JP5058124B2 - Output control device for internal combustion engine - Google Patents

Description

  The present invention relates to an output control device for an internal combustion engine having a transmission, and more particularly to an output control device for controlling output during acceleration of the internal combustion engine.

  As a conventional output control device for this type of internal combustion engine, for example, one disclosed in Patent Document 1 is known. In this output control device, the required torque is calculated according to the detected accelerator opening and the engine speed. In order to limit the required torque, a steady state torque limit is calculated according to the engine speed. Further, a torque increase amount is calculated according to the detected gear stage of the transmission and the acceleration of the internal combustion engine. When the internal combustion engine is in an acceleration state, the steady state torque limit is temporarily increased according to the calculated steady state torque limit and the amount of torque increase. As a result, the torque limit is temporarily relaxed during acceleration, and the time required for acceleration is reduced.

  As described above, in this output control device for an internal combustion engine, the steady state torque limit is increased by the amount of torque increase that depends on the acceleration of the internal combustion engine. However, usually, different gear stages have different torques, so the time required for acceleration also differs. For example, at a high gear stage, the torque obtained is small, so the time required for acceleration is long. In the conventional output control apparatus described above, the magnitude of the torque increase amount is only set according to the gear stage, so that an appropriate acceleration time according to the gear stage cannot be ensured. For this reason, for example, in a high gear stage that requires a longer acceleration time, the acceleration restriction is completed before the acceleration is completed, so that a good acceleration feeling may not be obtained and drivability may be impaired. There is.

  The present invention has been made to solve the above-described problems, and can ensure an appropriate acceleration time according to the gear stage, thereby obtaining a good acceleration feeling and improving drivability. An object of the present invention is to provide an output control device for an internal combustion engine capable of performing

European Patent Application No. 1065364

In order to achieve the above object, the invention according to claim 1 is an output control device for an internal combustion engine 3 that is connected to a stepped transmission 4 and controls the output of the internal combustion engine 3 based on a required torque TRQ_REQ. Operating state detecting means (ECU 2, crank angle sensor 6, accelerator opening sensor 8) for detecting the operating state of the internal combustion engine 3 (engine speed NE, accelerator pedal opening AP in the embodiment (hereinafter the same in this section)); The required torque calculating means (ECU 2, steps 4 and 5 in FIG. 3) for calculating the required torque TRQ_REQ according to the detected operating state of the internal combustion engine 3, and the upper limit value for limiting the calculated required torque TRQ_REQ Upper limit value setting means (ECU2, step 10 in FIG. 4) for setting TRQ_LMTBASE, and a gear shift for detecting a gear ratio (gear stage NGR) of the transmission 4 Detection means (ECU 2, crank angle sensor 6, output shaft rotational speed sensor 11), acceleration determination means (ECU 2, FIGS. 5 and 6) for determining whether or not the internal combustion engine 3 is in an acceleration state, and acceleration determination means Thus, when it is determined that the internal combustion engine 3 is in the acceleration state, the increase period setting means (ECU 2, FIG. 5) sets the increase period (increase time T_CHG) of the upper limit value TRQ_LMTBASE according to the detected gear ratio. Step 38, FIG. 7) and an acceleration upper limit value setting means (ECU2, FIG. 4) for setting the upper limit value TRQ_LMTBASE to a larger acceleration upper limit value TRQ_LMT in the set increase period, the increase period setting means The increase period is set to a larger value as the gear ratio is smaller .

  According to this output control device, the required torque is calculated according to the detected operating state of the internal combustion engine, and the upper limit value is set to limit the calculated required torque. Further, when it is determined that the internal combustion engine is in an acceleration state, an increase period of the upper limit value is set by the increase period setting means according to the detected gear ratio of the transmission, and in the set increase period The acceleration upper limit value setting means sets the acceleration upper limit value to a larger acceleration upper limit value. Thereby, the restriction | limiting of request | requirement torque is relieve | moderated by using a larger upper limit at the time of acceleration as an upper limit. In addition, since an increase period that relaxes the restriction on the required torque is set according to the gear ratio, an appropriate acceleration time according to the gear ratio can be secured, thereby providing a good acceleration feeling and drivability. Can be improved.

Further, as described above, the smaller the transmission gear ratio, the smaller the torque and the longer the time required for acceleration. According to the present invention, the smaller the gear ratio, the longer the acceleration upper limit value is maintained by setting the increase period to a larger value, and the period during which the restriction on the required torque is relaxed. Even if it is small, a sufficient acceleration time can be secured and a good acceleration feeling can be obtained.

