JP2018076827A - Internal combustion engine control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal combustion engine control device capable of calibrating a variation of a calculation value of a temperature of an internal combustion engine caused by tolerances of various types of components in mass production of a vehicle or the like by correcting a temperature of a functional component calculated based on a resistance value of the functional component, on the basis of an atmospheric temperature of the internal combustion engine when there is a difference between the temperature of the functional component and the atmospheric temperature of the internal combustion engine.SOLUTION: An internal combustion engine control device S for controlling an operating state of an internal combustion engine on the basis of a temperature calculated from a resistance value of a coil of an injector 7 of the internal combustion engine mounted to a vehicle acquires an injector temperature and an atmospheric temperature of the internal combustion engine at cold time, calculates correction amount on the basis of a temperature difference between the injector temperature and the atmospheric temperature, calculates a correction temperature by correcting the injector temperature on the basis of the correction amount, and controls the operating state of the internal combustion engine on the basis of the correction temperature.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an internal combustion engine control device applied to a general-purpose machine such as a generator or a vehicle such as a motorcycle.

  In recent years, in general-purpose machines such as generators and vehicles such as small motorcycles, it has become difficult to meet exhaust gas regulations that will become stricter in the future with carburetor systems, so a fuel injection system has been adopted to reduce exhaust gas. Is promoted. However, since the sales price of general-purpose machines such as generators and vehicles such as small motorcycles is lower than the sales prices of vehicles such as large motorcycles and four-wheeled vehicles, such a sales price was considered. In this case, it is difficult to adopt a fuel injection system that is more expensive than a carburetor system as it is for a general-purpose machine such as a generator or a vehicle such as a small motorcycle. For this reason, in general-purpose machines such as generators and vehicles such as small motorcycles, cost reduction is required for parts related to the fuel injection system, particularly sensors.

  Here, for example, a temperature sensor in a fuel injection system is generally used for calculation of a warm-up operation state of an internal combustion engine. Specifically, the fuel injection system calculates the temperature of the internal combustion engine based on the output of the temperature sensor, detects the warm-up operation state of the internal combustion engine based on the calculated temperature of the internal combustion engine, and performs ignition. The timing and fuel injection are controlled. For this reason, when adopting a fuel injection system, it is necessary to attach a temperature sensor to the internal combustion engine. Furthermore, when installing a temperature sensor in the internal combustion engine, it is necessary to install wires and couplers for wiring, and it is necessary to process the part of the internal combustion engine in which the temperature sensor is installed. As a result, the ratio of the cost of the fuel injection system to the sales price is higher than that of the carburetor system. For this reason, in an internal combustion engine control device that controls a fuel injection system in a vehicle such as a general-purpose machine such as a generator or a small motorcycle, a temperature sensor is required to be omitted from the fuel injection system for the purpose of cost reduction. Yes.

  Under such circumstances, Patent Document 1 relates to the control device 70 of the internal combustion engine 10 and can input and output signals to and from the fuel injection valve 29 and the crank angle sensor 60 provided in or near the internal combustion engine 10. The resistance value of the coil of the valve 29 (injector coil) or the functional component of the detection coil (crank angle sensor coil) 61 of the crank angle sensor 60 is detected, and the temperature of the coil calculated from the detected resistance value is the temperature of the internal combustion engine. The configuration is disclosed.

JP 2014-206144 A

  However, according to the study of the present inventor, when the operating state of the internal combustion engine is controlled by calculating the temperature of the internal combustion engine based on the resistance value of the coil of the functional component as in the configuration of Patent Document 1, an injector or the like The calculated value of the temperature of the internal combustion engine varies due to the functional parts, the circuit configuration of the internal combustion engine control device, tolerances in mass production of the harness and the like.

  The present invention has been made through the above-described studies. When there is a difference between the temperature of the functional component and the ambient temperature of the internal combustion engine, the resistance value of the coil of the functional component is determined based on the ambient temperature of the internal combustion engine. It is an object of the present invention to provide an internal combustion engine control device that can calibrate variations in the calculated value of the temperature of an internal combustion engine due to tolerances of various components in mass production of a vehicle by correcting the temperature of a functional component calculated based on the And

  In order to achieve the above object, according to the first aspect of the present invention, the operating state of the internal combustion engine is determined based on the temperature calculated from the resistance value of the coil of the functional component of the internal combustion engine mounted on the internal combustion engine mounting body. In the internal combustion engine control device including a control unit for controlling, the control unit acquires the temperature of the functional component and the atmospheric temperature of the internal combustion engine during cold operation, and obtains the temperature of the functional component and the atmospheric temperature. An internal combustion engine control that calculates a correction amount based on the temperature difference, calculates a correction temperature obtained by correcting the temperature of the functional component based on the correction amount, and controls an operating state of the internal combustion engine based on the correction temperature Device.

  In addition to the first aspect, the present invention includes two temperature sensors respectively provided at locations where a temperature difference occurs in the internal combustion engine control device, and the control unit is acquired from the two temperature sensors. The second aspect is to calculate the correction amount when the ambient temperature is the same.

