JP2019124198A - Abnormality determination device - Google Patents

Abstract

An output of a first temperature sensor for detecting a temperature of an internal combustion engine and an output of a second temperature sensor for detecting a temperature of air taken into the internal combustion engine have no correlation, Provided is an abnormality determination device that can determine that the first temperature sensor is normal when only the second temperature sensor is abnormal. A diagnostic device (140) outputs an output of a water temperature sensor (120) from the start of operation of an internal combustion engine (1) to the end of operation of the engine (1) when at least one of a water temperature sensor (120) and an intake air temperature sensor (130) obtains a determination result that is abnormal. When the temperature Tw of the internal combustion engine 1 indicates a value that has passed through a predetermined temperature band, it is determined that the water temperature sensor 120 is normal. [Selection diagram] Fig. 1

Description

  The present invention relates to an abnormality determination apparatus that determines an abnormality of a temperature sensor.

  In recent years, in order to improve the stability of behavior at the time of start of the vehicle or at the time of traveling, an engine control device for controlling an engine which is an internal combustion engine mounted on the vehicle has been proposed. Such an engine control device employs a configuration in which the engine is controlled based on values calculated from detection signals of various sensors such as temperature sensors. However, when an abnormality such as a failure occurs in these various sensors, an event may occur in which the engine can not be optimally controlled. Therefore, conventionally, the engine is optimally controlled by detecting such an abnormality and displaying a message prompting replacement of parts.

  In addition, in the agreement on OBD (On Board Diagnostic) which is a failure diagnosis function of a vehicle, it is defined that abnormal conditions such as failure of various sensors mounted on the vehicle are detected and management of abnormal history information is performed. There is. The detection of the above-mentioned abnormal condition in the regulations relating to the OBD is conventionally obligated in four-wheeled vehicles, and in a flow that will be obligated in two-wheeled vehicles in the future.

  Under such circumstances, Patent Document 1 relates to an abnormality detection device for a temperature sensor, monitors the consistency of the output of the intake air temperature sensor and the water temperature sensor after starting the engine after stopping the engine for a certain period of time, and matches the output. A configuration is disclosed that includes an abnormality determination unit that determines that both the intake air temperature sensor and the water temperature sensor are abnormal when there is no polarity.

JP, 2007-192045, A

  However, according to the study of the inventor of the present invention, in the abnormality detection device for a temperature sensor according to Patent Document 1, any one of the intake temperature sensor and the water temperature sensor when the outputs of the intake temperature sensor and the water temperature sensor do not match. Even if only the abnormality is abnormal, it can not be specified which of the intake air temperature sensor and the water temperature sensor is abnormal.

  The present invention has been made after the above study, and an output of a first temperature sensor for detecting a temperature of an internal combustion engine and an output of a second temperature sensor for detecting a temperature of air taken into the internal combustion engine It is an object of the present invention to provide an abnormality determination device capable of determining that the first temperature sensor is normal when there is no correlation between the two and only the second temperature sensor is abnormal. Do.

  In order to achieve the above object, the present invention provides, in a first aspect, a first temperature sensor for detecting a temperature of an internal combustion engine when a predetermined time has elapsed from the time of stopping operation of the internal combustion engine mounted on a vehicle. Both the first temperature sensor and the second temperature sensor are normal based on the correlation between the output of the second temperature sensor that detects the temperature of the air taken into the internal combustion engine and the temperature of the air taken into the internal combustion engine It has an abnormality judgment part which acquires a judgment result, or a judgment result that at least one of the first temperature sensor and the second temperature sensor is abnormal, and the abnormality judgment part is said that at least one is abnormal. When the determination result is acquired, the temperature of the internal combustion engine indicated by the output of the first temperature sensor from the start of the operation to the end of the operation of the internal combustion engine indicates a value passing through a predetermined temperature range Said Temperature sensor is abnormal determination device determined to be normal.

  In addition to the first aspect of the present invention, the first temperature sensor detects the temperature of the cooling water of the internal combustion engine as the temperature of the internal combustion engine, and the abnormality determination unit detects the temperature of the internal combustion engine. When the temperature of the internal combustion engine indicated by the output of the first temperature sensor when a predetermined time has elapsed from the start of the operation is less than the predetermined temperature, the first operation is stopped from the start of the operation of the internal combustion engine A second aspect of the present invention is to determine that the thermostat is abnormal when the temperature of the internal combustion engine indicated by the output of the temperature sensor indicates a value passing through a predetermined temperature range.

