JP2000045834A - Engine speed control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To avoid an excessive rate of the quantity of the idle air by correcting a basic controlled variable of the opening of an idle control valve, which is corrected for increase on basis of the various corrected amounts at the time of running of a vehicle from a condition that a load is applied, for reduction on the basis of the car speed corrected amount set in response to the car speed. SOLUTION: When a program is started at the time of running of a vehicle from a condition that an automatic transmission is shifted to a drive range D (S100), a determination whether the automatic transmission is shifted in the drive range D or a neutral range N is performed (S102). In the case of the drive range D, basic controlled variable Sd for the drive range D is set (S104), and control is performed so that the basic controlled variable Sd for the drive range D is corrected for reduction on the basis of the car speed corrected amount Cv set in response to the car speed V of the vehicle (S106), and the opening of the idle control valve is held at the basic controlled variable Sd after the correction for reduction. On the other hand, in the case of the neutral range N, basic controlled variable Sn for the neutral range is set (S110).

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine speed control apparatus, and more particularly, to a vehicle speed control in a low vehicle speed range, and a large deceleration when a throttle valve is fully closed during running. The present invention relates to an engine speed control device capable of facilitating vehicle speed control during deceleration, suppressing engine speed during inertial deceleration running, and improving fuel efficiency.

[0002]

2. Description of the Related Art Some engines mounted on vehicles are provided with an engine speed control device for controlling the engine speed during idling operation. The engine speed control device includes an idle air passage that bypasses a throttle valve in an intake passage of the engine, an idle control valve that adjusts an idle air amount of the idle air passage, and controls the engine speed by controlling the idle control valve. You control the number.

In this engine speed control device, various correction amounts are set and provided as correction amounts when a load related to the vehicle and the engine is applied, and when the vehicle is stopped and the throttle valve is set to a full idle opening degree. When the load is applied when the engine is closed, the idle reference amount is increased by various correction amounts, and the opening of the idle control valve is feedback-controlled so that the engine speed becomes the target speed. In addition, the engine speed control device stops the feedback control when the vehicle is running after the load is applied, and opens the idle control valve that has been increased by various correction amounts when the feedback control is stopped. The degree is set as a basic control amount, and control is performed such that the opening degree of the idle control valve is maintained at the basic control amount.

For example, an engine speed control device for controlling the speed of an engine to which an automatic transmission is connected includes a drive range idle-up correction amount as a correction amount when the automatic transmission is shifted to a drive range. Some are set.

When the automatic transmission is shifted to the drive range when the vehicle is stopped and the throttle valve is fully closed, the engine speed control device increases the engine speed by using the drive range idle-up correction amount to increase the engine speed. The feedback control of the opening degree of the idle control valve is performed so that the target rotation speed becomes the target rotation speed. Further, the engine speed control device stops the feedback control during traveling of the vehicle from the case where the automatic transmission is shifted to the drive range,
The opening of the idle control valve, which is increased by the drive range idle-up correction amount when the feedback control is stopped, is set as the basic control amount, and the basic control amount is controlled to maintain the opening of the idle control valve.

[0006] An example of such an engine speed control device is disclosed in Japanese Patent Application Laid-Open No. Hei 5-195832. This publication discloses that the transmission is N, P
After a lapse of a set time after shifting from the range to the travel range, the AT vehicle travel range correction value is increased by a small amount until the set value is obtained in each calculation cycle. The temporary engine speed immediately after shifting the transmission from the N and P ranges to the travel range by correcting the basic characteristic value set based on the setting and setting the opening of the ISC valve interposed in the air bypass passage. It is intended to prevent the rise.

[0007]

By the way, in an engine speed control device for controlling the speed of an engine to which an automatic transmission is connected, for example, as described above, the automatic transmission is driven as a load correction amount. In some cases, a drive range idle-up correction amount is set and provided when shifting to a range.