  In the third aspect of the present invention, in addition to the second aspect, the control unit obtains the temperature of the functional component at the time of obtaining the lowest temperature among the atmospheric temperatures obtained at a predetermined number of times of driving. Let it be a situation.

  In addition to the first to third aspects, the present invention sets the control unit to set a limit value for the correction amount as a fourth aspect.

  In the internal combustion engine control apparatus according to the first aspect of the present invention, the control for controlling the operating state of the internal combustion engine based on the temperature calculated from the resistance value of the coil of the functional component of the internal combustion engine mounted on the internal combustion engine mounting body. In the internal combustion engine control apparatus including the control unit, the control unit acquires the temperature of the functional component and the ambient temperature of the internal combustion engine during cold operation, and calculates a correction amount based on the temperature difference between the temperature of the functional component and the ambient temperature. Then, a correction temperature obtained by correcting the temperature of the functional component based on the correction amount is calculated, and the operation state of the internal combustion engine is controlled based on the correction temperature, so that the temperature of the functional component and the ambient temperature of the internal combustion engine are When there is a difference, the tolerances of various components in the mass production of the vehicle are corrected by correcting the temperature of the functional component calculated based on the resistance value of the coil of the functional component on the basis of the ambient temperature of the internal combustion engine. Variations in the calculated value of the temperature of the internal combustion engine due can be calibrated.

  Moreover, according to the internal combustion engine control device according to the second aspect of the present invention, the internal combustion engine control device has two temperature sensors respectively provided at locations where a temperature difference occurs in the internal combustion engine control device. Since the correction amount is calculated when the ambient temperature acquired from the temperature sensor is the same, the correction amount can be reliably calculated using the temperature of the functional component and the ambient temperature during cold operation.

  Further, according to the internal combustion engine control apparatus according to the third aspect of the present invention, the control unit acquires the temperature of the functional component at the time of acquiring the lowest temperature among the ambient temperatures acquired at the predetermined number of times of driving. Therefore, even when the vehicle is started a plurality of times, learning can be performed when the engine is in a cold state by reliably learning when the ambient temperature is the lowest.

  Further, according to the internal combustion engine control apparatus according to the fourth aspect of the present invention, the control unit sets a limit value for the correction amount, so that even if an error occurs in the learning value, an error is detected. The influence can be reduced.

FIG. 1 is a schematic 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 the flow of learning value calculation processing in the embodiment of the present invention. FIG. 3 is a flowchart showing the flow of the ambient temperature learning value update process in the embodiment of the present invention. FIG. 4A is a flowchart showing the flow of the injector temperature learning value update processing in the embodiment of the present invention, and FIG. 4B is a diagram showing the transition of the engine temperature in the embodiment of the present invention. FIG. 4C is a diagram showing the transition of the learned values of the injector temperature and the ambient temperature due to the execution of the learned value calculation process in the embodiment of the present invention.

  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.

<Configuration of internal combustion engine control device>
First, the configuration of the internal combustion engine control device in the present embodiment will be described with reference to FIG. The internal combustion engine control device in the present embodiment is typically suitably mounted on an internal combustion engine mounting body such as a general-purpose machine such as a generator or a vehicle such as a motorcycle. The internal combustion engine control device will be described as being mounted on a vehicle such as a motorcycle.

  FIG. 1 is a schematic diagram showing a configuration of an internal combustion engine control apparatus according to an embodiment of the present invention.

  As shown in FIG. 1, the internal combustion engine control device 1 in this embodiment is based on the temperature of functional parts of an engine that is an internal combustion engine such as a gasoline engine mounted on a vehicle (not shown). The electronic control unit (Electronic Control Unit: ECU) 10 is provided.

  The ECU 10 operates using the electric power from the battery B mounted on the vehicle, and the waveform shaping circuit 11, the thermistor element 12, the A / D converter 13, the ignition circuit 14, the drive circuit 15, and the resistance value detection. Circuit 16, EEPROM (Electrically Erasable Programmable Read-Only Memory) 17, ROM (Read-Only Memory) 18, RAM (Random Access Memory) 19, Timer 20, Central Processing Unit (Central CPU 21) I have. Each component of the ECU 10 is accommodated in a casing 10a of the ECU 10. Also, typically, the ECU 10 and the engine are in contact with the outside air, and the ECU 10 is arranged away from the engine 10 so as not to be affected by the radiant heat of the engine and the heat transfer from the engine. Is.

  The waveform shaping circuit 11 shapes a crank pulse signal corresponding to the rotation angle of the crankshaft 3 of the engine output from the crank angle sensor 2 to generate a digital pulse signal. The waveform shaping circuit 11 outputs the digital pulse signal thus generated to the CPU 21.

  The thermistor element 12a is a chip disposed in a region having the highest temperature in the casing 10a of the ECU 10 (typically, a region close to the heating element having a distance to the heating element as the ignition circuit 14 of about several millimeters). The thermistor, which exhibits an electrical resistance value corresponding to the ambient temperature in the region, outputs an electrical signal indicating a voltage corresponding to the electrical resistance value to the A / D converter 13. The thermistor element 12a may be replaced with another temperature sensor such as a thermocouple as long as such an electrical signal can be output.