  Further, in the present invention, in addition to the first or second aspect, when the abnormality determination unit acquires the determination result that at least one is abnormal, excluding the thermostat from the determination target. Phase of

  In the abnormality determination device according to the first aspect of the present invention described above, the output of a first temperature sensor that detects the temperature of the internal combustion engine when a predetermined time has elapsed since the time the operation of the internal combustion engine mounted on the vehicle was stopped. Or the determination result that both the first temperature sensor and the second temperature sensor are normal based on the correlation between the temperature of the air taken into the internal combustion engine and the output of the second temperature sensor that detects the temperature of the air taken into the internal combustion engine, or The internal combustion engine has an abnormality determination unit that acquires a determination result that at least one of the first temperature sensor and the second temperature sensor is abnormal, and the abnormality determination unit acquires the determination result that at least one is abnormal. The first temperature sensor is determined to be normal when the temperature of the internal combustion engine indicated by the output of the first temperature sensor indicates a value passing through a predetermined temperature zone from the start of operation to the end of operation of the engine It is a thing A case where there is no correlation between the output of a first temperature sensor that detects the temperature of the internal combustion engine and the output of a second temperature sensor that detects the temperature of the air drawn into the internal combustion engine, It is possible to determine that the first temperature sensor is normal if only the temperature sensor is abnormal.

  Further, according to the abnormality determination device according to the second aspect of the present invention, the first temperature sensor detects the temperature of the cooling water of the internal combustion engine as the temperature of the internal combustion engine, and the abnormality determination unit operates the operation of the internal combustion engine When the temperature of the internal combustion engine indicated by the output of the first temperature sensor when a predetermined time has elapsed from the start is less than the predetermined temperature, the output of the first temperature sensor from the operation start time to the operation stop time of the internal combustion engine The first temperature sensor is abnormal when the thermostat is abnormal because the thermostat is determined to be abnormal when the temperature of the internal combustion engine indicated by the indicates a value passing through the predetermined temperature range. It can prevent that it is misjudged.

  Further, according to the abnormality determination apparatus according to the third aspect of the present invention, the abnormality determination unit excludes the thermostat from the determination target when at least one determination result is acquired that is abnormal. When any one of the first temperature sensor and the second temperature sensor is abnormal, it is possible to prevent the thermostat from being erroneously determined to be abnormal.

FIG. 1 is a schematic view showing the configuration of an abnormality determination system according to an embodiment of the present invention. Fig.2 (a) is a figure which shows transition of the temperature detected by the intake air temperature sensor and water temperature sensor after the operation stop of the internal combustion engine in embodiment of this invention, FIG.2 (b) is embodiment of this invention It is a figure which shows transition of the temperature detected by the water temperature sensor after the operation | movement start of the internal combustion engine in these. FIG. 3 is a flowchart showing the flow of the abnormality determination process according to the embodiment of the present invention.

  Hereinafter, the abnormality determination device in the embodiment of the present invention will be described in detail with reference to the drawings as appropriate.

<Configuration of Internal Combustion Engine>
The configuration of an internal combustion engine to which the abnormality determination system according to this embodiment of the present invention is applied will be described with reference to FIG.

  FIG. 1 is a schematic view showing the configuration of an abnormality determination system according to an embodiment of the present invention.

  As shown in FIG. 1, the internal combustion engine 1 to which the abnormality determination system 100 in the present embodiment is applied is a single-cylinder internal combustion engine mounted on a vehicle such as a two-wheeled vehicle (not shown). And a cylinder block 2 having the Although the internal combustion engine 1 to which the abnormality determination system 100 in the present embodiment is applied is typically a four-stroke one-cycle internal combustion engine, it may be a two-stroke one-cycle internal combustion engine as required. .

  A coolant passage 3 is formed in a side wall of a portion of the cylinder block 2 corresponding to the cylinder 2 a. A piston 4 is disposed inside the cylinder 2a. The piston 4 is connected to the crankshaft 6 via a connecting rod 5. The crankshaft 6 is provided with a reluctor 7 which rotates coaxially therewith.

  The cylinder head 8 is assembled to the upper portion of the cylinder block 2. The inner wall surface of the cylinder block 2, the upper surface of the piston 4 and the inner wall surface of the cylinder head 8 cooperate to define a combustion chamber 9 of the cylinder 2a.

  A coolant, which is cooling water for cooling the cylinder block 2 flowing by the water pump 42, flows through the coolant passage 3. A radiator 46 disposed close to an outdoor heat exchanger (not shown) is connected to the coolant passage 3 via a thermostat 48. The thermostat 48 and the water pump 42 are connected by a bypass passage 50. The thermostat 48 has a path in which the coolant flowing in the coolant passage 3 circulates through the radiator 46 without passing through the bypass passage 50, and a path through which the coolant flowing through the bypass passage 50 circulates without passing through the radiator 46. , Switch.

