JP2007170316A - Control device of internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To achieve the starting performance according to an operator's demand while preventing the engine stop or stacking at starting the vehicle in an MT vehicle mounted with a clutch and a manual transmission. <P>SOLUTION: Minimum starting crankshaft torque necessary for starting the vehicle is calculated based on the information of the vehicle, etc. , and required crankshaft torque is calculated according to the operator's demand (acceleration opening, etc.). When judged as vehicle starting, whichever is the greater of the required crankshaft torque and the minimum starting crankshaft torque is set as target crankshaft torque. Therefore, when the required crankshaft torque is less than the minimum starting crankshaft torque, the minimum starting crankshaft torque is set as the target crankshaft torque so as to prevent the engine stop or stacking in the vehicle starting. When the required crankshaft torque is not less than the minimum starting crankshaft torque, the required crankshaft torque is left as it is the target crankshaft torque, so as to achieve the starting performance according to the operator's demand. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a control device for an internal combustion engine applied to a vehicle that transmits an output of a crankshaft of the internal combustion engine to an axle via a power transmission system.

  Conventionally, in an MT vehicle equipped with a clutch and a manual transmission (MT), when starting a stopped vehicle, the driver depresses the clutch pedal and depresses the accelerator pedal after depressing the clutch pedal. However, the vehicle is started while the stall of the internal combustion engine (so-called engine stall) is prevented by slowly returning the clutch pedal to a half-engaged state (so-called half-clutch) in which the clutch is lightly connected. In order to smoothly perform such a series of starting operations, a certain level of skill is required and left to the skill of the driver.

  Therefore, as described in Patent Document 1 (Japanese Patent Application Laid-Open No. 2001-73842), in a system that executes torque control for controlling the internal combustion engine so as to achieve the target torque, the rotational speed of the internal combustion engine and the accelerator opening are determined. The required torque is calculated according to the degree, and when it is determined that the vehicle is in the starting state, the start assist amount is calculated according to the rotation speed and the accelerator opening of the internal combustion engine, and the required torque is smoothed. There is one that ensures a smooth start while preventing the engine stall and tackiness by adding the start assist amount to the required torque and setting the target torque.

Further, as described in Patent Document 2 (Japanese Patent Application Laid-Open No. 2001-73837), a required torque is generated when it is determined that the vehicle is in an idle start mode in which the vehicle is started only by clutch operation from an idle operation state. Some engine controls the internal combustion engine to prevent engine stall in the idle start mode.
JP 2001-73842 A (second page, etc.) JP 2001-73837 A (2nd page etc.)

  However, in the technique of the above-mentioned patent document 1, the target torque is obtained by adding the start assist amount to the smoothed required torque obtained by smoothing the required torque corresponding to the accelerator opening (that is, the driver's required torque) when starting the vehicle. Therefore, even if the driver's required torque is sufficiently large (that is, torque that can prevent engine stall and rattling), the target torque is set by adding the start assist amount to the required torque after smoothing processing. . As a result, there is a difference between the driver's required torque and the target torque, and the start acceleration performance according to the driver's request cannot be realized, which may reduce the attractiveness of the MT vehicle. .

  Further, the technique of the above-mentioned Patent Document 2 is a countermeasure against engine stall in an idle start mode in which the vehicle is started only by clutch operation from an idle operation state. It cannot be prevented.

  The present invention has been made in consideration of these circumstances, and therefore, the object of the present invention is to realize start acceleration performance according to the driver's request while preventing engine stall and backlash when starting the vehicle. An object of the present invention is to provide a control device for an internal combustion engine.

  In order to achieve the above object, an invention according to claim 1 is necessary for starting a vehicle based on vehicle information in a vehicle that transmits an output of a crankshaft of an internal combustion engine to an axle through a power transmission system. The minimum starting axle torque is calculated by the minimum starting axle torque calculating means, the minimum starting crankshaft torque is calculated by the minimum starting crankshaft torque calculating means based on the minimum starting axle torque and the shift state of the power transmission system, and Based on the driver's request, the required crankshaft torque is calculated by the required crankshaft torque calculating means. Then, based on the information on the power transmission system and the information on the vehicle, whether or not the vehicle is starting is determined by the vehicle starting time determining means, and when it is determined that the vehicle is starting, the target crankshaft torque at the time of starting is determined. The setting means sets a larger one of the minimum starting crankshaft torque and the required crankshaft torque as the target crankshaft torque at the time of starting the vehicle.

