JP2001225673A - Vehicle speed limiting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable a driver to arbitrarily change a limiting value in a vehicle speed limiting device which controls the vehicle speed so that it may not exceed the limiting value. SOLUTION: Where there is no limiting value set from the outside, a shift lever 4A is operated n an upshift position and, when a prescribed time T1 is elapsed in its state, a display 43 is lit (Steps 3-7). A vehicle speed value at that time is set to a limit value and a vehicle speed limit start flag is set (Step 8). In a prescribed time T2, when the shift lever 4A is returned, the vehicle speed limit value and vehicle speed limit start flag are cleared and a display is put out (Step 9 - Step 12).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to an improvement in a vehicle speed limiting device.

[0002]

2. Description of the Related Art There is disclosed a vehicle speed limiting device for controlling an amount of fuel supplied to an engine so that the vehicle speed does not exceed a limit value, in which a driver can arbitrarily select a vehicle speed limit and release thereof. (See Japanese Patent Application No. 9-61112).

[0003]

In commercial vehicles such as trucks, the vehicle speed limit is often set by a vehicle operation manager to improve fuel efficiency. The vehicle speed limitation has an advantage that the driver can easily drive (accelerator operation) on a highway or the like because the vehicle speed does not greatly exceed the limit value even when the accelerator operation amount is kept close to 100%. is there. In the conventional example described above,
If a vehicle speed exceeding the limit value is required due to road conditions (such as how the vehicle is flowing), the driver can release the vehicle speed limit and run at a vehicle speed exceeding the limit value.
The accelerator operation amount must be adjusted to the vehicle speed that follows the flow of the vehicle, and the advantage of the vehicle speed limiting device cannot be used during that time.

An object of the present invention is to provide an effective countermeasure for solving such a problem.

[0005]

According to a first aspect of the present invention, there is provided a vehicle speed limiting device for controlling a vehicle speed so as not to exceed a limit value. Means for newly setting or changing a limit value for the vehicle speed.

According to a second aspect of the present invention, in a vehicle speed limiting device for controlling a vehicle speed so as not to exceed a limit value, if a shift-up operation of a shift lever is performed when a gear position of a transmission is at a highest gear during release of the limit. Means for changing the limit value to the vehicle speed at that time.

According to a third aspect of the present invention, there is provided a vehicle speed limiting device for controlling a vehicle speed so as not to exceed a limit value, a means for canceling a vehicle speed limit, and a shift up request, a shift down request, a neutral request, and a neutral request in response to a shift lever operation. A means for selectively generating a reverse request and a hold request; and, when a gear position of the transmission is at the highest gear position, the shift lever is operated to a position at which a shift-up request is generated, and within a predetermined time after a specified time has elapsed in that state. Means for setting or changing a limit value for the vehicle speed at that time when the shift lever is returned to the vehicle.

According to a fourth aspect of the present invention, there is provided a vehicle speed limiting device for controlling a vehicle speed so as not to exceed a limit value, a means for releasing a vehicle speed limit, and a shift-up request, a shift-down request, a neutral request, and a neutral request in response to a shift lever operation. Means for selectively generating a reverse request and a hold request; and setting or newly setting a limit value for the vehicle speed at that time when a shift-up request is repeatedly generated a predetermined number of times within a predetermined time when the transmission gear position is at the highest gear position. Changing means.

According to a fifth aspect of the present invention, there is provided a vehicle speed limiting device for controlling a vehicle speed so as not to exceed a limit value, and means for canceling a vehicle speed limit, and when a depression and release of a clutch pedal are performed within a predetermined time, Means for changing the limit value to the vehicle speed.

[0010]

According to the first to fifth aspects of the present invention, it is possible to set a limit value for the vehicle speed at that time by performing a predetermined operation while the vehicle speed limit is released. For this reason, it is possible to drive the vehicle while limiting the speed with an arbitrary limit value suitable for the road condition.

[0011]

1 is a diesel engine, 2 is a clutch, 3 is a transmission, and an output shaft of the transmission 3 is connected to a rear axle via a propeller shaft (not shown). The engine fuel injection pump is provided with a governor device 1A for controlling the accelerator lever, the clutch 2 is provided with a clutch booster 2A for performing the on-off operation, and the transmission 3 is provided with a gear shift unit 3A for driving the gear shift mechanism. Reference numeral 27 denotes a supply / discharge valve of the clutch booster 2A.