When the automatic transmission is shifted to the drive range when the vehicle is stopped and the throttle valve is fully closed, the engine speed control device increases the idle reference amount by the drive range idle-up correction amount. Then, the opening of the idle control valve is feedback-controlled so that the engine speed becomes the target speed.

With this, the engine speed control apparatus increases the opening of the idle control valve and increases the intake air amount of the engine when the automatic transmission is shifted to the drive range when the vehicle stops. This compensates for the increase in engine load due to shifting to the drive range.

This engine speed control device stops the feedback control when the vehicle starts running from a stopped state in which the drive range idle-up correction amount is increased and the opening degree of the idle control valve is feedback-controlled. The control is performed such that the opening of the idle control valve is maintained at the basic control amount when the feedback control is stopped.

However, the opening degree of the idle control valve during traveling is largely open because the opening degree of the idle control valve, which is increased by the drive range idle-up correction amount before the start of traveling, is used as the basic control amount. The idle air amount has been increased.

Therefore, in a low vehicle speed range where the throttle opening is small, as shown in FIG. 10, the amount of idle air by the idle control valve is larger than the amount of intake air by the throttle valve, and vehicle speed control is not performed. There are inconveniences that are difficult.

When the throttle valve is fully closed to the idling opening during running, the ratio of the idle air amount to the intake air amount by the throttle valve is large, so that the deceleration is small as shown in FIG. As a result, there is a disadvantage that the feeling of idling is increased, and it is difficult to control the vehicle speed during deceleration.

Further, when the automatic transmission connected to the engine that cuts fuel during deceleration operation does not have a lock-up clutch, as shown in FIG. When the engine speed reaches the engine speed, the vehicle returns from the fuel cut. However, if the opening of the idle control valve during running is large as described above, the engine speed increases due to the large amount of idle air, and coasting deceleration (coasting) is performed. The engine speed at the time of (down) cannot be suppressed, and there is a disadvantage that fuel efficiency is deteriorated.

[0015]

SUMMARY OF THE INVENTION In order to eliminate the above-mentioned disadvantages, the present invention provides an idle air passage which bypasses a throttle valve in an intake passage of an engine mounted on a vehicle. An idle control valve for adjusting the air amount is provided, and various correction amounts are set and provided as correction amounts when a load related to the vehicle and the engine is applied, and when the vehicle stops and the throttle valve is fully closed. When the load is applied, the opening degree of the idle control valve is feedback-controlled so that the engine speed becomes the target speed by increasing the amount of correction by various correction amounts, and the load from the case where the load is applied. When the feedback control is stopped during running of the vehicle, the opening degree of the idle control valve, which is increased and corrected by the various correction amounts, is set to a basic control amount. In the engine speed control device for controlling the basic control amount to maintain the opening of the idle control valve, the increase correction is performed by the various correction amounts during traveling of the vehicle after the load is applied. A control means is provided for controlling the basic control amount of the opening degree of the idle control valve to be reduced by a vehicle speed correction amount set according to the vehicle speed of the vehicle.

