Correction device and correction method

Abstract

To provide a correction device and a correction method capable of performing a more appropriate correction.SOLUTION: A correction device 1 estimates an intake amount separately on the basis of a sensor value of each of an intake pressure sensor A1 that belongs to a first system and an air fuel ratio sensor A2 that belongs to a second system independent of the first system, and calculates a first error rate and a second error rate that are the error rates between the estimated intake pressure and a sensor value of an intake amount sensor A0. The correction device 1 acquires a first estimation amount that is an estimation amount of the intake amount on the basis of the first error rate, and the sensor value of the intake amount sensor A0, and acquires a second estimation amount that is an estimation amount of the intake amount on the basis of the second error rate, and the sensor value of the intake amount sensor A0. The correction device 1 acquires a correction value of the intake amount by weighting and adding each of the sensor value of the intake amount sensor A0, the first estimation amount, and the second estimation amount.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The present invention relates to a correction device and a correction method.

Background Art

[0002] Patent Document 1 describes an intake control device that performs learning control to compensate for an error in an air quantity sensor that detects the intake air quantity of an internal combustion engine. This device calculates an estimated value of the intake air quantity based on the air-fuel ratio of the exhaust gas of the internal combustion engine detected by an air-fuel ratio sensor and the fuel injection quantity of the internal combustion engine. Further, in this device, based on the calculated estimated value of the intake air quantity and the like, the actually measured air quantity, which is the detected value of the intake air quantity by the air quantity sensor, is corrected.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When correcting an air quantity sensor based on the detected value of one system including an air-fuel ratio sensor as in the device described in Patent Document 1 above, the error of the air-fuel ratio sensor directly affects the correction value. Therefore, when the error of the air-fuel ratio sensor exceeds the error of the air quantity sensor to be corrected, it may be difficult to perform appropriate correction, such as an increase in the error. When the error of the air quantity sensor increases in this way, the internal recognition value may deviate, resulting in unintended consequences.

[0005] Therefore, an object of the present invention is to provide a correction device and a correction method capable of more appropriate correction.

Means for Solving the Problems

[0006] The correction device according to the present invention is "[1] a correction device for correcting an introduction amount sensor that obtains an air introduction amount in a device that receives air introduction, the correction device being a sensor different from the introduction amount sensor, estimating the air introduction amount based on a sensor value of a first sensor belonging to a first system, and calculating a first error rate that is an error rate between the estimated air introduction amount and the sensor value of the introduction amount sensor; a first estimation unit that obtains a first estimated amount that is an estimated amount of the air introduction amount based on the sensor value of the introduction amount sensor and the first error rate; a second sensor that is different from the introduction amount sensor and belongs to a second system independent of the first system, estimating the air introduction amount based on a sensor value of the second sensor, and calculating a second error rate that is an error rate between the estimated air introduction amount and the sensor value of the introduction amount sensor; a second estimation unit that obtains a second estimated amount that is an estimated amount of the air introduction amount based on the sensor value of the introduction amount sensor and the second error rate; and a correction value acquisition unit that obtains a correction value of the air introduction amount by adding up while weighting each of the sensor value of the introduction amount sensor, the first estimated amount, and the second estimated amount."

[0007] The correction method according to the present invention is "[5] a correction method for correcting an introduction amount sensor that obtains an air introduction amount in a device that receives air introduction, the correction method being for a sensor different from the introduction amount sensor, estimating the air introduction amount based on a sensor value of a first sensor belonging to a first system, and calculating a first error rate that is an error rate between the estimated air introduction amount and the sensor value of the introduction amount sensor; a first estimation step of obtaining a first estimated amount that is an estimated amount of the air introduction amount based on the sensor value of the introduction amount sensor and the first error rate after the first error rate calculation step; estimating the air introduction amount based on a sensor value of a second sensor that is a sensor different from the introduction amount sensor and belongs to a second system independent of the first system, and calculating a second error rate that is an error rate between the estimated air introduction amount and the sensor value of the introduction amount sensor; a second estimation step of obtaining a second estimated amount that is an estimated amount of the air introduction amount based on the sensor value of the introduction amount sensor and the second error rate after the second error rate calculation step; and a correction value acquisition step of obtaining a correction value of the air introduction amount by adding up the sensor value of the introduction amount sensor, the first estimated amount, and the second estimated amount while weighting each of them after the first estimation step and the second estimation step."