The invention according to claim 2 is the output control device for the internal combustion engine 3 according to claim 1, wherein the acceleration upper limit value setting means returns the acceleration upper limit value TRQ_LMT to the upper limit value TRQ_LMTBASE after the increase period has elapsed. Further, the acceleration upper limit value TRQ_LMT is gradually decreased at a speed corresponding to the gear ratio.

  According to this configuration, after the end of the increase period, the acceleration upper limit value gradually decreases and returns to the upper limit value. As a result, it is possible to avoid a torque shock due to a sudden decrease in torque when the acceleration upper limit value is rapidly reduced to the upper limit value, and to ensure good drivability. In addition, since the reduction speed of the acceleration upper limit value is set to a speed corresponding to the gear ratio, the acceleration upper limit value can be returned at an appropriate speed corresponding to the increase period.

  Hereinafter, preferred embodiments of the present invention will be described with reference to the drawings. FIG. 1 schematically shows an internal combustion engine to which the output control apparatus according to the present embodiment is applied. The internal combustion engine (hereinafter referred to as “engine”) 3 is, for example, an in-line four-cylinder type diesel engine mounted on a vehicle V.

  As shown in FIG. 2, the engine 3 is connected to front wheels W and W that are drive wheels via a transmission 4. The transmission 4 is an automatic transmission having first to fifth forward speeds and one reverse speed.

  The engine 3 is provided with a crank angle sensor 6 (see FIG. 1). The crank angle sensor 6 is composed of a magnet rotor and an MRE pickup (both not shown), and a CRK signal and a TDC signal, which are pulse signals, are sent to the ECU 2 (see FIG. 1) as the crankshaft 3c rotates. Output.

  The CRK signal is output every predetermined crank angle (for example, 30 °). The ECU 2 calculates the engine speed (hereinafter referred to as “engine speed”) NE of the engine 3 based on the CRK signal. The TDC signal is a signal indicating that the piston 3b of the cylinder 3a is at a predetermined crank angle position near the TDC (top dead center) at the start of the intake stroke, and in the case of the four-cylinder type as in the present embodiment. Is output every 180 ° of crank angle.

  The output shaft 5 of the transmission 4 is provided with an output shaft rotational speed sensor 11 for detecting the rotational speed (hereinafter referred to as “output shaft rotational speed”) NOUT. The ECU 2 calculates the gear stage NGR set in the transmission 4 based on the output shaft speed NOUT and the engine speed NE. When the gear stage NGR is calculated in this way, the gear ratio is also uniquely determined, and the gear ratio is smaller as the gear stage NGR is higher.

  An engine water temperature sensor 7 is provided in the cylinder block of the engine 3. The engine water temperature sensor 7 detects the engine water temperature TW, which is the temperature of the cooling water circulating in the cylinder block, and outputs a detection signal representing it to the ECU 2.

  Further, an accelerator opening sensor 8, an outside air temperature sensor 9 and an atmospheric pressure sensor 10 are connected to the ECU 2. An accelerator opening sensor 8 detects an operation amount (hereinafter referred to as “accelerator opening”) AP of an accelerator pedal (not shown), an outside air temperature sensor 9 detects an outside air temperature TAIR, and an atmospheric pressure sensor 10 detects an atmospheric pressure PA. These detection signals are output to the ECU 2.

  The ECU 2 is composed of a microcomputer including a CPU, a RAM, a ROM, an I / O interface (all not shown), and the like of the engine 3 according to the detection signals of the various sensors 6 to 11 described above. While discriminating the operating state, various control processes are executed.

  In the present embodiment, the ECU 2 corresponds to an operating state detection unit, a required torque calculation unit, an upper limit value setting unit, a gear ratio detection unit, an acceleration determination unit, an increase period setting unit, and an acceleration upper limit value setting unit.

  FIG. 3 shows a main flow of the output control process of the engine 3 executed by the ECU 2. This output control process calculates a required torque TRQ_REQ that is used together with the engine speed NE to determine the fuel injection amount. This process is executed at a predetermined cycle T.

  In this process, first, in step 1 (illustrated as “S1”, the same applies hereinafter), a basic map is searched by searching a predetermined map (not shown) according to the detected engine speed NE and accelerator pedal opening AP. The required torque TRQ_REQBASE is calculated.