  In this configuration, when the required crankshaft torque is smaller than the minimum start crankshaft torque when starting the vehicle, the minimum start crankshaft torque required for starting the vehicle can be set as the target crankshaft torque at the start of the vehicle. In addition, by controlling the operating state of the internal combustion engine in accordance with the target crankshaft torque at the time of starting the vehicle, it is possible to prevent engine stall and shakiness at the time of starting the vehicle. On the other hand, if the required crankshaft torque is equal to or greater than the minimum starting crankshaft torque (that is, the crankshaft torque that can prevent engine stall and rattling), the required crankshaft torque according to the driver's request is used as it is as the target crankshaft when the vehicle starts It can be set as torque, and start acceleration performance according to the driver's request can be realized.

  In the first aspect of the invention, the minimum starting crankshaft torque and the required crankshaft torque are determined when it is determined that the vehicle is starting after converting the minimum starting axle torque to the minimum starting crankshaft torque. The larger one is set as the target crankshaft torque at the time of starting the vehicle. However, as in claim 2, the process of converting the minimum starting axle torque into the minimum starting crankshaft torque (minimum starting crankshaft torque calculating means) The required axle torque is calculated instead of the required crankshaft torque, and when it is determined that the vehicle is starting, the larger of the minimum starting axle torque and the required axle torque is set as the target axle at the time of starting the vehicle. The torque is set to the target, and the target axle torque at the start of the vehicle is converted into the target crankshaft torque at the start of the vehicle based on the shift state of the power transmission system. And it may be. Even if it does in this way, the effect similar to the said Claim 1 can be acquired.

  Regarding the calculation of the minimum starting axle torque, the minimum starting axle torque may be calculated based on the vehicle weight, the gravitational acceleration, and the wheel radius, as in claim 3. Generally, since the load applied to the ground contact surface of the wheel changes according to the vehicle weight and the gravitational acceleration, and the rolling resistance and the frictional force change, the vehicle weight and the gravitational acceleration can be used to overcome the rolling resistance and the frictional force. The minimum starting driving force required for starting can be calculated, and the minimum starting axle torque can be obtained by multiplying the minimum starting driving force by the wheel radius. Therefore, the minimum starting axle torque can be accurately calculated by using the vehicle weight, the acceleration of gravity, and the wheel radius.

  By the way, when starting the vehicle, it is determined that the vehicle is starting when the clutch is not yet capable of transmitting power or the manual transmission is in the neutral state, and the required crankshaft torque and the minimum starting crankshaft torque If the larger one is set as the target crankshaft torque at the start of the vehicle, the rotational speed of the internal combustion engine will blow up, which may cause discomfort to the driver.

  As a countermeasure against this, as in claim 4, the operation amount of the clutch pedal is not more than a predetermined value (that is, the clutch can transmit power), the vehicle speed is not more than the predetermined value (that is, the vehicle speed is substantially 0), and the manual transmission is It may be determined that the vehicle is starting when the operation position of the shift lever is other than the neutral position (that is, the state where the manual transmission can transmit power). In this way, when it is determined that the vehicle is starting, even if the larger one of the required crankshaft torque and the minimum starting crankshaft torque is set as the target crankshaft torque when starting the vehicle, the clutch is already engaged. And since the manual transmission is in a state where power can be transmitted, it is possible to prevent the rotational speed of the internal combustion engine from blowing up and to prevent the driver from feeling uncomfortable.

  In addition, since the wheel angle with respect to the vehicle traveling direction changes according to the steering angle and the rolling resistance changes, and the gradient resistance changes according to the road surface inclination angle, the vehicle starts depending on the steering angle and road surface inclination angle. The required axle torque changes. Therefore, as in claim 5, the minimum starting axle torque may be corrected based on the steering angle and / or the road surface inclination angle. In this way, the minimum starting axle torque can be corrected in response to changes in the axle torque required for starting the vehicle in accordance with the steering angle and the road surface inclination angle, and the calculation accuracy of the minimum starting axle torque can be increased. Can be improved.

  Hereinafter, the best mode for carrying out the present invention will be described using two Examples 1 and 2.

