JP2010209696A - Control device and control method of internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a control device improving knocking determination accuracy and accurately controlling an internal combustion engine by avoiding knocking false detection caused by operation lag of functional components of an air conditioner compressor and the like mounted on an internal combustion engine and driven by the internal combustion engine. <P>SOLUTION: The control device of the internal combustion engine includes a knocking control section 1A performing knocking determination based on a signal in a knocking detection window in an output signal of a knocking sensor 2 detecting vibration of the internal combustion engine and controlling the internal combustion engine according to a result of the knocking determination, and a drive control section 1B outputting a drive signal for controlling operation of the functional components of the air conditioner compressor 32 and the like mounted on the internal combustion engine and driven by the internal combustion engine. The drive control section 1B includes a timing correction section 21 setting output timing of the drive signal within a period in which there is no vibration noise generated by the functional components in the knocking detection window. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a control device and a control method for an internal combustion engine that determines whether or not the internal combustion engine is knocked based on an output signal of a knock sensor and controls ignition timing of the internal combustion engine.

  Conventionally, as a control device for this type of internal combustion engine, for example, as described in Patent Document 1, vibration noise generated by the operation of an injector in a direct injection internal combustion engine is applied to a knock sensor signal in a knock detection period. In order to avoid this, by changing the knock determination period and setting the fuel injection timing according to the knock determination period when the change in the knock determination period becomes unacceptable anymore, the accuracy of the knock determination is reduced. Something to suppress has been proposed.

JP 2004-251218 A

Noise generated by the operation of the injector as in the conventional example (vibration such as a hitting sound when the nozzle needle is seated on the valve seat at the end of fuel injection of the injector) is output from the control device of the internal combustion engine It is assumed that noise is generated at approximately the same time as the operation timing.
However, when a vibration (hereinafter referred to as electromagnetic clutch operation noise) generated when an electromagnetic clutch for connecting and disconnecting power to an air conditioner compressor mounted on and driven by the internal combustion engine is engaged and operated on the knock sensor output, the internal combustion engine. The air conditioner compressor drive signal output from the control device of the internal combustion engine is coupled via the electromagnetic relay until the air conditioner compressor drive signal output from the control device is output and the electromagnetic clutch is connected. Is connected to the clutch to have a certain amount of time (the operation delay of the electromagnetic relay and the operation delay of the electromagnetic clutch).
For this reason, even if the compressor drive signal for an air conditioner is turned ON at a timing outside the knock detection window, the timing at which the electromagnetic clutch is engaged is delayed by the operation delay time of the electromagnetic relay and the operation delay time of the electromagnetic clutch. There is a possibility that electromagnetic clutch operating noise enters the window, and knocking erroneous detection is caused by the noise.

  The present invention has been made in view of the above problems, and occurs with a certain delay time due to an operation delay of a functional component such as an air conditioner compressor mounted on and driven by the internal combustion engine. An object of the present invention is to provide a control device and a control method for an internal combustion engine that can improve knock determination accuracy and accurately control the internal combustion engine by avoiding erroneous knock detection due to the noise.

  The present invention performs a knock determination based on a signal within a knock detection window in an output signal of a knock sensor that detects vibration of the internal combustion engine, and controls the internal combustion engine according to the knock determination result; and the internal combustion engine An internal combustion engine control device comprising: a drive control unit that outputs a drive signal that controls the operation of a functional component that is mounted on the engine and driven by the internal combustion engine; and the drive control unit includes an operation delay time of the functional component And a timing correction unit that sets the output timing of the drive signal within a period in which vibration noise generated by the functional component does not enter the knock detection window.

  Further, the present invention performs knock determination based on a signal within a knock detection window in an output signal of a knock sensor that detects vibration of the internal combustion engine, controls the internal combustion engine according to the knock determination result, and controls the internal combustion engine. In the control method of an internal combustion engine for outputting a drive signal for controlling the operation of the functional component mounted on the internal combustion engine, the output timing of the drive signal is determined according to the operation delay time of the functional component. It is set within a period in which vibration noise generated by the functional component does not enter the detection window.

