JP2017121844A - On-vehicle generator monitoring apparatus, on-vehicle generator monitoring system, and on-vehicle generator monitoring method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle generator monitoring apparatus, an on-vehicle generator monitoring system, and an on-vehicle generator monitoring method, which are capable of monitoring abnormality, deterioration or the like of a generator without adding new hardware, component or the like.SOLUTION: An on-vehicle generator monitoring apparatus 8 performs: calculating a total value of a current value Ib detected by a current detection part 7 and current values Id0-Id2 detected by switches 11a-11c, thus obtaining an output current value Ia of a generator 2; obtaining a rotation speed N of the generator 2 and an output voltage value V of the generator 2 detected by a voltage detection part 6; and storing a correlation between a rotation speed of the generator 2 and generated power at a normal operation time, and comparing between an upper limit value and a lower limit value determined in accordance with generated power P0 at the normal operation time corresponding to the obtained rotation speed N, thus determining abnormality.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an in-vehicle generator monitoring device, an in-vehicle generator monitoring system, and an in-vehicle generator monitoring method for monitoring the presence or absence of abnormality or deterioration of a generator mounted on a vehicle.

  A vehicle is equipped with a generator that generates electric power by rotating an engine, and electric power generated by the generator is supplied to a battery, an on-vehicle load, and the like. When abnormality or deterioration occurs in this generator, there is a risk that the power supply to the on-vehicle load is interrupted or reduced. For this reason, it is desirable to detect abnormality or deterioration of the generator at an early stage.

  Patent Document 1 proposes a vehicle charging system abnormality alarm device that issues an abnormality alarm in a vehicle charging system that includes an alternator that generates power using engine driving force and a battery that is charged by the alternator. . This charging system abnormality alarm device includes a measuring means for measuring the output current of the alternator, a means for detecting the rotational speed of the alternator, a computing means for calculating a theoretical output current value of the alternator corresponding to the rotational speed, and a predetermined rotational speed. Comparing means that sometimes compares the measured value of the output current with the logical value, and alarm means that issues an alarm according to the comparison result are provided.

JP-A-60-152236

  In the charging system abnormality alarm device described in Patent Document 1, it is necessary to provide means for measuring the output current of the alternator in the power supply path from the output terminal of the alternator to the branch to the battery and the on-vehicle load. Since there is no means for current measurement in the conventional vehicle at this location, it is necessary to add new hardware or parts.

  The present invention has been made in view of such circumstances, and the object of the present invention is to make use of hardware or parts mounted on an existing vehicle to obtain new hardware or parts. It is an object of the present invention to provide an in-vehicle generator monitoring device, an in-vehicle generator monitoring system, and an in-vehicle generator monitoring method that can monitor abnormality or deterioration of the generator without adding.

  A vehicle-mounted generator monitoring device according to the present invention includes a first current value acquisition unit that acquires a current value detected by a battery current detection unit that detects a current value flowing from a generator mounted on a vehicle to a battery, and the generator A second current value acquisition unit that acquires a current value detected by a load current detection unit that is provided in a current path from one to a plurality of in-vehicle loads and detects a current value flowing to the in-vehicle load; and the first current value A total current value calculation unit that calculates a current value acquired by the acquisition unit and a total current value of the current values acquired by the second current value acquisition unit; a rotation speed acquisition unit that acquires the rotation speed of the generator; And a determination unit that determines abnormality of the generator according to the total current value calculated by the total current value calculation unit and the rotation number acquired by the rotation number acquisition unit.

  The on-vehicle generator monitoring device according to the present invention includes a voltage value acquisition unit that acquires a voltage value detected by a voltage detection unit that detects an output voltage value of the generator, and the determination unit includes the total current value. By comparing the generated power amount of the generator determined based on the total current value calculated by the calculation unit and the voltage value acquired by the voltage acquisition unit with a threshold value determined according to the rotation number acquired by the rotation speed acquisition unit An abnormality of the generator is determined.

  The on-vehicle generator monitoring device according to the present invention further includes a storage unit that stores a correspondence relationship between the number of rotations and the amount of generated power when the generator is operating normally, and the determination unit includes the total current The power generation amount of the generator determined based on the total current value calculated by the value calculation unit and the voltage value acquired by the voltage acquisition unit, the rotation speed acquired by the rotation speed acquisition unit, and the correspondence stored in the storage unit The abnormality of the generator is determined by comparison with a threshold value determined according to the relationship.

  In the in-vehicle generator monitoring device according to the present invention, the load current detection unit is provided in a switch that switches between connection / cutoff of the current path by being arranged in a current path from the generator to the in-vehicle load. The determination unit performs determination based on a plurality of conditions with different connection / cutoff states of the switch, and determines abnormality of the generator based on a plurality of determination results.

  In addition, an on-vehicle generator monitoring system according to the present invention includes a battery current detection unit that detects a current value flowing from a generator mounted on a vehicle to a battery, and a current path from the generator to one or more on-vehicle loads. A load current detection unit that detects a current value flowing to the in-vehicle load, a first current value acquisition unit that acquires a current value detected by the battery current detection unit, and a current value detected by the load current detection unit. A second current value acquisition unit to acquire, a total current value calculation unit to calculate a current value acquired by the first current value acquisition unit and a current value acquired by the second current value acquisition unit, the generator And a determination unit that determines abnormality of the generator according to the total current value calculated by the total current value calculation unit and the rotation number acquired by the rotation number acquisition unit. In-vehicle generator with Characterized in that it comprises a visual device.