  The cylinder head 8 is provided with an ignition plug 10 for igniting a mixture of fuel and air in the combustion chamber 9, and an intake pipe 11 corresponding to the combustion chamber 9 is assembled. An intake passage 11 a is formed in the cylinder head 8 to communicate the combustion chamber 9 and the intake pipe 11 correspondingly. An intake valve 12 is provided at the corresponding connection site between the combustion chamber 9 and the intake passage 11a.

  The intake pipe 11 is provided with an injector (not shown) for injecting fuel into the interior thereof. The intake pipe 11 is provided with a throttle valve 14 on the upstream side of the injector. The throttle valve 14 is a component of a throttle device (not shown), and a main body of the throttle device is assembled to the intake pipe 11.

  Further, an exhaust pipe 15 communicating with the combustion chamber 9 is assembled to the cylinder head 8. In the cylinder head 8, an exhaust passage 15a is formed which communicates the combustion chamber 9 and the exhaust passage 15a correspondingly. An exhaust valve 16 is provided at the corresponding connection site between the combustion chamber 9 and the exhaust pipe 15.

<Configuration of anomaly judgment system>
The configuration of the abnormality determination system 100 according to the embodiment of the present invention will be described with reference to FIG.

  As shown in FIG. 1, the abnormality determination system 100 in the present embodiment includes an electronic control unit (ECU) 110, a water temperature sensor 120, an intake air temperature sensor 130, and a diagnostic device 140.

  The ECU 110 operates using power from a battery provided in the vehicle, and includes a ROM 111, a RAM 112, a timer 113, and a CPU (Central Processing Unit) 114.

  The ROM 111 is configured of a non-volatile storage device, and stores control programs and control data.

  The RAM 112 is configured of a volatile storage device and functions as a working area of the CPU 114.

  The timer 113 executes timekeeping processing in accordance with a control signal from the CPU 114. The timer 113 is configured to be able to execute timekeeping processing even when the ignition switch is turned off.

  The CPU 114 controls the overall operation of the ECU 110 in accordance with electrical signals from the water temperature sensor 120 and the intake air temperature sensor 130 and the like. Further, the CPU 114 functions as an abnormality determination unit 115 that executes preprocessing of abnormality determination processing described later by executing a control program stored in the ROM 111.

  The water temperature sensor 120 is mounted on the cylinder block 2 in such a manner as to enter the coolant passage 3, detects the temperature of the coolant flowing in the coolant passage 3 as the temperature of the internal combustion engine 1, and detects the temperature of the internal combustion engine 1 detected in this manner. Are input to the ECU 110.

  The intake air temperature sensor 130 is attached to the intake pipe 11 in such a manner as to enter the intake pipe 11 and detects the temperature of the air flowing into the intake pipe 11 as an intake air temperature which is the temperature of the air taken into the internal combustion engine 1 An electric signal indicating the intake air temperature detected in this manner is input to the ECU 110.

  The diagnostic machine 140 is an external device detachably connected to the ECU 110 via a connection portion (not shown) such as an OBD connector provided in a vehicle, and includes a ROM 141, a RAM 142, and a CPU 143.

  The ROM 141 is configured of a non-volatile storage device, and stores control programs and control data.

  The RAM 142 is configured of a volatile storage device and functions as a working area of the CPU 143.

  The CPU 143 controls the overall operation of the diagnostic device 140. In addition, the CPU 143 functions as an abnormality determination unit 144 that executes an abnormality determination process described later by executing a control program stored in the ROM 141.

  The CPU 115 of the ECU 110 having the above configuration executes the pre-processing of the abnormality determination processing described below, and the CPU 143 of the diagnostic device 140 having the above configuration executes the below-described abnormality determination processing.

Pre-processing of abnormality determination processing
First, with reference to FIG. 2, the specific flow of the pre-processing of the abnormality determination processing in the embodiment of the present invention will be described in detail.

  Fig.2 (a) is a figure which shows transition of the temperature detected by the intake air temperature sensor and water temperature sensor after the operation stop of the internal combustion engine in embodiment of this invention, FIG.2 (b) is embodiment of this invention It is a figure which shows transition of the temperature detected by the water temperature sensor after the operation | movement start of the internal combustion engine in these. In FIG. 2B, Tw1 and Tw2 indicate the temperature Tw detected by the water temperature sensor 120. Moreover, Tw1 and Tw2 illustrate temperature Tw which shows the different behavior detected by water temperature sensor 120. Further, in FIG. 2A and FIG. 2B, RUN indicates a state in which the internal combustion engine 1 is operating, and STOP indicates a state in which the internal combustion engine 1 is stopped.

