JP2018053866A - Internal combustion engine control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal combustion engine control device which can detect even abnormality other than short circuit of a detection system for detecting a representative temperature of an internal combustion engine and a temperature of a wall part that demarcates a combustion chamber of the internal combustion engine, can more exactly determine abnormality of a control system of the internal combustion engine including such a detection system and, at the same time, can make an operation state of the internal combustion engine appropriate, considering the operation state of the internal combustion engine with a simple constitution.SOLUTION: In an internal combustion engine control device 1, a control part 606 determines abnormality of a control system S of the internal combustion engine including a detection system for detecting a representative temperature of the internal combustion engine and a temperature of a wall part on the basis of the temperature of the wall part and the representative temperature in such a state that the control part determines the warming-up has been completed, determination of warming-up completion is performed on the basis of the representative temperature and a time-measuring time from starting time of the internal combustion engine measured by a representative temperature time-measuring part and, when it is determined that the operation state of the internal combustion engine is in such a state that heat quantity generated from the internal combustion engine is relatively less, the time-measuring time is retained or shortened.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an internal combustion engine control device, and more particularly to an internal combustion engine control device applied to an internal combustion engine of a vehicle such as a two-wheeled vehicle.

  Generally, a vehicle is provided with a plurality of temperature sensors, and each temperature sensor detects the temperature of a predetermined part of the vehicle. The temperature detected by the temperature sensor is used as a control parameter in the control of the internal combustion engine. For this reason, if an abnormality occurs in the temperature sensor, the control of the internal combustion engine cannot be appropriately performed due to an erroneous detection value from the temperature sensor, and the operating state of the internal combustion engine may be deteriorated.

  Under such circumstances, Patent Document 1 relates to a vehicle control device that detects an abnormality of a temperature sensor, and calculates a deviation between two temperatures among a plurality of temperatures detected by a plurality of temperature sensors. The structure which detects abnormality in a plurality of temperature sensors based on a certain deviation is disclosed.

JP 2003-286888 A

  However, according to the study of the present inventor, Patent Document 1 discloses and suggests that an abnormality of a wall temperature sensor that detects the temperature of a wall that defines a combustion chamber of an internal combustion engine is detected. Absent. In particular, a wall temperature sensor using a thermistor detects voltage sticking (high / low failure) due to a short circuit to the power supply voltage side (high side) or ground potential side (low side). When only high / low failure is detected, it is not possible to detect abnormal output at intermediate potential, such as endurance deterioration, corrosion, or short circuit to other harnesses. In addition, since the process shifts to ignition correction and internal combustion engine protection control based on the output of the wall temperature sensor, if the sensor output is incorrect, the operating state of the internal combustion engine may not be properly controlled.

  The present invention has been made through the above-described studies. With a simple configuration and taking into consideration the operating state of the internal combustion engine, the representative temperature of the internal combustion engine and the temperature of the wall that defines the combustion chamber of the internal combustion engine. It is also possible to detect an abnormality other than a short-circuit in the detection system that detects the abnormality, and to more accurately determine an abnormality in the control system of the internal combustion engine including the detection system. An object of the present invention is to provide an internal combustion engine control device that can be made appropriate.

  In order to achieve the above object, the present invention provides a control unit for controlling the operating state of the internal combustion engine based on the temperature of the wall portion defining the combustion chamber of the internal combustion engine and the representative temperature of the internal combustion engine. In the internal combustion engine control device, the control unit is configured to determine the representative temperature and the wall portion of the internal combustion engine based on the temperature and the representative temperature of the wall portion in a state where the warm-up completion of the internal combustion engine is determined. The control system of the internal combustion engine including the detection system for detecting the temperature of the internal combustion engine is determined to be abnormal, and the warm-up completion determination is timed from the start time of the internal combustion engine, which is measured by the representative temperature and the representative temperature measuring unit. When the internal combustion engine operating state is determined to be in an operating state in which the amount of heat generated by the internal combustion engine is relatively small, the time keeping time is maintained or shortened. First aspect To.

  According to the present invention, in addition to the first aspect, the control unit determines that the representative temperature is equal to or higher than a first predetermined temperature when determining the warm-up completion of the internal combustion engine, It is a second aspect to determine that the detection system is abnormal when the temperature of the wall does not exceed the second predetermined temperature in a state where the warm-up completion of the engine is determined.

