JPH08218910A - Control device for car mounting automatic transmission - Google Patents

Abstract

PURPOSE: To ensure starting of a car mounting an automatic transmission on a low frictional coefficient road surface. CONSTITUTION: A holding mode adapted to a low frictional coefficient road surface which is set to an automatic transmission 12 is reflected on controlling on the side of an engine 11. An engine control unit 17 temporarily suppresses an output torque of the engine 11 until completion of starting, and suspends increase of an engine speed so as to warm-up. Starting is thus executed under the state of a low output torque and engine speed. Torque to be transmitted to the road surface from wheels is reduced, for preventing occurrence of slippage and stucking on the road surface of a low frictional coefficient.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine control device for a vehicle equipped with an automatic transmission. In particular, the present invention relates to engine control for ensuring a start on a road surface having a low friction coefficient such as a snow road.

[0002]

2. Description of the Related Art Since the shift stage at the start of the automatic transmission in the normal shift mode is the first speed, a vehicle equipped with the automatic transmission slips at the time of starting on a low friction coefficient road surface such as muddy, icy road surface or snowy road. Or a stack may occur. Here, the slip is a longitudinal and lateral slip of the tire with respect to the road surface, and the stack is a state in which the vehicle cannot start because the tire slips vertically and spins on the road surface. This is because the high gear ratio of the first speed of the automatic transmission transmits torque of a level that cannot be gripped on a road surface having such a low friction coefficient from the tire to the road surface. Also,
When the gear ratio is high, the engine load is small, so that the depression of the accelerator pedal rapidly raises the engine speed, causing the tire to idle.

On the other hand, in a vehicle equipped with a manual transmission, if the driver intentionally sets the second speed or the third speed and executes the start operation, the engine speed will only slowly rise even if the accelerator pedal is depressed. The level of the torque transmitted from the tires to the road surface at the time of starting also decreases, and smooth starting is possible even on such a low friction coefficient road surface. Therefore, in vehicles equipped with an automatic transmission, in addition to the normal shift mode, special shift modes such as a snow mode, a winter mode, and a hold mode are provided. In these special shift modes, the shift stage at the time of starting is set to the second speed or the third speed.

A vehicle equipped with an automatic transmission provided with a special shift mode adapted to a road surface having a low friction coefficient is disclosed in, for example, Japanese Patent Laid-Open No. 63-
No. 149453. Here, the complicated setting and releasing operation in the conventional snow mode setting is solved, and when the running speed reaches a certain value after starting the second speed in the snow mode, the snow mode is released and the normal operation is automatically performed. Returning to mode.

[0005]

When the engine speed input to the automatic transmission is high, the automatic transmission is engaged at the time of starting even if the snow mode is set and the vehicle is started in the second speed or the third speed. There is a possibility that the tire will slip the moment you hit. In a situation where the snow mode is set, the driver himself / herself carefully performs the starting operation, and therefore, it is unlikely that the accelerator pedal is roughly depressed and the engine speed is rapidly increased. However, in the control for increasing the idle speed, the automatic transmission is engaged in a state where the engine speed and the output torque are considerably high. The control for increasing the idle speed automatically increases the idle speed of the engine for the purpose of preventing engine stalling due to warm air after the engine is started or air conditioner load. The increase of the rotation speed is accompanied by the increase of the output torque. At this time, the level of the torque transmitted from the tire to the road surface at the time of starting suddenly increases, and the tire may slip and slip.

That is, in order to smoothly start on a road surface having a low coefficient of friction, the gear ratio of the automatic transmission is reduced to increase the load on the engine, and the automatic transmission is engaged with the engine output torque being low. It is necessary to start driving the tires. However, the conventional snow mode only affects the control of the automatic transmission and is irrelevant to the input / output state of the engine.

Such inconvenience is more apparent in the case of a diesel engine. Diesel engine is (1)
The output torque is high in the low-speed rotation range, and (2) it is necessary to increase the idle speed to warm up until a stable temperature condition is reached, and (3) the idle speed is maintained in order to maintain a low-pollution combustion state. This is because it cannot be set too low.

The present invention eliminates the inconvenience caused by the engine output when starting on a low friction coefficient road surface, and can smoothly start the vehicle in a shift mode suitable for a low friction coefficient road surface. The purpose is to provide a control device.