  The thermistor element 12b is a region (typically a housing) that is close to the ambient air temperature (outside air temperature) outside the housing 10a of the ECU 10, that is, the ambient air temperature (outside air temperature) around the engine. A chip thermistor disposed in a region close to the housing 10a having a distance of about several millimeters to the body 10a, and exhibits an electrical resistance value corresponding to the ambient temperature of the region and a voltage corresponding to the electrical resistance value Is output to the A / D converter 13. The temperature detected by the thermistor element 12b is equal to the ambient temperature which is the ambient temperature around the engine. The thermistor element 12b may be replaced with another temperature sensor such as a thermocouple as long as it can output such an electrical signal.

  The thermistor element 12a and the thermistor element 12b are respectively provided in the internal combustion engine control device 1 where a temperature difference occurs. Since the thermistor element 12a and the thermistor element 12b are arranged on a circuit board (not shown) like other components of the ECU 10, a separate wiring is provided, and the thermistor element 12a and the thermistor 12b are electrically connected via this. There is no need to do.

  The A / D converter 13 is an electric signal indicating the opening degree of the throttle valve of the engine output from the throttle opening degree sensor 4 and an electric signal indicating the oxygen concentration in the atmosphere sucked into the engine output from the oxygen sensor 5. The electrical signals output from the thermistor elements 12a and 12b are converted from an analog form to a digital form, respectively. The A / D converter 13 outputs these electrical signals thus converted into digital form to the CPU 21.

  The ignition circuit 14 includes a switching element such as a transistor that is controlled to be turned on / off in accordance with a control signal from the CPU 21. When the switching element is turned on / off, the fuel in the engine is passed through a spark plug (not shown). And the operation of the ignition coil 6 for generating a secondary voltage for igniting the air-fuel mixture. The ignition circuit 14 is typically a driver IC (Integrated Circuit) that is a semiconductor element, and is a component that generates the largest amount of heat in the housing 10a.

  The drive circuit 15 includes a switching element such as a transistor that is controlled to be turned on / off in accordance with a control signal from the CPU 21, and the switching element is turned on / off to energize / coil the coil of the injector 7 that supplies fuel to the engine. Switch the non-energized state. Here, the injector 7 is attached to an intake pipe or a cylinder head (not shown) of the engine, and heat generated from the engine is transferred. In particular, the coil of the injector 7 is a component for electrically driving the solenoid of the injector 7, and fuel is ejected from the injector 7 when the solenoid operates while the coil is energized.

  The resistance value detection circuit 16 measures an electrical resistance value (resistance value) that is a physical quantity that varies depending on the electrical resistance component of the coil of the injector 7, and outputs an electrical signal indicating the measured resistance value to the CPU 21. To do.

  The EEPROM 17 stores data related to various learning values such as an atmospheric temperature learning value and an injector temperature learning value. Note that the EEPROM 17 may be replaced with another storage medium such as a data flash as long as it can store data relating to such various learning values.

  The ROM 18 is configured by a nonvolatile storage device, and is used for a control program for engine temperature calculation processing, data related to an injector temperature table used in the engine temperature calculation processing, a control program for ambient temperature calculation processing, and a learning value calculation processing. Various control data such as control programs are stored.

  The RAM 19 is configured by a volatile storage device and functions as a working area for the CPU 21.

  The timer 20 performs a time measurement process according to a control signal from the CPU 21.

  CPU21 as a control part controls operation | movement of ECU10 whole. The CPU 21 detects the resistance value of the coil of the injector 7 through the resistance value detection circuit 16 by executing a control program for engine temperature calculation processing stored in the ROM 18, and the resistance value of the coil of the injector 7. The injector temperature corresponding to the detected coil resistance value of the injector 7 is calculated as the engine temperature (engine temperature) from the injector temperature table showing the relationship between the injector temperature and the injector temperature.

  The CPU 21 executes the control program for the ambient temperature calculation process stored in the ROM 18, and based on the voltage indicated by the electrical signal input from the thermistor element 12 a and the thermistor element 12 b via the A / D converter 13. Thus, the ambient temperature of each region where the thermistor element 12a and the thermistor element 12b are arranged is calculated.

  The CPU 21 executes a control program for learning value calculation processing stored in the ROM 18 to correct the injector temperature calculated as described above with reference to the ambient temperature calculated as described above. Calibrate the variation in the calculated engine temperature due to component tolerances. The CPU 21 uses the corrected injector temperature as an engine temperature, and controls the ignition circuit 14 and the drive circuit 15 based on the engine temperature, thereby controlling the operating state of the engine.

  Here, the present inventor has a plurality of correlation characteristics that define the relationship between the value of the temperature of the injector 7 (injector temperature), which is a functional component of the engine, and the value of the temperature of the engine (engine temperature) on which the injector 7 is mounted. When the curve was measured and the relationship between them was examined, the following knowledge was obtained. Note that the plurality of correlation characteristic curves are measured under the same operating conditions of the engine in an environment where the ambient temperature at the start of engine operation is different. Further, the plurality of correlation characteristic curves can be obtained in the same manner even when the operating state of the engine is varied.