An idle air passage bypassing a throttle valve is provided in an intake passage of an engine mounted on the vehicle, and an idle control valve for adjusting an amount of idle air in the idle air passage is provided. And a drive range idle-up correction amount is set and provided as a correction amount when the automatic transmission is shifted to the drive range, and the automatic transmission is set when the vehicle stops and the throttle valve is fully closed. When the engine is shifted to the drive range, the opening of the idle control valve is feedback-controlled so that the engine speed reaches the target speed by performing an increase correction by the drive range idle-up correction amount, and the automatic transmission When the vehicle is traveling from the case where the The engine rotation is controlled such that the opening of the idle control valve, which is increased by the drive range idle-up correction amount when the torque control is stopped, is used as a basic control amount to maintain the opening of the idle control valve at this basic control amount. In the number control device, the basic control amount of the opening degree of the idle control valve, which is increased and corrected by the drive range idle-up correction amount during traveling of the vehicle after the automatic transmission is shifted to the drive range, is A control means for controlling the amount of reduction by a vehicle speed correction amount set in accordance with the vehicle speed of the vehicle is provided, wherein the control means controls the opening degree of the idle control valve when feedback control is stopped. The basic control for the neutral range when the automatic transmission is shifted to the neutral range. And a drive range basic control amount when the drive range is shifted to the drive range. The control means controls the opening degree of the idle control valve by increasing the drive range idle-up correction amount. The control means controls the amount to be reduced by an acceleration correction amount set in accordance with the acceleration of the vehicle.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An engine speed control apparatus according to the present invention is characterized in that the control means controls the opening degree of an idle control valve which is increased by various correction amounts when the vehicle is running after a load is applied. The control amount is controlled so as to be reduced by the vehicle speed correction amount set in accordance with the vehicle speed of the vehicle, so that the opening of the idle control valve can be appropriately controlled in accordance with the vehicle speed. The disadvantage that the ratio of the idle air amount by the idle control valve to the amount becomes too large can be avoided.

For example, when the drive range idle-up correction amount is set and provided as a correction amount when the automatic transmission connected to the engine is shifted to the drive range, the automatic transmission is controlled by the control means. The basic control amount of the opening of the idle control valve, which is increased by the drive range idle-up correction amount when the vehicle is running after being shifted to the range, is reduced by the vehicle speed correction amount set in accordance with the vehicle speed. Control, the opening of the idle control valve can be appropriately controlled to be small according to the vehicle speed, and the ratio of the idle air amount by the idle control valve to the intake air amount by the throttle valve during traveling becomes too large. Inconvenience can be avoided. A basic control amount for the neutral range and a basic control amount for the drive range are set and provided as basic control amounts for the opening degree of the idle control valve, and the basic control amount is reduced by an acceleration correction amount according to the vehicle acceleration. Can be corrected.

[0019]

An embodiment of the present invention will be described below with reference to the drawings. 1 to 9 show an embodiment of the present invention. In FIG. 9, reference numeral 2 denotes an engine mounted on a vehicle (not shown), and reference numeral 4 denotes an automatic transmission connected to the engine 2. The engine 2 has an intake passage 6 and an exhaust passage 8, and a throttle valve 10 is provided in the intake passage 6. The automatic transmission 4 is shifted to, for example, a parking range P, a reverse range R, a neutral range N, a drive range D, a second speed range 2, and a low range L by a selection device (not shown).

An engine speed controller 12 for controlling the speed of the engine 2 includes a throttle valve 1 in the intake passage 6.
An idle air passage 14 that bypasses 0 is provided, and an idle control valve (ISCV) 16 that opens and closes the idle air passage 14 to adjust the amount of idle air is provided. The idle control valve 16 is connected to the control means 18.

The control means 18 includes an engine speed sensor 20 for detecting the engine speed Ne, a throttle valve 10
, A vehicle speed sensor 24 for detecting a vehicle speed V of a vehicle (not shown) equipped with the engine 2, a shift position switch 26 for detecting a shift position of the automatic transmission 4, A water temperature sensor 28 for detecting a cooling water temperature, an intake air temperature sensor 30 for detecting an intake air temperature of the intake passage 6, and the like are connected and provided.

The engine speed control device 12 sets and provides various correction amounts as correction amounts when a load related to the vehicle and the engine 2 is applied. When the load is applied when the idle opening is fully closed, the idle control valve 16 is adjusted to increase the engine idle speed Ne to the target engine speed Nt by increasing the idle reference amount by various correction amounts.
And the feedback control of the opening degree θi of the idle control valve 16 when the load is applied, the feedback control is stopped when the vehicle is running, and the idle control valve 16 is increased in amount by the various correction amounts when the feedback control is stopped. Is set as the basic control amount S, and the control is performed such that the opening degree θi of the idle control valve 16 is held at the basic control amount S.