[0009]

According to a first aspect of the present invention, in an "engine control device for a vehicle equipped with an automatic transmission" capable of adjusting an engine output torque by changing an operating state of an engine, a second speed or more when starting. A mode setting means capable of setting a shift mode using the shift speed of the automatic transmission to the automatic transmission, a start detecting means for outputting a signal capable of identifying the start time, and a speed detecting means for outputting a signal capable of identifying the traveling speed. In the situation where the mode setting means is set to the shift mode, the engine output torque at start is suppressed by changing the operating state of the engine based on the outputs of the start detecting means and the speed detecting means, and the vehicle is driven. And a control means for stopping the suppression of the engine output torque when the speed reaches a predetermined speed.

According to a second aspect of the present invention, the control means according to the first aspect stops the suppression of the engine output torque even after the traveling speed has not reached the predetermined speed after a predetermined time has elapsed from the start.

According to a third aspect of the present invention, the control means according to the first or second aspect provides the engine output even when the accelerator pedal is stepped over a predetermined range or more, even within the predetermined time or below the predetermined speed. The torque suppression is stopped.

According to a fourth aspect of the present invention, in an "engine control device for a vehicle equipped with an automatic transmission" that executes control for automatically increasing the idle speed of the engine above a normal level, at a shift speed of two or more speeds when starting. A mode setting means capable of setting a shift mode using an automatic transmission to an automatic transmission, a start detecting means for outputting a signal capable of discriminating a start time, a speed detecting means for outputting a signal capable of discriminating a traveling speed; In a situation where the setting means is set to the speed change mode, the control is suspended based on the outputs of the start detection means and the speed detection means, thereby suppressing an increase in the idle rotation speed at the start and keeping the traveling speed at a predetermined value. And a control means for stopping the suppression of the increase of the idle speed when the speed is reached.

According to a fifth aspect of the invention, in the engine control device capable of adjusting the engine output torque by changing the operating state of the engine, the automatic transmission is set to the shift mode in which the shift speed of the second speed or higher is used at the time of starting. Possible mode setting means, a start detecting means for outputting a signal capable of identifying the start time, a speed detecting means for outputting a signal capable of identifying the traveling speed, and a situation where the mode setting means is set to the speed change mode. Then, the engine output torque at the time of starting is suppressed by changing the operating state of the engine based on the outputs of the start detecting means and the speed detecting means, and the engine output torque is suppressed when a predetermined time elapses after the starting. And a control means for stopping.

According to a sixth aspect of the present invention, in an engine control device for executing a control for automatically increasing the idle speed of the engine above a normal level, an automatic shifting is performed in a shift mode in which a shift speed of at least a second speed is used when starting. Mode setting means that can be set in the aircraft, start detection means that outputs a signal that can identify the start time, speed detection means that outputs a signal that can identify the running speed, and the mode setting means sets the shift mode In this situation, by suspending the control based on the outputs of the start detecting means and the speed detecting means, an increase in the idle speed at the start is suppressed, and the idle rotation is stopped when a predetermined time elapses after the start. And a control means for stopping the suppression of the increase in the number.

[0015]

In the engine control device for a vehicle equipped with an automatic transmission according to claim 1, in a gear shifting mode for starting on a low friction coefficient road surface such as a snow mode or a winter mode, not only the automatic transmission but also the engine is descent. Control to ensure starting. Specifically, at least one of the ignition phase angle of the engine, the fuel supply amount, the number of output cylinders, the exhaust gas recirculation ratio into the cylinder, etc. is changed to cause the engine operating state to deviate from the normal control range. Let This intentionally suppresses the output torque of the engine when the automatic transmission is engaged when starting, reduces the torque transmitted from the tires to the road surface when the automatic transmission is engaged, and reduces the engine load. Even if it is small, it does not cause a sudden increase in engine speed. The above-described method of suppressing the output torque of the engine has been conventionally adopted for the purpose of maximizing the performance and efficiency of the engine by adapting to the engine speed, output torque and running condition.
Here, conversely, by shifting the operating state of the engine from the "state in which the engine's capacity and efficiency can be maximized" and intentionally reducing the output and efficiency, "a low friction coefficient It is in a convenient state ".