  In addition to the second aspect, the third aspect of the present invention is that the second predetermined temperature is higher than the first predetermined temperature.

  According to the present invention, in addition to the first aspect, the control unit counts the abnormality when the value corresponding to the difference or ratio between the temperature of the wall portion and the representative temperature is equal to or greater than a predetermined value. When the value is equal to or greater than the predetermined value at the elapse of a predetermined time of the abnormality determination timing unit, it is a fourth aspect to determine that the control system is abnormal.

  According to the internal combustion engine control apparatus according to the first aspect of the present invention described above, the control unit determines the completion of warm-up of the internal combustion engine, based on the wall temperature and the representative temperature. Determine the abnormality of the control system of the internal combustion engine including the detection system that detects the representative temperature and the temperature of the wall, and measure the completion of warm-up from the start of the internal combustion engine, which is timed by the representative temperature and the representative temperature timer. When it is determined that the operating state of the internal combustion engine is in an operating state in which the amount of heat generated by the internal combustion engine is relatively small, the time keeping time is maintained or shortened. In consideration of the operating state of the internal combustion engine, the detection system for detecting the representative temperature of the internal combustion engine and the temperature of the wall portion defining the combustion chamber of the internal combustion engine is detected even if it is an abnormality other than a short circuit. Including such detection systems It is possible to determine the abnormality of the control system of the combustion engine more precisely, together, the operating state of the internal combustion engine can be made appropriate.

  According to the internal combustion engine control apparatus of the second aspect of the present invention, the control unit determines that the representative temperature is equal to or higher than the first predetermined temperature when determining the completion of warm-up of the internal combustion engine, Since it is determined that the detection system is abnormal when the temperature of the wall portion does not exceed the second predetermined temperature in the state where the warm-up of the engine is determined, the representative temperature of the internal combustion engine and An abnormality in the detection system that detects the temperature of the wall that defines the combustion chamber of the internal combustion engine can be detected more accurately.

  According to the internal combustion engine control apparatus according to the third aspect of the present invention, the second predetermined temperature is set to be higher than the first predetermined temperature. The abnormality of the detection system that detects the representative temperature and the temperature of the wall portion that defines the combustion chamber of the internal combustion engine can be determined, and the occurrence of unnecessary influence on the operating state of the internal combustion engine can be suppressed.

  According to the internal combustion engine control apparatus of the fourth aspect of the present invention, when the control unit has a value corresponding to the difference or ratio between the wall temperature and the representative temperature equal to or greater than a predetermined value, the abnormality determination When the time of the time measuring unit is started and the value is equal to or greater than the predetermined value when the predetermined time of the abnormality determining time measuring unit has elapsed, it is determined that the control system is abnormal. Abnormalities in the control system of the internal combustion engine, including a detection system that detects the representative temperature of the engine and the temperature of the wall that defines the combustion chamber of the internal combustion engine, can be determined, and an undesired influence is generated on the operating state of the internal combustion engine This can be suppressed.

FIG. 1 is a block diagram showing a configuration of an internal combustion engine control apparatus according to an embodiment of the present invention. FIG. 2 is a flowchart showing a flow of abnormality determination processing executed by the internal combustion engine control device according to the present embodiment. FIG. 3A is a time chart as an example showing a flow of an abnormality determination process executed by the internal combustion engine control device in the present embodiment, and FIG. 3B is a diagram of the present embodiment after FIG. 6 is a time chart as an example showing a flow of abnormality determination processing executed by the internal combustion engine control device in FIG. FIG. 4A is a diagram illustrating an example of adjustment of the time-measured time in the abnormality determination process executed by the internal combustion engine control device in the present embodiment, and FIG. 4B is an internal combustion engine control device in the present embodiment. It is a figure which shows another example of adjustment of the time after time-measurement in the abnormality determination process which is performed.

  Hereinafter, an internal combustion engine control apparatus according to an embodiment of the present invention will be described in detail with reference to the drawings as appropriate.

[Constitution]
First, the configuration of the internal combustion engine control device in the present embodiment will be described with reference to FIG.