  Next, an upper limit value TRQ_LMT of the required torque TRQ_REQ is calculated (step 2). FIG. 4 shows the subroutine. First, in step 10, a basic upper limit value TRQ_LMTBASE is calculated according to the engine speed NE.

  Next, acceleration determination is performed (step 11). 5 and 6 show the subroutine. First, in steps 30 to 32, whether or not the detected engine water temperature TW is within a predetermined range defined by the first and second predetermined temperatures T1 and T2, whether or not the detected outside air temperature TAIR is third and Whether or not it is within a predetermined range defined by the fourth predetermined temperatures T3 and T4, and the detected atmospheric pressure PA is within a predetermined range defined by the first and second predetermined pressures P1 and P2. Whether or not each is determined.

  When any of these determination results is NO, it is assumed that the engine water temperature TW, the outside air temperature TAIR, or the atmospheric pressure PA is not in a condition suitable for increasing the upper limit value TRQ_LMT during acceleration, and the acceleration determination flag F_ACCON is set to “0”. ”(Step 50), the timer value of the up-counting type acceleration timer (hereinafter referred to as“ acceleration timer value ”) TMMAC is reset to 0 (step 51), and this process ends.

  When the determination results in steps 30 to 32 are all YES and the engine water temperature TW, the outside air temperature TAIR, and the atmospheric pressure PA are within the predetermined ranges, it is determined whether or not the acceleration prohibition flag F_FAIL is “1” ( Step 33).

  This acceleration prohibition flag F_FAIL is set to “1”, indicating that acceleration should be prohibited when it is determined that sensors such as the accelerator opening sensor 8 are malfunctioning.

  Therefore, if the determination result in step 33 is YES and acceleration is prohibited due to a failure, the acceleration determination flag F_ACCON is set to “0” and the acceleration timer value TMACC is set by executing the steps 50 and 51. Reset to 0 to end this process.

  On the other hand, when the determination result in step 33 is NO, it is determined whether or not the engine speed NE is within a range defined by the first and second predetermined speeds N1 and N2 (step 34). If the determination result is NO and the engine speed NE is not within the predetermined range, the processing is terminated after executing the steps 50 and 51 assuming that the engine 3 is not in the acceleration state.

  If the determination result in the step 34 is YES, it is determined whether or not the accelerator opening AP is a predetermined opening AP_REF or more (step 35). If the determination result is NO and the accelerator opening AP is smaller than the predetermined opening AP_REF, it is determined that the engine 3 is not in the acceleration state, the steps 50 and 51 are executed, and this process is terminated.

  If the determination result in step 35 is YES and the accelerator opening AP is equal to or greater than the predetermined opening AP_REF, it is determined that the condition for increasing the upper limit value TRQ_LMT during acceleration is satisfied, and the acceleration determination flag F_ACCON is “0”. Whether or not (step 36).

  When the determination result is YES, that is, immediately after the engine 3 shifts from the non-accelerated state to the accelerated state, the acceleration determination flag F_ACCON is set to “1” (step 37).

  Next, an increase time T_CHG of the basic upper limit value TRQ_LMTBASE is set by searching the table of FIG. 7 according to the gear stage NGR of the transmission 4 (step 38).

  In this table, the increase time T_CHG (TC1 to TC5) is set to a larger value as the gear stage NGR is higher, that is, as the gear ratio is smaller. This is because the smaller the gear ratio, the smaller the torque and the longer the time required for acceleration.

  Next, in step 39, the increased upper limit value TRQ_LMT is gradually decreased to set a return time T_RAMP for returning to the basic upper limit value TRQ_LMTBASE. The return time T_RAMP is set by searching the table of FIG. 8 according to the gear stage NGR. In this table, the return time T_RAMP (TR1 to TR5) is set to a larger value as the gear stage NGR is higher, that is, as the gear ratio is smaller. This is because the smaller the gear ratio, the longer the time required for acceleration, so that the upper limit value TRQ_LMT is appropriately restored over a longer time corresponding to the increase time T_CHG being set longer. .

  After step 39, the process proceeds to step 40. When the determination result at step 36 is NO, steps 37 to 39 are skipped and the process proceeds directly to step 40.

  In step 40, it is determined whether or not the acceleration timer value TMACC is smaller than the increase time T_CHG set in step 38. When the determination result is YES, it means that the upper limit value TRQ_LMT is to be increased because the acceleration is during the acceleration period, the acceleration increase flag F_ACC is set to “1” (step 41), and the return flag F_RAMP is set to “ It is set to “0” (step 42), and this process is terminated.