The control for suppressing the output torque of the engine in the speed change mode adapted to the low friction coefficient road surface is stopped when the traveling speed reaches a predetermined speed after the completion of starting, and automatically returns to the normal engine control. To do. After the automatic transmission is engaged and the tire grips the road surface and starts to rotate normally, return the engine to normal control at the earliest possible time to adversely affect the stability of engine rotation and the acceleration performance of the vehicle. To avoid.

According to another aspect of the engine control device for a vehicle equipped with an automatic transmission of the present invention, when the predetermined speed cannot be reached due to traffic jam or the like, the control for suppressing the engine output torque is forced within a preset time limit. To stop it. Once the start of the vehicle is complete and the vehicle begins to move forward, there will be no large fluctuations in the torque transmitted from the tires to the road surface.
No slipping or stacking occurs even with normal control.

In the engine control device for a vehicle equipped with an automatic transmission according to the third aspect of the present invention, the control for suppressing the engine output torque is forcibly stopped when the driver himself / herself selects and demands strong acceleration. A large depression of the accelerator pedal in a gear shift mode adapted to a low friction coefficient road surface is an indication that the driver determines that there is no risk of slipping, such as completion of passing through the freezing range of the road, and requests strong acceleration. is there.

According to another aspect of the engine control apparatus for a vehicle equipped with an automatic transmission of the present invention, when a control for automatically increasing the idle speed of the engine from a normal level is executed, the control is stopped at the time of starting the engine. The idle speed of is returned to the normal level. As a result, when the automatic transmission is engaged, even though the driver is not depressing the accelerator pedal, the tire speed increases rapidly due to the high idle speed on the engine side, and as a result, slippage and stacking occur. The situation that causes

Here, as in the second aspect of the present invention, the suppression of the engine output torque may be stopped after the elapse of a predetermined time from the start even if the traveling speed does not reach the predetermined speed. Further, as in the third aspect of the invention, when the accelerator pedal is depressed beyond a predetermined range, the suppression of the engine output torque may be stopped even within the predetermined time.

According to a fifth aspect of the present invention, in the engine control device for a vehicle equipped with an automatic transmission, as in the first aspect of the invention, the operating condition of the engine at the time of starting is "normal condition for maximizing engine performance and efficiency. By intentionally reducing the output and efficiency, the slip and the stack are avoided. However, the operating state of the engine is returned to the normal state when a predetermined time has elapsed from the start of starting.

In the engine control device for a vehicle equipped with an automatic transmission according to a sixth aspect of the present invention, similarly to the invention of the fourth aspect, the control for automatically increasing the idle speed of the engine above the normal level is executed. At the start, this control is interrupted to return the idle speed of the engine to the normal level, thereby avoiding slippage and stacking. However, when a predetermined time elapses from the start of the start, the engine is returned to the original control for automatically increasing the idle speed of the engine from the normal level.

[0023]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Engine control in a vehicle equipped with an automatic transmission according to an embodiment will be described with reference to FIGS. The vehicle equipped with the automatic transmission of the embodiment is provided with a hold mode for starting on a road surface having a low friction coefficient. In the hold mode, the automatic transmission at the time of starting is set to the third speed and the output torque of the engine is set. Is suppressed, and the control for increasing the idle speed is also interrupted. FIG. 1 is a system configuration diagram of the embodiment, and FIG. 2 is a control flowchart.

In FIG. 1, an automatic transmission 12 is connected to a vertically mounted engine 11. The output of the automatic transmission 12 drives the rear wheels 20 of the vehicle via the differential mechanism 13. Throttle valve 11 of engine 11
A is connected to the accelerator pedal 14 by an accelerator wire 14A. The output of the engine 11 changes according to the depression amount of the accelerator pedal 14. Engine 11
The fuel supply system 11B of the engine control unit 1
Controlled by 7. The engine control unit 17 also has a FICD (Fast Idle Control Device).
Control for automatically increasing the idle speed of the engine above the normal level for the purpose of warming up or preventing engine stall (hereinafter simply referred to as "control for increasing idle speed"). Thus, the idle speed is automatically raised above the normal level for a predetermined time after the engine is started and when the air conditioner is operating.