  FIG. 1 is a block diagram showing the configuration of the internal combustion engine control device in the present embodiment.

  As shown in FIG. 1, an internal combustion engine control device 1 according to the present embodiment is included in an electronic control system S and mounted on a vehicle such as a two-wheeled vehicle, and controls the operating state of the internal combustion engine of the vehicle. The internal combustion engine control apparatus 1 in this embodiment includes an ECU (Electronic Control Unit) 60 electrically connected to a throttle opening sensor 20, a crank angle sensor 30, a wall temperature sensor 40, and a coolant temperature sensor 50. Yes. For convenience of explanation, specific illustrations of the configuration of the vehicle and the internal combustion engine are omitted. Further, as a fuel applied to an internal combustion engine, in principle, those that are currently available can be applied, for example, regardless of the type of gasoline, ethanol, methanol, etc., and the type of gasoline octane number is not limited. is there.

  The throttle opening sensor 20 is mounted on the main body of the throttle device of the internal combustion engine, detects the opening of the throttle valve as the throttle opening, and inputs an electric signal indicating the detected throttle opening to the ECU 60.

  In the internal combustion engine, the crank angle sensor 30 is attached to a lower case or the like assembled to the lower part of the cylinder block in a manner facing the tooth portion formed on the outer peripheral surface of the reluctator, and rotates with the rotation of the crankshaft. By detecting the part, the rotational speed of the crankshaft is detected as the rotational speed of the internal combustion engine. The crank angle sensor 30 inputs an electric signal indicating the detected rotational speed of the internal combustion engine to the ECU 60.

  The wall temperature sensor 40 is mounted on a member defining a combustion chamber of the internal combustion engine, that is, a wall of a cylinder block or a cylinder head, detects the temperature of the wall, and detects the detected temperature of the wall. The electric signal shown is input to the ECU 60.

  The cooling water temperature sensor 50 is mounted on the cylinder block in a manner arranged in the cooling water passage of the internal combustion engine, detects the temperature of the cooling water flowing through the cooling water passage, and indicates the temperature of the cooling water thus detected. An electric signal is input to the ECU 60.

  The ECU 60 operates using electric power from a battery provided in the vehicle. The ECU 60 includes A / D conversion circuits 601a, 601b and 601c, a waveform shaping circuit 602, a throttle opening calculation unit 603, a wall temperature calculation unit 604, a coolant temperature calculation unit 605, an operation state control unit 606, and a drive circuit 607a. 607b and 607c. The throttle opening calculation unit 603, the wall temperature calculation unit 604, the cooling water temperature calculation unit 605, and the operation state control unit 606 are not shown in the figure with an arithmetic processing unit such as a CPU (Central Processing Unit) provided in the ECU 60. Are shown as functional blocks when the necessary control program and control data are read out to control the operating state of the internal combustion engine.

  The A / D conversion circuit 601 a converts the analog electrical signal input from the throttle opening sensor 20 into a digital form and inputs the digital signal to the throttle opening calculation unit 603.

  The A / D conversion circuit 601b converts the analog electrical signal input from the wall temperature sensor 40 into a digital format and inputs the digital signal to the wall temperature calculation unit 604.

  The A / D conversion circuit 601c converts the analog electrical signal input from the coolant temperature sensor 50 into a digital format and inputs the digital signal to the coolant temperature calculator 605.

  The waveform shaping circuit 602 performs shaping processing on the electric signal input from the crank angle sensor 30 and then inputs the electric signal to the operation state control unit 606.

  The throttle opening calculation unit 603 calculates the throttle opening by using the electric signal input from the A / D conversion circuit 601a, and the throttle opening calculated by the throttle opening calculation unit 603 is the operating state control. Part 606 is used.

  The wall temperature calculator 604 calculates the temperature of the wall that defines the combustion chamber of the internal combustion engine using the electrical signal input from the A / D conversion circuit 601b. In this way, the wall temperature calculator 604 The calculated wall temperature is used by the operation state control unit 606. The temperature of the wall portion is a temperature of the internal combustion engine that directly reflects the combustion state of the internal combustion engine, and can be evaluated as a temperature that directly reflects the amount of heat generated in the cylinder of the internal combustion engine. It is.