[0008] These devices and methods are for correcting an introduction amount sensor that obtains an air introduction amount in a device that receives air introduction. Specifically, based on the sensor values of a first sensor that is different from the introduction amount sensor and belongs to a first system, and a second sensor that is different from the introduction amount sensor and belongs to a second system independent of the first system, the air introduction amount is separately estimated, and a first error rate and a second error rate, which are the error rates between the estimated air introduction amount and the sensor value of the introduction amount sensor, are calculated. Also, based on the first error rate and the sensor value of the introduction amount sensor, a first estimated amount, which is an estimated amount of the air introduction amount, is obtained, and based on the second error rate and the sensor value of the introduction amount sensor, a second estimated amount, which is an estimated amount of the air introduction amount, is obtained. Then, a correction value of the air introduction amount is obtained by adding up the sensor value of the introduction amount sensor, the first estimated amount, and the second estimated amount while weighting each of them.

[0009] In this way, by calculating the error rate based on the sensor values of at least two systems of sensors that are independent of each other, and obtaining the correction value of the air introduction amount of the introduction amount sensor based on the error rate, the errors of each sensor are averaged and a correction value closer to the actual value can be obtained. Therefore, according to these devices and methods, more appropriate correction of the introduction amount sensor becomes possible.

[0010] The correction device according to the present invention may be the one described in [2] "The first estimation unit generates a third error rate by reflecting the currently calculated first error rate at a ratio less than 1 with respect to the previously calculated first error rate, and obtains the first estimated amount by multiplying the third error rate by the sensor value of the introduction amount sensor. The second estimation unit generates a fourth error rate by reflecting the currently calculated second error rate at a ratio less than 1 with respect to the previously calculated second error rate, and obtains the second estimated amount by multiplying the fourth error rate by the sensor value of the introduction amount sensor, as described in the above [1]". In this case, even when a specific value is calculated in a certain calculation of the error rate, the influence of the specific error rate is mitigated.

[0011] The correction device according to the present invention may be "[3] a first determination unit that determines whether or not the estimation accuracy of the air introduction amount in the first error rate calculation unit is high, and a second determination unit that determines whether or not the estimation accuracy of the air introduction amount in the second error rate calculation unit is high, wherein the first error rate calculation unit estimates the air introduction amount and calculates the first error rate when the first determination unit determines that the estimation accuracy of the air introduction amount is high, and the second error rate calculation unit estimates the air introduction amount and calculates the second error rate when the second determination unit determines that the estimation accuracy of the air introduction amount is high, the correction device according to [1] or [2] above". In this way, by calculating the error rate in a state where the estimation accuracy is high, it becomes possible to reduce noise.

[0012] The correction device according to the present invention may be "[4] the device is an engine mounted on a vehicle, the air introduction amount is the intake air amount of the engine, and the introduction amount sensor is an intake air amount sensor that acquires the intake air amount in the engine, the correction device according to any one of [1] to [3] above". In this case, it becomes possible to perform more appropriate correction of the intake air amount sensor of the engine. As a result, it becomes possible to appropriately perform purification processing of exhaust gas and the like based on an appropriate intake air amount.

Effects of the Invention

[0013] According to the present invention, it is possible to provide a correction device and a correction method capable of more appropriate correction.

Brief Description of the Drawings

[0014]

Figure 1

Figure 2

Figure 3

Embodiments for Carrying Out the Invention

[0015] Hereinafter, a correction device and a correction method according to this embodiment will be described with reference to the drawings.