The automatic transmission 12 can change the gear ratio between the forward 5 stages and the reverse 1 stage by switching the internal transmission mechanism. Switching of the speed change mechanism is performed by switching the oil passage of the control valve unit 12C with a solenoid valve. The solenoid valve of the control valve unit 12C is controlled by the automatic transmission control unit 18. The output of the throttle sensor provided in the throttle valve 11A is input to the automatic transmission control unit 18 to obtain the throttle opening every moment. The output of the rotation sensor 12A that detects the rotation speed of the output shaft of the automatic transmission 12 is input to the automatic transmission control unit 18, and the traveling speed is obtained. The automatic transmission control unit 18 switches the shift stage of the automatic transmission 12 according to the combination of the throttle opening and the traveling speed at that time.

The output of the brake switch 15A for detecting the depression of the brake pedal 15 is input to the automatic transmission control unit 18 to identify the depression / release of the brake pedal 15. The automatic transmission control unit 18 determines that the case where the traveling speed is 0 when the brake pedal 15 is released is the start time.

The shift mode of the automatic transmission 12 is set by the driver through a shift mode switch 16 as a mode setting means. The shift mode switch 16 is arranged at one corner of the front panel in the vehicle compartment, and indicator lamps 16A and 16B are arranged above and below a central momentary seesaw switch 16B. In the normal state, the seesaw switch 16B emits light to indicate that the automatic transmission 12 is set to the economy mode.

When the driver presses the upper portion of the seesaw switch 16B, the seesaw switch 16B is turned off, the indicator lamp 16A is turned on, and the power mode setting of the automatic transmission 12 is displayed. In this state, press the lower part of the seesaw switch 16B and the indicator lamp 1
6A goes out, the seesaw switch 16B emits light, and the automatic mode 12 return to the economy mode is displayed.

On the other hand, when the driver presses the lower portion of the seesaw switch 16B, the seesaw switch 16B is turned off, the indicator lamp 16C is turned on, and the hold mode setting of the automatic transmission 12 is displayed. In this state,
When the upper portion of the seesaw switch 16B is pressed, the indicator lamp 16C is turned off, the seesaw switch 16B is illuminated, and the return of the automatic transmission 12 to the economy mode is displayed. The automatic transmission control unit 18 controls the automatic transmission 12 according to the setting state of the shift mode switch 16.
The speed change mode is switched to the economy mode, the power mode, and the hold mode.

The economy mode is selected in the normal traveling environment and traveling state. The power mode is selected when the vehicle weight is large, large acceleration is desired, or when climbing a slope.
Engine 1 in economy mode and power mode
There is no control back to 1. Then, the shift stage of the automatic transmission at the time of starting is the first speed, and after the starting, the speed is switched to the second speed, the third speed, and the fourth speed as the traveling speed increases.

However, in the economy mode, the shift is executed at a stage where the throttle opening is relatively small, and after the fourth speed, the shift is executed to the fifth overdrive speed. As a result, the engine load is kept large over the entire range of traveling speed, and the engine speed is not increased so much, which results in good fuel economy. On the other hand, in the power mode, the gear shift is executed after the throttle opening is considerably large, so that the same gear is used up to the traveling speed higher than that in the economy mode. The fifth speed of the overdrive gear is not used. As a result, fuel consumption is slightly inferior, but strong acceleration performance can be exhibited.

The remaining hold mode is a mode selected by the driver on a low friction coefficient road surface such as muddy, frozen road surface, and snow road. In the hold mode, the first speed is not used and the automatic transmission 12 is set to the second speed from the beginning to start the vehicle.
In addition to the automatic transmission 12, the following two controls for smoothing the start of the engine 11 are executed. In the hold mode, the engine control unit 17 (1) interrupts the control for increasing the idle speed to reduce the idle speed during warm-up operation, and (2) shuts off the fuel supply to some cylinders. Reduce the output torque of the engine 11. As a result, even if the accelerator pedal 14 is depressed, the rotational speed of the engine 11 only slowly rises, and when the automatic transmission 12 is engaged, the torque transmitted from the tires of the wheels 20 to the road surface 21 becomes small, resulting in a low torque. Friction coefficient A smooth start is performed even on a road surface.

