the transmission is not at the highest stage (fifth speed here), and the traveling speed is 60
When the speed does not exceed km / h, both the gear position detection switch 4 and the first switch 5-1 in the vehicle speed detection switch 5 are ON. Therefore, in this case, since the magnet valve 3 opens the air tank 6 side, the high-pressure air sent from the air tank 6 is sent to the air cylinder 2 via the magnet valve 3, and the maximum rotation of the engine becomes 2400 rpm.

By the way, the transmission is at the highest stage (5 in this case).
Speed) or the traveling speed exceeds 60 km / h, that is, the detection signal line DL is OFF.
Even if one of the gear position detection switch 4 and the vehicle speed detection switch 5 is short-circuited due to a failure, if the other switch is functioning normally, the switch is duplicated. , The device works properly.

If one of the gear position detection switch 4 and the vehicle speed detection switch 5 is broken due to a failure,
Since the detection signal line DL is turned off, the magnet valve 3 operates, whereby the position of the speed control lever 1 moves to the required engine speed limiting position [(a) in FIG. 1], so that the engine speed is increased. Limited. Therefore, even if the gear position detection switch 4 or the vehicle speed detection switch 5 is broken due to a failure, the device can operate properly.

Further, by using the vehicle speed detecting means used in the speed indicator circuit as a part of the vehicle speed detecting means 8, the parts can be shared, which greatly contributes to downsizing of the system. (B) Description of Second Embodiment FIG. 2 is a control block diagram showing a maximum speed limiting device for a vehicle equipped with a diesel engine as a second embodiment of the present invention. In FIG. 2, the detection signal line DL is not shown. Unlike the case of the first embodiment, the inverter circuit 9 is provided in front of the magnet valve 3 and the gear position detection switch 4 is provided.
b and the first switch 5b-1 of the vehicle speed detection switch 5b
Are connected in parallel with each other.

Since the speed control lever 1, the air cylinder 2, the magnet valve 3, the air tank 6, and the speed indicator lamp 8-1 are the same as those in the first embodiment, the description thereof will be omitted. By the way, as can be understood from the above description, the gear shift stage detection switch 4b as the gear shift stage detection means is provided in the detection signal line DL.
And a vehicle speed detection switch 5b as vehicle speed detection means are provided in parallel.

Here, the gear position detection switch 4b is turned off during a gear position (1st to 4th gear) where the maximum speed is not limited.
However, when the shift stage (5th speed) for which the maximum speed should be limited is detected, the ON state is set. Further, the vehicle speed detection switch 5b is, as described above, connected to the gear position detection switch 4b in the detection signal line DL to the magnet valve 3.
It is installed in parallel with the vehicle speed and has a predetermined speed (for example, 60 km /
If it is smaller than h), it will be in the OFF state, but if it is above the above-mentioned predetermined value, it will be in the ON state, and is configured to include the first switch 5b-1 and the relay coil 5b-2.

Thus, this vehicle speed detection switch 5b
Is configured as a relay switch, the first switch 5b-1 of the vehicle speed detection switch 5b is provided in the detection signal line DL, and the relay coil 5b-2 is provided in the speed indicator lamp lighting circuit SCb. There is. Furthermore, this speed indicator lamp lighting circuit SCb
, A relay coil 5b-2, a speed indicator lamp 8-1, and a second switch 8b-2 are interposed in series. When the second switch 8b-2 is turned on, the speed indicator lamp 8-1 is turned on. At the same time, the relay coil 5b-2 is excited.

Here, the second switch 8b-2 is ON / OFF controlled by the controller 8-3, and the controller 8b-3 uses the vehicle speed sensor 8b-4 so that the vehicle speed is equal to or higher than a predetermined value (for example, 60 km / h), the second
A control signal for turning off the switch 8b-2 is output. Therefore, the vehicle speed detecting switch 5b, the second switch 8b-2, the controller 8b-3 and the vehicle speed sensor 8b-4 constitute a vehicle speed detecting means 8b.

The first switch 5b-1 and the second switch 8b-2 are configured such that when one of them is switched on, the other is switched off, and when the other is switched on, one of them is switched on. ing. Therefore, when the vehicle speed sensor 8b-4 detects that the vehicle speed is equal to or higher than the predetermined value, the second switch 8b-2 is turned off by the control signal of the controller 8b-3, and the speed indicator lamp 8-1 is turned off. At the same time, the relay coil 5b-2 is excited, and in response to this,
The first switch 5b-1 is turned on.