  The CPU 114 of the ECU 110 executes a temperature decrease sticking check process, a correlation check process, a temperature increase sticking check process, and the like as pre-processes of the abnormality determination process. The CPU 114 may not necessarily execute all of the temperature decrease fixation check process, the correlation check process, and the temperature increase fixation check process, and some of the temperature decrease fixation check process, the correlation check process, and the temperature increase fixation check process You may only run

  First, the abnormality determination unit 115 of the CPU 114 causes the timer 113 to start timing processing when the operation of the internal combustion engine 1 ends. Specifically, as shown in FIG. 2A, the abnormality determination unit 115 causes the timer 113 to start time measurement processing at time t1 when the operation of the internal combustion engine 1 ends. From the above configuration, the timer 113 also executes timekeeping processing after time t1 when the ignition switch is turned off.

  Next, when the ignition switch is switched from the off state to the on state, abnormality determination unit 115 satisfies the condition to be the result of counting after a predetermined period has elapsed from the end of operation of internal combustion engine 1 in the timing process. If a determination result satisfying this condition is obtained, the temperature decrease sticking check execution flag indicating execution of the temperature decrease sticking check processing is stored in the RAM 112 and the temperature decrease sticking check processing is started.

  Specifically, as shown in FIG. 2A, the abnormality determination unit 115 counts time when a predetermined period T1 has elapsed from time t1 in timekeeping processing at time t2 when the ignition switch is switched from the off state to the on state. As a result, the temperature decrease sticking check execution flag is stored in the RAM 112, and the temperature decrease sticking check process is started. On the other hand, when the ignition switch is switched from the off state to the on state, the abnormality determination unit 115 determines that the predetermined time T1 has not been reached when the predetermined time T1 has not elapsed from time t1 in the timing process. When the elapsed time result is obtained, the temperature decrease sticking check execution flag is stored in the RAM 112 and the temperature decrease sticking check process is started.

  In the temperature decrease sticking check process, the abnormality determination unit 115 determines the temperature Tw indicated by the electric signal input from the water temperature sensor 120 after the result of counting time that has elapsed from the end of the operation of the internal combustion engine 1 in the counting process. Information indicating that the temperature decrease sticking check result is normal or abnormal is stored in the RAM 112 according to the comparison result with the threshold Th1.

  Specifically, as shown in FIG. 2A, since the abnormality determination unit 115 determines that the temperature Tw is lower than the threshold Th1 at time t2 after the result of counting of the predetermined period T1 from time t1. Information indicating that the temperature decrease sticking check result is normal is stored in the RAM 112. On the other hand, when the temperature Tw is equal to or higher than the threshold Th1 after the time measurement result in which the predetermined period T1 has elapsed from the time t1, the abnormality determination unit 115 causes the information indicating that the temperature decrease sticking check result is abnormal. Store in

  In addition, when the ignition switch is switched from the off state to the on state, the abnormality determination unit 115 determines whether or not the condition that results in the counting result after a predetermined period has elapsed from the end of the operation of the internal combustion engine 1 in the counting process. If a determination result satisfying the condition is obtained, a correlation check execution flag indicating execution of the correlation check process is stored in the RAM 112 and the correlation check process is started. Here, the predetermined period in which the correlation check process can be performed is longer than the predetermined period in which the temperature decrease sticking check process can be performed.

  Specifically, as shown in FIG. 2A, the abnormality determination unit 115 performs a predetermined period T2 (T1 <T2) in timekeeping processing at time t2 when the ignition switch is switched from the off state to the on state. Since the result of counting time has passed, the correlation check execution flag is stored in the RAM 112 and the correlation check process is started. On the other hand, when the ignition switch is switched from the off state to the on state, abnormality determination unit 115 determines that predetermined time T2 is reached when the predetermined time period T2 has not elapsed from time t1 in the time measurement process. When the elapsed time measurement result is obtained, the correlation check execution flag is stored in the RAM 112 and the correlation check process is started.

  In the correlation check process, the abnormality determination unit 115 determines the temperature Ta indicated by the electrical signal input from the intake air temperature sensor 130 after the result of the time counting process in which the predetermined time has elapsed from the end of the operation of the internal combustion engine 1 in the time counting process. If there is a correlation with the temperature Tw indicated by the electric signal input from the water temperature sensor 120, information indicating that the correlation check result is normal is stored in the RAM 112.