  On the other hand, if the determination result in step 40 is NO and the acceleration timer value TMACC is equal to or greater than the increase time T_CHG, the acceleration increase flag F_ACC is set to “0”, assuming that the increase period has ended (step 43).

  Next, it is determined whether or not the acceleration timer value TMACC is smaller than the return time T_RAMP set in step 39 (step 44). If the determination result is YES, the return flag F_RAMP is set to “1” because the return period is during acceleration (step 45), and this process ends.

  On the other hand, if the determination result in step 44 is NO and the acceleration timer value TMMAC is equal to or longer than the return time T_RAMP, it is determined that the return period has ended, the process proceeds to step 42, and the return flag F_RAMP is set to “0”. The process ends.

  Returning to FIG. 4, in step 12 following step 11, an acceleration correction amount TRQACC is calculated. FIG. 9 shows the subroutine. First, in step 20, it is determined whether or not the acceleration increase flag F_ACC is “1”. If the determination result is YES and the engine is in the increase period, a basic value TRQACC_BASE of the acceleration correction amount is calculated by searching a predetermined map (not shown) according to the engine speed NE and the gear stage NGR ( Step 21).

  Next, in step 22, a water temperature correction coefficient KTW is calculated by searching a predetermined map (not shown) according to the engine water temperature TW. In this map, the water temperature correction coefficient KTW is set to a larger value because the lower the engine water temperature TW, the greater the friction in the engine 3 and the greater the required torque TRQ_REQ.

  Next, the acceleration correction amount TRQACC is calculated by multiplying the basic value TRQACC_BASE calculated in step 21 by the water temperature correction coefficient KTW (step 23), and this process ends.

  On the other hand, when the determination result of step 20 is NO and not during the increase period, it is determined whether or not the return flag F_RAMP is “1” (step 24).

ここで、Ｔは本処理の実行周期である。また、復帰時間Ｔ＿ＲＡＭＰと増大時間Ｔ＿ＣＨＧとの差（Ｔ＿ＲＡＭＰ−Ｔ＿ＣＨＧ）は、実質的な復帰期間を表すので、これを実行周期Ｔで除した分母全体（（Ｔ＿ＲＡＭＰ−Ｔ＿ＣＨＧ）／Ｔ）は、復帰期間中の本処理の実行回数に相当する。したがって、この実行回数で、加速時補正量ＴＲＱＡＣＣを除することによって得られる、トルク減少量ΔＴＲＱは、復帰期間の終了時に上限値ＴＲＱ＿ＬＭＴを基本上限値ＴＲＱ＿ＬＭＴＢＡＳＥに復帰させるのに必要な、本処理１回あたりのトルク減少量に相当する。 When the determination result is YES, since the increase period has ended and the period has shifted to the return period, a torque decrease amount ΔTRQ for returning the increased upper limit value TRQ_LMT to the basic upper limit value TRQ_LMTBASE is expressed by the following equation (1). Calculate (step 25).

Here, T is the execution cycle of this process. Further, the difference (T_RAMP−T_CHG) between the return time T_RAMP and the increase time T_CHG represents a substantial return period, and therefore the entire denominator ((T_RAMP−T_CHG) / T) obtained by dividing this by the execution cycle T This corresponds to the number of executions of this process during the period. Therefore, the torque reduction amount ΔTRQ obtained by dividing the acceleration correction amount TRQACC by the number of executions is the processing 1 necessary for returning the upper limit value TRQ_LMT to the basic upper limit value TRQ_LMTBASE at the end of the return period. This corresponds to the amount of torque reduction per rotation.

  Next, a value obtained by subtracting the calculated torque reduction amount ΔTRQ from the acceleration correction amount TRQACC calculated in step 23 is set as a new acceleration correction amount TRQACC (step 26), and this process is terminated. By repeatedly performing such subtraction using the torque decrease amount ΔTRQ, the upper limit value TRQ_LMT gradually decreases and returns to the basic upper limit value TRQ_LMTBASE at the end of the return period.

  When the determination result in step 24 is NO, since it is neither during the increase period nor during the return period, the acceleration correction amount TRQACC is set to 0 (step 27), and this process ends.

  Returning to FIG. 4, in step 13, the upper limit value TRQ_LMT is calculated by adding the acceleration correction amount TRQACC calculated in step 12 to the basic upper limit value TRQ_LMTBASE calculated in step 10, and the present process ends. To do.