The control means 18 of the engine speed control device 12 is provided with a vehicle speed correction amount Cv corresponding to the vehicle speed V of the vehicle as shown in FIG. The vehicle speed V and the vehicle speed correction amount Cv are provided in the control means 18 as a vehicle speed correction table 32, as shown in FIG.

As shown in FIG. 6, the control means 18 controls the basic control amount S of the opening degree of the idle control valve 16 which has been increased by various correction amounts when the vehicle is running after the load is applied. Vehicle speed correction amount C set according to vehicle speed V
The control is performed so as to maintain the opening θi of the idle control valve 16 in the corrected basic control amount S. In addition, besides the vehicle speed correction amount Cv, a basic control amount S is obtained by correcting with various correction amounts as necessary, and the basic control amount S is controlled so as to hold the opening degree θi of the idle control valve 16. Can also.

The engine speed control device 12 of this embodiment
Is provided with an automatic transmission 4 connected to the engine 2.
A drive range idle-up correction amount Cd is set in the control means 18 as a correction amount when the automatic transmission 4 is shifted to the drive range D.

Thus, when the automatic transmission 4 is shifted to the drive range D by the control means 18 when the vehicle is stopped and the throttle valve 10 is fully closed, the engine speed control device 12 The amount is increased by the drive range idle-up correction amount Cd, and the opening degree θi of the idle control valve 16 is feedback-controlled so that the engine speed Ne becomes the target speed Nt.

The engine speed control device 12
Means that the control means 18 stops the feedback control when the vehicle is running after the automatic transmission 4 is shifted to the drive range D, and the drive range idle-up correction amount Cd when the feedback control is stopped.
The opening degree θi of the idle control valve 16 that has been increased by the above is set as the basic control amount S, and the basic control amount S is controlled to be maintained at the opening degree θi of the idle control valve 16.

The engine speed control device 12 of this embodiment
The control means 18 is provided with a vehicle speed correction amount Cv corresponding to the vehicle speed V of the vehicle as shown in FIG. The vehicle speed V and the vehicle speed correction amount Cv are provided in the control means 18 as a vehicle speed correction table 32, as shown in FIG.

As shown in FIGS. 1 and 2, the control means 18
When the vehicle is running after the automatic transmission 4 is shifted to the drive range D, the basic control amount S of the opening degree θi of the idle control valve 16 that has been increased by the drive range idle-up correction amount Cd is determined by the vehicle speed. The vehicle is controlled so as to perform the reduction correction by the vehicle speed correction amount Cv set according to V.

In this embodiment, the opening θi of the idle control valve 16 when the feedback control is stopped
, The basic control amount Sn for the neutral range when the automatic transmission 4 is shifted to the neutral range N, and the drive range D
The basic control amount Sd for the drive range in the case where the shift is performed is set and provided. The control means 18 controls the basic control amount S for the drive range when the vehicle is running after the automatic transmission 4 is shifted to the drive range D.
d is controlled to be reduced by a vehicle speed correction amount Cv set according to the vehicle speed V of the vehicle.

Next, the operation of this embodiment will be described.

The engine speed control device 12 is controlled by the control means 18 when the vehicle is stopped and the throttle valve 10 is stopped.
When the automatic transmission 4 is shifted to the drive range D when the idle opening is fully closed, the idle reference amount is increased by the drive range idle-up correction amount Cd to increase the engine speed Ne to the target engine speed Nt. The opening degree θi of the idle control valve 16 is feedback-controlled so as to be as follows.

The engine speed control device 12
Means that the control means 18 stops the feedback control when the vehicle is running after the automatic transmission 4 is shifted to the drive range D, and the drive range idle-up correction amount Cd when the feedback control is stopped.
The opening degree θi of the idle control valve 16, which has been increased by the above, is defined as the basic control amount S, and the basic control amount S is
Control is performed so as to maintain the opening degree θi of 6.

