JP3496467B2 - Constant speed traveling equipment for vehicles - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [0001] BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle speed control system.
The present invention relates to a constant speed traveling device for a vehicle that performs control. [0002] 2. Description of the Related Art Conventionally, operation of a driving device has been easy.
Demand for automation and automation is increasing, and transmissions
Automation and constant speed driving control (auto cruise control)
A constant-speed traveling device is being developed. this
In such a cruise control system, generally,
Set the vehicle speed when the switch is on as the target vehicle speed,
The constant-speed running control is performed so as to maintain the target vehicle speed. [0003] Of course, in order to maintain constant speed traveling,
Sometimes it is necessary to switch gears.
Control gear shift control together with engine output control.
It is necessary. For this reason, the automatic transmission changes the gear position.
Switch to the one appropriate for the driving condition and maintain the target vehicle speed
Like that. [0004] However, this is not the case.
In such a conventional constant-speed traveling device, the automatic transmission
Switch gears to those suitable for driving conditions and maintain target vehicle speed
But the vehicle deceleration (negative acceleration)
If it is different, automatic gear shifting
May not be performed properly. For example, when traveling on a steep uphill road,
If the vehicle has a large payload, the deceleration of the vehicle will be large.
Enough to drive even when shifting down to secure the driving force.
When the power cannot be obtained and the target vehicle speed for constant speed traveling cannot be maintained
There is a case. On the other hand, for example, JP-A-6-34480
No. 2 discloses the actual vehicle speed of the vehicle and the target vehicle speed for constant speed driving.
Deviation from the road taking into account the gradient of the roadway and the loading status of the vehicle.
The target throttle opening is set by correcting the
If the target throttle opening is more than the set value, shift by one step
A down technique is disclosed. However, in this technique, the number of downshift steps
Is a single step, for example, on a steep uphill road, etc.
Shift down to secure driving force due to large deceleration
Stalls to maintain the target vehicle speed at constant speed
May not be possible. Shift down is 1
Because it is performed step by step, it takes time to recover to the target vehicle speed.
It takes time and the feeling is bad. The present invention has been made in view of such problems.
For example, when traveling on steep uphill roads or loading
When the magnitude of deceleration is large, such as when the amount is large,
Can maintain the target vehicle speed for constant speed driving without stalling
To provide a vehicle constant speed traveling device
And [0008] According to the first aspect of the present invention, there is provided:
In the vehicle constant speed device of the present invention, the target vehicle speed setting means
Set the target vehicle speed for constant speed driving. Also, the actual vehicle speed detection
The step detects the actual vehicle speed of the vehicle. Furthermore, deceleration
The detecting means detects the deceleration of the vehicle. And instructions
Means is detected by the actual vehicle speed detecting means during constant speed traveling
Target vehicle whose actual vehicle speed is set by the target vehicle speed setting means
SpeedIs less than the value obtained by subtracting the predetermined vehicle speed from
The amount is equal to or greater than the predetermined value and is detected by the deceleration detecting means.
The magnitude of the issued deceleration is greater than the magnitude of the first predetermined deceleration
, Look for a gear that is two or more gears less than the current gear.
While indicating as standard, it is detected by the actual vehicle speed detection means.
The actual vehicle speed is set by the target vehicle speed setting means.
It is less than the value obtained by subtracting the specified vehicle speed from the target vehicle speed, and
The injection amount is equal to or more than a predetermined value and the deceleration detecting means
The magnitude of the deceleration detected is the magnitude of the first predetermined deceleration.
And less than the magnitude of the first predetermined deceleration
The current gear position when it is greater than or equal to the second predetermined deceleration
Is set as the target speed by subtracting one speed fromThis instruction
Means for controlling the automatic transmission based on the instruction from the means.
Change gear position.On the other hand, the constant speed traveling control means
When it is determined that the vehicle speed is not less than the value obtained by subtracting the predetermined vehicle speed from the speed
The constant-speed running control by the fuel supply control is performed. [0009] [0010] [0011] BRIEF DESCRIPTION OF THE DRAWINGS FIG.
The form will be described. Vehicle constant speed according to the present embodiment
The traveling device transmits the gear shift command by manual operation
This is transmitted to the gearshift actuator as a signal
Manual shifter that can remotely control gear shift actuators
And the automatic shift mode, which performs an automatic shift
Equipped with a semi-automatic transmission that can switch between
First, semi-automatic
A description will be given of a gear type transmission device. The present semi-automatic transmission is illustrated in FIG.
As shown in FIG. 2, it is provided on vehicles such as trucks and buses.
Equipped with the diesel engine 1, the engine 1
The clutch mechanism 2 attached to the output section and the semi-automatic
Transmission 3 and semi-automatic transmission 3
Semi-automatic transmission control to control movement
Unit (Semi-automatic T / M control unit) 11
And the electronic governor control unit that controls the engine 1.
It has a unit 12. Here, the clutch mechanism 2 includes a clutch arm.
With clutch booster 2A functioning as a actuator
This clutch booster 2A is an air tank
31 according to the state of air supply from the clutch mechanism 2.
Disconnect and drive. Semi-automatic transmission 3, for example
For example, it has seven forward gears and one reverse gear,
Gear shift unit (GS
U) 3A is attached. This gear shift unit 3
A is the meshing of the gear mechanism of the semi-automatic transmission 3.