A first embodiment of the present invention will be described with reference to FIGS.
First, a schematic configuration of a vehicle drive system will be described with reference to FIG. A crankshaft 12 of an engine 11 that is an internal combustion engine is connected to an input shaft 15 of a manual transmission 14 via a clutch 13, and an output shaft 16 of the manual transmission 14 is connected to an axle of a wheel 19 via a differential gear 17. 18 is connected. The clutch 13, the manual transmission 14, the differential gear 17 and the like constitute a power transmission system. The output torque of the crankshaft 12 of the engine 11 is shifted by a plurality of gears of the manual transmission 14 and transmitted to the axle 18, and the wheels 19 are driven by the axle 18. The clutch 13 is engaged / disengaged by operating a clutch pedal (not shown), and the manual transmission 15 is switched in gear position by operating a shift lever (not shown).

  A crank angle sensor 20 that outputs a pulse signal every time the crankshaft 12 rotates a predetermined crank angle is attached to the engine 11, and the crank angle and the engine rotation speed are detected based on the output signal of the crank angle sensor 20. . Further, the operation amount of the clutch pedal for operating engagement / disengagement of the clutch 13 is detected by the clutch switch 21 (clutch operation amount detecting means), and the operation position of the shift lever for switching the gear position of the manual transmission 14 is shifted. It is detected by the switch 22 (shift operation position detecting means). The clutch switch 21 may be one that changes the magnitude of the output signal in accordance with the amount of operation of the clutch pedal, or is turned on / off depending on whether the amount of operation of the clutch pedal is equal to or less than a predetermined value. It may be switched.

  Further, the accelerator opening (the amount of operation of the accelerator pedal) is detected by the accelerator sensor 23, and the vehicle speed is detected by the vehicle speed sensor 24 (vehicle speed detecting means). Further, the vehicle weight sensor 25 (vehicle weight detection means) detects the vehicle weight that changes depending on the number of passengers in the vehicle, the amount of loaded luggage, the amount of fuel, and the like. For example, the vehicle weight sensor 25 detects the vehicle weight by detecting the stroke amount of the suspension device. The vehicle weight is determined based on at least one output signal of a passenger number sensor that detects the number of passengers, a load amount sensor that detects the amount of load, a fuel sensor that detects the amount of fuel in the fuel tank, and the like. You may do it.

  Outputs of these various sensors and switches are input to a control circuit (hereinafter referred to as “ECU”) 26. This ECU 26 is mainly composed of a microcomputer, and calculates various target crankshaft torques based on the accelerator opening, etc. by executing various engine control programs stored in a built-in ROM (storage medium). The fuel injection amount, intake air amount, ignition timing, etc. of the engine 11 are controlled so as to realize this target crankshaft torque.

  At that time, the ECU 26 executes a target crankshaft torque setting program shown in FIG. 2 to be described later, so that the minimum start required for starting the vehicle based on the vehicle information (for example, the vehicle weight, the gravitational acceleration, the radius of the wheel 19). The axle torque is calculated, and the minimum starting axle torque is converted into the minimum starting crankshaft torque based on the shift state (total gear ratio) of the power transmission system, and the accelerator opening (requested by the driver), the engine speed, The required crankshaft torque is calculated according to Then, it is determined whether the vehicle is starting based on information on the power transmission system (for example, the state of the clutch 13 and the manual transmission 14) and vehicle information (for example, the vehicle speed), and it is determined that the vehicle is starting. When this is done, the larger of the required crankshaft torque and the minimum start crankshaft torque is set as the target crankshaft torque at the time of vehicle start.

  As a result, when the required crankshaft torque is smaller than the minimum start crankshaft torque when the vehicle starts, the minimum start crankshaft torque required for starting the vehicle is set as the target crankshaft torque at the start of the vehicle. By controlling the operating state (for example, fuel injection amount, throttle opening, ignition timing, etc.) of the engine 11 in accordance with the target crankshaft torque at the time of starting the vehicle, engine stall and backlash at the time of starting the vehicle are prevented. On the other hand, if the required crankshaft torque is equal to or greater than the minimum starting crankshaft torque (that is, the crankshaft torque that can prevent engine stall and rattling), the required crankshaft torque according to the driver's request is used as it is as the target crankshaft when the vehicle starts Set as torque to achieve start performance according to the driver's request.

Hereinafter, the processing content of the target crankshaft torque setting program of FIG. 2 executed by the ECU 26 will be described.
The target crankshaft torque setting program shown in FIG. 2 is repeatedly executed at a predetermined cycle while the ECU 26 is powered on. When this program is started, first, in step 101, based on the current vehicle weight, gravitational acceleration, and the radius of the wheel 19, the minimum starting axle torque necessary for starting the vehicle (axle torque that can prevent engine stall and rattling) ) Is calculated by a map or a mathematical expression.