At this time, the engine speed control device 12
Controls the basic control amount S of the opening degree θi of the idle control valve 16, which has been increased and corrected by the drive range idle-up correction amount Cd, to be reduced by the vehicle speed correction amount Cv set according to the vehicle speed V of the vehicle.

In this embodiment, the opening θi of the idle control valve 10 when the feedback control is stopped
The basic control amount Sn for the neutral range and the basic control amount Sd for the drive range are set and provided as the basic control amount S, and the vehicle from the case where the automatic transmission 4 is shifted to the drive range D is provided. When the vehicle is traveling, control is performed so that the basic control amount Sd for the drive range is reduced by the vehicle speed correction amount Cv set according to the vehicle speed V of the vehicle.

As shown in FIG. 1, the engine speed control device 12 starts the program by the control means 18 when the vehicle is running after the automatic transmission 4 is shifted to the drive range D (step 100). Then
It is determined whether the automatic transmission 4 is in the drive range D or the neutral range N (step 102).

In this determination (step 102), if the automatic transmission 4 has been shifted to the drive range D, a basic control amount Sd for the drive range is set (step 104), and the basic control for the drive range is performed. Quantity Sd
Is controlled by the vehicle speed correction amount Cv set in accordance with the vehicle speed V of the vehicle (step 106), and the basic control amount Sd after the reduction correction is added to the opening θ of the idle control valve 16.
i is held and set to end (step 108).

On the other hand, when the automatic transmission 4 is shifted to the neutral range N in the above judgment (step 102), the basic control amount Sn for the neutral range is used.
Is set (step 110), and the process ends (step 108).

That is, when the vehicle is stopped and the throttle valve 1
When the automatic transmission 4 is shifted to the drive range D at the time of the fully closed state of 0, the idle control valve 16 is adjusted so that the engine speed Ne becomes the target speed Nt by increasing the amount by the drive range idle-up correction amount Cd. Is feedback-controlled.

As described above, the automatic transmission 4 is shifted to the drive range D, and the idle control valve 16 is opened so that the engine speed Ne becomes the target speed Nt by increasing the drive range by the drive range idle-up correction amount Cd. Degree θi
When the vehicle is started from a stopped state in which the feedback control is performed, the feedback control is stopped, and the opening degree θi of the idle control valve 16 when the feedback control is stopped is set as the basic control amount Sd. Quantity Sd
Holds the opening degree θi of the idle control valve 16.

At this time, the engine speed control device 12
The basic control amount Sd of the opening degree θi of the idle control valve 16, which is increased and corrected by the drive range idle-up correction amount Cd, is calculated based on the vehicle speed correction amount Cv set according to the vehicle speed V of the vehicle shown in FIGS. As shown in FIG. 2, control is performed so as to correct the weight loss. When the vehicle speed V becomes equal to or higher than the vehicle speed Vo after the start of traveling, the engine speed control device 12 reduces the basic control amount SdK by the vehicle speed correction amount Cv by the drive range idle-up correction amount Cd, and the vehicle speed V becomes the set vehicle speed Vs. When it reaches, the drive range idle-up correction amount Cd is set to zero.

Thus, the engine speed control device 12 holds the opening degree θi of the idle control valve 16 at the basic control amount Sd gradually reduced by the vehicle speed correction amount Cv as the vehicle speed V increases. The opening degree θi of the idle control valve 16 can be appropriately controlled to be small according to the vehicle speed V, and when traveling in a low vehicle speed range in which the vehicle speed V is reduced after the basic control amount Sd is reduced by the increase in the vehicle speed V, By reducing the basic control amount Sd, it is possible to avoid a problem that the ratio of the idle air amount by the idle control valve 16 to the intake air amount by the throttle valve 8 becomes too large.

Therefore, the engine speed control device 1
2 can avoid the inconvenience that the amount of idle air becomes too large with respect to the amount of air taken in by the throttle valve 10 in a low vehicle speed range in which the throttle opening 10 is small during running as shown in FIG. , Can facilitate vehicle speed control.