[0016] FIG. 1 is a block diagram showing a functional configuration of a correction device according to this embodiment. The correction device 1 shown in FIG. 1 is for correcting an intake air amount sensor that acquires the intake air amount of an engine mounted on a vehicle. The engine is an example of a device that receives the introduction of air, and the intake air amount sensor is an example of an introduction amount sensor that acquires the air introduction amount in the device. Further, the intake air amount is an example of the air introduction amount in the device.

[0017] The correction device 1 can be configured, for example, in an ECU (Electronic Control Unit) mounted on a vehicle. The ECU is an electronic control unit having, for example, a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc. In the ECU, for example, a program stored in the ROM is loaded into the RAM and executed by the CPU to realize various functions of the correction device 1 described later.

[0018] In addition, an intake air amount sensor A0, an intake air pressure sensor A1, and an air-fuel ratio sensor A2 are provided in the vehicle. The intake air amount sensor A0 is, for example, an air flow sensor provided in the intake passage of the engine. The intake air pressure sensor A1 is, for example, a boost pressure sensor provided in the intake manifold of the engine. The air-fuel ratio sensor A2 is, for example, a sensor provided in the exhaust passage of the engine and detects the air-fuel ratio of the exhaust gas of the engine. The air-fuel ratio sensor A2 may be an oxygen concentration sensor provided in the exhaust passage of the engine and detecting the oxygen concentration in the exhaust gas of the engine. In this case, the air-fuel ratio can be acquired based on the oxygen concentration of the exhaust gas detected by the oxygen concentration sensor, the oxygen concentration of the atmosphere, and the indicated injection amount of fuel in the engine injector.

[0019] The intake pressure sensor A1 is a sensor different from the intake air quantity sensor A0 and is a first sensor belonging to the first system on the intake side of the engine. The air-fuel ratio sensor A2 is a sensor different from the intake air quantity sensor A0 and is a second sensor belonging to the second system on the exhaust side of the engine. The first system and the second system are independent of each other. The correction device 1 is connected to the above intake air quantity sensor A0, intake pressure sensor A1, and air-fuel ratio sensor A2, and receives the input of the sensor values of each sensor.

[0020] Functionally, the correction device 1 includes a first determination unit 11, a first error rate calculation unit 12, a first estimation unit 13, a second determination unit 21, a second error rate calculation unit 22, a second estimation unit 23, and a correction value acquisition unit 30. Subsequently, the operations of each functional unit of the correction device 1 will be described.

[0021] FIG. 2 is a flowchart showing the main steps of the correction method according to the present embodiment. The correction method shown in FIG. 2 is executed in the above correction device 1. Therefore, each step of the correction method shown in FIG. 2 shows an example of the operation of each functional unit of the correction device 1. As shown in FIG. 2, in the correction method according to the present embodiment, first, the correction device 1 reads the stored value of the error rate (step S1). In step S1, in the situation where the correction method shown in FIG. 2 is repeatedly executed, the error rate of the intake pressure sensor A1 (the first error rate described later) updated at the previous execution and the error rate of the air-fuel ratio sensor A2 (the second error rate described later) are read.

[0022] Subsequently, the estimation of the intake air quantity based on the intake pressure sensor A1 belonging to the first system and the estimation of the intake air quantity based on the air-fuel ratio sensor A2 belonging to the second system are executed in parallel. The estimation of the intake air quantity based on the intake pressure sensor A1 includes steps S11 to S14, and the estimation of the intake air quantity based on the air-fuel ratio sensor A2 includes steps S21 to S24. These two sets of steps are not limited in terms of time sequence. For the sake of convenience, steps S11 to S14 related to the estimation of the intake air quantity based on the intake pressure sensor A1 will be described first.