  Specifically, as shown in FIG. 2A, abnormality determination unit 115 determines the intake air temperature at time t2 after the time measurement result in which the predetermined period has elapsed since the end of the operation of internal combustion engine 1 in the time measurement process. A subtraction value obtained by subtracting a predetermined value α from the temperature Ta indicated by the electric signal input from the sensor 130, and an addition value obtained by adding the predetermined value β to the temperature Ta indicated by the electric signal input from the intake air temperature sensor 130 . Then, when the temperature Tw indicated by the electric signal input from the water temperature sensor 120 is larger than the subtraction value (Ta−α) and less than the addition value (Ta + β), the abnormality determination unit 115 correlates the temperature Ta with the temperature Tw. Since there is a relationship, information indicating that the correlation check result is normal is stored in the RAM 112.

  On the other hand, in the correlation check process, the abnormality determination unit 115 determines the temperature indicated by the electrical signal input from the intake air temperature sensor 130 after the result of the timekeeping process after the predetermined time has elapsed from the end of the operation of the internal combustion engine 1 in the timekeeping process. If there is no correlation between Ta and the temperature Tw indicated by the electric signal input from the water temperature sensor 120, information indicating that the correlation check result is abnormal is stored in the RAM 112.

  Specifically, abnormality determination unit 115 subtracts temperature Tw indicated by the electric signal input from water temperature sensor 120 after the result of counting after a predetermined period has elapsed from the end of the operation of internal combustion engine 1 in the timing process. When the value is less than the value (Ta−α) or the added value (Ta + β), the temperature Ta and the temperature Tw have no correlation, so information indicating that the result of the correlation check is abnormal is stored in the RAM 112.

  Further, the abnormality determination unit 115 causes the timer 113 to start timekeeping processing when the operation of the internal combustion engine 1 is started. Specifically, as shown in FIG. 2B, the abnormality determination unit 115 causes the timer 113 to start time measurement processing at time t3 when the operation of the internal combustion engine 1 is started.

  Next, the abnormality determination unit 115 determines whether or not the time measurement process satisfies a condition that results in time measurement after a predetermined period has elapsed from the start of operation of the internal combustion engine 1, and the determination result satisfying the condition is obtained. If it is determined that the temperature increase sticking check execution flag indicating the execution of the temperature rising sticking check process is stored in the RAM 112, the temperature raising sticking check process is started.

  Specifically, as shown in FIG. 2 (b), when the result of counting the predetermined period T3 has elapsed from time t3 at the start of operation of the internal combustion engine 1 in the timing processing, the temperature increase sticking check execution flag While storing in the RAM 112, the temperature rise sticking check process is started. On the other hand, the abnormality determination unit 115 rises when the counting result after the predetermined time T3 has elapsed when the counting result does not elapse from the time t3 when the operation of the internal combustion engine 1 has started. The thermal fixation check execution flag is stored in the RAM 112 and the temperature rise fixation check process is started.

  In the temperature increase sticking check process, the abnormality determination unit 115 determines the temperature Tw indicated by the electric signal input from the water temperature sensor 120 when the time measurement result shows that the predetermined period has elapsed from the start of operation of the internal combustion engine 1 in the time counting process. In accordance with the comparison result of the threshold value Th2 and the threshold value Th2, information indicating that the temperature increase sticking check result is normal or abnormal is stored in the RAM 112.

  Specifically, as shown in FIG. 2 (b), the abnormality determination unit 115 determines that the temperature has reached a predetermined time period T3 from time t2 at the start of operation of the internal combustion engine 1 in the timekeeping process. Since Tw1 is higher than the threshold value Th2, information indicating that the temperature increase sticking check result is normal is stored in the RAM 112. On the other hand, as shown in FIG. 2B, the abnormality determination unit 115 sets the temperature Tw2 to the threshold value when the predetermined time period T3 has elapsed from time t2 at the start of operation of the internal combustion engine 1 in the timekeeping process. Since it is Th2 or less, the information which shows that the temperature rising sticking check result is abnormal is stored in RAM112.

  Further, abnormality determination unit 115 causes RAM 112 to transmit information indicating whether temperature Tw indicated by the output of water temperature sensor 120 from the start of operation of internal combustion engine 1 to the end of operation indicates a value that has passed a predetermined temperature range F. Store. The predetermined temperature zone F includes the threshold value Th2 described above. Further, passing through the temperature zone F means that the temperature Tw changes from a value less than the threshold Th3 which is the lower limit value of the temperature zone F to a value larger than the threshold Th4 which is the upper limit value of the temperature zone F.