The engine control unit 17 executes the hold mode control according to the flowchart of FIG. In step 101, the shift mode switch 16
Identify whether or not is set to hold mode.
In steps 102 and 103, it is determined whether or not the vehicle is starting. Brake switch 15A is O
Only when the traveling speed is 0 km / hour at the time of changing from N to OFF, it is determined that the vehicle is starting, and the control based on the engine 11 is started. That is, when the shift mode switch 16 is set to the hold mode, the lowest shift stage of the automatic transmission 12 is the second speed, but the control related to the engine 11 is not started only by this. The control peculiar to the hold mode regarding the engine 11 is started from the moment the driver releases the brake pedal 15 while the vehicle is stopped. Step 1
At 08, the flag F is set to 1. Step 1 after starting
Although it is determined to be no in 02 and 103, as long as the flag F is 1, the process returns to step 104 in step 107,
Control of steps 111 to 113 described below is continued.

In step 104, it is determined whether or not the traveling speed is less than a preset limit value Akm / hour. When the traveling speed reaches Akm / hour, the control regarding the engine 11 ends. Akm / hour can be set to a value such as 10 km / hour, and can be changed according to the running state and driving conditions. In step 105, it is identified whether or not the depression amount of the accelerator pedal 14 is less than a preset limit value B. When the accelerator pedal 14 is stepped on B or more,
Considering that the driver has determined that it is not necessary to suppress the engine output torque, the control regarding the engine 11 is terminated, and the output torque and idle speed of the engine 11 are restored.

In step 106, the control timer value ta
Is less than a preset limit value T. Once the vehicle starts moving from a stopped state and starts moving, the torque transmitted from the tires of the wheels 20 to the road surface 21 does not change so much. Therefore, if the traveling speed does not reach Akm / hour due to traffic congestion or the like, there is no benefit to continue control of the engine 12 forever. Then, while the control for increasing the idle speed of the engine 12 is suspended, the operating state of the engine 11 is unstable, and the control for suppressing the output torque is "to maximize the ability of the engine. Since it is to intentionally set the "impossible operating state" in the engine 12, it is desirable to return to the normal state in the shortest possible time. Further, it may not be possible to detect that the vehicle speed sensor 12A has failed and reaches the speed A. Therefore, a limit value of T seconds is set. T seconds is
For example, it can be set to a value of 60 seconds or the like, and can be changed according to the running state and driving conditions.

At step 111, the count of the control timer ta is incremented. After that, in step 106, the count value of the control timer ta is identified, and when the control timer ta times out, the control ends. In step 112, the control for increasing the idle speed using the FICD is stopped. In the control for increasing the idle speed, the bypass air supply passage is opened for about 5 minutes after the engine 11 is started, and the fuel supply is slightly increased.
Increase idle speed by several tens of percent. This stabilizes the rotation until the temperature of each part of the engine 11 reaches a steady state and accelerates the warm-up. In the hold mode, the control for temporarily increasing the idle speed is stopped, and the start operation is executed in a state where the idle speed is low. At step 113, control for reducing the engine output torque is executed. Specifically, one of the fuel injection lines of a plurality of systems is stopped and some cylinders are used as a compression load.

If "no" is determined in any of steps 101, 102, 103, the engine 11
With respect to, the control peculiar to the hold mode is not started. Also, in any of steps 104, 105, and 106, "n
When it is determined "o", the engine 11 is returned to the normal control and the control peculiar to the hold mode is ended.
In step 114, the control timer ta is reset to prepare for the control at the next start. In step 115, the FI
The suspension of the control for increasing the idle speed by using the CD is released. During the warm-up period or when the air conditioner is operating,
The idle speed is immediately increased. Step 116
Then, the engine 11 is returned to the "operating state in which the engine performance can be maximized" by performing normal control. In step 109, the flag F is reset to 0, and thereafter, the control peculiar to the hold mode is not executed until the start is detected again.

In the vehicle equipped with the automatic transmission of the embodiment described above, safe hold can be started by setting the hold mode even on a low friction coefficient road surface such as a muddy road, an icy road surface or a snow road. Even under such bad conditions, no special situation judgment or operation technique is required, and there is no risk of causing slip (or stack).