  Returning to FIG. 3, in Steps 3 to 5, the basic required torque TRQ_REQBASE is limited using the upper limit value TRQ_LMT calculated in Step 2. First, in step 3, it is determined whether or not the basic required torque TRQ_REQBASE is larger than the upper limit value TRQ_LMT. When the determination result is NO and TRQ_REQBASE ≦ TRQ_LMT, the basic required torque TRQ_REQBASE is set as the required torque TRQ_REQ (step 4), and this process ends.

  On the other hand, if the determination result in step 3 is YES and TRQ_REQBASE> TRQ_LMT, the upper limit value TRQ_LMT is set as the required torque TRQ_REQ (step 5), and this process ends.

  The required torque TRQ_REQ calculated as described above is used to determine the fuel injection amount injected into the engine 3 together with the engine speed NE, thereby controlling the output of the engine 3.

  FIG. 10 shows an operation example obtained by the output control processing described so far. In this example, the acceleration determination condition of the engine 3 is not satisfied before time t1, and therefore the acceleration correction amount TRQACC is 0 and the required torque TRQ_REQ is set to the basic upper limit value TRQ_LMTBASE.

  From this state, when the acceleration determination condition is satisfied (t1), the acceleration determination flag F_ACCON is set to “1”, the acceleration timer starts counting, and the increase time T_CHG and the return time T_RAMP are set according to the gear stage NGR. It is set (steps 38 and 39). Further, the acceleration increase flag F_ACC is set to “1” (step 41), and the process proceeds to an increase period.

  In this increase period, the acceleration correction amount TRQACC is set according to the basic value TRQACC_BASE and the water temperature correction coefficient KTW (step 23), and is added to the basic upper limit value TRQ_LMTBASE, thereby calculating the upper limit value TRQ_LMT (step). 13). Thereby, in the increase period, upper limit value TRQ_LMT of required torque TRQ_REQ is set to a larger value.

  Thereafter, when the acceleration timer value TMACC reaches the increase time T_CHG (step 40: NO) (t2), the acceleration increase flag F_ACC is set to “0” (step 43), the increase period ends and the return is made. The flag F_RAMP is set to “1” (step 45), and the process proceeds to the return period.

  In this return period, the acceleration correction amount TRQACC gradually decreases by subtracting the torque reduction amount ΔTRQ from the acceleration correction amount TRQACC at the start of each control process. Along with this, the upper limit value TRQ_LMT gradually decreases.

  Thereafter, when the acceleration timer value TMACC reaches the return time T_RAMP (step 44: NO) (t3), the return flag F_RAMP is set to “0” (step 42), and the return period ends. At that time, since the acceleration correction amount TRQACC is 0, the upper limit value TRQ_LMT has returned to the basic upper limit value TRQ_LMTBASE.

  As described above, according to the present embodiment, the basic required torque TRQ_REQBASE is calculated according to the operating state of the engine 3, and the basic upper limit value TRQ_LMTBASE is set to limit the calculated basic required torque TRQ_REQBASE. The Further, when it is determined that the engine 3 is in the acceleration state, the increase time T_CHG of the basic upper limit value TRQ_LMTBASE is set according to the gear stage NGR of the transmission 4. In the increase period thus set, the acceleration correction amount TRQACC is set to a larger value, whereby the upper limit value TRQ_LMT is set to a larger value. In this way, by using a larger upper limit value TRQ_LMT, the restriction on the required torque TRQ_REQ is relaxed. Further, since the increase time T_CHG that relaxes the restriction on the required torque TRQ_REQ is set according to the gear stage NGR, it is possible to secure an appropriate acceleration time according to the gear stage NGR, thereby obtaining a good feeling of acceleration. , Drivability can be improved.

  In the return period after the end of the increase period, the upper limit value TRQ_LMT is gradually decreased by the torque decrease amount ΔTRQ, and returns to the basic upper limit value TRQ_LMTBASE at the end of the return period. As a result, it is possible to avoid a torque shock due to a rapid decrease in torque and to ensure good drivability. Further, the higher the gear stage NGR, that is, the smaller the gear ratio, the longer the return time T_CHG is set. Accordingly, the upper limit value TRQ_LMT is set to take a longer time corresponding to the increase time T_CHG being set longer. It can be restored properly.