  Specifically, as shown in FIG. 2B, abnormality determination unit 115 sets threshold temperature Tw1 or temperature Tw2 in the period from time t3 when operation of internal combustion engine 1 ends to time t4 when operation starts. Since a value passing through the temperature zone F that is greater than Th3 (Th3 <Th2) and less than or equal to the threshold Th4 (Th4> Th2) is shown, information indicating the value where the temperature Tw1 or the temperature Tw2 has passed the temperature zone F is shown in the RAM 112 Store. On the other hand, abnormality determination unit 115 determines that temperature Tw does not pass through temperature zone F having threshold Th3 or more and threshold Th4 or less during a period from time t3 when operation of internal combustion engine 1 ends to time t4 when operation starts. The information that temperature Tw has not passed through temperature zone F is stored in RAM 112.

<Abnormality determination processing>
The specific flow of the abnormality determination process in the embodiment of the present invention will be described in detail with reference to FIGS. 2 and 3.

  FIG. 3 is a flowchart showing the flow of the abnormality determination process according to the embodiment of the present invention. In FIG. 3, TA is an intake air temperature sensor 130, and TW is a water temperature sensor 120.

  In the abnormality determination process shown in FIG. 3, the diagnostic machine 140 can read information stored in the RAM 112 of the ECU 110 by being connected to the ECU 110 via a connection portion (not shown) such as an OBD connector provided in the vehicle. Executed in state.

  In the process of step S1, the abnormality determination unit 144 of the CPU 143 communicates with the ECU 110, and determines whether the temperature reduction fixation check execution flag is stored in the RAM 112 or not. It is determined whether or not it has been executed. As a result of the determination, when the temperature decrease sticking check is performed, the abnormality determination unit 144 causes the abnormality determination process to proceed to step S2. On the other hand, when the temperature decrease sticking check is not performed, the abnormality determination unit 144 proceeds the abnormality determination process to step S5.

  In the process of step S2, the abnormality determination unit 144 communicates with the ECU 110, and determines whether the temperature decrease sticking check result is normal or not, thereby determining whether the information indicating that the temperature lowering sticking check result is normal is stored in the RAM 112. Is judged to be normal. As a result of the determination, if the temperature decrease sticking check result is normal, the abnormality determining unit 144 advances the abnormality determining process to step S3. On the other hand, if the temperature decrease sticking check result is abnormal, the abnormality judging unit 144 advances the abnormality judgment processing to step S8.

  In the process of step S3, the abnormality determination unit 144 communicates with the ECU 110, and determines whether the correlation check execution flag is stored in the RAM 112, whereby the abnormality determination unit 115 executes the correlation check. Determine if As a result of the determination, when the correlation check is performed, the abnormality determination unit 144 causes the abnormality determination process to proceed to step S4. On the other hand, when the correlation check is not performed, the abnormality determination unit 144 proceeds the abnormality determination process to step S5. By excluding the thermostat 48 from the determination targets, it is possible to prevent the thermostat 48 from being erroneously determined to be abnormal when either the water temperature sensor 120 or the intake air temperature sensor 130 is abnormal.

  In the process of step S4, the abnormality determination unit 144 communicates with the ECU 110, and determines whether the information indicating that the correlation check result is normal is stored in the RAM 112, whereby the correlation check result is normal. It is determined whether the As a result of the determination, if the correlation check result is normal, the abnormality determination unit 144 advances the abnormality determination process to step S5. On the other hand, when the correlation check result is abnormal, the abnormality determination unit 144 excludes the thermostat 48 from the determination targets because the correlation between the temperature Ta and the temperature Tw is not lost due to the abnormality of the thermostat 48. The abnormality determination process proceeds to step S9.

  In the process of step S5, the abnormality determination unit 144 communicates with the ECU 110, and determines whether the temperature increase fixation check execution flag is stored in the RAM 112 or not. It is determined whether or not it has been executed. As a result of the determination, when the temperature increase sticking check is executed, the abnormality determination unit 144 causes the abnormality determination process to proceed to step S6. On the other hand, when the temperature rise sticking check is not executed, the abnormality determination unit 144 proceeds the abnormality determination process to step S7.

  In the process of step S6, the abnormality determination unit 144 communicates with the ECU 110, and determines whether the temperature increase sticking check result is normal or not indicating that the information indicating that the result of the temperature increase sticking check is normal is stored in the RAM 112. It is determined whether the check result is normal. As a result of the determination, if the temperature increase sticking check result is normal, the abnormality determining unit 144 advances the abnormality determining process to step S7. On the other hand, if the temperature increase sticking check result is abnormal, the abnormality judging unit 144 advances the abnormality judgment processing to step S12.

  In the process of step S7, the abnormality determination unit 144 determines that both the water temperature sensor 120 and the intake air temperature sensor 130 are normal and the thermostat 48 is normal. Thus, the process of step S7 is completed, and the abnormality determination process ends.