Shifting the gear to the required state while switching the state
To do. The clutch booster 2A, the gear shift
Control unit 3A and electronic governor 1A
Semi-automatic T / M control unit 11 for knit 10
And the electronic governor control unit 12
It is controlled through signals. For this reason,
Semi-automatic T / M control unit (shift control means)
11 is a change lever unit as a shift operation means.
G4, Set the target vehicle speed for constant speed driving (auto cruise)
Auto cruise set switch 5, semi-automatic transformer
Transmission gear for detecting the gear position of transmission 3
Sensor (not shown), clutch rotation speed (that is,
Clutch rotation for detecting the output rotation number of the latch mechanism 2)
Number sensor 22 and electronic governor control unit 12
Each is connected. An electronic governor control unit 1
2 includes a vehicle speed sensor (actual vehicle speed) for detecting the actual vehicle speed of the vehicle.
Speed detection means) 21 and an accessor attached to the accelerator pedal 7
Accelerator depression amount sensor 2 for detecting the depression amount of the pedal 7
4. Engine for detecting the rotation speed signal of the output shaft of the engine 1
Rotation speed sensor 23, electronic governor 1A, exhaust valve
Rake unit 9A, semi-automatic T / M control unit
Units 11 are connected to each other. Here, the shift lever unit 4
The pattern is N (neutral) as shown in FIG.
, R (reverse), D (drive), and H (hole)
), + (Shift up),-(shift down)
Of the I-type shift pattern with six positions
Has become. And, when you select the D position, it changes automatically.
Speed mode can be set.
The shift speed is held (ie, Hold) in the speed mode. What
In the H position, the shift mode is the manual shift mode.
It can also be called (manual) position. This
When operating from the H position to the + position above,
Command is output, and the
Then, a downshift command is output. By the way, such semi-automatic
The vehicle according to the present embodiment having the transmission type transmission device has
With an exhaust valve 8B disposed in the air passage 8
The constructed exhaust brake (auxiliary brake) 9 is also
The exhaust brake 9 is equipped with various
Electronic governor control unit 12 based on the information of
Exhaust brake unit through these electric signals
(Auxiliary brake actuating means) Controlled via 9A
It has become. It should be noted that the exhaust brake 9 is
The exhaust from the
So that it can be activated via the exhaust brake unit 9A.
It has become. Next, the constant speed running for the vehicle according to the present embodiment.
The row device will be described. The constant-speed traveling device for this vehicle
Electronic governor to perform high-speed driving (auto cruise)
The engine output is controlled by using the
Control the fuel supply system of the diesel engine,
Switching control and supplementary gear shifting of semi-automatic transmission 3
Operation control of exhaust brake 9 as auxiliary brake
Is performed. The constant-speed traveling device for a vehicle is shown in FIG.
Auto cruise sets as target vehicle speed setting means
Switch 5, constant speed traveling control means 101, deceleration calculating means
A configuration including a step 102 and vehicle load degree calculation means 103
And the semi-automatic T / M through the cruise control means 101
Clutch booster 2A by control unit 11
And control of the gear shift unit 3A,
Electronic governor control unit 12 through step 101
Control of the electronic governor 1A by the
1 through the exhaust brake unit 9A
Auto cruise by control of exhaust brake 9
The vehicle speed when the set switch 5 is turned on is the target vehicle speed.
And then perform auto cruise. Here, the auto cruise set switch 5
Is for setting auto cruise.
The auto cruise is set at the time of
Set vehicle speed as constant speed vehicle speed (target vehicle speed)
And outputs the target vehicle speed to the constant-speed traveling control means 101.
It is supposed to. Also, when off, the auto crew
Is released. The constant-speed running control means 101 includes a vehicle speed sensor 2
The actual vehicle speed detected by 1 is calculated by the target vehicle speed setting means 5.
Semi-automatic transformer to approach the set target vehicle speed
Change of gear stage to transmission control unit 11
Electronic governor as fuel supply means.
Instruct the engine 1A to control the engine output. What
Details will be described later. The deceleration calculating means 102 includes a vehicle speed sensor 21
Vehicle deceleration (negative actual
Acceleration), and the calculated deceleration is fixed.
The output is output to the high speed traveling control means 101. car
The both load degree calculating means 103 includes the vehicle speed sensor 21 and various sensors.
Load on the vehicle based on information from the switches 110
The state is calculated as the vehicle load degree.
To output the vehicle load degree to the constant speed traveling control means 101.
It has become. This vehicle load degree calculating means 103 is shown in FIG.
As shown, the engine torque calculating means 120 and the driving force
Calculating means 121, air resistance calculating means 122,
Tan road empty vehicle equivalent acceleration calculation means 123 and subtraction means 124
And the actual acceleration and energy of the vehicle.
Theoretical acceleration when the vehicle is on a flat road according to the fuel injection amount to the engine
The vehicle load degree is calculated based on the difference between the degrees. Among them, the engine torque calculating means 120
Is for calculating the engine torque T, and is shown in FIG.
To detect the position of the control rack (not shown)
Position information from the rack position detection sensor 26 (engine
Output instruction information) SRC and engine speed sensor 23
Map based on the engine speed information NE
It seeks engine torque. The driving force calculating means 121 calculates the engine torque
Based on the engine torque T obtained by the calculation means 120
Thus, the driving force F of the vehicle is calculated. Air resistance calculation
The output means 122 calculates the running resistance of the vehicle from the actual vehicle speed information V.