  According to the present invention, even when noise with a certain delay time occurs with respect to the drive signal output of a functional component serving as a noise source, such as an air conditioner compressor, the noise generation timing is outside the knock detection window. By doing so, it is possible to avoid erroneous detection of knock due to the noise, to improve knock determination accuracy, and to accurately control the internal combustion engine.

It is a block diagram which shows the control apparatus of the conventional internal combustion engine. It is a time chart which shows the time of knocking misdetection by electromagnetic clutch operation noise. It is a time chart which shows the avoidance control of the electromagnetic clutch operation noise which concerns on Embodiment 1 of this invention. 1 is a block diagram showing a control device for an internal combustion engine according to Embodiment 1 of the present invention. FIG. It is a flowchart which shows the interruption process implemented at the timing of BTDC10 degreeCA which concerns on Embodiment 1 of this invention. It is a flowchart which shows the process which learns the compressor operation | movement delay time for the air conditioner which concerns on Embodiment 1 of this invention. It is a block diagram which shows the control apparatus of the internal combustion engine which concerns on Embodiment 2 of this invention. It is a flowchart which shows the process of knock determination prohibition and knock retard amount holding | maintenance for the predetermined period which concerns on Embodiment 2 of this invention.

Embodiment 1 FIG.
First, conventional knock control and air conditioning control will be described with reference to FIG. FIG. 1 is a block diagram showing a conventional control device 1 for an internal combustion engine. The control device 1 performs knock determination of the internal combustion engine, and operates a knock control unit 1A that controls the internal combustion engine according to the knock determination result, and an operation of an air conditioner compressor that is mounted on the internal combustion engine and driven by the internal combustion engine. And a drive control unit 1B that outputs a drive signal to be controlled. A knock sensor 2, a crank angle sensor 3, a cam angle sensor 4, and an air conditioner SW (switch) 27 are connected to the input side, and an igniter is connected to the output side. 19 and an electromagnetic relay 31 are connected.
An ignition coil 28 is connected to the igniter 19, and a spark plug 29 is connected to the ignition coil 28. An air conditioner compressor 32 is connected to the electromagnetic relay 31.

  Knock sensor 2 connected to knock control unit 1A is attached to a cylinder block of an internal combustion engine (not shown), detects vibration generated in the internal combustion engine, and outputs a vibration detection signal (knock signal) corresponding to the vibration level. . The crank angle sensor 3 outputs a pulse signal corresponding to the rotational speed (operating state) of the internal combustion engine. The igniter 19 energizes the ignition coil 28 by the ignition signal 30 calculated and output by the control device 1. The ignition coil 28 supplies a high voltage to the spark plug 29, and the spark plug 29 ignites the air-fuel mixture supplied to the combustion chamber (not shown) of the internal combustion engine.

  The air conditioner SW27 outputs the air conditioner SW signal 23 to the drive control unit 1B of the control device 1. When the air conditioner signal 23 is turned ON, the air conditioner control section 20 of the drive control section 1B makes an air conditioner ON / OFF determination based on the operation state (rotation, throttle opening, etc.) of the internal combustion engine, and the compressor drive signal 25 for the air conditioner is electromagnetically transmitted. Output to relay 31. When the electromagnetic relay 31 is turned on, the electromagnetic clutch attached to the air conditioner compressor 32 is connected and the air conditioner compressor 32 is driven.

  Knock control unit 1 </ b> A includes a low-pass filter 6, an amplifier circuit 7, and a microcomputer 5. The microcomputer 5 includes a gain switching determination unit 8, an A / D (analog to digital) conversion unit 10, a digital bandpass filter 11, a peak hold unit 12, a knock detection window setting unit 13, and a knock determination threshold calculation unit. 15, a knock detection amount calculation unit 16, a knock correction angle calculation unit 17, an ignition timing correction unit 18, and an air conditioner control unit 20. The microcomputer 5 is composed of a CPU and a memory storing a program, and each block constituting the microcomputer 5 is stored as software in the memory.