[0023] That is, in the subsequent step, the first determination unit 11 determines whether the estimation accuracy of the intake air amount in the first error rate calculation unit 12 is high (step S11). More specifically, as an example, the first determination unit 11 can determine whether the estimation accuracy of the intake air amount in the first error rate calculation unit 12 is high based on whether the vehicle is traveling steadily. In this case, the first determination unit 11 can determine that the estimation accuracy is high when the vehicle is traveling steadily. On the other hand, for example, when the engine speed is higher than a predetermined threshold value and it is determined that the vehicle is not traveling steadily, it can be determined that the estimation accuracy is not high.

[0024] As a result of the determination in step S11, when it is determined that the estimation accuracy is high (step S11: YES), the first error rate calculation unit 12 estimates the intake air amount in the engine based on the sensor value of the intake pressure sensor A1, and calculates the first error rate, which is the error rate between the estimated intake air amount and the current sensor value of the intake air amount sensor A0 (step S12: first error rate calculation step).

[0025] In step S12, as an example, the first error rate calculation unit 12 calculates the density of the intake air based on the intake pressure obtained by the intake pressure sensor A1 and the temperature obtained by the intake manifold temperature sensor. Then, the volume of the air inhaled according to the rotation of the engine is acquired, and the intake air amount can be estimated by multiplying the volume by the density. That is, here, the intake air amount can be estimated based on the amount of working gas. Then, the first error rate calculation unit 12 can calculate the first error rate by dividing the intake air amount estimated in this way by the sensor value (actual measurement value of the intake air amount) of the actual intake air amount sensor A0.

[0026] Note that as a result of the determination in step S11, when it is determined that the estimation accuracy is low (step S11: NO), the determination in step S11 is repeatedly performed at a predetermined time interval.

[0027] In the subsequent step, the first estimation unit 13 generates a third error rate by reflecting the currently calculated first error rate on the previously calculated first error rate, which is the value read in step S1, at a rate less than 1 (e.g., 50%) (step S13: first estimation step). The third error rate is the first error rate updated based on the current sensor value of the intake pressure sensor A1. This mitigates the impact of the specific value even if the currently calculated first error rate is a specific value.

[0028] Subsequently, the first estimation unit 13 generates (acquires) a first estimated value, which is an estimated intake air amount in the first system, based on the current sensor value of the current intake air amount sensor A0 and the first error rate (step S14: first estimation step). More specifically, the first estimation unit 13 obtains the first estimated value by multiplying the third error rate (updated first error rate) generated based on the first error rate in step S13 by the sensor value of the intake air amount sensor A0. Thus, the estimation of the intake air amount based on the intake pressure sensor A1 belonging to the first system is completed.

[0029] Subsequently, the estimation of the intake air amount based on the air-fuel ratio sensor A2 belonging to the second system will be described. That is, here, the second determination unit 21 determines whether the estimation accuracy of the intake air amount in the second error rate calculation unit 22 is high (step S21). More specifically, the second determination unit 21 can perform the determination in the same manner as the first determination unit 11. However, when using an oxygen concentration sensor provided in the exhaust passage as the air-fuel ratio sensor A2, the accuracy tends to be high where the oxygen concentration is low and low where the oxygen concentration is high. Therefore, the second determination unit may determine the high or low estimation accuracy according to the high or low oxygen concentration.

[0030] As a result of the determination in step S21, if it is determined that the estimation accuracy is high (step S21: YES), the second error rate calculation unit 22 estimates the intake air amount in the engine based on the sensor value of the air-fuel ratio sensor A2, and calculates a second error rate, which is the error rate between the estimated intake air amount and the current sensor value of the intake air amount sensor A0 (step S22: second error rate calculation step).

[0031] In step S22, as an example, the second error rate calculation unit 22 can estimate the intake air amount by multiplying the fuel injection amount instructed by the injector by the air-fuel ratio obtained by the air-fuel ratio sensor A2. Then, the second error rate calculation unit 22 can calculate the second error rate by dividing the intake air amount estimated in this way by the sensor value (actual measurement value of the intake air amount) of the actual intake air amount sensor A0.