This is for calculating all the air resistances Rl. Straight flat road
Vehicle equivalent acceleration calculating means (hereinafter simply referred to as acceleration calculating means)
123 is the driving force calculating means 121 described above.
The driving force information F calculated by
From the calculated air resistance information Rl, when the vehicle is empty
Acceleration when accelerating on a straight road (hereinafter
(Referred to as “flat road empty vehicle equivalent acceleration”).
This straight flat road empty vehicle equivalent acceleration α₀ Is calculated by the following formula.
It is. [0026] α₀ = G · [F− (μW₀ + Rl)] / (W₀ + W_r) Here, g is the gravitational acceleration, μ is the road surface friction coefficient, W₀ Is empty
Weight, W_rIs the weight of the rotating part. In the subtraction means 124,
Equivalent to a straight flat road vehicle calculated by acceleration calculation means 123
Acceleration information α₀ And the actual acceleration information α from the vehicle speed sensor 21
And the load degree information α of the vehicle based on_VLIs calculated by the following equation.
It has become so. Α_VL= Α₀ −α And this α_VLFrom the magnitude of the value, how much vehicle load
Can determine whether the degree is large (or small)
Will be. This allows the vehicle to be
The shift-up timing can be changed according to the
To achieve low fuel consumption while maintaining driving performance.
Swell. Next, the constant speed traveling control means 101 will be described.
I will tell. This constant speed traveling control means 101 is as shown in FIG.
To achieve low fuel consumption by selecting the optimal stage
And maintain vehicle speed through automatic downshifting.
Shift-up control means 104 and shift-down control
Means 105, current stage holding control means 106, release means 1
07 and an exhaust valve as auxiliary brake control means
Rake control means 108 is provided. First, the shift up control means 104
Drive in the highest gear possible to achieve fuel economy
Whether it is possible to travel in the next stage (high speed stage) so that
And it is possible to drive at a speed higher than the current speed.
If any, shift up and set the target gear.
You. For this reason, the shift-up control means 104
Judge whether or not the condition of
If the conditions are met, it is determined that shift up is possible.
Is to be specified. Calculated by vehicle load degree calculating means 103
Vehicle load is less than or equal to the predetermined load αVL [vehicle
Load degree ≦ predetermined load degree αVL]. This means that the vehicle load is small.
In spite of being able to run on the next higher speed,
If driving at low speeds is maintained, fuel economy will deteriorate.
In consideration of the loading condition of the vehicle,
The vehicle load at the current shift stage (current stage) depends on the vehicle load level
Allow shift up when load is small
It is. As described above, the shift is performed according to the load state of the vehicle.
By increasing the vehicle speed, for example, the target vehicle speed on an uphill road
Even if is set, the traveling path becomes
If both loads are reduced, the upshift will occur,
The gear can be set to an appropriate speed, and fuel efficiency can be improved.
You can. The actual vehicle speed detected by the vehicle speed sensor 21
Near the target vehicle speed set by the loose set switch 5
Beside. That is, the actual vehicle speed is changed from the target vehicle speed to the predetermined vehicle speed CR.
Is greater than or equal to the value obtained by subtracting U [actual vehicle speed ≧ target vehicle speed−predetermined vehicle speed
CRU]. This is a shift haunch caused by a stall during shifting.
The actual vehicle speed is sufficiently close to the target vehicle speed to prevent
The shift up is allowed. What
The predetermined vehicle speed CRU is a value smaller than the predetermined vehicle speed CRD.
Is set. Then, the shift-up control means 1
04, if it is determined that upshifting is possible,
Set the gear that is one step higher than the current gear as the target gear
(Target stage ← current stage + 1 stage). Further, a shift-down control means 10 to be described later
5. The shift down performed by 5 is multiple steps,
Even when speeding up due to this downshift,
To increase speed and prevent fuel economy from deteriorating.
In order to reach the target vehicle speed,
Judge whether or not they meet all these conditions
If there is, it is determined that upshifting is possible. The engine speed sensor 23
The engine speed is equal to or higher than the specified value (NEV)
Inversion number ≧ specified value (NEV)]. This is the goal except on the uphill road
The vehicle speed is set and falls below the target vehicle speed while traveling on an uphill road.
Shift (ie, when the deceleration is large)
After gearing down and increasing to the target vehicle speed,
One gear shift before engine speed rises too low
It is intended to be up. Shift down control means (instruction means) 105
Is the driving force of the current gear to maintain the vehicle speed.
Shift down when greater driving force is required.
The target stage is set. This allows, for example,
Requires a large driving force like running on a slope
If you drive with the gear at the time of driving, the vehicle speed can be maintained.
If difficult, be instructed to shift down.
And the driving force can be restored, maintaining the vehicle speed.
Will be able to For this reason, the shift down control means 105
Is a downshift determination unit 105A and a stage number setting unit 1
05B. First, shift down judgment
The means 105A changes the current gear position to maintain the vehicle speed.
Driving force that is greater than the
Is to determine whether or not it is necessary to
When all conditions are satisfied, a larger driving force is required.
It is determined that it is important. An actual vehicle detected by the vehicle speed sensor 21
Speed set by auto cruise set switch 5
It is equal to or less than the value obtained by subtracting the predetermined vehicle speed CRD from the target vehicle speed.