  In the knock control unit 1A, in order to prevent aliasing when the signal from the knock sensor 2 is connected to the low-pass filter 6 and is processed by the digital band-pass filter in the microcomputer 5 by the low-pass filter 6, A component (eg, 25 kHz or more) is attenuated. Next, the amplifier circuit 7 amplifies the signal based on the gain switching signal 9 from the microcomputer 5. The amplification gain of the amplifier circuit 7 is determined by the gain switching signal 9 output from the gain switching determination unit 8 according to the operating condition of the internal combustion engine so that the knock sensor output signal input to the microcomputer 5 is within an appropriate range. , Switched appropriately.

  After that, A / D conversion is performed by the A / D conversion unit 10 in the microcomputer 5, and a specific frequency signal component output when a knock occurs is extracted by the digital band pass filter 11. The knock detection window setting unit 13 opens and closes the knock detection window synchronized with the rotation signal from the crank angle sensor 3 attached to the internal combustion engine (open: start of peak hold of the knock sensor signal, close: end of peak hold of the knock sensor signal) ) The time is calculated, and the knock detection window signal 14 is output. The peak hold unit 12 holds the peak value of the output signal from the digital bandpass filter 11 during the knock detection window period, and the peak value (in FIG. 3) in the knock detection window period is set as the knock peak hold value Vp. Used for calculation of knock detection. The peak hold calculation is not performed from the knock detection window closing timing to the next knock detection window opening timing.

The knock determination threshold calculation unit 15 averages the knock peak hold value Vp and calculates the background level. The background level is calculated as shown in the following equation (1), for example.
BGL = (1−k) × BGL [i−1] + k × Vp (1)
BGL: Background level
k: Background level reflection factor
BGL [i-1]: Previous value of background level Next, the knock determination threshold Vth is used to amplify the background level calculated by equation (1) and add the offset to detect the presence or absence of knocking. It calculates by following Formula (2).
Vth = BGL × Kth + Vofs (2)
Kth: Threshold coefficient
Vofs: Threshold offset

The knock detection amount Vk is calculated by the following equation (3) from the knock peak hold value Vp and the knock discrimination threshold Vth calculated by the equation (2) by the knock detection amount calculation unit 16 to determine whether the internal combustion engine is knocked or not. To detect.
Vk = Vp−Vth (3)
In Equation (3), when the knock detection amount Vk is larger than “0” (> 0), it indicates that a knock has occurred, and the knock detection amount Vk is “0” or less (≦ 0). The case shows a state where no knock has occurred.

The knock correction angle calculation unit 17 first calculates a knock retard amount ΔΘR to retard control the ignition timing when the knock detection amount calculation unit 16 detects the occurrence of a knock. The knock retard amount ΔΘR is expressed by the following equation (4).
ΔΘR = Vk ÷ Vth × Kg (4)
Kg: Reflection coefficient of knock retard amount When the occurrence of knock is not detected, the knock correction angle calculation unit 17 sets the knock retard amount ΔΘR to “0”. Subsequently, the final knock retard amount ΘR is calculated based on the knock retard amount ΔΘR. The final knock retard amount ΘR is expressed by the following equation (5).
ΘR = ΘR [i-1] + ΔΘR-Ka (t) (5)
Ka: Lead angle return constant
ΘR [i−1]: Previous value of final knock retard amount ΘR Here, when the occurrence of knock is not detected, knock retard amount ΔΘR is set to “0”, so final knock retard amount ΘR is It decreases at a predetermined speed (Ka).
Next, the ignition timing correction unit 18 outputs a drive signal (ignition signal) for the igniter 19 based on the final knock retard amount ΘR.

  On the other hand, in the drive control unit 1B, the air conditioner control unit 20 receives the air conditioner SW signal 23 output from the air conditioner SW27, outputs an air conditioner compressor drive signal 25 according to the state of the internal combustion engine, and sets the electromagnetic relay 31. The compressor 32 for an air conditioner is driven through.

  The air conditioner compressor 32 is attached to a cylinder block of the internal combustion engine, and power is transmitted from the crankshaft of the internal combustion engine via a belt. The power is intermittently connected to the air conditioner compressor 32 by an electromagnetic clutch assembled to the air conditioner compressor 32. The vibration generated when the electromagnetic clutch is engaged is transmitted to the knock sensor 2 attached to the cylinder block, and the electromagnetic clutch operating noise is superimposed on the knock sensor signal.