[0032] If it is determined in step S21 that the estimation accuracy is low (step S21: NO), the determination in step S21 is repeatedly performed at a predetermined time interval.

[0033] In the subsequent step, the second estimation unit 23 generates a fourth error rate by reflecting the currently calculated second error rate at a ratio less than 1 (for example, 50%) with respect to the previously calculated second error rate, which is the value read in step S1 (step S23: second estimation step). The fourth error rate is the second error rate updated based on the current sensor value of the air-fuel ratio sensor A2. Thereby, even if the currently calculated second error rate is a specific value, the influence of the specific value is mitigated.

[0034] Subsequently, the second estimation unit 23 generates (acquires) a second estimated amount, which is an estimated amount of the intake air amount in the second system, based on the current sensor value of the intake air amount sensor A0 and the second error rate (step S24: second estimation step). More specifically, the second estimation unit 23 obtains the second estimated amount by multiplying the fourth error rate (updated second error rate) generated based on the second error rate in step S23 by the sensor value of the intake air amount sensor A0. As described above, the estimation of the intake air amount based on the air-fuel ratio sensor A2 belonging to the second system is completed.

[0035] Subsequently, the correction value acquisition unit 30 obtains a correction value for the intake air amount by adding together the first estimated value, the second estimated value, and the sensor value of the current intake air amount sensor A0, while weighting each of them (step S2: correction value acquisition step). The weighting coefficients for the first estimated value, the second estimated value, and the intake air amount can be arbitrary within a range where their sum is 100%. For example, they can be 30%, 30%, and 40%, etc.

[0036] Thereafter, the correction device 1 determines whether the vehicle has been turned off (step S3). If it is determined that the vehicle has been turned off (step S3: YES), it stores each of the first error rate (i.e., the third error rate) updated in step S13 and the second error rate (i.e., the fourth error rate) updated in step S23, and ends the process. If, as a result of the determination in step S3, it is determined that the vehicle has not been turned off, a series of processes are repeatedly executed.

[0037] As described above, in the correction device 1 and the correction method according to the present embodiment, based on the sensor values of the intake air pressure sensor A1, which is a sensor different from the intake air amount sensor A0 and belongs to the first system, and the air-fuel ratio sensor A2, which is a sensor different from the intake air amount sensor A0 and belongs to the second system independent of the first system, the intake air amount is separately estimated, and the first error rate and the second error rate, which are the error rates between the estimated intake air amount and the sensor value of the intake air amount sensor A0, are calculated.

[0038] Also, based on the first error rate and the sensor value of the intake air amount sensor A0, a first estimated value, which is an estimated value of the intake air amount, is obtained, and based on the second error rate and the sensor value of the intake air amount sensor A0, a second estimated value, which is an estimated value of the intake air amount, is obtained. Then, a correction value for the intake air amount is obtained by adding together the sensor value of the intake air amount sensor A0, the first estimated value, and the second estimated value, while weighting each of them.

[0039] In this way, an error rate is calculated based on each of the sensor values of at least two independent systems of sensors, and a correction value for the intake air amount of the intake air amount sensor A0 is obtained based on the error rate, so that the errors of the respective sensors are averaged and a correction value closer to the actual value can be obtained. Therefore, according to the correction device 1 and the correction method according to the present embodiment, more appropriate correction of the intake air amount sensor A0 is possible.

[0040] FIG. 3 is a table showing the calculation results of the error rate under various conditions. Nos. 1 to 3 in FIG. 3 show the results of the conventional case where the error is calculated based only on the sensor value of one system of sensors (air-fuel ratio sensor), and Nos. 4 to 10 show the results of the case where the error is calculated based on the sensor values of two systems of sensors (air-fuel ratio sensor and intake air pressure sensor).