  The cooling water temperature calculation unit 605 calculates the temperature of the cooling water as the temperature of the internal combustion engine (representative temperature of the internal combustion engine) using the electrical signal input from the A / D conversion circuit 601c, and thus the cooling water temperature calculation unit 605 The operating temperature control unit 606 uses the representative temperature of the internal combustion engine calculated by. The temperature of the cooling water is a representative temperature of the internal combustion engine representatively showing the temperature of the internal combustion engine, and can be evaluated as a temperature reflecting the amount of cooling heat for cooling the cylinder of the internal combustion engine. As the representative temperature of the internal combustion engine, the temperature of the lubricating oil of the internal combustion engine may be used in addition to the temperature of the cooling water.

  The operation state control unit 606 includes a differential temperature calculation unit 606a, an operation state determination unit 606b, a sensor abnormality determination unit 606c, a system abnormality determination unit 606d, a representative thermometer timing unit 606e, a warm-up determination unit 606f, and a differential thermometer timing unit 606g. And controlling the overall operation of the internal combustion engine control device 1 and controlling the operating state of the internal combustion engine based on the representative temperature of the internal combustion engine and the temperature of the wall portion defining the combustion chamber of the internal combustion engine. Details of the operation state control unit 606 and the functions of these units will be described later.

  The drive circuit 607a controls the throttle opening by driving the throttle motor 70 in accordance with the control signal input from the operation state control unit 606.

  The drive circuit 607b controls the ignition timing of the internal combustion engine by driving the spark plug 80 in accordance with the control signal input from the operation state control unit 606.

  The drive circuit 607c controls the fuel injection amount of the internal combustion engine by driving the fuel injection valve 90 in accordance with the control signal input from the operation state control unit 606.

  In addition to the throttle opening calculation unit 603, the wall temperature calculation unit 604, the cooling water temperature calculation unit 605, and the operation state control unit 606, a differential temperature calculation unit 606a, an operation state determination unit 606b, a sensor abnormality determination unit 606c, and a system The abnormality determination unit 606d, the representative thermometer timing unit 606e, the warm-up determination unit 606f, and the differential thermometer timing unit 606g are also shown as functional blocks in the operation state control unit 606.

  The internal combustion engine control device 1 having such a configuration includes a detection system that detects the representative temperature of the internal combustion engine and the temperature of the wall that defines the combustion chamber of the internal combustion engine by executing the abnormality determination process described below. The abnormality of the electronic control system S of the internal combustion engine including is determined. Hereinafter, the operation of the internal combustion engine control apparatus 1 when executing the abnormality determination process will be described in detail with further reference to FIGS.

[Abnormality judgment processing]
FIG. 2 is a flowchart showing a flow of abnormality determination processing executed by the internal combustion engine control device 1 according to the present embodiment. FIG. 3A is a time chart as an example showing a flow of an abnormality determination process executed by the internal combustion engine control device 1 in the present embodiment, and FIG. 3B is a diagram illustrating the present embodiment after FIG. It is a time chart as an example which shows the flow of the abnormality determination process which the internal combustion engine control apparatus 1 in a form performs. FIG. 4A is a diagram showing an example of adjusting the time after time measurement in the abnormality determination process executed by the internal combustion engine control apparatus 1 in the present embodiment, and FIG. 4B is an internal combustion engine in the present embodiment. It is a figure which shows another example of adjustment of the time after time measurement in the abnormality determination process which the engine control apparatus 1 performs.

  The flowchart shown in FIG. 2 starts when the ECU 60 is started after the ignition switch of the vehicle is switched from the off state to the on state, and the abnormality determination process proceeds to step S1. Such abnormality determination processing is repeatedly executed at predetermined control cycles by reading out necessary control programs and control data from the memory while the ECU 60 is in the activated state.

  Here, in FIG. 3A and FIG. 4, the timing at which the ECU 60 is started by switching the ignition switch of the vehicle from the OFF state to the ON state is indicated by time t = t1.