Vehicle speed ≦ target vehicle speed−predetermined vehicle speed CRD]. Subject to this
The actual vehicle speed is higher than the target vehicle speed by more than the predetermined vehicle speed CRD
If it is low, the electronic governor control unit
Control by the electronic governor 1A through the
This is because automatic cruise is difficult with the lock control.
The predetermined vehicle speed CRD is a value larger than the predetermined vehicle speed CRU.
Is set as Electronic governor control unit 12
Set as a control amount of the electronic governor 1A by the
When the position voltage is equal to or lower than the specified voltage CRRD,
At least a predetermined value [Rack position voltage ≦ Specified voltage CRR
D]. This is to prevent accidental downshifts
Yes, if the rack position voltage is high, the electronic governor 1A
Fuel has already been injected in a sufficient amount.
It is difficult to increase the vehicle speed further by controlling
is there. The number-of-stages setting means 105B includes a shift
Downshift is required by the downshift determination means 105A.
Is determined according to the magnitude of the deceleration of the vehicle.
Set the number of steps of the
It is proportional to the magnitude of the deceleration calculated by step 102.
Thus, the number of downshift stages is set. As described above, the shift is performed according to the magnitude of the deceleration.
By setting the number of down steps, for example, steep climbing
Large deceleration when traveling on the road or when the load capacity is large
The required driving force can be ensured even if
It is possible to reliably maintain the target speed of auto cruise
I will be able to. Therefore, first, the stage number setting unit 105
B determines whether or not the following condition is satisfied.
If the conditions are met, set the number of downshifting steps to 2
Is set to. Calculated by the deceleration calculating means 102
The magnitude of the deceleration is a predetermined deceleration (first predetermined deceleration) αd
2 | [Deceleration | ≧ | Predetermined deceleration αd
2 |]. If this condition is not met, set the number of stages
Does the means 105B further satisfy the following conditions?
And if this condition is satisfied,
The number of stages is set to one. Calculated by the deceleration calculating means 102
The magnitude of the deceleration is a predetermined deceleration (second predetermined deceleration) αd
Is greater than or equal to 1 [| deceleration | ≧ | predetermined deceleration αd
1 |]. This is due to the loading condition of the vehicle and the grade of the road.
The degree of driving force required differs depending on the
The load condition of the vehicle and the gradient of the running path depend on the size of the vehicle.
Estimate and determine the number of downshift stages based on this
That's why. As described above, the deceleration detecting means 102
Depending on the magnitude of the detected deceleration,
If the magnitude of deceleration is small by changing
Shift down can be prevented,
In addition, the deceleration detecting means 10 is provided by the stage number setting means 105B.
The number of downshift stages proportional to the deceleration detected by 2
The optimal setting for returning to the target vehicle speed
The number of shift down stages can be set. Further, the predetermined deceleration αd1 is determined by the shift down stage.
Deceleration enough to recover driving force in one stage
And the predetermined deceleration αd2 is two-stage
Deceleration is enough to recover the driving force
Thus, the predetermined deceleration αd2 is larger than the predetermined deceleration αd1.
Is set as a value. But set up like this
Overrun (overrun)
Downshift control
In the means 105, the gear is shifted down by the set number of stages.
To determine whether or not an overrun will occur.
ing. Then, it is determined that overrun does not occur.
Is set, the number of steps set by the step number setting means 105B
The gear is one or two gears less than the current gear, depending on
Is set as the target stage. In other words, steps
The number of downshift stages set by the number setting means 105B
If the gear is one gear, look for a gear that is one gear less than the current gear.
Set as standard (target stage ← current stage-1 stage)
If the number of downshift stages set by stage 105B is two
In this case, the target gear is the gear that is two steps lower than the current gear.
(Target stage ← current stage-2 stages). On the other hand, when it is determined that overrun occurs
Is the number of downshift stages by reducing the number of downshift stages.
Is set. That is, the stage number setting means 1
When the number of downshift stages set by 05B is one
Does not shift down. Also,
Shift down gear set by gear number setting means 105B
If the number is two, reset it to one, and
Judge whether or not to run, and do not overrun
In such a case, the number of downshift stages is one, and the target stage is set.
(Target stage ← Current stage-1 stage), shift when overrun occurs
Not to down. The current position holding control means 106 switches the gear position.
Determines whether to perform auto cruise control by control
The automatic cruise control is performed by the speed change control.
If not, the gear should be kept at the current gear.
You. In this case, auto cruise only by fuel supply control
Is performed. For this reason, the current stage holding control means 106
Means that the change lever of the change lever unit 4 is manually
Either in the H position of the shift mode or in the automatic shift mode.
Judge whether it is in the D position and change lever unit.
If the change lever of G4 is in the H position,
The gear stage is maintained at the current gear stage without performing speed change control.
Power through the electronic governor control unit 12
Car cruise by fuel supply control of child governor 1A
It has become like. As a result, the driver can change
Set 4 change lever to H position or D position
Transmission
Automatic transmission through the control unit 11
Auto cruise by switching control of the gear stage of option 3;
Electronic governor through electronic governor control unit 12
Select auto cruise by fuel supply control of 1A
The driver can change the gear position according to the driver's preference.
Auto cruise control and gear shift control
There will be no auto cruise and you can choose. The release means 107 is provided with a change lever unit.