  That is, according to the study by the present inventors, in each correlation characteristic curve, the initial value of the injector temperature Tinj (the value of the injector temperature Tinj at the start of engine operation) and the initial value of the engine temperature Teng (the start time of engine operation) Of the engine temperature Teng of the engine), and these define the initial coordinate point (the coordinate point at the start of engine operation) at which the value of the injector temperature Tinj and the value of the engine temperature Teng each have the smallest value. As the engine is operated and its operating state continues, each correlation characteristic curve shows that the value of the engine temperature Teng increases as the value of the injector temperature Tinj increases from the initial coordinate point. It was found that both non-linearly increasing profiles exhibit the same correlation characteristics. The meaning that the profiles of the correlation characteristic curves are the same means that they can be treated as practically the same (substantially the same) when the engine is operated and its operating state continues.

  The reason why the initial value of the injector temperature Tinj is equal to the initial value of the engine temperature Teng at the initial coordinate point of each correlation characteristic curve is the time when engine combustion starts at the start of engine operation, and its heat generation This is because the temperature of the engine and the injector does not rise due to the above, and both of these initial values are equal to the ambient temperature at the start of engine operation. Further, at the initial coordinate point of each correlation characteristic curve, the detected temperature (thermistor temperature Tthr) detected by the thermistor element 12 becomes equal to the initial value of the injector temperature Tinj and the initial value of the engine temperature Teng. It is equal to the engine ambient temperature. That is, in each correlation characteristic curve, the initial value of the injector temperature Tinj is equal to the initial value of the thermistor temperature Tthr, and thus the initial value of the injector temperature Tinj and the engine temperature equal to the initial value of the thermistor temperature Tthr. The initial values of Teng form their initial coordinate points.

  Furthermore, when the operation of the engine is started, the engine temperature Teng rises due to the heat generated by the engine, and the heat generated by the engine is transferred through components such as the metal of the engine to increase the injector temperature Tinj. Here, in each correlation characteristic curve, as the engine is operated and its operation state continues, the values of the injector temperature Tinj and the engine temperature Teng both increase from their initial coordinate points. However, the reason why they exhibit the same correlation characteristics regardless of the operating conditions of the engine is that the engine temperature Teng is caused by the heat generation of the engine even if the heat generation state of the engine is different due to the different operating conditions of the engine. This is because the relationship between the time-varying state in which the temperature rises and the time-varying state in which the heat generated by the engine is transferred to increase the injector temperature Tinj are equal to each other.

  From the above examination results by the present inventor, it has been found that in the plurality of correlation characteristic curves, the respective initial coordinate points are different and the respective profiles are substantially the same. Without considering multiple correlation characteristic curves, a single reference correlation is used for a typical correlation characteristic curve with a predetermined reference ambient temperature as the initial coordinate point while considering the difference in the ambient temperature at the start of engine operation. It can be seen that it is sufficient to use it as a characteristic curve. Therefore, as described above, the injector temperature can be estimated as the engine temperature.

  In addition, as a temperature of the functional component of the engine, an injector temperature can be cited as a suitable example from the viewpoint of the simplicity of measurement and the like, but as the functional component of the engine, heat generated in the engine is transferred as in the case of the injector. Any other functional equipment can be used, and the temperature of the functional component may be used as the temperature of the functional component of the engine.

  The counter 22 performs a counting process according to the control of the CPU 21.

  The internal combustion engine control device 1 having such a configuration calculates learning values for the atmospheric temperature and the injector temperature by executing the learning value calculation process described below. Hereinafter, the learning value calculation process in the present embodiment will be described more specifically.

<Learning value calculation processing>
With reference to FIG.2 and FIG.4 (b), the specific flow of the learning value calculation process in this embodiment is demonstrated in detail.

  FIG. 2 is a flowchart showing the flow of learning value calculation processing in the embodiment of the present invention. FIG. 4B is a diagram showing a transition of the engine temperature in the embodiment of the present invention. In FIG. 4B, “Off” indicates that the start of the vehicle is stopped, and “travel” indicates that the vehicle is started.

  The flowchart shown in FIG. 2 starts at the timing when the ECU 1 is operated after the ignition switch of the vehicle is switched from the off state to the on state, and the learning value calculation process proceeds to the process of step S1. Such learning value calculation processing is executed when the user of the vehicle uses the vehicle.

  In the process of step S1, the CPU 21 determines whether or not the learning execution completion flag has been set. As a result of the determination, when the learning execution completion flag has been set, the CPU 21 ends the learning value calculation process. On the other hand, when the learning execution completion flag is not set, the CPU 21 advances the learning value calculation process to the process of step S2.