  In the process of step S1, the operating state control unit 606 determines whether or not the representative temperature TW of the internal combustion engine, which is the temperature calculated by the cooling water temperature calculation unit 605, is equal to or higher than a predetermined representative temperature. As a result of the determination, when the representative temperature TW of the internal combustion engine is lower than the predetermined representative temperature (step S1: No), the operating state control unit 606 ends the current series of abnormality determination processing. On the other hand, when the representative temperature TW of the internal combustion engine is equal to or higher than the predetermined representative temperature (step S1: Yes), the operating state control unit 606 advances the abnormality determination process to the process of step S2.

  Here, in FIG. 3A, the representative temperature TW of the internal combustion engine is indicated by a line L1, and the timing at which it reaches the predetermined representative temperature is indicated by time t = t1 '.

  In the process of step S2, the operation state determination unit 606b determines whether the current operation state of the internal combustion engine is an operation state in which the amount of heat generated by the internal combustion engine is relatively small, thereby representing a representative thermometer unit. It is determined whether or not it is necessary to adjust the elapsed time (timed time TM) from the start of the internal combustion engine which is timed by 606e. Here, the operating state of the internal combustion engine includes an operating state in which the amount of heat generated by the internal combustion engine is relatively small, including an operating state in which the internal combustion engine is stopped and not combusting. Examples of the operation state in which the amount of heat generated by the engine is relatively small include, for example, the operation stop state of the internal combustion engine, the operation state with the fuel cut, the operation state with the ignition cut, and the operation state with a predetermined throttle opening or less. Can be mentioned. The representative thermometer time unit 606e is exemplified as a subtraction timer. As a result of the determination, if the current operating state of the internal combustion engine is not in an operating state in which the internal combustion engine has a relatively small amount of heat generated by the internal combustion engine (step S2: No), the operating state determination unit 606b It is determined that there is no need to adjust the time TM after timekeeping, and the abnormality determination process proceeds to the process of step S4. On the other hand, when the current operation state of the internal combustion engine is an operation state in which the operation state of the internal combustion engine is relatively low in the amount of heat generated by the internal combustion engine (step S2: Yes), the operation state determination unit 606b It is determined that it is necessary to adjust the post-time keeping time TM in order to avoid the low temperature detection abnormality of the wall temperature sensor 40 due to the cooling water temperature decrease, and the abnormality determination process proceeds to the process of step S3.

  In the process of step S3, the operating state control unit 606 determines the representative thermometer according to the length of time corresponding to the period in which the operating state of the internal combustion engine is in the operating state in which the amount of heat generated by the internal combustion engine is relatively small. The time-measurement time TM is adjusted by stopping or shortening the time-measurement process of the time-measurement time TM counted by the time 606e. Specifically, if the operating state of the internal combustion engine is an operating state in which the amount of heat generated by the internal combustion engine is relatively small, the operating state determination unit 606b is the operating state in the fuel cut of the internal combustion engine. As shown in (a), the time TM after time measurement at the end of the operation state in the fuel cut of the internal combustion engine (time t = t3) is changed to the time TM1 after time measurement at the start of the operation state in the fuel cut of the internal combustion engine. Returning, or as shown in FIG. 4 (b), from the start of the operation state in the fuel cut of the internal combustion engine (time t = t2) to the end of the operation state in the fuel cut of the internal combustion engine (time t = t3) For example, an example in which the measured time TM is maintained at the measured time TM1 at the start of the operation state in the fuel cut of the internal combustion engine. In the example shown in FIGS. 4 (a) and 4 (b), the value of the timed time TM after adjustment is changed from the value corresponding to the timed time TM1 at the start of the operating state in the fuel cut of the internal combustion engine. It may be increased or decreased. Thereby, the process of step S3 is completed, and the abnormality determination process proceeds to the process of step S4.

  In the process of step S4, the warm-up determination unit 606f determines whether or not the time-measured time TM has exceeded a predetermined time since the start of the internal combustion engine. As a result of the determination, if the post-time TM has not exceeded the predetermined time since the start of the internal combustion engine (step S4: No), the warm-up determination unit 606f determines that the internal combustion engine has not been warmed up. Then, the current series of abnormality determination processing ends. On the other hand, when the post-time time TM has exceeded a predetermined time since the start of the internal combustion engine (step S4: Yes), the warm-up determination unit 606f determines that the internal combustion engine has been warmed-up, and performs abnormality determination processing. Advances to step S5.