G4 change lever is N position, R position,
When operated to either + position or-position
If (ie not D position or H position)
Release the cruise control by the cruise control means 101
Things. This allows the shift lever to change gears
Switch gears by operation to adjust the vehicle speed consciously.
Will be able to For example, deceleration from high-speed driving
Sometimes downshifts without using the foot brake
Release the constant-speed running control by the release means 107
The engine can be decelerated by applying the engine brake.
I will be able to. The exhaust brake control means 108
When the actual vehicle speed is higher than the target vehicle speed for auto cruise
When the exhaust brake (auxiliary brake) 9 is forced
Exhaust brake unit 9A
An operation instruction is issued. Thus, for example, downhill
Actual vehicle speed exceeds target vehicle speed due to insufficient braking force when driving on the road
Even if it becomes, the exhaust brake 9
The target vehicle for auto cruise can secure the braking force
The speed can be maintained. In this case, the constant-speed running control means 101
Automatic transmission control unit through
Gear 11 of the semi-automatic transmission 3
Instructs to prohibit switching control, and the actual vehicle speed
If the vehicle speed is higher than the target vehicle speed, the
Prevent shift hunting by not decelerating
I am trying to. For this reason, the exhaust brake control means
Reference numeral 108 denotes an actual vehicle speed detected by the vehicle speed sensor 21.
The target vehicle speed set by the target vehicle speed setting means 5
Is larger than a value obtained by adding the key operation start determination value Vsb
[Actual vehicle speed> target vehicle speed + Vsb], and the actual vehicle speed
Value obtained by adding the auxiliary brake operation start determination value Vsb to the mark speed
If it is larger than this, activate the exhaust brake 9
To activate the exhaust brake unit 9A
It is supposed to do it. The constant speed traveling control means 1 constructed as described above
Gear shift control means based on the gear position instruction signal from
Semi-automatic T / M control unit 11
Change the setting of the automatic transmission 3
Clutch booster to switch to the changed gear stage
Clutch mechanism via 2A and gear shift unit 3A
To control 2 and semi-automatic transmission 3
Has become. The exhaust brake unit 9A
Is the exhaust brake system of the cruise control means 101
Based on the instruction signal from the control means 108, the exhaust
The operation of the brake 9 is controlled. What
Contact, the exhaust brake 9 is an exhaust brake
It is also activated by a signal from the switch 27,
Upon receiving an instruction signal from the exhaust brake control means 108,
If the exhaust brake switch 27
With or without these signals (that is, when the driver
In the case where you do not like the operation of the auxiliary brake
Also work. Incidentally, such a constant speed traveling control means 101
Cruise control by auto cruise set switch
5 is turned off and the foot brake (shown
Auto cruise is canceled when the driver is stepped on
It has become so. By the way, the change during auto cruise
The transition of the speed control is as shown in FIG. First, from the normal automatic shift control to the auto crew
The transition to automatic shift control satisfies all of the following conditions:
Sometimes done. ・ The auto cruise flag is 1. Where
The to-cruise flag indicates whether auto-cruise control is in progress.
Indicates whether or not auto cruise control is in progress.
1. Set to 0 when not in auto cruise control
It has become so. This auto cruise flag
When the auto cruise set switch 5 is turned on
Set to 1. Change of the change lever unit 4
The lever is in the D position. Next, Auto Cruise
From dynamic shift control to current gear holding control (hold mode)
The transition is performed when all of the following conditions are satisfied. ・ Change lever of change lever unit 4
It is a session. On the other hand, automatic gear
The transition to the automatic transmission control is performed when the following conditions are satisfied.
It is performed in. Change of the change lever unit 4
The lever is in the D position. ・ The auto cruise flag is 1. Next, from the automatic cruise automatic shift control to the normal automatic shift control
The transition to control is performed when one of the following conditions is satisfied.
Be done. -The auto cruise flag is 0. Here, the auto cruise flag is set to
The cruise set switch 5 turns off or
Exhaust brake switch 2 as an exhaust switch
7 is turned on or the foot brake is depressed
Set to 0 when any condition is satisfied. ・ Semi-automatic transmission control unit
11 and the electronic governor control unit 12.
There is an error in real communication. A constant-speed running for a vehicle as one embodiment of the present invention
Since the line device is configured as described above, for example,
Auto cruise control is performed according to the flowchart of 5.
Be done. In the auto cruise control of the present embodiment,
In addition to the fuel supply control, semi-automatic transmission
3 control for maintaining the current gear position (step S10, step
S190), the operation control of the exhaust brake 9 (step
Step S20, steps S100 to S120),
Switching control of the shift speed of the semi-automatic transmission 3
Step S30 to Step S80, Step S130 to Step
Step S180), for operation of the change lever unit 4
Release control of auto cruise (step S90)
For this reason, each of these controls will be separately described below. First, the current stage by the current stage holding control means 106
The holding control will be described. In step S10, automatic
Either gearshift mode or manual gearshift mode is selected.
That is, the chain of the change lever unit 4
When the lever is in the H position (HOLD
Is determined. In addition, H position
Otherwise, it is the D position in the automatic transmission mode. As a result of this determination, the H
Otherwise, the process proceeds to step S190.