  FIG. 2 is a time chart for explaining a situation in which electromagnetic clutch operation noise is generated in a knock detection window and knocking is erroneously detected in a four-cylinder internal combustion engine. The air conditioner compressor 32 is driven by an operation delay time of the electromagnetic relay 31 and an operation delay time Td required from when energization to the excitation coil of the electromagnetic clutch is started until the electromagnetic clutch is engaged. In the figure, after the operation delay time Td after the air conditioner compressor drive signal 25 output from the air conditioner control unit 20 is turned ON, within the knock detection window of the third cylinder (BTDC 10 ° CA (top dead center as an example in FIG. 2). The electromagnetic clutch operating noise is superimposed on the knock sensor signal Vbpf from the front 10 ° crank angle) to ATDC 50 ° CA (set to 50 ° crank angle after top dead center). At this time, the knock peak hold value Vp becomes a very large value in order to detect electromagnetic clutch operation noise, and the knock determination threshold Vth is exceeded and erroneous determination is made that knocking occurs, resulting in erroneous retard of the ignition timing.

  FIG. 3 is a time chart showing an example of electromagnetic clutch operating noise avoidance control according to the present invention. In the drive control unit 1B, the air conditioner compressor drive signal 26a output from the air conditioner control unit 20 changes from OFF to ON, but immediately does not drive the air conditioner compressor 32, and the next BTDC 10 ° CA (in this example, the first 1 cylinder) including the time corresponding to the aforementioned operation delay time Td until the air conditioner compressor drive signal 26b is turned on from BTDC 10 ° CA so that electromagnetic clutch operation noise is generated at ATDC 110 ° CA outside the knock detection window. The waiting time Ta is calculated, and an air conditioner compressor drive signal 26b is output after Ta time from BTDC 10 ° CA. When the air conditioner compressor drive signal 26b is turned ON, the air conditioner compressor 32 is driven. As a result, electromagnetic clutch operation noise is generated in the vicinity of the target ATDC 110 ° CA and is outside the knock detection window and is not reflected in the knock peak hold value Vp, so that erroneous knock detection can be avoided.

  Further, learning of the operation delay time Td is carried out in order to correct an error caused by variations in electromagnetic relays and electromagnetic clutches of the operation delay time Td. The elapsed time is counted by the delay time measurement counter Cd from the time when the air conditioner compressor drive signal 26b is turned ON. When the knock sensor signal Vbpf exceeding the electromagnetic clutch actuation noise discrimination threshold Vnth previously adapted by the actual machine is confirmed, the learning is completed with the value of the delay time measurement counter Cd of the timing as the operation delay time Td.

  FIG. 4 is a block diagram showing a control device according to the first embodiment including the above-described electromagnetic clutch operation noise avoidance control. 4 has an air conditioner compressor ON timing correction unit 21 in the drive control unit 1B and an air conditioner electromagnetic clutch operation delay time learning unit 22 in the knock control unit 1A. .

  The block diagram of FIG. 4 will be described. In the air conditioner electromagnetic clutch operation delay time learning unit 22 of the knock control unit 1A, the signal Vbpf from the digital bandpass filter 11 is compared with the electromagnetic clutch operation noise determination threshold Vnth. If the level of the electromagnetic clutch operation noise is large, the electromagnetic clutch operation is performed. Judgment is made as noise, and the electromagnetic clutch operation delay time is calculated and learned. When the air conditioner compressor drive signal 26a is turned ON, the air conditioner compressor ON timing correction unit 21 uses the air conditioner compressor after the standby time Ta calculated from the operation delay time Td learned by the electromagnetic clutch operation delay time learning unit 22 elapses. The compressor drive signal 26 b is output to drive the air conditioner compressor 32 via the electromagnetic relay 31.