  Here, in FIGS. 3A and 4, the timing at which the post-time measurement TM elapses a predetermined time from the start of the internal combustion engine is indicated by time t = t4.

  In the process of step S5, the operation state control unit 606 determines whether or not the wall temperature TCC calculated by the wall temperature calculation unit 604 is equal to or higher than a predetermined wall temperature. Here, the predetermined wall temperature is set based on a condition that the wall temperature sensor 40 is not warmed most during the operation of the internal combustion engine, such as when the outside air temperature is low and the vehicle is running at a low speed (a state where the driving wind is hit). Is preferred. Further, the wall temperature TCC is evaluated as a temperature of the internal combustion engine that directly reflects the combustion state of the internal combustion engine and directly reflects the amount of heat generated in the cylinder of the internal combustion engine. In consideration of what is obtained, the predetermined wall temperature is preferably set to a temperature higher than the predetermined representative temperature. As a result of the determination, when the wall temperature TCC is equal to or higher than the predetermined wall temperature (step S5: Yes), the operation state control unit 606 ends the current series of abnormality determination processing. On the other hand, when the wall temperature TCC is lower than the predetermined wall temperature (step S5: No), the operation state control unit 606 advances the abnormality determination process to the process of step S6.

  Here, in FIG. 3A, in the line L2 indicating an example of the wall temperature TCC, the wall temperature TCC has reached the predetermined wall temperature before time t = t4. In a line L3 indicating another example of the temperature TCC, the wall temperature TCC does not reach the predetermined wall temperature at the time t = t4.

  In the process of step S6, the sensor abnormality determination unit 606c sets the wall temperature sensor 40, the cooling water temperature sensor 50, and the detection system including these electric paths, that is, the representative temperature of the internal combustion engine and the combustion chamber of the internal combustion engine. It is determined that an abnormality has occurred in any of the detection systems that detect the temperature of the defining wall. Here, when the internal combustion engine has multiple cylinders, it is preferable to detect such an abnormality in consideration of the temperature difference of the wall temperature between the cylinders in order to mount a wall temperature sensor for each cylinder. Moreover, it is preferable that the comparison object between the cylinders of the internal combustion engine is a comparison between cylinders having a small temperature difference between the cylinders. For example, when the internal combustion engine is an in-line four cylinder, it is preferable to compare between the first cylinder and the fourth cylinder, and between the second cylinder and the third cylinder, which have a small temperature difference in the normal state. Thereby, the process of step S6 is completed, and the abnormality determination process proceeds to the process of step S7.

  Here, in FIG. 3A, in the line L2 indicating an example of the wall temperature TCC, the wall temperature TCC has reached the predetermined wall temperature before time t = t4. Although it is not determined that an abnormality has occurred in any of the detection system including the sensor 40, the cooling water temperature sensor 50, and these electrical paths, in a line L3 indicating another example of the wall temperature TCC, Since the wall temperature TCC has not reached the predetermined wall temperature at time t = t4, an abnormality has occurred in the wall temperature sensor 40, the cooling water temperature sensor 50, or any of the detection systems including these electrical paths. It will be determined that

  In the process of step S7, the operating state control unit 606 determines whether the representative temperature TW is equal to or higher than a predetermined representative temperature. As a result of the determination, when the representative temperature TW is lower than the predetermined representative temperature (step S7: No), the operation state control unit 606 ends the current series of abnormality determination processing. On the other hand, when the representative temperature TW is equal to or higher than the predetermined representative temperature (step S7: Yes), the operation state control unit 606 advances the abnormality determination process to the process of step S8.

  Here, typically, in FIG. 3A, the representative temperature TW of the internal combustion engine has already reached the predetermined representative temperature at time t = t1 ′, and therefore, at the time of execution of the process of step S7, the internal combustion engine The engine representative temperature TW is already equal to or higher than the predetermined representative temperature at time t = t1 ′.