Further, when the throttle valve 10 is fully closed to the idling opening during running, the ratio of the idle air amount to the intake air amount by the throttle valve 10 does not increase, and FIG. As described above, the deceleration can be increased, and vehicle speed control during deceleration can be facilitated.

Further, in the case where the automatic transmission 4 connected to the engine 2 that cuts off the fuel during deceleration operation does not have a lock-up clutch, the engine speed drops rapidly during deceleration, and the When the vehicle returns from the fuel cut due to reaching, the idle air amount by the idle control valve 16 during traveling can be reduced, so that the engine speed during inertial deceleration traveling can be suppressed as shown in FIG. Fuel efficiency can be improved.

In this embodiment, when the vehicle is running after the automatic transmission 4 is shifted to the drive range D, the drive range idle-up correction amount C
The basic control amount S of the opening degree θi of the idle control valve 16 that has been increased by d is controlled to be reduced by a vehicle speed correction amount Cv set in accordance with the vehicle speed V of the vehicle, as shown by a dashed line in FIG. Alternatively, the vehicle speed correction amount Cv can be set so that the drive range idle-up correction amount Cd becomes zero immediately after the vehicle starts running and the vehicle speed V becomes equal to or higher than the vehicle speed Vo.

[0047]

As described above, the engine speed control apparatus of the present invention can appropriately control the opening of the idle control valve in accordance with the vehicle speed, and can control the idle air amount by the throttle valve during traveling. The disadvantage that the ratio of the idle air amount due to the valve becomes too large can be avoided.

For this reason, in this engine speed control device, in a low vehicle speed range where the throttle opening is small during traveling, the idle air amount by the idle control valve becomes larger than the intake air amount by the throttle valve. Too much inconvenience can be avoided and vehicle speed control can be facilitated.

Further, when the throttle valve is fully closed to the idling opening degree during running, the deceleration can be increased without increasing the ratio of the idle air amount to the intake air amount by the throttle valve. Thus, vehicle speed control during deceleration can be facilitated.

Further, when the lockup clutch is not provided in the automatic transmission connected to the engine that cuts the fuel during the deceleration operation, the engine speed drops rapidly at the time of deceleration to reach the fuel cut return rotation speed. When the vehicle returns from the cut, the amount of idle air by the idle control valve during traveling can be reduced, so that the engine speed during inertial deceleration traveling can be suppressed and fuel efficiency can be improved.

[Brief description of the drawings]

FIG. 1 is a flowchart of control of an engine speed control device showing an embodiment of the present invention.

FIG. 2 is a diagram illustrating a relationship between a vehicle speed and a basic control amount.

FIG. 3 is a diagram showing a relationship between an intake air amount and an idle air amount in a low vehicle speed range.

FIG. 4 is a diagram showing deceleration when the throttle valve is fully closed.

FIG. 5 is a diagram showing an engine speed at the time of returning from fuel cut.

FIG. 6 is a block diagram showing a basic configuration of the present invention.

FIG. 7 is a diagram showing a vehicle speed correction table.

FIG. 8 is a diagram illustrating a relationship between a vehicle speed and a vehicle speed correction amount.

FIG. 9 is a block diagram of an engine speed control device.

FIG. 10 is a diagram showing a relationship between an intake air amount and an idle air amount in a low vehicle speed range showing a conventional example.

FIG. 11 is a diagram showing a deceleration when a throttle valve is fully closed, showing a conventional example.

FIG. 12 is a diagram showing an engine speed at the time of return from fuel cut showing a conventional example.