  In the process of step S2, the CPU 21 calculates the ambient temperature calculated based on the voltage indicated by the electrical signal input from the thermistor element 12a and the thermistor element 12b via the A / D converter 13, and the resistance value detection circuit 16 It is determined whether or not the calculated value of the injector temperature calculated based on the resistance value indicated by the electric signal input from is stable. The CPU 21 typically calculates each of the ambient temperature and the injector temperature by determining whether or not each fluctuation range of the calculated value of the ambient temperature and the calculated value of the injector temperature for a predetermined time is equal to or less than a predetermined value. Determine whether the value is stable. As a result of the determination, if the calculated values of the atmospheric temperature and the injector temperature are not stable, the CPU 21 ends the learning value calculation process. On the other hand, when the calculated values of the ambient temperature and the injector temperature are stable, the CPU 21 advances the learning value calculation process to the process of step S3.

  In the process of step S <b> 3, the CPU 21 uses the counter 22 to increment the learning execution count value. Thereby, the process of step S3 is completed, and the learning value calculation process proceeds to the process of step S4.

  In the process of step S4, the CPU 21 calculates the median value C1 between the ambient temperature of the region where the thermistor element 12a calculated this time is arranged and the ambient temperature of the region where the thermistor element 12b calculated this time is arranged. . Here, the median is an average value of the ambient temperature in the region where the thermistor element 12a is disposed and the ambient temperature in the region where the thermistor element 12b is disposed. Thereby, the process of step S4 is completed, and the learning value calculation process proceeds to the process of step S5.

  In the process of step S5, the CPU 21 calculates the median value of the ambient temperature of the region where the thermistor element 12a stored in the EEPROM 17 is disposed and the ambient temperature of the region where the thermistor element 12b stored in the EEPROM 17 is disposed. C2 is calculated. Thereby, the process of step S5 is completed, and the learning value calculation process proceeds to the process of step S6.

  In the process of step S6, the CPU 21 determines whether or not the median value C1 is smaller than the median value C2. As a result of the determination, when the median value C1 is smaller than the median value C2, the CPU 21 advances the learning value calculation process to the process of step S7. On the other hand, when the median value C1 is equal to or greater than the median value C2, the CPU 21 advances the learning value calculation process to the process of step S9.

  In the process of step S7, the CPU 21 determines whether or not the injector temperature T1 calculated this time is smaller than the injector temperature T2 stored in the EEPROM 17. As a result of the determination, when the injector temperature T1 is lower than the injector temperature T2, the CPU 21 advances the learning value calculation process to the process of step S8. On the other hand, when the injector temperature T1 is equal to or higher than the injector temperature T2, the CPU 21 advances the learning value calculation process to the process of step S9.

  In the process of step S8, the CPU 21 calculates the ambient temperatures of the region where the thermistor element 12a and the region where the thermistor element 12b are calculated, which are calculated this time, as the ambient temperatures stored in the EEPROM 17, respectively. Overwriting and updating, the injector temperature T1 calculated this time is overwritten on the injector temperature T2 stored in the EEPROM 17, and the injector temperature T2 is updated. Thereby, the process of step S8 is completed, and the learning value calculation process proceeds to the process of step S9.

  In the process of step S9, the CPU 21 refers to the count value of the counter 22 and determines whether or not the number of times of learning is a predetermined number or more. As a result of the determination, if the number of times of learning is equal to or greater than the predetermined number, the CPU 21 advances the learning value calculation process to the process of step S10. On the other hand, when the number of times of learning is less than the predetermined number, the CPU 21 advances the learning value calculation process to the process of step S15.

  The predetermined number of times compared with the number of times of learning is typically a predetermined number of driving times. Here, the number of times of driving is a period from turning on the power to the internal combustion engine control device 1 when the ignition switch is turned on until turning off the power to the internal combustion engine control device 1 when the ignition switch is turned off.

  As described above, when the ambient temperature and injector temperature calculated this time are lower than the previous ambient temperature and injector temperature stored in the EEPROM 17, the currently calculated ambient temperature and injector temperature are overwritten. By updating, it is possible to acquire the lowest temperature among the ambient temperatures acquired at a predetermined number of driving times and the injector temperature at the time of acquiring the lowest temperature. Thereby, for example, as shown in FIG. 4B, the CPU 21 is in the cold state at the time t = tx when the engine temperature becomes the lowest temperature even when the vehicle is intermittently started at short intervals. Atmospheric temperature and injector temperature can be obtained. Here, the time t = tx at which the engine temperature reaches the lowest temperature is typically the time before starting the vehicle in the morning time zone of the day.

  In the process of step S10, the CPU 21 calculates the median value of the ambient temperature of the region where the thermistor element 12a stored in the EEPROM 17 is disposed and the ambient temperature of the region where the thermistor element 12b stored in the EEPROM 17 is disposed. C3 is calculated. Thereby, the process of step S10 is completed, and the learning value calculation process proceeds to the process of step S11.

  In the process of step S11, the CPU 21 executes an ambient temperature learning value update process. The atmosphere temperature learning value update process will be described later.

  Thereby, the process of step S11 is completed, and the learning value calculation process proceeds to the process of step S12.