  In step S8, the operating state control unit 606 determines whether or not the difference temperature TCCD, which is the difference value between the representative temperature TW calculated by the difference temperature calculation unit 606a and the wall temperature TCC, is equal to or higher than a predetermined difference temperature. Determine. If the difference temperature TCCD is equal to or higher than the predetermined difference temperature as a result of the determination (step S8: Yes), the operating state control unit 606 advances the abnormality determination process to the process of step S9. On the other hand, when the differential temperature TCCD is lower than the predetermined differential temperature (step S8: No), the operation state control unit 606 ends the current series of abnormality determination processing. In such a case, instead of the differential temperature TCCD which is a difference value between the representative temperature TW calculated by the differential temperature calculation unit 606a and the wall temperature TCC, the representative temperature TW calculated by the differential temperature calculation unit 606a and the wall temperature A ratio with the temperature TCC may be used.

  Here, in FIG. 3B, the differential temperature TCCD is indicated by a line L4, and the timing at which the differential temperature TCCD reaches a predetermined differential temperature is indicated by time t = t5.

  In the process of step S9, whether or not the post-time-measurement time TM ′ at which the operation state control unit 606 has started the time measurement when the differential temperature measuring unit 606g starts measuring the differential temperature TCCD at the predetermined differential temperature or more has passed. Is determined. As a result of the determination, when the post-time TM ′ timed by the differential thermometer 606g does not elapse for a predetermined time or more (step S9: No), the operating state controller 606 ends the current series of abnormality determination processing. . On the other hand, when the time-measured time TM ′ timed by the differential thermometer 606g has elapsed a predetermined time or more (step 9: Yes), the operation state controller 606 advances the abnormality determination process to the process of step S10. .

  Here, in FIG. 3B, the timing at which the predetermined time elapses from the timing at which the time difference TMTCCD becomes equal to or higher than the predetermined differential temperature is indicated by time t = t6.

  In the process of step S10, the system abnormality determination unit 606d determines that an abnormality has occurred in the electronic control system S of the internal combustion engine, notifies the driver or the like that the abnormality has occurred, and the operation state control unit 606 Perform the necessary error handling process. Thereby, the process of step S10 is completed and this series of abnormality determination process is complete | finished.

  Here, in FIG. 3B, the line L4 indicating the differential temperature TCCD is equal to or higher than the predetermined differential temperature even at the time t = t6, and thus an abnormality has occurred in the electronic control system S of the internal combustion engine. It will be determined.

  As is apparent from the above description, in the internal combustion engine control apparatus 1 according to the present embodiment, the control unit 606 determines whether the internal combustion engine has been warmed up, based on the wall temperature and the representative temperature. When the internal combustion engine is started, the abnormality of the control system S of the internal combustion engine including the detection system for detecting the representative temperature of the engine and the temperature of the wall portion is determined, and the completion of warm-up is measured by the representative temperature and the representative thermometer timing unit. If the operation state of the internal combustion engine is determined to be in an operation state in which the amount of heat generated by the internal combustion engine is relatively small, the time measurement time is maintained or shortened. In this configuration, in consideration of the operating state of the internal combustion engine, the abnormality of the detection system that detects the representative temperature of the internal combustion engine and the temperature of the wall that defines the combustion chamber of the internal combustion engine is an abnormality other than a short circuit. Can also detect Such detection system can determine the abnormality of the control system S of an internal combustion engine accurately comprising, together, the operating state of the internal combustion engine can be made appropriate.

  Further, in the internal combustion engine control apparatus 1 according to the present embodiment, when the control unit 606 determines that the warm-up of the internal combustion engine is completed, it is determined that the representative temperature is equal to or higher than the first predetermined temperature, and the warm-up of the internal combustion engine is determined. If the wall temperature does not exceed the second predetermined temperature with the completion of the machine determined, it is determined that the detection system is abnormal. Therefore, with a simple configuration, the representative temperature of the internal combustion engine and the internal combustion engine Abnormalities in the detection system that detects the temperature of the wall that defines the combustion chamber can be detected more accurately.

  Further, in the internal combustion engine control apparatus 1 in the present embodiment, the second predetermined temperature is set to be higher than the first predetermined temperature, so that the representative temperature of the internal combustion engine and the internal combustion engine can be increased in a more reliable manner. Abnormality of the detection system that detects the temperature of the wall portion that defines the combustion chamber of the internal combustion engine can be determined, and the occurrence of unnecessary influence on the operating state of the internal combustion engine can be suppressed.