The semi-automatic transmission by the current stage holding control means 106
The gear position of the third control is maintained at the current position, and the electronic governor control
Fuel supply of electronic governor 1A through roll unit 12
Auto cruise is performed by control. On the other hand, step S
Automatic shift when it is determined that it is not the H position in 10
Mode D position, the constant-speed traveling control means 1
01 through the exhaust brake control means 108.
Operation control of exhaust brake 9, semi-automatic transmission
Semi-automatic control through the
Switching control of gear stage of transmission 3 and change
Automatic cruise release system by operating lever unit 4
Perform an auto cruise while performing. First, the actual vehicle speed becomes higher than the target vehicle speed.
In the case of
Exhaust brake 9 for hunting
Deceleration control is performed. That is, in step S20,
Exhaust brake control means of high-speed traveling control means 101
108, the actual vehicle speed detected by the vehicle speed sensor 21
Is the target vehicle speed setting means of the auto cruise set switch 5
At the target vehicle speed set by 5
It is determined whether the value is greater than a value obtained by adding the constant value Vsb.
[Actual vehicle speed> Target vehicle speed + Vsb]. As a result of this determination, the actual vehicle speed is supplemented by the target vehicle speed.
It is larger than the value obtained by adding the brake operation start determination value Vsb
If it is determined that the
Exhaust by prohibiting shift control of dynamic transmission 3
The brake 9 is operated, and the process proceeds to step S110.
Next, in step S110, when the actual vehicle speed is lower than the target vehicle speed,
It is determined whether or not the vehicle speed is
If it is determined, the process returns to step S100, and the actual vehicle speed is set to the target.
Continue to operate the exhaust brake 9 until the vehicle speed falls below
When the actual vehicle speed falls below the target vehicle speed, step S1
Proceed to 20, and use the exhaust brake as an auxiliary brake
Release the operation of key 9. On the other hand, the actual vehicle speed has become lower than the target vehicle speed.
If you have a semi-automatic transmission control unit
Transmission of semi-automatic transmission 3 through gearbox 11
The stage switching control is performed. Of these, shift down
Constant speed cruise control by restoring the driving force is a step
S30 to step S80 and step S160 to step
This is performed by the process in step S180, and the fuel
The cruise control in consideration of cost improvement is performed in steps S130 to S130.
This is performed by the processing of step S150 and step S80. First, in step S30, the actual vehicle speed is set to the target vehicle speed.
It is determined whether the speed is less than the value obtained by subtracting the predetermined vehicle speed CRD from the speed.
(Actual vehicle speed ≦ target vehicle speed−predetermined vehicle speed CRD)
When the vehicle speed is less than the value obtained by subtracting the predetermined vehicle speed CRD from the target vehicle speed
Proceeds to step S40, and when the rack position voltage is low,
That is, shift down should be performed when the fuel injection amount is large.
In addition, the shift-down determination means 105A
It is determined whether the voltage is equal to or lower than the specified voltage CRRD. As a result of this determination, the rack position voltage
The pressure is equal to or less than CRRD, that is, the fuel injection amount is equal to or more than a predetermined value.
Is determined by the stage number setting means 105B.
Step S50 to Step
Step S80 and steps S160 to S180
Perform processing. That is, in step S50, the deceleration
It is determined whether or not the magnitude is equal to or greater than the magnitude of the predetermined deceleration αd2.
Judge [| deceleration | ≧ | predetermined deceleration αd2 |] and decelerate
Is larger than the predetermined deceleration αd2
If so, the process proceeds to step S60, where the current gear position is changed.
The gear that has been shifted down by two steps is set as the target step. Further, at step S70, the current gear stage
Overrun (overrun) when shifting down two steps from
To determine if there is a risk of
If there is no danger, the process proceeds to step S80,
Through the dynamic transmission control unit 11
To shift the semi-automatic transmission 3 to the target speed.
On the other hand, if there is a risk of overrun,
Proceeds to S170 and shifts down one stage from the current stage
Is set as the target stage, and in step S180,
Overshooting when shifting down one gear from the current gear
It is determined whether there is a risk of running. As a result of this determination, overrun may occur.
If not, the process proceeds to step S80, where the semi-automatic
Semi-automatic through the mission control unit 11
The transmission 3 is shifted to the target speed. On the other hand,
If there is a risk of balun, switch gears.
No. On the other hand, in step S50, the magnitude of the deceleration is
When it is determined that the value is not larger than the predetermined deceleration αd2
Proceeds to step S160, and further determines the magnitude of the deceleration.
It is determined whether or not the magnitude of the constant deceleration αd1 is equal to or greater than [|
Deceleration | ≧ | predetermined deceleration αd1 |], and as a result of this determination,
The magnitude of the deceleration is greater than or equal to the predetermined deceleration αd1
If it is determined that the current stage is
Set the target gear to the gear that has been shifted down by one gear,
Proceed to step S180. In step S180, starting from the current gear position
Overrun may occur when downshifting one stage
To determine if there is any, and there is no risk of overrun
If so, the process proceeds to step S80, where the semi-automatic transmission is performed.
Semi-automatic transfer through the
Shift the transmission 3 to the target speed. On the other hand, overrun
Do not switch gears if
No. In step S30, the actual vehicle speed is set to the target
It is determined that it is not less than the value obtained by subtracting the predetermined vehicle speed CRD from the vehicle speed.
And the rack position voltage is regulated in step S40.