  In the process of step S8, the abnormality determination unit 144 determines that the intake air temperature sensor 130 is normal and the water temperature sensor 120 is abnormal. Thus, the process of step S8 is completed, and the abnormality determination process ends.

  In the process of step S9, the abnormality determination unit 144 communicates with the ECU 110, and the temperature Tw indicated by the output of the water temperature sensor 120 has passed the predetermined temperature range F from the start of operation of the fuel engine 1 to the end of operation. It is determined whether the information indicating the value is stored in the RAM 112 or not. As a result of the determination, when the information indicating the value that has passed through the predetermined temperature zone F is stored in the RAM 112, the abnormality determination unit 144 causes the abnormality determination process to proceed to step S10. On the other hand, when the information which does not show the value which passed the predetermined temperature zone F is stored in RAM112, unusual judging part 144 advances unusual judging processing to Step S11.

  In the process of step S10, the abnormality determination unit 144 determines that the intake air temperature sensor 130 is abnormal and the water temperature sensor 120 is normal. Thus, in addition to the abnormality determination unit 144 being able to determine that at least one of the water temperature sensor 120 and the intake air temperature sensor 130 is abnormal because the result of the correlation check in step S4 is abnormal, Since the temperature Tw passes through the predetermined temperature zone F from the start of operation to the end of operation, it is possible to determine that the water temperature sensor 120 is normal and the intake temperature sensor 130 is abnormal. Thus, the process of step S10 is completed, and the abnormality determination process ends.

  In the process of step S11, the abnormality determination unit 144 determines that both the water temperature sensor 120 and the intake air temperature sensor 130 are suspected of being abnormal. Thus, the process of step S11 is completed, and the abnormality determination process ends.

  In the process of step S12, the abnormality determination unit 144 communicates with the ECU 110, and the temperature Tw indicated by the output of the water temperature sensor 120 passes the predetermined temperature range F from the start of the operation of the internal combustion engine 1 to the end of the operation. It is determined whether the information indicating the calculated value is stored in the RAM 112 or not. As a result of the determination, when the temperature Tw passes the predetermined temperature range F from the start of the operation of the internal combustion engine 1 to the end of the operation, the abnormality determination unit 144 advances the abnormality determination process to step S13. On the other hand, when the temperature Tw does not pass the predetermined temperature zone F from the start of the operation of the internal combustion engine 1 to the end of the operation, the abnormality determination unit 144 advances the abnormality determination process to step S14.

  In the process of step S13, the abnormality determination unit 144 determines that both the water temperature sensor 120 and the intake air temperature sensor 130 are normal and the thermostat 48 is abnormal. Thus, in addition to the abnormality determination unit 144 being able to determine that at least one of the water temperature sensor 120 and the thermostat 48 is abnormal because the result of the temperature increase sticking check result is abnormal in step S6, Since the temperature Tw passes through the predetermined temperature range F from the start of operation to the end of operation, it is possible to determine that the water temperature sensor 120 and the intake temperature sensor 130 are normal and the thermostat 48 is abnormal. At this time, it is considered that the thermostat 48 is stuck in an open state where the coolant is circulated through the radiator 46 without passing through the bypass passage 50. Thus, the process of step S13 is completed, and the abnormality determination process ends.

  In the process of step S14, the abnormality determination unit 144 determines that the intake air temperature sensor 130 is normal and the water temperature sensor 120 and the thermostat 48 have a suspected abnormality. Thus, the process of step S14 is completed, and the abnormality determination process ends.

  In the diagnostic machine 140 according to the present embodiment described above, when the determination result that at least one of the water temperature sensor 120 and the intake air temperature sensor 130 is abnormal, the water temperature sensor 120 from the start of operation of the internal combustion engine 1 to the end of operation. Since the water temperature sensor 120 determines that the water temperature sensor 120 is normal when the temperature Tw of the internal combustion engine 1 indicated by the output of the internal combustion engine 1 indicates a value passing through the predetermined temperature range F, the water temperature sensor detects the temperature of the internal combustion engine 1 If there is no correlation between the output of 120 and the output of the intake air temperature sensor 130 that detects the temperature of the air taken into the internal combustion engine 1, and only the intake air temperature sensor 130 is abnormal, the water temperature sensor It can be determined that 120 is normal.

  Further, in the diagnostic machine 140 in the present embodiment, when the temperature Tw of the internal combustion engine 1 indicated by the output of the water temperature sensor 120 when a predetermined time has elapsed since the start of the operation of the internal combustion engine 1 is less than the predetermined temperature It is determined that the thermostat 48 is abnormal when the temperature Tw of the internal combustion engine 1 indicated by the output of the water temperature sensor 120 shows a value passing through the predetermined temperature range F from the start of operation to the stop of operation of Therefore, when the thermostat 48 is abnormal, the water temperature sensor 120 can be prevented from being erroneously determined to be abnormal.