[0041] As shown in the results of Nos. 1 to 3, in the conventional case, when the error rate of the air-fuel ratio sensor is 0% (Nos. 1 and 2), since the reflection rate of the air-fuel ratio sensor is 100%, regardless of the error rate of the intake air amount sensor, the calculated error rate is also 0%. On the other hand, when the error rate of the air-fuel ratio sensor is 5%, even if the error rate of the intake air amount sensor is 0%, an error rate of 5% is calculated. That is, in this case, an error rate larger than the error rate of the intake air amount sensor is calculated.

[0042] On the other hand, as shown in the results of Nos. 4 to 4, when the error rate is calculated based on each of the sensor values of two systems of sensors and the reflection rate (weighting coefficient) of each error rate is 30% (here, the reflection rate of the error rate of the intake air amount sensor is 40%), on average, an error rate lower than the maximum error rate of 5% is calculated. On the other hand, even in the worst case where all sensors uniformly include an error of 5%, the error rate does not exceed 5%. Therefore, by repeatedly calculating and updating the error rate, a more appropriate correction value can be obtained.

[0043] Further, in the correction device 1 according to the present embodiment, the first estimation unit 13 generates a third error rate by reflecting the currently calculated first error rate at a ratio less than 1 with respect to the previously calculated first error rate, and obtains a first estimated value by multiplying the third error rate by the sensor value of the intake air amount sensor A0. Further, the second estimation unit 23 generates a fourth error rate by reflecting the currently calculated second error rate at a ratio less than 1 with respect to the previously calculated second error rate, and obtains a second estimated value by multiplying the fourth error rate by the sensor value of the intake air amount sensor A0. Thereby, even when a specific value is calculated in a certain calculation of the error rate, the influence of the specific error rate is mitigated.

[0044] Further, the correction device 1 according to the present embodiment includes a first determination unit 11 that determines whether or not the estimation accuracy of the intake air amount in the first error rate calculation unit 12 is high, and a second determination unit 21 that determines whether or not the estimation accuracy of the intake air amount in the second error rate calculation unit 22 is high. Then, when the first determination unit 11 determines that the estimation accuracy of the intake air amount is high, the first error rate calculation unit 12 performs estimation of the intake air amount and calculation of the first error rate, and when the second determination unit 21 determines that the estimation accuracy of the intake air amount is high, the second error rate calculation unit 22 performs estimation of the intake air amount and calculation of the second error rate. In this way, by calculating the error rate in a state where the estimation accuracy is high, it is possible to reduce noise.

[0045] Furthermore, the correction device 1 and the correction method according to the present embodiment are applied to an engine mounted on a vehicle. Therefore, it is possible to perform more appropriate correction of the intake air amount sensor A0 of the engine. As a result, it is possible to appropriately perform exhaust gas purification processing and the like based on the appropriate intake air amount.

[0046] The above embodiments describe one aspect of the correction device and the correction method according to the present invention. Therefore, the correction device and the correction method according to the present invention are not limited to the above embodiments and can be arbitrarily modified.

[0047] For example, in the above embodiment, an example in which the correction device and the correction method according to the present invention are applied to an engine mounted on a vehicle has been described. However, the correction device and the correction method according to the present invention can be applied to any device that receives the introduction of air, such as a fuel cell.

[0048] Further, in the above embodiment, an example of using two independent systems of sensors has been described. However, in the correction device and the correction method according to the present invention, three or more independent systems of sensors may be used.

[0049] Also, in the correction device 1, the first determination unit 11 and the second determination unit 21 are not essential, and it is not essential for the first estimation unit 13 and the second estimation unit 23 to obtain the third error rate and the fourth error rate by reflecting the current first error rate and second error rate at a certain ratio with respect to the previous first error rate and second error rate.