  In the process of step S12, the CPU 21 executes an injector temperature learning value update process. The injector temperature learning value update process will be described later.

  Thereby, the process of step S12 is completed, and the learning value calculation process proceeds to the process of step S13.

  In the process of step S13, the CPU 21 clears the atmospheric temperature, the injector temperature, and the number of times of learning stored in the EEPROM 17. Thereby, the process of step S13 is completed, and the learning value calculation process proceeds to the process of step S14.

  In the process of step S14, the CPU 21 sets a learning execution completion flag. Thereby, the process of step S14 is completed and a learning value calculation process is complete | finished.

  In the processing of step S15, the CPU 21 writes the count value of the number of times of learning incremented in step S3 in the EEPROM 17. Thereby, the process of step S15 is completed, and the learning value calculation process proceeds to the process of step S14.

<Atmosphere temperature learning value update processing>
In the learning value calculation process, the atmospheric temperature learning value update process for updating the learning value of the atmospheric temperature is executed. Hereinafter, with reference to FIG. 3, a specific flow of the atmospheric temperature learning value update process in the present embodiment will be described in detail.

  FIG. 3 is a flowchart showing the flow of the thermistor temperature learning value update process in the embodiment of the present invention.

  The flowchart shown in FIG. 3 starts at the timing when the process of step S10 in the learning value calculation process shown in FIG. 2 is completed, and the ambient temperature learning value update process proceeds to the process of step S21.

  In the process of step S21, the CPU 21 determines whether or not the learning value convergence flag has been set. If the learning value convergence flag has already been set as a result of the determination, the CPU 21 ends the ambient temperature learning value update process. On the other hand, when the learning value convergence flag is not set, the CPU 21 advances the ambient temperature learning value update process to the process of step S22.

  In the process of step S22, the CPU 21 subtracts the ambient temperature of the region where the thermistor element 12b is disposed from the ambient temperature of the region where the thermistor element 12a updated in step S8 of FIG. Divide by 2 ”to calculate the atmospheric temperature learning value update amount. Thereby, the process of step S22 is completed and the ambient temperature learning value update process proceeds to the process of step S23.

  In the process of step S23, the CPU 21 determines whether or not the ambient temperature learning value update amount is less than the ambient temperature update limit amount. As a result of the determination, if the atmosphere temperature learning value update amount is less than the atmosphere temperature limit amount, the CPU 21 advances the atmosphere temperature learning value update process to the process of step S24. On the other hand, when the atmospheric temperature learning value update amount is equal to or larger than the atmospheric temperature limit amount, the CPU 21 advances the atmospheric temperature learning value update process to the process of step S26.

  In the process of step S <b> 24, the CPU 21 calculates a new ambient temperature learning value A by adding the ambient temperature learning value update amount to the previous ambient temperature learning value A stored in the EEPROM 17. Here, the ambient temperature learning value A is a learning value of the ambient temperature in the region where the thermistor element 12a is disposed. Thereby, the process of step S24 is completed and the ambient temperature learning value update process proceeds to the process of step S25.

  In the process of step S <b> 25, the CPU 21 calculates a new ambient temperature learned value B by adding the ambient temperature learned value update amount to the previous ambient temperature learned value B stored in the EEPROM 17. Here, the ambient temperature learning value B is a learning value of the ambient temperature in the region where the thermistor element 12b is disposed. Thereby, the process of step S25 is completed, and the ambient temperature learning value update process proceeds to the process of step S28.

  In the process of step S <b> 26, the CPU 21 calculates a new ambient temperature learning value A by adding the ambient temperature update limit amount to the previous ambient temperature learning value A stored in the EEPROM 17. Thereby, the process of step S26 is completed and the ambient temperature learning value update process proceeds to the process of step S27.

  In the process of step S <b> 27, the CPU 21 calculates a new ambient temperature learned value B by adding the ambient temperature update limit amount to the previous ambient temperature learned value B stored in the EEPROM 17. Thereby, the process of step S27 is completed, and the ambient temperature learning value update process proceeds to the process of step S28.

  In the process of step S <b> 28, the CPU 21 writes the newly calculated ambient temperature learned value A and ambient temperature learned value B into the EEPROM 17. Thereby, the process of step S28 is completed, and the ambient temperature learning value update process proceeds to the process of step S29.

  In the process of step S29, when the CPU 21 repeatedly executes the ambient temperature learning value update process, the difference between the previous ambient temperature learned value A and the newly calculated ambient temperature learned value A, or the previous ambient temperature learned value. It is determined whether or not the integrated amount of the difference between B and the newly calculated ambient temperature learning value B is less than the learning convergence determination amount. As a result of the determination, if the integrated amount is less than the learning convergence determination amount, the CPU 21 advances the ambient temperature learning value update process to the process of step S30. On the other hand, when the integrated amount is equal to or greater than the learning convergence determination amount, the CPU 21 advances the ambient temperature learned value update process to the process of step S34.

  In the process of step S30, the CPU 21 increments the count value of the learning value convergence determination count counted by the counter 22. Thereby, the process of step S30 is completed, and the ambient temperature learning value update process proceeds to the process of step S31.