Further, since the control relating to the engine 11 is executed in association with the setting on the automatic transmission 12 side using the shift mode switch 16, the driver himself / herself performs a special switch operation or setting other than the shift mode switch 16. There is no need to do. Also, regarding the termination of the control relating to the engine 11, since the three items of time, accelerator pedal depression amount, and traveling speed are automatically identified and executed, there is a risk of forgetting to release the control and continuing traveling in an inconvenient driving state. There is no. That is, the engine 11 is automatically adjusted to a state suitable for starting, and when the start is completed, the engine 11 is automatically returned to a state suitable for traveling, while the driver You don't have to be aware of any special controls.

In addition, control of the engine 11 is added by using the existing engine system as it is, except for the line for inputting the signal of the shift mode switch 16 to the engine control unit 17, and using the control program of the engine control unit 17 It will be realized with only minor changes. Therefore, there are few design changes and component additions for implementation, and the required cost is also small.

In the embodiment, the fuel supply to some of the cylinders is cut off to reduce the number of output cylinders.
Although the output of No. 1 is reduced, the following control items controlled by the engine control unit 17 can be used in addition to this. These control items may be used in combination. (1) The ignition phase angle control (retard) is originally designed to accelerate the ignition phase (ignition timing for gasoline engine, fuel injection timing for diesel engine) as the rotation speed increases, and to prevent explosion and expansion in the high rotation speed region. The timing of piston movement is optimized. Therefore, for example, by intentionally delaying the ignition phase, the output taken out to the piston from the explosion expansion is reduced. (2) If the total fuel supply amount is reduced by, for example, reducing the fuel supply to a plurality of cylinders on average, the engine output will decrease. (3) The purpose of recirculating the exhaust gas into the cylinder is to completely burn the unburned gas in the exhaust gas to purify the exhaust gas. However, if the ratio of the exhaust gas recirculation is increased, the fuel is substantially supplied. Therefore, the engine output can be reduced.

Further, although the shift mode switch is used as the mode setting means in the embodiment, it is not limited thereto. For example, the shift mode is selected by the select lever itself, or the road surface is slippery. The second speed starting mode may be automatically selected upon detection of the presence.

[0043]

According to the invention of claim 1, since the output torque of the engine is suppressed at the time of starting, it is possible to smoothly start even on a road surface having a low friction coefficient. The engine side control is set by the setting of the shift mode of the automatic transmission, and the control is automatically executed after the start is completed. Therefore, it is not necessary to set and release the engine independently. Control of the engine side is started at the same time as starting, and control of the engine side is terminated immediately after the start is completed.Therefore, it is possible to shorten the period in which the operating state of the engine deviates from the normal control range, engine condition and fuel consumption, It does not adversely affect the acceleration performance of the car. That is, it is possible to ideally execute the starting operation of the vehicle equipped with the automatic transmission without making the driver aware of the control related to the engine.

According to the second aspect of the present invention, the control on the engine side can be promptly ended after the completion of starting even when the traveling speed is still low due to traffic congestion or the like.

According to the third aspect of the invention, the control on the engine side is stopped by prioritizing the driver's judgment, so that the acceleration performance of the vehicle equipped with the automatic transmission is ensured and the driver does not feel insufficient power.

According to the fourth aspect of the present invention, since the idle speed of the engine at the time of starting is low, it is possible to smoothly start even on a road surface having a low friction coefficient. The engine side control is set by the setting of the shift mode of the automatic transmission, and the control is automatically executed after the start is completed. Therefore, it is not necessary to set and release the engine independently. Control of the engine side is started at the same time as starting, and control of the engine side is terminated immediately after the start is completed.Therefore, it is possible to shorten the period in which the operating state of the engine deviates from the normal control range, engine condition and fuel consumption, It does not adversely affect the acceleration performance of the car. That is, it is possible to ideally execute the starting operation of the vehicle equipped with the automatic transmission without making the driver aware of the control related to the engine.

According to the fifth aspect of the present invention, since the suppression of the engine output torque after the start is completed is limited to a predetermined time, the vehicle can be started reliably even on slippery road surfaces.
There is no concern that engine output torque will continue indefinitely and will adversely affect engine conditions, fuel consumption, and vehicle acceleration performance.