  Generally, since the load applied to the ground contact surface of the wheel 19 changes according to the vehicle weight and the gravitational acceleration, and the rolling resistance and the frictional force change, the vehicle can overcome the rolling resistance and the frictional force by using the vehicle weight and the gravitational acceleration. The minimum starting driving force required to start the vehicle can be calculated, and the minimum starting axle torque can be obtained by multiplying the minimum starting driving force by the radius of the wheel 19. Therefore, the minimum starting axle torque can be accurately calculated by using the vehicle weight, the gravitational acceleration, and the radius of the wheel 19. The processing in step 101 serves as minimum starting axle torque calculation means in the claims.

  Since the gravitational acceleration and the radius of the wheel 19 can be regarded as substantially constant, the minimum acceleration axle torque may be calculated according to only the vehicle weight by setting the gravitational acceleration and the radius of the wheel 19 to fixed values.

After calculating the minimum starting axle torque, the routine proceeds to step 102 where the minimum starting axle torque is divided by the total gear ratio that is the speed change state of the power transmission system to obtain the minimum starting crankshaft torque (e.g. Crankshaft torque) that can be prevented.
Minimum starting crankshaft torque = minimum starting axle torque ÷ total gear ratio

  Here, the total gear ratio is a ratio between the rotational speed of the crankshaft 12 and the rotational speed of the axle 18, and is calculated based on the gear ratio of the manual transmission 14 and the reduction gear ratio of the differential gear 17 when the vehicle starts. The The processing of step 102 serves as a minimum starting crankshaft torque calculating means in the claims.

  Thereafter, the process proceeds to step 103, and the required crankshaft torque corresponding to the accelerator opening (requested by the driver) and the engine speed is calculated by a map or a mathematical expression. The processing in step 103 serves as a required crankshaft torque calculation means in the claims.

Thereafter, in steps 104 to 106, it is determined whether or not the vehicle is starting, for example, depending on whether or not all the following conditions (1) to (3) are satisfied.
(1) The operation amount of the clutch pedal is not more than a predetermined value (that is, the clutch 13 can transmit power) (step 104).
Here, the state in which the clutch 13 can transmit power includes a half-engaged state (so-called half-clutch) in which the clutch 13 is lightly connected.
(2) The vehicle speed is below a predetermined value (that is, the vehicle speed is almost 0) (step 105).
(3) The operation position of the shift lever is other than the neutral position (that is, the state where the manual transmission 14 can transmit power) (step 106).

  If all of these conditions (1) to (3) are satisfied, it is determined that the vehicle is starting, but if there is a condition that does not satisfy any one of the above conditions (1) to (3), It is determined that the vehicle is not starting. The processing of these steps 104 to 106 serves as vehicle start time determination means in the claims.

If it is determined in these steps 104 to 106 that the vehicle is starting, the process proceeds to step 107, and the larger one of the required crankshaft torque and the minimum starting crankshaft torque is set as the target crankshaft torque when starting the vehicle. Set as.
That is, when the required crankshaft torque is smaller than the minimum start crankshaft torque, the minimum start crankshaft torque is set as the target crankshaft torque at the time of vehicle start.
Target crankshaft torque = minimum starting crankshaft torque

On the other hand, when the requested crankshaft torque is equal to or greater than the minimum starting crankshaft torque, the requested crankshaft torque is set as the target crankshaft torque when the vehicle starts.
Target crankshaft torque = required crankshaft torque The processing in step 107 serves as a starting target crankshaft torque setting means in the claims.

Thereafter, when it is determined in steps 104 to 106 that the vehicle is not starting, the routine proceeds to step 108 where the requested crankshaft torque is set as the target crankshaft torque as it is.
Target crankshaft torque = required crankshaft torque

  In the first embodiment described above, when it is determined that the vehicle is starting, the larger one of the required crankshaft torque and the minimum starting crankshaft torque is set as the target crankshaft torque when starting the vehicle. Therefore, when the required crankshaft torque is smaller than the minimum start crankshaft torque, the minimum start crankshaft torque required for vehicle start can be set as the target crankshaft torque at vehicle start. This can prevent the engine stalls and tackiness. On the other hand, if the required crankshaft torque is equal to or greater than the minimum starting crankshaft torque (that is, the crankshaft torque that can prevent engine stall and rattling), the required crankshaft torque according to the driver's request is used as it is as the target crankshaft when the vehicle starts It can be set as torque, and start acceleration performance according to the driver's request can be realized.