When the operation delay time is not learned, the knock correction angle calculation unit 17 receives the knock determination prohibition signal 24 from the air conditioner electromagnetic clutch operation delay time learning unit 22, and the air conditioner compressor drive signal 26b is turned on for a predetermined period. The accumulation of the final knock retard amount ΘR is prohibited for (the longest time required for the electromagnetic clutch operation noise to converge from the time when the air conditioner compressor drive signal 26b is turned on, which is assumed to include variations in individual electromagnetic relays and electromagnetic clutches). (ΔΘR = 0), that is, knock determination is prohibited, and the final knock retard amount ΘR is held at a value immediately before the knock determination is prohibited. (Alternatively, the final knock retard amount ΘR may be gradually decreased during the knock determination prohibition period.)
When the air conditioner compressor drive is stopped (ON → OFF), the air conditioner compressor ON timing correction unit 21 does not perform the processing operation and sets the air conditioner compressor drive signal 26a = the air conditioner compressor drive signal 26b.

FIG. 5 shows a flowchart of interrupt processing executed at the timing of BTDC 10 ° CA. First, in step 101, it is determined whether or not the air conditioner compressor drive signal 26a is ON. If it is ON, in step 102, the air conditioner compressor drive signal 26a may be changed from OFF to ON in the current BTDC 10 ° CA interrupt processing routine. If so, go to Step 103. In step 103, it is determined whether learning of the air conditioner electromagnetic clutch operation delay time Td has been completed (Td ≠ 0: initial value). If Td learning has been completed, the process proceeds to step 104, and in step 104, the BTDC 10 at that time The time Tt from ° CA to ATDC110 ° CA and the time Tc from the next cylinder to BTDC10 ° CA (time of 180 ° CA interval) are calculated from the rotational speed of the internal combustion engine at the time of the request by the following equation (6): Calculate from (7).
Tt = (120/360) × (60 / Ne) (6)
Tc = (180/360) × (60 / Ne) (7)
Ne: Rotational speed of the internal combustion engine

Next, in step 105, the operation delay time Td is compared with the Tt obtained by the equation (6). If Td is larger, the process proceeds to step 108, and the time until the next cylinder ATDC 110 ° CA is set to Tt. Thus, it is obtained from the following equation (8).
Tt = Tt + Tc (8)
When the time Tt becomes larger than Td in step 105, Td is subtracted from Tt in step 106 to obtain the waiting time Ta after BTDC 10 ° CA, and in step 107, the operation delay time Td learning 0.1 ms routine (FIG. 6) is permitted, and the BTDC 10 ° CA interrupt processing is terminated. Here, the standby time timer Ta is a timer that subtracts at a predetermined time period.
After the air conditioner compressor drive signal 26a is turned on as described above, the standby time Ta is calculated from the operation delay time Td, the standby time timer Ta is set, and when Ta = 0, the air conditioner compressor drive signal 26b is set. By turning ON, electromagnetic clutch operating noise is generated after the operation delay time Td (around ATDC 110 ° CA) after the air conditioner compressor drive signal 26b is turned ON. As a result, electromagnetic clutch operating noise is generated outside the knock detection window, so that erroneous knock detection can be avoided.

Further, in order to prevent the operation delay time Td learning 0.1 ms routine processing from being executed except during learning, when the air conditioner compressor drive signal 26 a is OFF in step 101, the operation delay time Td learning 0.1 ms routine is executed in step 113. Disable and end BTDC10 ° CA interrupt processing.
If it is determined in step 102 that the air conditioner compressor drive signal 26a is ON during the previous BTDC 10 ° CA interrupt processing, the process proceeds to step 111. If the air conditioner compressor drive signal 26b is ON in step 111, the process proceeds to step 112. move on. If Cd ≠ 0 (during Td learning) in step 112, the BTDC 10 ° CA interrupt processing is terminated as it is. If Cd = 0 in step 112 (other than Td learning), the operation delay time Td learning 0.1 ms routine is prohibited in step 113 and the BTDC 10 ° CA interrupt processing is terminated. If the air conditioner compressor drive signal 26b is OFF in step 111, the BTDC 10 ° CA interrupt process is terminated as it is.