[0012] As a detection means necessary for vehicle shift control,
Engine rotation sensor 29 for detecting engine rotation speed
, An accelerator opening sensor 28 for detecting the amount of depression of the accelerator pedal 7 (accelerator opening), a clutch stroke sensor 22 for detecting the stroke position of the clutch 2, and a gear position sensor (gear shift) for detecting the shift position of the transmission 3. (Built into unit 3A)
And a vehicle speed sensor 21 for detecting the rotation speed of the output shaft.
And a gear rotation sensor 23 that detects the rotation speed of the main gear that idles on the main shaft.

Manual control of clutch 2 (manual operation)
And automatic control, clutch switches 24 and 25 for detecting an initial position and an operating position of the clutch pedal are provided. A shift lever unit 4 is provided in a cab as a shift operation means of the transmission 2. The shift lever unit 4 selectively generates a shift up request, a shift down request, a neutral request, a reverse request, and a hold request according to the position of the shift lever 4A. The knob of the shift lever 4A automatically shifts to an optimal gear position according to the running state of the vehicle (vehicle speed and accelerator opening) and shifts according to a request signal of the shift lever 4A. Switch 5 for arbitrarily switching between manual shift mode and
Is provided.

The driver's cab is provided with a monitor 13 provided with a transmission position display lamp and the like, and a brake pedal switch 26 for detecting depression of a brake pedal (not shown). Will be added. Further, a buzzer 13A for alarming the release and start of the vehicle speed limit and a display 43 for notifying a standby state in which a limit value to be described later can be changed are arranged in the driver's cab.

The engine control unit 12 and the transmission control unit 11 control the shift operation of the vehicle, the vehicle speed limitation, the release thereof, and the change of the limit value based on various detection signals. Serial communication (LA
N). Regarding a shift operation of the vehicle, when a shift request based on a lever operation of the shift lever unit 4 or a shift request based on a running state of the vehicle is generated, a series of shift operations is controlled to shift gears to the requested position. That is, if the transmission 3 is not neutral after the clutch 2 is disconnected, the gear is removed. When the main gear rotation speed enters the synchronization region while controlling the engine rotation speed as necessary, the transmission 3 is engaged.

The transmission control unit 11 is a storage means (not shown) for storing a vehicle speed limit value.
Is provided. Further, input means 41 for inputting a limit value for externally setting the stored value is provided. And
During the vehicle speed limitation, a vehicle speed limitation command for controlling the fuel injection amount of the engine 1 so that the vehicle speed does not exceed the limit value is output to the engine control unit 12 when a predetermined cancellation operation is performed. When receiving the vehicle speed limit command, the engine control unit 12 controls the fuel injection amount of the engine 1 as necessary so as not to exceed the engine rotation speed corresponding to the limited vehicle speed. Further, upon receiving the restriction release command, the mode is switched to the normal engine control, and the fuel injection amount of the engine 1 is controlled according to the accelerator opening.

The transmission control unit 11 has a limit value input means 4 for setting externally.
In addition to 1, a function for setting a limit value of the storage means is added. FIG. 2 is a flowchart for explaining the control content related to the setting of the limit value. In step 1, the gear position of the transmission 3 is read. In step 2, it is determined whether the gear position is at the highest gear position. If the determination is no, the process jumps to step 14 to clear the vehicle speed limit value and the vehicle speed limit start flag in the storage means.
That is, while the vehicle speed limit is released, if the determination in step 2 is yes, the process proceeds to step 3. In step 3, it is determined whether there is a stored value of the vehicle speed limit set from outside. When the determination in step 2 is yes and the determination in step 3 is yes, it is determined that the vehicle speed restriction has been once released, and the process proceeds to step 4. Step 3
Is NO, the process is immediately terminated.

In steps 4 to 6, the shift lever 4A is operated to the position where the upshift request is generated (upshift position), and in this state, the specified time T1 (1s)
ec to about 3 seconds) has elapsed.
When these determinations are yes, in step 7,
The indicator 43 in the cab is turned on. In step 8, the detection value of the vehicle speed sensor 21 is read, and the value is newly set as a vehicle speed limit value, and a vehicle speed limit start flag is set. If the determination in step 4 is no,
The process ends immediately.

In steps 9 and 10, the shift lever 4A is moved from the shift-up position to the initial position (position at which a hold request is generated) while a predetermined time T2 (about 10 seconds) elapses from the start of pressing the shift lever 4A. Determine if it is returned. Step 9
If the determination in step 10 is affirmative with the determination of no, in step 11, the vehicle speed limit value and the vehicle speed limit start flag in the storage means are cleared. In step 12, while the display 43 is turned off, if the determination in step 10 is yes (that is, the shift lever 4A is returned to the initial position within the predetermined time T2), the display 43 is turned off in step 13. Turns off.