  In addition, this invention can be implemented in various aspects, without being limited to the described embodiment. For example, in the embodiment, the upper limit value TRQ_LMT is calculated by adding the acceleration correction amount TRQACC to the basic upper limit value TRQ_LMTBASE, but instead, the upper limit value TRQ_LMT including the acceleration correction amount TRQACC is directly calculated. May be.

  Further, in the embodiment, the return time T_RAMP is set, and the torque decrease amount ΔTRQ is calculated backward so that the acceleration correction amount TRQACC becomes 0 at the end of the return period. However, first, the torque is reduced according to the gear stage NGR. The decrease amount ΔTRQ may be determined, and the return period may end when the upper limit value TRQ_LMT becomes equal to the basic upper limit value TRQ_LMTBASE. Further, the torque reduction amount ΔTRQ may be set to a predetermined value regardless of the gear stage NGR.

  Further, in the embodiment, the gear stage NGR of the transmission 4 is calculated based on the output shaft rotational speed NOUT and the engine rotational speed NE. However, the detection method is arbitrary, for example, a sensor is used to calculate the gear stage NGR. It may be detected directly.

  In the embodiment, the transmission connected to the engine 3 is the stepped transmission 4, but may be a continuously variable transmission. Also in this case, for example, the gear ratio is calculated according to the engine speed NE and the output shaft speed NOUT, and the increase time T_CHG and the return time T_RAMP correspond to the respective predetermined tables according to the calculated gear ratio. Set by searching. With such a configuration, the effects of the above-described embodiment can be obtained similarly.

  Moreover, although embodiment is an example which applied this invention to the diesel engine mounted in the vehicle, this invention is not restricted to this, You may apply to various engines, such as gasoline engines other than a diesel engine, Further, the present invention can also be applied to engines other than those for vehicles, for example, marine vessel propulsion engines such as outboard motors having a crankshaft arranged vertically. In addition, it is possible to appropriately change the detailed configuration within the scope of the gist of the present invention.

It is a figure showing roughly an internal-combustion engine to which an output control device by this embodiment is applied. 1 is a diagram illustrating a schematic configuration of a vehicle to which an output control device according to an embodiment is applied. It is a flowchart which shows the main flow of an output control process. It is a flowchart which shows the subroutine of an upper limit calculation process. It is a flowchart which shows the subroutine of an acceleration determination process. 6 is a flowchart showing a continuation of FIG. It is a table for setting increase time. It is a table for setting a return time. It is a flowchart which shows the subroutine of the correction amount calculation process at the time of acceleration. It is a timing chart which shows the example of operation obtained by control processing by an embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Output control apparatus 2 ECU (Operating state detection means, request torque calculation means, upper limit value setting means, transmission ratio detection means, acceleration determination means, increase period setting means, acceleration upper limit value setting means)
3 Engine (Internal combustion engine)
6 Crank angle sensor (driving condition detecting means, gear ratio detecting means)
8 Accelerator opening sensor (operating state detection means)
11 Output shaft rotational speed sensor (speed ratio detecting means)
TRQ_REQ Required torque
NE engine speed
AP accelerator opening TRQ_LMTBASE Basic upper limit (upper limit)
NGR gear stage (speed ratio)
T_CHG increase time TRQ_LMT upper limit (acceleration upper limit)

Claims (2)

An output control device for an internal combustion engine that is connected to a transmission and controls the output of the internal combustion engine based on a required torque,
An operating state detecting means for detecting an operating state of the internal combustion engine;
Requested torque calculating means for calculating the required torque according to the detected operating state of the internal combustion engine;
An upper limit setting means for setting an upper limit for limiting the calculated required torque;
Gear ratio detecting means for detecting a gear ratio of the transmission;
Acceleration determining means for determining whether or not the internal combustion engine is in an acceleration state;
An increase period setting means for setting an increase period of the upper limit value according to the detected gear ratio when the acceleration determination means determines that the internal combustion engine is in an acceleration state;
An acceleration upper limit value setting means for setting the upper limit value to a larger acceleration upper limit value in the set increase period ;
The output control apparatus for an internal combustion engine, wherein the increase period setting means sets the increase period to a larger value as the speed ratio is smaller . The acceleration upper limit value setting unit gradually decreases the acceleration upper limit value at a speed corresponding to the gear ratio when returning the acceleration upper limit value to the upper limit value after the increase period has elapsed. The output control apparatus for an internal combustion engine according to claim 1, characterized in that:

Images