  In the process of step S31, the CPU 21 refers to the count value of the counter 22 and determines whether or not the learning value convergence determination number is equal to or greater than a predetermined number. As a result of the determination, if the number of learning value convergence determination times is equal to or greater than the predetermined number, the CPU 21 advances the ambient temperature learning value update process to the process of step S32. On the other hand, when the learning value convergence determination number is less than the predetermined number, the CPU 21 ends the atmosphere temperature learning value update process.

  In the process of step S32, the CPU 21 sets a learning value convergence flag. Thereby, the process of step S32 is completed, and the ambient temperature learning value update process proceeds to the process of step S33.

  In the process of step S <b> 33, the CPU 21 writes a learning value convergence flag in the EEPROM 17. Thereby, the process of step S33 is completed and the ambient temperature learning value update process is terminated.

  In the process of step S34, the CPU 21 resets the count value of the counter 22 that counts the learning value convergence determination count. Thereby, the process of step S34 is completed and the ambient temperature learning value update process is terminated.

<Injector temperature learning value update processing>
In the learning value calculation process described above, an injector temperature learning value update process for updating the learning value of the injector temperature is executed. Hereinafter, with reference to FIG. 4A and FIG. 4C, a specific flow of the injector temperature learning value update processing in the present embodiment will be described in detail.

  FIG. 4A is a flowchart showing a flow of injector temperature learning value update processing in the embodiment of the present invention. FIG. 4C is a diagram showing the transition of the learned values of the injector temperature and the ambient temperature due to the execution of the learned value calculation process in the embodiment of the present invention.

  The flowchart shown in FIG. 4A starts when the atmosphere temperature learning value update process shown in FIG. 3 ends, and the injector temperature learning value update process proceeds to step S41.

  In the process of step S41, the CPU 21 subtracts the subtraction value obtained by subtracting the atmospheric temperature learning value B written in the EEPROM 17 in step S28 of FIG. 3 from the atmospheric temperature learning value A written in the EEPROM 17 in step S28 of FIG. It is determined whether or not the absolute value is less than or equal to the learning execution limit amount.

  Here, the learning execution limit amount is typically “0”. By setting the learning execution limit amount to “0”, it is possible to obtain the injector temperature learning value update amount when the ambient temperature of each region where the two thermistor elements 12a and the thermistor elements 12b are arranged is the same. In addition, the correction amount can be calculated using the temperature of the functional component and the ambient temperature during cold operation.

  As a result of the determination, if the absolute value of the calculated subtraction value is larger than the learning execution limit amount, the CPU 21 ends the injector temperature learning value update process. On the other hand, when the absolute value of the obtained subtraction value is less than or equal to the learning execution limit amount, the CPU 21 advances the injector temperature learning value update process to the process of step S42.

  In the process of step S42, the CPU 21 subtracts the median value C3 of the ambient temperature calculated in step S10 of FIG. 2 from the injector temperature T2 updated in step S8 of FIG. 2 to learn the injector temperature as a correction amount. Find the value update amount. Thereby, the process of step S42 is completed, and the injector temperature learning value update process proceeds to the process of step S43.

  In the process of step S43, the CPU 21 determines whether or not the injector temperature learning value update amount is less than the injector temperature update limit amount ΔTlim. As a result of the determination, when the injector temperature learning value update amount is less than the injector temperature update limit amount ΔTlim, the CPU 21 advances the injector temperature learning value update processing to the processing of step S44. On the other hand, when the injector temperature learned value update amount is equal to or greater than the injector temperature update limit amount ΔTlim, the CPU 21 advances the injector temperature learned value update process to the process of step S46.

  In the process of step S44, the CPU 21 corrects the previous injector temperature learned value Trfdf by adding the injector temperature learned value update amount to the previous injector temperature learned value Trfdf stored in the EEPROM 17, and a new injector is used as the corrected temperature. A temperature learning value Trfdf is obtained. Thereby, the process of step S44 is completed, and the injector temperature learning value update process proceeds to the process of step S45.

  In the process of step S45, the CPU 21 writes the newly determined injector temperature learning value Trfdf in the EEPROM 17. Thereby, the process of step S44 is completed and the injector temperature learning value update process ends.

  In the process of step S46, the CPU 21 obtains a new injector temperature learning value Trfdf by adding the injector temperature update limit amount ΔTlim to the previous injector temperature learning value Trfdf stored in the EEPROM 17. As described above, the injector temperature learning value update amount is set to the injector temperature update limit amount ΔTlim as the limit value, and the previous injector temperature learning value Trfdf is corrected to cause an error in the learning value. Can also reduce the effect of errors.

  Thereby, the process of step S46 is completed, and the injector temperature learning value update process proceeds to the process of step S45.

  By using the injector temperature learning value Trfdf calculated in this way as the engine temperature, the variation in the calculated engine temperature can be calibrated.