If the operation delay time Td learning is not completed in step 103, the predetermined period time knock determination is prohibited (ΔΘR = 0) in step 109, and the final knock retard amount ΘR immediately before the knock determination is prohibited is held (Ka = 0). Next, in step 110, Ta = 0 is set, and in step 107, the delay time Td learning 0.1 ms routine is permitted, and the BTDC 10 ° CA interrupt processing is terminated.
In this way, even when the operation delay time Td cannot be accurately set due to individual variations of the electromagnetic relay or the electromagnetic clutch when the learning of the operation delay time Td is not completed, the knock determination is prohibited for a predetermined period, By avoiding erroneous retard due to electromagnetic clutch operating noise occurring within the knock detection window, and further holding the knock control retard amount (final knock retard amount ΘR), the occurrence of knocking during the knock determination prohibition period is suppressed. be able to.

  In order to obtain the waiting time Ta, an operation delay time Td is necessary. The Td is provided with a delay time measurement counter Cd and learning by actual measurement is performed. FIG. 6 shows a flowchart of a 0.1 ms routine for performing the delay time Td learning. During this learning, in order to accurately determine the vibration of the electromagnetic clutch, the vibration level of the internal combustion engine is low (low rotation range) and no knock is generated (low load range) (operation delay time Td learning execution condition). There is a need to do. Therefore, when Ta = 0 in step 121, it is determined in step 122 whether or not the above-mentioned operation delay time Td learning execution condition is satisfied. In step 123, when the air-conditioner compressor drive signal 26b is OFF, the air-conditioner compressor drive signal 26b is turned ON in step 129. In step 130, the delay time measurement is started with Cd = 0.1 ms, and return processing is performed.

  In order to measure the time from when the air conditioner compressor drive signal 26b is turned OFF to ON at step 123 until the knock sensor signal (after filtering) Vbpf exceeds the electromagnetic clutch operation noise determination threshold Vnth, the air conditioner compressor drive signal 26b is It is determined whether the air conditioner compressor drive signal 26b is ON. Next, in step 124, when Cd ≠ 0, the routine proceeds to step 125. If knock sensor signal Vbpf> Vnth is not satisfied, 0.1 ms is added to Cd in step 128, and return processing is performed. If Vbpf> Vnth in step 125, Td = Cd is set in step 126, Cd = 0 is initialized in step 127, and return processing is performed.

If Ta = 0 is not satisfied in step 121, the process proceeds to step 131 where Cd = 0 and return processing is performed. If the operation delay time Td learning execution condition is not satisfied in step 122, return processing is performed with Cd = 0 in step 131 to prohibit Td learning.
In this way, the air conditioner compressor operation delay time Td can be learned, and electromagnetic clutch operating noise can be avoided with high accuracy, including individual variations of electromagnetic relays and electromagnetic clutches.

Embodiment 2. FIG.
In the first embodiment, the air conditioner compressor operation delay time is learned, the ON timing of the air conditioner drive signal is controlled based on the result, and the electromagnetic clutch operating noise is prevented from entering the knock detection window. If the learning of the air conditioner compressor operation delay time is not performed, knock determination is prohibited for a predetermined period after the air conditioner drive signal is turned on, and electromagnetic clutch operating noise is detected. By avoiding erroneous retard due to erroneous knock detection, and maintaining the amount of knock control retard immediately before the knock determination prohibition during the knock determination prohibition period, the occurrence of knock is suppressed.
On the other hand, in the second embodiment, learning and control of the ON timing of the air conditioner drive signal are not performed, knock determination is always prohibited for a predetermined period after the air conditioner drive signal is turned ON, and the knock control retard amount is further reduced. By holding this, the false detection of electromagnetic clutch operating noise is avoided. The second embodiment will be described with a focus on differences from the first embodiment.