When the vehicle speed limit start flag is set, the transmission control 11 executes a vehicle speed limit command based on the last stored vehicle speed limit value in step 7 until the vehicle speed limit start flag is cleared (cleared). Is output to the engine control unit 12.

FIG. 3 is a time chart for explaining the contents of this control.
When the shift lever 4A is returned to the initial position within the predetermined time T2 after the specified time T1 has elapsed in the state where the gear A is operated to the shift-up position, the vehicle speed limitation is started with the vehicle speed at that time as the limit value. . While the vehicle speed is being limited, the vehicle speed does not exceed the stored vehicle speed limit value even if the accelerator pedal is depressed to 100%. When the accelerator is returned, the speed is reduced according to the accelerator opening.

With this configuration, during the vehicle speed limitation, the fuel injection amount of the engine 1 is controlled so that the vehicle speed does not exceed the limit value. This limit value can be changed to the vehicle speed at that time by performing a shift-up operation of the shift lever 4A when the transmission 3 is at the highest gear. Therefore, on an expressway or the like, it is possible to drive the vehicle while limiting the vehicle speed with an arbitrary limit value suitable for the flow of the vehicle.

In this case, by setting the prescribed time T1, it is possible to prevent the limit value from being carelessly set (changed) due to erroneous operation of the shift lever 4A. Also,
When the shift lever 4A is held at the shift-up position for the specified time T1 or more, the display 43 is turned on (informing that the setting operation of the limit value is being performed). Can be changed appropriately.

FIG. 4 is a flow chart for explaining another control content relating to the change of the limit value. In steps 1 to 3, it is determined whether the gear position of the transmission 3 is at the highest gear position or not. Determines if there is no value. If these determinations are yes, it is determined that the vehicle speed restriction has been once released, and the routine proceeds to step 4. In steps 4 and 5, the count T of the timer is started from the start of pressing the shift lever 4A. Then, in steps 6 to 8,
It is determined whether the shift lever 4A is reciprocated a predetermined number of times between the shift-up position and the position (initial position) where the hold request is generated. If these determinations are yes, it is determined in step 9 whether the reciprocating operation of the shift lever has been performed within a predetermined time t1 (during T <t1). If this determination is yes, step 10
In step 11, the lamp 42 (see FIG. 1) of the monitor 13 is turned on, and in step 11, the vehicle speed sensor 21 is turned on.
Is read, the value is newly set as a vehicle speed limit value, and a vehicle speed limit start flag is set. If the determination in step 2 is no, jump to step 10,
The vehicle speed limit value and the vehicle speed limit start flag in the storage means are cleared. If any of steps 3, 4, and 6 to 9 is no, the process is immediately terminated.

When the vehicle speed limit start flag is set, the vehicle speed limit start flag is deleted (the vehicle speed limit is released).
During this period, a vehicle speed limit command based on the stored limit value is output to the engine control unit 12.

FIG. 5 is a time chart for explaining the contents of this control.
When A is reciprocated between the shift-up position and the initial position, and a shift-up request is issued twice within a predetermined time t1, the lamp 42 of the monitor 13 is lit from that point on and the vehicle speed at that time is reduced. Vehicle speed limitation is started with the limit value as the limit value.

With this configuration, the shift lever 4A is reciprocated between the shift-up position and the hold position twice within the predetermined time t1 when the transmission 3 is at the highest gear during release of the vehicle speed limit. Thus, the limit value can be changed to the vehicle speed at that time. Compared to the control contents of FIG. 2, the shift lever 4A is used to change the limit value.
Does not need to be held at the shift-up position for the specified time T1 or more, so that there is an advantage that the usability is good.

FIG. 6 is a flowchart for explaining another control content relating to the change of the limit value.
In step 3, it is determined whether the gear position of the transmission 3 is the highest gear position and whether there is a vehicle speed limit value set from outside. If these determinations are yes, it is determined that the vehicle speed restriction has been once released, and the routine proceeds to step 4. In steps 4 and 5, the count T of the timer is started from the start of turning off the clutch switch 24 (depressing the clutch pedal). Then, in step 6, it is determined whether or not the clutch switch 24 (see FIG. 1) has been turned on. If this determination is yes, it is determined in step 7 whether the clutch switch 24 has been turned off and on within a predetermined time t. If the determination is yes, in steps 8 and 9, the lamp 42 of the monitor 13 is turned on, the detection value of the vehicle speed sensor 21 is read, the value is newly set as the vehicle speed limit value, and the vehicle speed limit start is started. Set a flag. If the determination in step 2 is no, the process jumps to step 10 and clears the vehicle speed limit value and the vehicle speed limit start flag in the storage means. Step 3,
If any of Steps 4, 6, and 7 is no, the process is immediately terminated.