  Specifically, the uncorrected injector temperature Tref obtained by the CPU 21 is updated as described above when the median value C3 is lower than the injector temperature learning value Trfdf, as shown in FIG. By repeating the processing, it gradually approaches the median value C3 from time t0. FIG. 4C shows an example in which the injector temperature update limit amount ΔTlim is added to the uncorrected injector temperature Tref or the previous injector temperature learning value Trfdf.

  At this time, since the correction is performed with the correction amount equal to or smaller than the injector temperature update limit amount ΔTlim, the injector temperature learning value Trfdf and the median value C3 do not approach rapidly, but the temporarily inaccurate median value C3 and injector Even if the injector temperature learning value Trfdf is corrected by comparison with the temperature T2, the influence on the injector temperature learning value Trfdf can be minimized.

  In FIG. 4C, when the injector temperature learning value Trfdf coincides with the median value C3 at time t = t5, the CPU 21 varies the calculated value of the functional component temperature due to tolerances of various components in the mass production of the vehicle. Can be calibrated.

  In the internal combustion engine control device in the present embodiment described above, the correction amount is calculated based on the temperature difference between the injector temperature and the ambient temperature during cold operation, the correction temperature is calculated by correcting the injector temperature based on the correction amount, and the correction is performed. Since the operation state of the internal combustion engine is controlled based on the temperature, when there is a difference between the injector temperature and the atmospheric temperature of the internal combustion engine, the resistance value of the coil of the injector is based on the atmospheric temperature of the internal combustion engine. By correcting the injector temperature calculated in this way, it is possible to calibrate variations in the calculated value of the temperature of the internal combustion engine due to tolerances of various components in mass production of the vehicle.

  Further, in the internal combustion engine control apparatus according to the present embodiment, when the ambient temperature acquired from the two thermistor elements 12a and the thermistor elements 12b provided at the locations where the temperature difference occurs in the internal combustion engine control apparatus S is the same, the injector Since the temperature learning value update amount is calculated, it is possible to reliably acquire the injector temperature and the ambient temperature during cold operation.

  In the internal combustion engine control apparatus according to the present embodiment, the temperature of the functional component at the time of acquisition of the lowest temperature among the ambient temperatures acquired at a predetermined number of times of driving is acquired, so that the vehicle is started a plurality of times. Even when the engine temperature is low, learning can be performed when the engine is in a cold state by learning when the ambient temperature is the lowest.

  Further, in the internal combustion engine control apparatus according to the present embodiment, since a limit value is set for the correction amount, even if an error occurs in the learning value, the influence of the error can be reduced.

  In the present invention, the type, shape, arrangement, number, etc. of the members are not limited to the above-described embodiments, and the constituent elements thereof are appropriately replaced with those having the same operational effects, etc. Of course, it can be changed as appropriate within range 2.

  As described above, in the present invention, when there is a difference between the temperature of the functional component and the atmospheric temperature of the internal combustion engine, the function calculated based on the resistance value of the coil of the functional component on the basis of the atmospheric temperature of the internal combustion engine. By correcting the temperature of the parts, it is possible to provide an internal combustion engine control device that can calibrate variations in the calculated values of functional parts due to tolerances of various components in mass production of vehicles. Therefore, it is expected to be widely applicable to internal combustion engine control devices such as motorcycles.

DESCRIPTION OF SYMBOLS 1 ... Internal combustion engine control apparatus 2 ... Crank angle sensor 3 ... Crankshaft 4 ... Throttle opening sensor 5 ... Oxygen sensor 6 ... Ignition coil 7 ... Injector 10 ... ECU
DESCRIPTION OF SYMBOLS 10a ... Case 11 ... Waveform shaping circuit 12a ... Thermistor element 12b ... Thermistor element 13 ... A / D converter 14 ... Ignition circuit 15 ... Drive circuit 16 ... Resistance value detection circuit 17 ... EEPROM
18 ... ROM
19 ... RAM
20 ... Timer 21 ... CPU
22 ... Counter B ... Battery

Claims (4)

In an internal combustion engine control device comprising a control unit for controlling an operating state of the internal combustion engine based on a temperature calculated from a resistance value of a coil of a functional component of the internal combustion engine mounted on the internal combustion engine mounting body,
The controller is
Obtaining the temperature of the functional component and the ambient temperature of the internal combustion engine during cold operation, calculating a correction amount based on the temperature difference between the temperature of the functional component and the ambient temperature, and based on the correction amount Calculating a correction temperature obtained by correcting the temperature of the functional component, and controlling an operating state of the internal combustion engine based on the correction temperature;
An internal combustion engine control device. Two temperature sensors respectively provided at locations where a temperature difference occurs in the internal combustion engine control device;
The controller is
When the ambient temperature acquired from the two temperature sensors is the same, the correction amount is calculated.
The internal combustion engine control apparatus according to claim 1. The controller is
Obtaining the temperature of the functional component at the time of obtaining the lowest temperature among the ambient temperatures obtained at a predetermined number of driving times;
The internal combustion engine control apparatus according to claim 2, wherein: The controller is
Setting a limit value for the correction amount;
The internal combustion engine control device according to any one of claims 1 to 3, wherein

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