That is, it is understood that the relationship between the speed indicator lamp lighting circuit SCb and the vehicle speed detection switch 5b is the same as that of the speed indicator lamp lighting circuit SC and the vehicle speed detection switch 5 in the above-described first embodiment. The inverter circuit 9 includes a detection signal line D
The signal output from L to the magnet valve 3 is inverted. That is, when the detection signal line DL is OFF (the gear position detection switch 4b and the vehicle speed detection switch 5b).
Is OFF), the inverter circuit 9 outputs an ON signal, and when the detection signal line DL is ON (when either or both of the gear position detection switch 4b and the vehicle speed detection switch 5b are ON), The inverter circuit 9 is OF
The F signal is output. With the configuration described above, in the maximum speed limiting device for the vehicle equipped with the diesel engine as the second embodiment of the present invention, the transmission has the maximum speed (here, 5).
When the speed is reached, the gear position detection switch 4b detects this and turns on the detection signal line DL.

When the traveling speed exceeds 60 km / h, the vehicle speed sensor 8b-4 detects it and the second switch 8b-2 is turned on by the control signal of the controller 8b-3.
In response to this, the relay coil 5b-2 of the vehicle speed detection switch 5b is excited and the first switch 5b-1 is turned on. Here, when the gear position detection switch 4b is turned on or the first switch 5b-1 in the vehicle speed detection switch 5b is turned on, the output of the detection signal line DL is inverted by the inverter circuit 9, and the magnet valve 3 is turned on. Since the OFF signal is input to open the atmosphere, the air pressure in the air cylinder 2 decreases.

Then, the piston 2- in the air cylinder 2
1 is operated by a built-in spring 2-2 (moved to the right in the figure), and the maximum rotation of the engine is, for example, 2400 rpm.
From about 1800 rpm, the vehicle speed is controlled to 60 km / h. In addition, the transmission is not at the highest stage (fifth speed here), and the traveling speed is 60
When it does not exceed km / h, both the gear position detection switch 4b and the first switch 5b-1 are OFF. As a result, the output of the detection signal line DL is inverted by the inverter circuit 9, and the magnet valve 3 has an O
The high pressure air sent from the air tank 6 when the N signal is input is sent to the air cylinder 2 via the magnet valve 3 so that the maximum engine speed becomes 2400 rpm.

By the way, the transmission is at the highest stage (5 in this case).
Speed) or the traveling speed exceeds 60 km / h, that is, the detection signal line DL is OFF.
When one of the gear position detection switch 4b or the vehicle speed detection switch 5b is short-circuited due to a failure, if the other switch is functioning normally, the switch is duplicated. , The device works properly.

Further, when the detection signal to the magnet valve 3 is ON, the shift stage detection switch 4b
Alternatively, when one of the first switches 5b-1 is broken due to a failure, the magnet valve 3 causes the inverter circuit 9
When the speed control lever 1 moves to the required engine speed limiting position [(a) in FIG. 2] by receiving the OFF signal which is the output from the engine and discharging the air, the engine speed is limited. Therefore, proper operation is ensured even if a failure occurs.

Further, as in the first embodiment described above, the vehicle speed detecting means used in the speed indicator circuit is used as a part of the vehicle speed detecting means 8b, so that parts can be shared and the system can be downsized. Can be planned. (C) Others In the first and second embodiments described above, the magnet valve 3 is
While the signal from the detection signal line DL is in the ON state, the air tank 6 side is opened, and while it is in the OFF state, the atmosphere side is opened.

However, the magnet valve 3 can be opened in reverse. That is, the atmosphere side is opened while the signal from the detection signal line DL is in the ON state,
While in the OFF state, the air tank 6 side is opened. However, in order to apply this magnet valve in the first embodiment, it is necessary to install an inverter circuit for inverting the signal from the detection signal line DL, and in order to apply it in the second embodiment. ,
The inverter circuit 9 is not necessary.

[0040]

As described in detail above, the maximum speed limiting device for a vehicle equipped with a diesel engine of the present invention is a fuel injection pump for a diesel engine in a vehicle equipped with a diesel engine and the maximum speed of which is limited. The attached speed control lever, an actuator that can adjust the position of the speed control lever from a high speed position to a low speed position, and the speed control lever position via the actuator based on the detection information input through the detection signal line. A control unit for setting the rotation speed limit position, a gear position detection means for turning off the detection signal line when detecting a gear position which is interposed in the detection signal line to the control unit and should limit the maximum speed, It is installed in series in the detection signal line with the gear position detection means, and the vehicle speed is a predetermined value. The control section includes a vehicle speed detecting means for turning off the detection signal line when the upper side is turned up, and the control section detects, through the detection signal line, a gear position for which the maximum speed should be limited or the vehicle speed detecting means detects the vehicle speed. When it is detected that the value exceeds a predetermined value, the detection signal line is short-circuited or disconnected due to a failure because the position of the speed control lever is configured to reach the required engine speed limit position via the actuator. Even in this case, there is an advantage that the device operates properly.