When the vehicle speed limit start flag is set, the transmission control 11 transmits a vehicle speed limit command based on the changed limit value to the engine until the vehicle speed limit start flag is cleared (the vehicle speed limit is released). This is output to the control unit 12.

With this configuration, while the vehicle speed limit is being released, the clutch switch 24 is turned off and on within a predetermined time t by performing the operation of depressing and releasing the clutch pedal when the transmission 3 is at the highest gear position. The limit value can be changed to the vehicle speed at that time.
The clutch switch 24 detects the initial position of the clutch pedal. It is not necessary to fully operate the clutch pedal to turn the clutch pedal off and on, and the limit value is changed without interrupting the clutch 2. It is also possible to do. Of course, a signal from the clutch switch 25 for detecting the operating position of the clutch pedal may be used instead.

Although not shown, as another embodiment, a special switch is provided in the means for releasing the vehicle speed restriction, and when this switch is turned on, the vehicle speed restriction is released, while it is turned off (while the vehicle speed restriction is being released). And the vehicle speed at that time may be used as the limit value to start the vehicle speed limitation.

[Brief description of the drawings]

FIG. 1 is an overall configuration diagram showing an embodiment of the present invention.

FIG. 2 is a flow chart for explaining control contents for changing a vehicle speed limit.

FIG. 3 is a time chart for explaining control contents relating to a change in vehicle speed limitation.

FIG. 4 is a flowchart illustrating another control content relating to a change in vehicle speed limit.

FIG. 5 is a time chart for explaining control contents relating to a change in vehicle speed limitation.

FIG. 6 is a flowchart illustrating another control content relating to a change in the vehicle speed limit.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1A Governor device of fuel injection pump 4 Shift lever unit 4A shift lever 11 Transmission control unit 12 Engine control unit 21 Vehicle speed sensor 24 Clutch switch 28 Accelerator opening sensor 29 Engine rotation sensor 41 Vehicle speed limit value input means 42 Vehicle speed limit display lamp 43 Vehicle speed Display unit in limit value change standby state

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Tetsuhisa Hayashi Nissan Diesel Kogyo Co., Ltd. Incorporated F term (reference) 3D041 AA76 AC02 AC06 AC15 AD02 AD10 AD18 AD31 AE14 AE31 3G093 AA05 AB01 BA07 BA24 CB08 DA01 DA06 DB05 DB10 DB13 DB23 EB02 EB03 FB05

Claims (5)

[Claims] 1. A vehicle speed limiting device for controlling a vehicle speed so as not to exceed a limit value, means for releasing a vehicle speed limit, and when a predetermined special operation is performed, a new limit value is set or changed for the vehicle speed at that time. Means for controlling the vehicle speed. 2. A vehicle speed limiting device for controlling a vehicle speed so as not to exceed a limit value, wherein when a shift-up operation of a shift lever is performed while a gear position of a transmission is at a highest gear during release of the limit, the vehicle speed at that time is controlled. Means for changing the limit value. 3. A vehicle speed limiting device for controlling a vehicle speed so as not to exceed a limit value, means for releasing a vehicle speed limit, and a shift up request, a shift down request, a neutral request, a reverse request, and a hold in response to a shift lever operation. Means for selectively generating a request, and when the gear position of the transmission is at the highest gear position, the shift lever is operated to the position where the shift-up request is generated, and after a specified time has elapsed in that state, the shift lever is moved within a predetermined time. Means for setting or changing a limit value for the vehicle speed at that time when the vehicle is returned. 4. A vehicle speed limiter for controlling a vehicle speed so as not to exceed a limit value, means for canceling a vehicle speed limit, and a shift up request, a shift down request, a neutral request, a reverse request, a hold request according to a shift lever operation. Means for selectively generating a request, and means for newly setting or changing a limit value for the vehicle speed at that time when a shift-up request is repeatedly generated a predetermined number of times within a predetermined time when the transmission gear position is at the highest gear position. A vehicle speed limiting device comprising: 5. A vehicle speed limiting device for controlling a vehicle speed so as not to exceed a limit value, means for canceling a vehicle speed limit, and limiting the vehicle speed at a time when a clutch pedal is depressed and released within a predetermined time. Means for changing a value.