  Further, in the internal combustion engine control apparatus 1 according to the present embodiment, the control unit 606 counts the time of the abnormality determination timing unit when the value corresponding to the difference or ratio between the wall temperature and the representative temperature is equal to or greater than a predetermined value. If the value is equal to or greater than the predetermined value when the predetermined time of the abnormality determination timing unit elapses, it is determined that the control system S is abnormal, and the combustion of the internal combustion engine is performed in a more reliable manner. Abnormality of the control system S of the internal combustion engine including the detection system that detects the temperature of the wall portion that defines the chamber can be determined, and occurrence of unnecessary influence on the operating state of the internal combustion engine can be suppressed.

  In the present embodiment, control is performed based on a value corresponding to the differential temperature TCCD, but similar control may be performed based on a value corresponding to the ratio between the wall temperature and the representative temperature.

  In the present invention, the type, shape, arrangement, number, and the like of the members are not limited to the above-described embodiment, and the gist of the invention is appropriately replaced such that the constituent elements are appropriately replaced with those having the same operational effects. Of course, it can be changed as appropriate without departing from the scope.

  As described above, the present invention is a detection system that detects the representative temperature of the internal combustion engine and the temperature of the wall that defines the combustion chamber of the internal combustion engine, taking into consideration the operating state of the internal combustion engine, with a simple configuration. Abnormalities other than short-circuits can be detected, the abnormality of the control system of the internal combustion engine including such a detection system can be determined more accurately, and the operating state of the internal combustion engine should be appropriate. Therefore, it is expected that it can be widely applied to an internal combustion engine of a vehicle such as a motorcycle.

DESCRIPTION OF SYMBOLS S ... Electronic control system 1 ... Internal combustion engine control device 20 ... Throttle opening sensor 30 ... Crank angle sensor 40 ... Wall part temperature sensor 50 ... Cooling water temperature sensor 60 ... ECU
DESCRIPTION OF SYMBOLS 70 ... Throttle motor 80 ... Spark plug 90 ... Fuel injection valve 601a, 601b and 601c ... A / D conversion circuit 602 ... Waveform shaping circuit 603 ... Throttle opening degree calculation part 604 ... Wall part temperature calculation part 605 ... Cooling water temperature calculation part 606 ... Operating state control unit 606a ... Differential temperature calculation unit 606b ... Operating state determination unit 606c ... Sensor abnormality determination unit 606d ... System abnormality determination unit 606e ... Representative thermometer timing unit 606f ... Warm-up determination unit 606g ... Differential thermometer timing unit 607a, 607b And 607c ... Driving circuit

Claims (4)

In the internal combustion engine control device having a control unit for controlling the operation state of the internal combustion engine based on the temperature of the wall portion defining the combustion chamber of the internal combustion engine and the representative temperature of the internal combustion engine,
The controller is
The internal combustion engine including a detection system for detecting a representative temperature of the internal combustion engine and the temperature of the wall portion based on the temperature of the wall portion and the representative temperature in a state where the completion of warm-up of the internal combustion engine is determined. Determine the abnormality of the engine control system,
The determination of the completion of warm-up is performed based on the time measured from the start of the internal combustion engine, which is measured by the representative temperature and the representative temperature measuring unit,
An internal combustion engine control apparatus, wherein when the operation state of the internal combustion engine is determined to be an operation state in which the amount of heat generated by the internal combustion engine is relatively small, the time measurement is held or shortened. The controller is
When determining the completion of warming-up of the internal combustion engine, a determination condition is that the representative temperature is equal to or higher than a first predetermined temperature,
2. The detection system according to claim 1, wherein when the warm-up completion of the internal combustion engine is determined and the temperature of the wall portion does not exceed a second predetermined temperature, it is determined that the detection system is abnormal. The internal combustion engine control device.   The internal combustion engine controller according to claim 2, wherein the second predetermined temperature is higher than the first predetermined temperature. The controller is
When a value corresponding to a difference or ratio between the temperature of the wall and the representative temperature is equal to or greater than a predetermined value, the time measurement for the abnormality determination time unit is started, and the time of the predetermined time of the abnormality determination time unit is 2. The internal combustion engine control device according to claim 1, wherein when the value is equal to or greater than the predetermined value at the elapse of time, it is determined that the control system is abnormal.