[Explanation of symbols]

 2 engine 4 automatic transmission 6 intake passage 8 exhaust passage 10 throttle valve 12 engine speed control device 14 bypass passage 16 idle control valve 18 control means 20 engine speed sensor 22 throttle sensor 24 vehicle speed sensor 26 shift position switch 28 water temperature sensor 30 Intake air temperature sensor

Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat II (Reference) F02D 29/02 331 F02D 29/02 331A 41/08 315 41/08/08 315 45/00 322 45/00 322B F term (reference) ) 3D041 AA21 AA33 AA37 AB01 AC01 AC15 AD02 AD04 AD07 AD14 AD31 AD32 AE05 AF01 AF09 3G065 AA04 AA11 CA00 DA04 EA03 EA04 EA05 EA13 FA01 FA12 GA00 GA09 GA10 GA11 GA31 GA41 GA43 KA36 3G084 BA03 BA06 EB03 CA08 FA06 FA10 FA18 FA20 FA33 3G093 AA05 BA14 BA19 CA04 CA08 CB02 CB06 CB07 CB08 DA01 DA04 DA05 DA06 DB05 DB11 DB12 EA07 EC01 FA06 FA07 FB01 FB02 3G301 JA02 KA07 KA10 KA12 KA16 KA28 KB04 KB10 LA10 MA02 MA25 NC25 PE01A PE01Z PE08Z PF01Z PF08Z PF10Z

Claims (4)

[Claims] An idle air passage bypassing a throttle valve is provided in an intake passage of an engine mounted on a vehicle, and an idle control valve for adjusting an amount of idle air in the idle air passage is provided, and a load related to the vehicle and the engine is provided. Various correction amounts are set and provided as correction amounts when the load is applied, and when the load is applied when the vehicle is stopped and the throttle valve is fully closed, the amount of correction is increased by the various correction amounts and the engine speed is increased. A feedback control of the opening of the idle control valve so that the number becomes the target rotational speed,
The opening degree of the idle control valve, which is increased and corrected by the various correction amounts when the feedback control is stopped when the vehicle is running after the load is applied, is used as the basic control amount and the basic control amount is changed to the idle control value. In the engine speed control device for controlling the opening of the valve to be maintained, the basics of the opening of the idle control valve, which is increased and corrected by the various correction amounts during traveling of the vehicle after the load is applied. An engine speed control device, further comprising control means for controlling a control amount to be reduced by a vehicle speed correction amount set according to a vehicle speed of the vehicle. 2. An engine mounted on a vehicle includes an idle air passage that bypasses a throttle valve in an intake passage of the engine, an idle control valve that adjusts an idle air amount of the idle air passage, and an automatic engine mounted on the vehicle. When the automatic transmission is shifted to the drive range, a drive range idle-up correction amount is set and provided as the correction amount when the automatic transmission is shifted to the drive range, and when the vehicle is stopped and the throttle valve is fully closed, When the automatic transmission is shifted to the drive range, the opening of the idle control valve is feedback-controlled so that the engine speed reaches the target speed by performing an increase correction by the drive range idle-up correction amount, and the automatic When the vehicle is running after the transmission is shifted to the drive range, the feedback An engine that controls the opening of the idle control valve, which is increased by the drive range idle-up correction amount when the torque control is stopped, to be a basic control amount and holds the opening of the idle control valve at the basic control amount. In the rotation speed control device, a basic control amount of an opening degree of the idle control valve, which is increased and corrected by the drive range idle-up correction amount during traveling of the vehicle after the automatic transmission is shifted to the drive range, 2. The engine speed control device according to claim 1, further comprising control means for performing control to reduce the amount of decrease by a vehicle speed correction amount set according to the vehicle speed of the vehicle. 3. The control device according to claim 1, wherein the control unit includes a basic control amount for the opening of the idle control valve when the feedback control is stopped, and a basic control amount for the neutral range when the automatic transmission is shifted to the neutral range. 3. A drive range basic control amount when being shifted to a drive range is set and provided.
3. The engine speed control device according to claim 1. 4. The control means decreases the basic control amount of the opening of the idle control valve, which is obtained by increasing the drive range idle-up correction amount, by an acceleration correction amount set in accordance with the acceleration of the vehicle. 3. The engine speed control device according to claim 2, wherein the control unit is a control unit that performs control.