According to the sixth aspect of the present invention, since the suppression of the increase of the idle speed after completion of the start is limited to the predetermined time, the vehicle can be started reliably even on slippery road conditions, while the increase of the idle speed is achieved. There is no risk of adversely affecting engine conditions, automobile acceleration performance, etc.

[Brief description of drawings]

FIG. 1 is a system configuration diagram of a vehicle equipped with an automatic transmission according to an embodiment.

FIG. 2 is a flowchart of engine control in a hold mode.

[Explanation of symbols]

11 Engine 12 Automatic Transmission 13 Differential Mechanism 14 Accelerator Pedal 15 Brake Pedal 16 Shift Mode Switch 17 Engine Control Unit 18 Engine Control Unit 18 Automatic Transmission Control Unit 20 Wheels 21 Road Surface 11A Throttle Valve 11B Fuel Supply System 12A Vehicle Speed Sensor 12C Control Valve Unit 14A Accelerator Wire 15A Brake switch 16A Power mode 16B Economy mode 16C Hold mode 101, 102, 103, 104, 105, 106, 1
11, 112, 113, 115, 116 steps

─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. ⁶ Identification code Internal reference number FI Technical display area F16H 61/18 F16H 61/18 // F16H 59:18 59:44

Claims (6)

[Claims] 1. An engine control device capable of adjusting an engine output torque by changing an operating condition of an engine, and a mode setting means capable of setting a shift mode using a shift speed of 2nd gear or higher at a start to an automatic transmission. A start detection means for outputting a signal capable of identifying the start time, a speed detection means for outputting a signal capable of identifying the traveling speed, and the start detection means in a situation where the mode setting means is set to the shift mode. Control for suppressing the engine output torque at the time of starting by changing the operating state of the engine based on the outputs of the driving means and the speed detection means, and stopping the suppression of the engine output torque when the traveling speed reaches a predetermined speed. An engine control device for a vehicle equipped with an automatic transmission, comprising: 2. The automatic control system according to claim 1, wherein the control means suspends the suppression of the engine output torque after a predetermined time has elapsed from the start even if the traveling speed has not reached the predetermined speed. Engine control device for vehicles equipped with a transmission. 3. The control means suspends the suppression of the engine output torque even when the accelerator pedal is stepped over a predetermined range or more, even within the predetermined time or below the predetermined speed. Claim 1 or 2
An engine control device for a vehicle equipped with the automatic transmission described. 4. An engine control device for executing a control for automatically increasing an idle speed of an engine above a normal level, wherein a shift mode in which a shift speed of 2nd speed or higher is used when starting is set to an automatic transmission. Mode setting means, start detection means for outputting a signal capable of identifying the start time, speed detection means for outputting a signal capable of identifying the traveling speed, and in a situation where the mode setting means is set to the shift mode, By suspending the control based on the outputs of the start detection means and the speed detection means, the increase of the idle speed at the time of starting is suppressed, and the increase of the idle speed at the time when the traveling speed reaches a predetermined speed. An engine control device for a vehicle equipped with an automatic transmission, comprising: a control means for stopping the suppression. 5. An engine control device capable of adjusting an engine output torque by changing an operating state of an engine, and a mode setting means capable of setting a shift mode using a shift speed of 2nd gear or higher at a start to an automatic transmission. A start detection means for outputting a signal capable of identifying the start time, a speed detection means for outputting a signal capable of identifying the traveling speed, and the start detection means in a situation where the mode setting means is set to the shift mode. Means for controlling the engine output torque at the time of starting by changing the operating state of the engine based on the outputs of the means and the speed detecting means, and stopping the suppression of the engine output torque at the time when a predetermined time has elapsed after the starting. And an engine control device for a vehicle equipped with an automatic transmission. 6. An engine control device for executing a control for automatically increasing an idle speed of an engine above a normal level, wherein a shift mode in which a shift speed of 2nd speed or higher is used when starting is set to an automatic transmission. Mode setting means, start detection means for outputting a signal capable of identifying the start time, speed detection means for outputting a signal capable of identifying the traveling speed, and in a situation where the mode setting means is set to the shift mode, By suppressing the control based on the outputs of the start detection means and the speed detection means, an increase in the idle speed at the start is suppressed, and an increase in the idle speed is suppressed when a predetermined time has elapsed after the start. And an engine control device for a vehicle equipped with an automatic transmission.