  Further, in the diagnostic machine 140 according to the present embodiment, when the determination result that at least one of the intake temperature sensor 130 and the water temperature sensor 120 is abnormal is obtained, the thermostat 48 is excluded from the determination target. When any of the sensor 130 and the water temperature sensor 120 is abnormal, the thermostat 48 can be prevented from being erroneously determined to be abnormal.

  The present invention is not limited to the type, shape, arrangement, number of members, etc. of the members in the above-described embodiment, and the constituent elements thereof may be appropriately replaced with ones having equivalent functions and effects without departing from the scope of the invention Of course, it can be suitably changed in the range.

  Specifically, in the above embodiment, the diagnostic machine 140 executes the abnormality determination process to determine the abnormality of the water temperature sensor 120, the intake temperature sensor 130, and the thermostat 48, but the ECU 110 executes the abnormality determination process and the water temperature sensor The abnormality of the intake air temperature sensor 130 and the thermostat 48 may be determined. In this case, the ECU 110 may execute the abnormality determination processing in the abnormality determination unit 115 of the CPU 114, and may display the determination result in the abnormality determination processing on a monitor mounted on the vehicle. Thereby, the abnormality of the water temperature sensor 120, the intake air temperature sensor 130, and the thermostat 48 can be determined without using the diagnostic machine 140.

  In the above embodiment, the temperature of the internal combustion engine 1 is detected by the water temperature sensor 120. However, in a vehicle that does not use cooling water, such as an air-cooled internal combustion engine, internal combustion is performed using a sensor other than the water temperature sensor such as an oil temperature sensor. The temperature of the engine may be detected.

  As described above, in the present invention, the correlation between the output of the first temperature sensor that detects the temperature of the internal combustion engine and the output of the second temperature sensor that detects the temperature of the air drawn into the internal combustion engine It is possible to provide an abnormality determination device capable of determining that the first temperature sensor is normal when only the second temperature sensor is abnormal in the case where there is no It is expected from the character that it can be widely applied to an abnormality determination device for a vehicle such as a motorcycle.

1 ... internal combustion engine 2 ... cylinder block 2 a ... cylinder 3 ... coolant passage 4 ... piston 5 ... connecting rod 6 ... crankshaft 7 ... reluctator 8 ... cylinder head 9 ... combustion chamber 10 ... ignition plug 11 ... intake pipe 11 a intake path 12 ... intake Valve 13 Vehicle speed sensor 14 Throttle valve 15 Exhaust pipe 15a Exhaust passage 16 Exhaust valve 42 Water pump 46 Radiator 48 Thermostat 50 Bypass passage 100 Abnormality judgment system 110 ECU
111 ... ROM
112 ... RAM
113 ... timer 114 ... CPU
115 ... abnormality determination unit 140 ... diagnostic machine 141 ... ROM
142: RAM
143: CPU
144 ... Abnormality judgment unit

Claims (3)

The output of a first temperature sensor for detecting the temperature of the internal combustion engine when a predetermined time has elapsed since the time the operation of the internal combustion engine mounted on the vehicle was stopped, and the second for detecting the temperature of air taken into the internal combustion engine Determination result that both the first temperature sensor and the second temperature sensor are normal, or the first temperature sensor and the second temperature sensor, based on the correlation with the output of the temperature sensor At least one of which is abnormal, and includes an abnormality determination unit for acquiring a determination result;
The abnormality determination unit
The temperature of the internal combustion engine indicated by the output of the first temperature sensor passes a predetermined temperature range from the start of the operation of the internal combustion engine to the end of the operation when the determination result that the at least one is abnormal is acquired If the first temperature sensor is determined to be normal if
An abnormality determination apparatus characterized in that. The first temperature sensor is
Detecting a temperature of cooling water of the internal combustion engine as a temperature of the internal combustion engine;
The abnormality determination unit
When the temperature of the internal combustion engine indicated by the output of the first temperature sensor when a predetermined time has elapsed from the start of the operation of the internal combustion engine is less than the predetermined temperature, from the start of the operation of the internal combustion engine to the stop of the operation It is determined that the thermostat is abnormal if the temperature of the internal combustion engine indicated by the output of the first temperature sensor indicates a value passing through a predetermined temperature zone.
The abnormality determination device according to claim 1, characterized in that: The abnormality determination unit
When the determination result that at least one is abnormal is acquired, the thermostat is excluded from the determination target,
The abnormality determination device according to claim 1 or 2, characterized in that:

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