FIG. 7 shows the configuration of the control device for an internal combustion engine shown in the second embodiment. Compared to FIG. 1 showing the conventional example, a knock determination mask time calculation unit 33 is added to the knock control unit 1A, and the compressor drive signal 25 for the air conditioner output from the air conditioner control unit 20 branches to knock determination mask time calculation unit 33.
When the air conditioner compressor drive signal 25 is output from the air conditioner control unit 20 of the drive control unit 1B, the knock determination mask time calculation unit 33 is assumed to include a predetermined time Tm (including individual variations of electromagnetic relays and electromagnetic clutches). When the air conditioner compressor drive signal 25 is turned on, the knock determination prohibition signal 24 is output for the longest time required until the electromagnetic clutch operating noise converges. Knock determination prohibition signal 24 is received by knock correction angle calculation unit 17, knock determination is prohibited (ΔΘR = 0) for a predetermined period Tm after air conditioner compressor drive signal 25 is turned ON, and final knock retard amount ΘR is determined by knock determination. The value immediately before the prohibition is held (Ka = 0). (Alternatively, the final knock retard amount ΘR may be gradually decreased during the knock determination prohibition period.)

FIG. 8 is a flowchart showing the processing of the second embodiment. First, in step 201, it is determined whether the air conditioner compressor drive signal 25 is ON. If the air conditioner compressor drive signal 25 is ON, the process proceeds to step 202. Next, in step 202, it is determined whether or not the air conditioner compressor drive signal 25 is changed from OFF to ON in the current processing routine. If the air conditioner compressor drive signal 25 is changed from OFF to ON this time, the process proceeds to step 203. In step 203, knock determination mask time timer T is set to Tm. Here, the knock determination mask time timer T is a timer that subtracts at a predetermined time period.
During the period from when the predetermined time Tm is set to the knock determination mask time timer T until T = 0 (period T ≠ 0), the knock determination is prohibited (ΔΘR = 0) and the final knock retard amount ΘR is maintained ( Ka = 0).
In step 201, when the air conditioner compressor drive signal 25 is OFF, the processing is ended as it is.
If it is determined in step 202 that the air conditioner compressor drive signal 25 has been ON since the previous routine processing, the processing is terminated as it is.
In this manner, by prohibiting knock determination for a predetermined time after the air conditioner compressor drive signal 25 is turned ON, erroneous retard due to erroneous detection of electromagnetic clutch operating noise can be prevented, and during the knock determination prohibition period, knocking is prevented. By maintaining the control retard amount at a value immediately before the knock determination prohibition, the occurrence of knocking during the knock determination prohibition period can be suppressed.

  The present invention is not limited to the noise at the time of driving the air conditioner compressor described in each of the above embodiments, but occurs when other functional parts mounted on the internal combustion engine and driven by the internal combustion engine are operated. Needless to say, the present invention can also be applied to the case where there is a certain delay time between the drive signal output timing and the noise generation timing of the functional component serving as the noise generation source, as in the above embodiment.

DESCRIPTION OF SYMBOLS 1 Control apparatus for internal combustion engines, 1A knock control part, 1B drive control part, 2 knock sensor, 3 crank angle sensor, 4 cam angle sensor, 5 microcomputer, 6 low-pass filter, 7 amplification circuit, 8 gain switching determination part, 9 gain Switching signal, 10
A / D converter, 11 digital bandpass filter, 12 peak hold unit,
13 knock detection window setting section, 14 knock detection window signal, 15 knock discrimination threshold calculation section, 16 knock detection amount calculation section, 17 knock correction angle calculation section, 18 ignition timing correction section, 19 igniter, 20 air conditioner control section, 21
Air conditioner compressor ON timing correction unit, 22 Air conditioner electromagnetic clutch operation delay time learning unit, 23 Air conditioner SW signal, 24 Knock determination prohibition signal, 26a
Air conditioner compressor drive signal, 26b Air conditioner compressor drive signal, 27 Air conditioner SW, 28 Ignition coil, 29 Spark plug, 30 Ignition signal, 31 Electromagnetic relay, 32 Air conditioner compressor, 33 Knock determination mask time calculation unit

Claims (12)