  By the way, when starting the vehicle, it is determined that the vehicle is starting when the clutch 13 cannot transmit power or the manual transmission 14 is in the neutral state, and the required crankshaft torque and the minimum start crankshaft torque are determined. If the larger of these is set as the target crankshaft torque at the start of the vehicle, the engine speed increases, which may cause discomfort to the driver.

  As a countermeasure, in the first embodiment, the operation amount of the clutch pedal is not more than a predetermined value (that is, the clutch 13 can transmit power), the vehicle speed is not more than the predetermined value (that is, the vehicle speed is almost 0), and the shift lever is operated. Since it is determined that the vehicle is starting when the position is other than the neutral position (that is, the state where the manual transmission 14 can transmit power), the required crankshaft torque is determined when it is determined that the vehicle is starting. Even if the larger of the minimum starting crankshaft torque is set as the target crankshaft torque when starting the vehicle, the clutch 13 and the manual transmission 14 are already in a state where power can be transmitted. Blowing up can be prevented and the driver can be prevented from feeling uncomfortable.

Next, Embodiment 2 of the present invention will be described with reference to FIG.
In the first embodiment, the minimum start axle torque is converted into the minimum start crankshaft torque, and when it is determined that the vehicle is starting, the larger of the required crankshaft torque and the minimum start crankshaft torque is determined as the vehicle. The target crankshaft torque is set as the target crankshaft torque at the time of starting. However, in the second embodiment, the processing for converting the minimum starting axle torque to the minimum starting crankshaft torque is omitted, and the required axle torque is substituted for the required crankshaft torque. When it is determined that the vehicle is starting, the larger of the requested axle torque and the minimum starting axle torque is selected as the target axle torque at the start of the vehicle, and the target axle torque at the start of the vehicle is used as the power. Based on the transmission state (total gear ratio) of the transmission system, it is converted into the target crankshaft torque when the vehicle starts.

  In the second embodiment, the target crankshaft torque setting program shown in FIG. 3 is executed at a predetermined cycle. First, in step 201, the minimum starting axle torque is calculated based on the current vehicle weight, the gravitational acceleration, and the radius of the wheel 19. After calculating with a map or numerical formula, etc., it progresses to step 202, and the request | requirement axle torque according to an accelerator opening and a vehicle speed is calculated with a map or numerical formula. The processing in step 202 serves as a required axle torque calculation means in the claims.

  Thereafter, in steps 203 to 205, whether or not the vehicle is starting is determined by the same method as steps 104 to 106 in the first embodiment. If it is determined in these steps 203 to 205 that the vehicle is starting, the process proceeds to step 206, where the larger one of the requested axle torque and the minimum starting axle torque is set as the target axle torque at the time of starting the vehicle. .

That is, when the required axle torque is smaller than the minimum start axle torque, the minimum start axle torque is set as the target axle torque at the time of vehicle start.
Target axle torque = minimum starting axle torque

On the other hand, when the requested axle torque is equal to or greater than the minimum starting axle torque, the requested axle torque is set as the target axle torque at the time of starting the vehicle.
Target axle torque = Required axle torque

After that, the routine proceeds to step 208, where the target axle torque is calculated by dividing the target axle torque by the total gear ratio that is the speed change state of the power transmission system.
Target crankshaft torque = target axle torque / total gear ratio The processing of these steps 206 and 208 serves as means for calculating the target crankshaft torque at start in the claims.

Thereafter, when it is determined in steps 203 to 205 that the vehicle is not at the start, the routine proceeds to step 207, where the requested axle torque is set as the target axle torque as it is.
Target axle torque = Required axle torque

Thereafter, the routine proceeds to step 208, where the target crankshaft torque is obtained by dividing the target axle torque by the total gear ratio.
Target crankshaft torque = target axle torque ÷ total gear ratio

  In the second embodiment described above, when it is determined that the vehicle is starting, the larger of the requested axle torque and the minimum starting axle torque is selected as the target axle torque at the time of starting the vehicle, and this target axle torque is selected. Is converted into the target crankshaft torque at the start of the vehicle based on the total gear ratio, so that if the required axle torque is smaller than the minimum start axle torque, it is based on the minimum start axle torque (= target axle torque). Thus, the target crankshaft torque at the start of the vehicle can be set, and engine stall and backlash at the start of the vehicle can be prevented. On the other hand, when the requested axle torque is greater than or equal to the minimum starting axle torque, the target crankshaft torque at the start of the vehicle can be set based on the requested axle torque (= target axle torque), and according to the driver's request Start acceleration performance can be realized.