If it is determined that the voltage is not lower than the constant voltage CRRD,
Shift-up control is performed in consideration of the improvement. First,
In step S130, the actual vehicle speed is changed from the target vehicle speed to a predetermined vehicle speed C.
It is determined whether the value is equal to or greater than the value obtained by subtracting RU. As a result of this determination, the actual vehicle speed is
If it is equal to or greater than the value obtained by subtracting the constant vehicle speed CRU, step S1
At 40, it is determined whether the vehicle load is equal to or less than avl,
If the vehicle load is less than avl, shift to the current stage by one stage
What is increased is set as a target stage, and step S80
To shift to semi-automatic transmission 3 to the target stage
I do. In step S145, the engine speed
The engine determines whether the number of turns is equal to or greater than a prescribed value (NEV),
If the rotation speed is equal to or greater than the specified value (NEV),
In S150, the gear shifted up by one gear to the current gear is set as the target gear.
And proceed to step S80, where the semi-automatic
Shift the mission 3 to the target stage. By the way, the above d
Operation control of exhaust brake 9, semi-automatic transmission
And the electronic governor 1A is controlled.
Auto cruise is controlled by any of the
The brake pedal, etc.
Even if the cruise control is not released by
In order to be able to slow down
Just perform a gear change operation and run at a constant speed with the release means 107
Row control is released. Specifically, step S80, step S80
130, step S140, step S145, step
Steps S160, S180, and S190
The processing proceeds to step S90 after the
Change lever unit 4 is in N position, R position
Or + position or-position
Is determined. As a result of this determination, at any position
In some cases, constant speed traveling control by the constant speed traveling control means 101
Cancel. On the other hand, if you are not in any position
(That is, when it is the D position or the H position)
Returns to step S10, and as described above,
S10 to step S80, step S100 to step
Actuation of the exhaust brake 9 by the processing of S190
Control, shift control of the gear stage of semi-automatic transmission 3
Constant speed control by fuel supply control of the control and electronic governor 1A
Continue your control. In this constant speed traveling device for a vehicle, as described above,
The cruise control is performed in this way.
The vehicle speed is controlled by the shift-down control means 105 as the indicating means.
Greater than the driving force of the current gear to maintain
When a large driving force is required,
The point is that the number of downshift stages is set accordingly. others
Therefore, the downshift control means 105
Comprising means 105A and stage number setting means 105B
Is done. Then, the shift down determination means 105A
From the above, it is determined whether or not the following conditions are satisfied.
Need to shift down when the condition of
Is determined. The actual vehicle speed detected by the vehicle speed sensor 21
From the target vehicle speed set by the loose set switch 5
It is equal to or less than a value obtained by subtracting the predetermined vehicle speed CRD [actual vehicle speed ≦ target vehicle
Speed-predetermined vehicle speed CRD]. Electronic governor control unit 12
Set as a control amount of the electronic governor 1A by the
When the position voltage is equal to or lower than the specified voltage CRRD,
At least a predetermined value [Rack position voltage ≦ Specified voltage CRR
D]. In addition, the deceleration calculated by the deceleration calculating means 102
According to the magnitude of the speed, the stage number setting means 105B sets
It is designed to set the number of shift down steps, for example,
When traveling on steep uphill roads or when the load capacity is large,
Even if the deceleration is large, ensure the required driving force
To ensure that the target vehicle speed for constant speed driving is maintained more reliably.
And can be done. For this reason, the stage number setting means 105B
Judge whether or not the condition is satisfied.
If so, set the number of downshifts to 2
It has become. A large deceleration calculated by the deceleration calculating means 102;
The magnitude is equal to or smaller than the predetermined deceleration (first predetermined deceleration) αd2
[| Deceleration | ≧ | predetermined deceleration αd2 |]. If this condition is not satisfied,
The setting unit 105B further satisfies the following conditions.
Is determined, and if this condition is satisfied, shift
The number of stages of down-down is set to one. A large deceleration calculated by the deceleration calculating means 102;
The magnitude is equal to or smaller than the predetermined deceleration (second predetermined deceleration) αd1
[| Deceleration | ≧ | predetermined deceleration αd1 |]. Accordingly, the constant-speed traveling device for a vehicle according to the present invention.
According to the above, the actual vehicle speed is equal to or lower than the target vehicle speed, and the deceleration is
The magnitude of the vehicle deceleration detected by the detection means 102
Is greater than or equal to the predetermined deceleration αd2, the shift
The number of shift down steps is set to two steps by the down control means 105.
By instructing as above, for example, running on a steep uphill road
Or when the deceleration is large when the load capacity is large.
Even if this is the case, maintain the target
There is an advantage that can be. In particular, changes such as trucks
For vehicles with a large number of gears, it would take two
In some cases, a downshift is more effective.
You. Further, the speed is detected by the deceleration detecting means 102.
The magnitude of the deceleration is less than or equal to the predetermined deceleration αd1
And a predetermined deceleration smaller than the magnitude of the predetermined deceleration αd2.
When the speed is higher than the speed αd1, the semi-automatic
Reduce the number of downshifting stages for mission 3 to 1 and decelerate
Depending on the magnitude of the deceleration detected by the
The shift designated by the shift-down control means 105
By changing the number of steps of
Can prevent downshifting more than necessary
The advantage is that The speed is reduced by the stage number setting means 105B.