A knock control unit that performs knock determination based on a signal within a knock detection window in an output signal of a knock sensor that detects vibration of the internal combustion engine and controls the internal combustion engine according to the knock determination result, and is mounted on the internal combustion engine A control device for an internal combustion engine, comprising: a drive control unit that outputs a drive signal for controlling the operation of a functional component driven by the internal combustion engine;
The drive control unit sets the output timing of the drive signal in a period in which vibration noise generated by the functional component does not enter the knock detection window according to the operation delay time of the functional component. A control apparatus for an internal combustion engine, comprising:   The knock control unit includes an operation delay time learning unit that measures an operation delay time of the functional component during operation of the internal combustion engine and stores the measurement result as a learning value of the operation delay time of the functional component, 2. The control apparatus for an internal combustion engine according to claim 1, wherein the timing correction unit sets the output timing of the drive signal using the learning value.   The operation delay time learning unit learns the operation delay time of the functional component measured under the operating conditions of the internal combustion engine in a low rotation side and a low load region where the vibration noise level of the internal combustion engine is low and knock does not occur. 3. The control device for an internal combustion engine according to claim 2, wherein the control device is stored as a value.   The knock control unit prohibits the knock determination for a predetermined period after the driving signal is output and performs retard control of the ignition timing of the internal combustion engine until learning by the operation delay time learning unit is completed. 4. The control apparatus for an internal combustion engine according to claim 2, further comprising means for maintaining the knock control retard amount at a value immediately before the knock determination prohibition or gradually decreasing the knock control retard amount. A knock control unit that performs knock determination based on a signal within a knock detection window in an output signal of a knock sensor that detects vibration of the internal combustion engine and controls the internal combustion engine according to the knock determination result, and is mounted on the internal combustion engine A control device for an internal combustion engine, comprising: a drive control unit that outputs a drive signal for controlling the operation of a functional component driven by the internal combustion engine;
The knock control unit prohibits the knock determination for a predetermined period after the drive signal is output, and holds the knock control retard amount for retarding the ignition timing of the internal combustion engine at a value immediately before the knock determination is prohibited. Or a control device for an internal combustion engine, characterized by comprising means for gradually decreasing the knock control retard amount.   6. The control apparatus for an internal combustion engine according to claim 1, wherein the functional component is an air conditioner compressor equipped with an electromagnetic clutch. A knock determination is made based on a signal within a knock detection window in an output signal of a knock sensor for detecting vibration of the internal combustion engine, the internal combustion engine is controlled according to the knock determination result, and the internal combustion engine is mounted on the internal combustion engine. In a control method for an internal combustion engine that outputs a drive signal for controlling the operation of a functional component driven by
An internal combustion engine characterized in that the output timing of the drive signal is set within a period in which vibration noise generated by the functional component does not enter the knock detection window in accordance with an operation delay time of the functional component. How to control the engine. A first step of measuring an operation delay time of the functional component during operation of the internal combustion engine, and storing the measurement result as a learning value of the operation delay time of the functional component;
The internal combustion engine control method according to claim 7, further comprising: a second step of setting an output timing of the drive signal using the learning value.   The first step is a learning value of an operation delay time of the functional component measured under an operating condition of the internal combustion engine in a low rotation side and a low load region where the vibration noise level of the internal combustion engine is low and knock does not occur. 9. The method of controlling an internal combustion engine according to claim 8, wherein   Until the learning of the operation delay time is completed, knock determination is prohibited for a predetermined period after the output of the drive signal, and knock control retard amount for retarding the ignition timing of the internal combustion engine is prohibited. The internal combustion engine control method according to claim 8 or 9, further comprising a third step of maintaining the previous value or gradually decreasing the knock control retard amount. A knock determination is made based on a signal within a knock detection window in an output signal of a knock sensor for detecting vibration of the internal combustion engine, the internal combustion engine is controlled according to the knock determination result, and the internal combustion engine is mounted on the internal combustion engine. In the control method of the internal combustion engine for controlling the operation of the functional component driven by
The knock determination is prohibited for a predetermined period after the drive signal is output, and the knock control retard amount for retarding the ignition timing of the internal combustion engine is held at a value immediately before the knock determination prohibition, or the knock control retard A method for controlling an internal combustion engine, comprising a step of gradually decreasing the amount.   The method for controlling an internal combustion engine according to any one of claims 7 to 11, wherein the functional component is an air conditioner compressor equipped with an electromagnetic clutch.