  In each of the first and second embodiments, the minimum starting axle torque is calculated based on the vehicle weight, the gravitational acceleration, and the radius of the wheel 19, but the minimum starting axle torque is converted into the steering angle and the road surface inclination angle. It may be corrected accordingly. The wheel angle with respect to the vehicle traveling direction changes according to the steering angle and the rolling resistance changes, and the gradient resistance changes according to the road surface inclination angle. Therefore, it is necessary to start the vehicle according to the steering angle and road surface inclination angle. Axle torque changes. Therefore, if the minimum starting axle torque is corrected according to the steering angle or the road surface inclination angle, the minimum starting axle torque corresponding to the change in the axle torque necessary for starting the vehicle according to the steering angle or the road surface inclination angle is obtained. It can correct | amend and can improve the calculation precision of the minimum start axle torque.

It is a schematic block diagram of the vehicle drive system in Example 1 of this invention. It is a flowchart which shows the flow of a process of the target crankshaft torque setting program of Example 1. FIG. It is a flowchart which shows the flow of a process of the target crankshaft torque setting program of Example 2.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Engine (internal combustion engine), 12 ... Crankshaft, 13 ... Clutch, 15 ... Manual transmission, 18 ... Axle, 19 ... Wheel, 21 ... Clutch switch (clutch operation amount detection means), 22 ... Shift switch (shift operation) Position detection means), 24 ... Vehicle speed sensor (vehicle speed detection means), 25 ... Vehicle weight sensor (vehicle weight detection means), 26 ... ECU (Minimum start axle torque calculation means, Minimum start crankshaft torque calculation means, Request crankshaft torque) Calculation means, vehicle start time determination means, start target crankshaft torque setting means, required axle torque calculation means, start target crankshaft torque calculation means)

Claims (5)

In a vehicle that transmits an output of a crankshaft of an internal combustion engine to an axle via a power transmission system,
Minimum starting axle torque calculating means for calculating a minimum starting axle torque required for starting the vehicle based on the vehicle information;
Minimum starting crankshaft torque calculating means for converting the minimum starting axle torque into a minimum starting crankshaft torque based on a shift state of the power transmission system;
Requested crankshaft torque calculating means for calculating requested crankshaft torque based on a driver's request;
Vehicle start time determination means for determining whether the vehicle is starting based on the information of the power transmission system and the information of the vehicle;
A starting target that sets a larger one of the minimum starting crankshaft torque and the required crankshaft torque as a target crankshaft torque at the time of starting the vehicle when the vehicle starting time determining means determines that the vehicle is starting A control device for an internal combustion engine, comprising: crankshaft torque setting means. In a vehicle that transmits an output of a crankshaft of an internal combustion engine to an axle via a power transmission system,
Minimum starting axle torque calculating means for calculating a minimum starting axle torque required for starting the vehicle based on the vehicle information;
Requested axle torque calculating means for calculating a requested axle torque based on a driver's request;
Vehicle start time determination means for determining whether the vehicle is starting based on the information of the power transmission system and the information of the vehicle;
When the vehicle starting time determining means determines that the vehicle is starting, a larger one of the minimum starting axle torque and the required axle torque is set as a target axle torque at the time of starting the vehicle, An internal combustion engine control device comprising: a starting target crankshaft torque calculating means for converting a target axle torque into a target crankshaft torque at the start of a vehicle based on a shift state of the power transmission system. Vehicle weight detection means for detecting the vehicle weight,
3. The control device for an internal combustion engine according to claim 1, wherein the minimum starting axle torque calculation means calculates the minimum starting axle torque based on the vehicle weight, gravitational acceleration, and wheel radius. Clutch operation amount detection means for detecting the operation amount of a clutch pedal for operating the clutch, vehicle speed detection means for detecting the vehicle speed, and shift operation position detection means for detecting the operation position of the shift lever for operating the manual transmission. ,
The vehicle start time determining means determines that the vehicle is starting when the operation amount of the clutch pedal is not more than a predetermined value, the vehicle speed is not more than a predetermined value, and the operation position of the shift lever is other than the neutral position. The control apparatus for an internal combustion engine according to any one of claims 1 to 3.   5. The control device for an internal combustion engine according to claim 1, wherein the minimum starting axle torque calculation unit corrects the minimum starting axle torque based on a steering angle and / or a road surface inclination angle. 6.

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