The maximum speed limiting device for a vehicle equipped with a diesel engine of the present invention is a vehicle equipped with a diesel engine and the maximum speed is limited, and a speed control lever equipped with a fuel injection pump for the diesel engine, An actuator that can adjust the position of the speed control lever from a high speed position to a low speed position, and control to set the position of the speed control lever to the required engine speed limit position via the actuator based on the detection information input through the detection signal line. Section, a gear position detecting means which is interposed in a detection signal line to the control unit and turns on the detection signal line when a gear position to limit the maximum speed is detected, and a gear position detection in the detection signal line to the control unit It is installed in parallel with the means and detects when the vehicle speed exceeds a predetermined value. The vehicle speed detecting means for turning on the line is provided, and the control section detects, through the detection signal line, the gear position for which the maximum speed should be limited by the gear position detecting means, or the vehicle speed detecting means makes the vehicle speed equal to or higher than a predetermined value. If it is detected that the speed control lever is set to the required engine speed limit position via the actuator, the detection signal will be short-circuited or disconnected due to a failure, as in the case above. Even if it does, there is an advantage that proper operation can be secured.

[Brief description of drawings]

FIG. 1 is a control block diagram showing a first embodiment of the present invention.

FIG. 2 is a control block diagram showing a second embodiment of the present invention.

FIG. 3 is a diagram showing a semi-tractor.

FIG. 4 is a control block diagram showing a conventional example.

[Explanation of symbols]

1,11 Speed control lever 2,12 Air cylinder 2-1, 12-1 Piston 2-2,12-2 Spring 3,13 Magnet valve (control part) 4,4b, 14 Gear position detection switch (gear position detection means) 5,5b Vehicle speed detection switch 5-1,5b-1 First switch 5-2,5b-2 Relay coil 6,15 Air tank 7,16 Fuel injection pump 8,8b Vehicle speed detection means 8-1 Speed indicator lamp 8-2 , 8b-2 Second switch 8-3, 8b-3 Controller 8-4, 8b-4 Vehicle speed sensor 9 Inverter circuit 20 Semi-tractor 30 Semi-trailer DL detection signal line SC, SCb Speed indicator lamp lighting circuit

Claims (2)

[Claims] 1. A vehicle equipped with a diesel engine, the maximum speed of which is limited, a speed control lever provided with a fuel injection pump for the diesel engine, and a position of the speed control lever from a high speed position to a low speed position. Based on the adjustable actuator and the detection information input through the detection signal line,
A control unit for setting the position of the speed control lever to a required engine speed limiting position via the actuator, and a gear stage which is interposed in the detection signal line to the control unit to limit the maximum speed are detected. A gear position detecting means for turning off the detection signal line and a detection signal line to the control section are provided in series with the gear position detecting means, and turn off the detection signal line when the vehicle speed exceeds a predetermined value. The vehicle speed detecting means, the control unit detects, through the detection signal line, a gear position for which the maximum speed is to be limited by the gear position detecting means, or the vehicle speed detecting means makes the vehicle speed equal to or higher than a predetermined value. When it is detected, the speed control lever is configured to move the speed control lever to a required engine speed limit position via the actuator. Maximum speed limiting device le engine equipped vehicle. 2. A vehicle equipped with a diesel engine, the maximum speed of which is limited, and a speed control lever provided with a fuel injection pump for the diesel engine and a position of the speed control lever from a high speed position to a low speed position. Based on the adjustable actuator and the detection information input through the detection signal line,
A control unit for setting the position of the speed control lever to a required engine speed limit position through the actuator, and a gear position which is interposed in the detection signal line to the control unit to limit the maximum speed are detected. The gear position detecting means for turning on the detection signal line and the detection signal line to the control unit are provided in parallel with the gear position detecting means, and turn on the detection signal line when the vehicle speed becomes a predetermined value or more. The vehicle speed detection means, the control unit detects, through the detection signal line, a gear position at which the maximum speed is to be limited by the gear position detection means, or the vehicle speed detection means causes the vehicle speed to exceed a predetermined value. When it is detected, the speed control lever is configured to move the speed control lever to a required engine speed limit position via the actuator. Maximum speed limiting device le engine equipped vehicle.