Explanation of Reference Numerals

[0050] 1... correction device, 11... first determination unit, 12... first error rate calculation unit, 13... first estimation unit, 21... second determination unit, 22... second error rate calculation unit, 23... second estimation unit, 30... correction value acquisition unit, A0... intake air amount sensor (introduction amount sensor), A1... intake air pressure sensor (first sensor), A2... air-fuel ratio sensor (second sensor).

Claims

1. A correction device for correcting an introduction amount sensor that obtains an air introduction amount in a device that receives air introduction, comprising: a first error rate calculation unit that is a sensor different from the introduction amount sensor, estimates the air introduction amount based on a sensor value of a first sensor belonging to a first system, and calculates a first error rate that is an error rate between the estimated air introduction amount and the sensor value of the introduction amount sensor; a first estimation unit that obtains a first estimated amount that is an estimated amount of the air introduction amount based on the sensor value of the introduction amount sensor and the first error rate; a second error rate calculation unit that is a sensor different from the introduction amount sensor, estimates the air introduction amount based on a sensor value of a second sensor belonging to a second system independent of the first system, and calculates a second error rate that is an error rate between the estimated air introduction amount and the sensor value of the introduction amount sensor; a second estimation unit that obtains a second estimated amount that is an estimated amount of the air introduction amount based on the sensor value of the introduction amount sensor and the second error rate; a correction value acquisition unit that obtains a correction value of the air introduction amount by adding the sensor value of the introduction amount sensor, the first estimated amount, and the second estimated amount while weighting each of them; A correction device comprising the above.

2. The first estimation unit generates a third error rate by reflecting the currently calculated first error rate at a ratio less than 1 with respect to the previously calculated first error rate, and multiplies the third error rate by the sensor value of the introduction amount sensor to obtain the first estimated amount. The second estimation unit generates a fourth error rate by reflecting the currently calculated second error rate at a ratio less than 1 with respect to the previously calculated second error rate, and multiplies the fourth error rate by the sensor value of the introduction amount sensor to obtain the second estimated amount. The correction device according to Claim 1.

3. A first determination unit that determines whether or not the estimation accuracy of the air introduction amount in the first error rate calculation unit is high; A second determination unit that determines whether or not the estimation accuracy of the air introduction amount in the second error rate calculation unit is high; Comprising: When the first determination unit determines that the estimation accuracy of the air introduction amount is high, the first error rate calculation unit estimates the air introduction amount and calculates the first error rate. When the second determination unit determines that the estimation accuracy of the air introduction amount is high, the second error rate calculation unit estimates the air introduction amount and calculates the second error rate. The correction device according to Claim 1.

4. The device is an engine mounted on a vehicle, The air introduction amount is the intake air amount of the engine, The introduction amount sensor is an intake air amount sensor that acquires the intake air amount in the engine, The correction device according to any one of claims 1 to 3.

5. A correction method for correcting an introduction amount sensor that acquires an air introduction amount in a device that receives air introduction, A first error rate calculation step of estimating the air introduction amount based on a sensor value of a first sensor belonging to a first system, which is a sensor different from the introduction amount sensor, and calculating a first error rate, which is an error rate between the estimated air introduction amount and the sensor value of the introduction amount sensor; A first estimation step of obtaining a first estimated amount, which is an estimated amount of the air introduction amount, based on the sensor value of the introduction amount sensor and the first error rate after the first error rate calculation step; A second error rate calculation step of estimating the air introduction amount based on a sensor value of a second sensor belonging to a second system independent of the first system, which is a sensor different from the introduction amount sensor, and calculating a second error rate, which is an error rate between the estimated air introduction amount and the sensor value of the introduction amount sensor; A second estimation step of obtaining a second estimated amount, which is an estimated amount of the air introduction amount, based on the sensor value of the introduction amount sensor and the second error rate after the second error rate calculation step; A correction value acquisition step of obtaining a correction value of the air introduction amount by adding up each of the sensor value of the introduction amount sensor, the first estimated amount, and the second estimated amount while weighting them after the first estimation step and the second estimation step; A correction method comprising the above steps.

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