The number of downshifts is set according to the degree
The optimal downshift to return to the target vehicle speed
There is the advantage that the number can be set. The book
According to the vehicle constant speed traveling device of the embodiment, the auxiliary brake
Is an exhaust brake, but is not limited to this
Not an open-compression engine auxiliary brake or Rita
Or the like. In the vehicle constant speed traveling apparatus of the present embodiment,
Is a shift-up control by the shift-up control means 104.
The downshift control by the downshift control means 105
Control, current stage holding control by current stage holding control means 106, release
Release control of constant-speed running control by means 107, exhaust
Exhaust brake by the brake control means 108
By performing all the control of the operation control, the vehicle travels at a constant speed.
The shift-down control means 105
Shift down control only by
Shift up control by the up control means 104
Current stage holding control by holding control means 106, canceling means 107
Release of constant-speed cruise control, exhaust brake
Exhaust brake operation control by the control means 108
It may not be performed. Further, in the vehicle constant-speed traveling device of the present embodiment,
Is the magnitude of the deceleration of the vehicle by the step number setting means 105B.
Is greater than or equal to the first predetermined deceleration or the second predetermined deceleration
Shift by determining if the speed is greater than
The number of down steps is set as 1 or 2 steps.
However, the present invention is not limited to this.
May be set to two or more stages.
No. Also, shift down according to the magnitude of vehicle deceleration.
May be set. Furthermore, the constant-speed traveling device for a vehicle according to the present embodiment.
The transmission to which the gearbox is applied is a semi-automatic
Not limited to missions
It can be applied to automatic transmissions. [0087] As described in detail above, the book according to claim 1 is described.
According to the vehicle constant speed traveling device of the invention,Improve fuel economy
And traveling on steep uphill roads, for example.
When the deceleration is large, such as when
Even more reliably, maintain the target vehicle speed for constant speed driving
When the deceleration is small, shift more than necessary
There is an advantage that downdown can be prevented. [0088] [0089]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram schematically showing a main configuration of a control system of a constant-speed traveling device for a vehicle according to an embodiment of the present invention. FIG. 2 is a block diagram schematically illustrating an entire configuration of a constant-speed traveling device for a vehicle according to an embodiment of the present invention. FIG. 3 is a block diagram schematically illustrating a configuration of a main part of a vehicle load degree calculating unit of the vehicle constant-speed traveling device according to the embodiment of the present invention. FIG. 4 is a schematic diagram illustrating a control configuration of a constant-speed traveling device for a vehicle according to an embodiment of the present invention. FIG. 5 is a flowchart for explaining the operation of the vehicle constant-speed traveling device according to one embodiment of the present invention. [Description of Signs] 1A Electronic governor 2 Clutch mechanism 2A Clutch booster 3 Semi-automatic transmission 3A Gear shift unit (GSU) 4 Change lever unit as shift operation means 5 Auto cruise set switch (target vehicle speed setting means) 9 Exhaust as auxiliary brake Brake 9A Exhaust brake unit (auxiliary brake actuating means) 11 Semi-automatic T / M control unit (shift control means) 12 Electronic governor control unit 21 Vehicle speed sensor (actual vehicle speed detecting means) 27 Exhaust brake switch (auxiliary brake switch) 100 For vehicles Constant speed traveling device 101 constant speed traveling control means 102 deceleration calculation means 103 vehicle load degree calculation means 104 shift up control means 105 shift down control means (instruction means) 10 A downshift determining means 105B number setting means 106 current stage holding control means 107 release means 108 Exhaust brake control unit (auxiliary brake control means) 115 various sensors, switches

Continuation of the front page (56) References JP-A-63-203950 (JP, A) JP-A-6-344802 (JP, A) JP-A-61-228152 (JP, A) JP-A-1-190549 (JP) JP-A-61-235224 (JP, A) JP-A-3-61427 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) F16H 59/00-63/48

Claims (1)

(57) [Claims] [Claim 1] Target vehicle speed setting means for setting a target vehicle speed for constant speed traveling, actual vehicle speed detecting means for detecting an actual vehicle speed of the vehicle, and detecting deceleration of the vehicle Deceleration detecting means, the actual vehicle speed detected by the actual vehicle speed detecting means during constant speed traveling is equal to or less than a value obtained by subtracting a predetermined vehicle speed from the target vehicle speed detected by the target vehicle speed detecting means , and ,fuel
The injection amount is equal to or more than a predetermined value, and the deceleration detecting means
Is greater than the first predetermined deceleration.
When the speed is greater than or equal to
While indicating the speed position as the target speed, the actual vehicle speed detection means
The actual vehicle speed detected from the target vehicle speed setting means
A value obtained by subtracting a predetermined vehicle speed from the target vehicle speed set by
And the fuel injection amount is equal to or more than a predetermined value, and
And the magnitude of the deceleration detected by the deceleration detecting means.
Is less than or equal to the magnitude of the first predetermined deceleration, and
The magnitude of the second predetermined deceleration smaller than the magnitude of the first predetermined deceleration
When the speed is equal to or greater than the current gear, the gear is one less than the current gear
Means for instructing the vehicle as a target gear, a shift control means for changing the gear position of the automatic transmission based on an instruction from the instruction means , and determining that the speed is not less than a value obtained by subtracting the predetermined vehicle speed from the target vehicle speed.
When a constant speed running control by fuel supply control is performed
A constant-speed traveling device for a vehicle, comprising: high- speed traveling control means .