  In addition, the on-vehicle generator monitoring method according to the present invention acquires a current value detected by a battery current detection unit that detects a current value flowing from a generator mounted on a vehicle to a battery, and one or a plurality of the current values are detected from the generator. A current value detected by a load current detection unit that is provided in a current path to the in-vehicle load and detects a current value flowing to the in-vehicle load is acquired, and from the current value acquired from the battery current detection unit and the load current detection unit A total current value of the acquired current values is calculated, the rotation speed of the generator is acquired, and abnormality of the generator is determined according to the calculated total current value and the acquired rotation speed.

In the present invention, the on-vehicle generator monitoring device is a current detected by a battery current detection unit that detects a current value flowing from the generator to the battery and a load current detection unit that detects a current value flowing from the generator to the on-vehicle load. Based on the sum of the values, the output current value of the generator is obtained. The on-vehicle generator monitoring device determines the abnormality of the generator according to the total current value and the rotation speed of the generator.
A battery current detection unit that detects the value of the current flowing to the battery is mounted on a conventional vehicle for monitoring the state of the battery. A load current detection unit that detects a value of a current flowing to a vehicle-mounted load is mounted on a conventional vehicle for power supply control of each vehicle-mounted load. Therefore, it is possible to make an abnormality determination according to the output current value of the generator without adding new hardware or parts to detect the current value.

Further, in the present invention, the on-vehicle generator monitoring device acquires the output voltage value of the generator, the generated power amount determined from the output voltage value and output current value of the generator, and the threshold value determined according to the rotation speed of the generator. An abnormality is determined by comparison.
For example, the on-vehicle generator monitoring device stores the correspondence relationship between the rotational speed of the generator and the amount of generated power during normal operation, the generated power amount determined from the acquired output voltage value and output current value, and the acquired rotational speed An abnormality determination can be made by comparison with a threshold value determined according to the amount of generated power during normal operation corresponding to (for example, a threshold value that defines an allowable range of increase or decrease in power amount with respect to the normal generated power amount).
Thereby, the on-vehicle generator monitoring device can accurately determine the abnormality of the generator.

  In the present invention, a switch having a function of detecting the value of a current flowing from the generator to the vehicle load is provided in the current path from the battery to the vehicle load. The on-vehicle generator monitoring device controls connection / cutoff of one or a plurality of switches mounted on the vehicle, and can control supply / stop of electric power from the generator to the on-vehicle load. The on-vehicle generator monitoring device performs acquisition of information such as a current value, a rotation speed, and a voltage value, and abnormality determination processing based on these information under a plurality of conditions in which the switch connection / cutoff states are different from each other. The on-vehicle generator monitoring device performs final generator abnormality determination based on a plurality of determination results under a plurality of conditions. As a result, the on-vehicle generator monitoring device can determine the abnormality of the generator with higher accuracy.

  In the case of the present invention, the total value of the current values detected by the battery current detection unit for detecting the current value flowing from the generator to the battery and the load current detection unit for detecting the current value flowing from the generator to the vehicle load, and By adopting a configuration that determines the abnormality of the generator according to the number of revolutions of the generator, it is possible to generate power without adding new hardware or parts, etc. by utilizing the hardware or parts installed in the existing vehicle. It is possible to monitor abnormalities or deterioration of the machine.

It is a block diagram which shows the structure of the vehicle-mounted generator monitoring system which concerns on this Embodiment. It is a block diagram which shows the structure of a vehicle-mounted generator monitoring apparatus. It is a schematic diagram which shows an example of the electric power generation characteristic of a generator. It is a schematic diagram for demonstrating the determination process by a vehicle-mounted generator monitoring apparatus. It is a flowchart which shows the procedure of the determination process by a vehicle-mounted generator monitoring apparatus. It is a schematic diagram which shows an example of the conditions of the determination process which the vehicle-mounted generator monitoring apparatus which concerns on a modification performs.

  FIG. 1 is a block diagram showing a configuration of an in-vehicle generator monitoring system according to the present embodiment. The in-vehicle generator monitoring system according to the present embodiment is configured to supply the power generated by the generator 2 mounted on the vehicle 1 to the battery 3 and the plurality of in-vehicle loads 5a to 5c. A power supply control device 4 is interposed between the generator 2 and the on-vehicle loads 5a to 5c, and the power supply control device 4 individually supplies / not supplies power to the on-vehicle loads 5a to 5c from the generator 2. You can switch to That is, the power line connected to the output end of the generator 2 branches into two, one connected to the battery 3 and the other connected to the power supply control device 4. The power supply line connected to the power supply control device 4 is further branched into a plurality of parts in the power supply control device 4, and the plurality of branch lines are connected to the vehicle-mounted loads 5a to 5c via the switches 11a to 11c, respectively. .

  The battery 3 is configured using, for example, a lead storage battery, and supplies power to the on-vehicle loads 5a to 5c when the generator 2 is not operating. The on-vehicle loads 5 a to 5 c are ECUs (Electronic Control Units), actuators, lamps, or the like mounted on the vehicle 1. In this example, although the three vehicle-mounted loads 5a-5c are mounted in the vehicle 1, the number of vehicle-mounted loads may be two or less or four or more. In this example, one in-vehicle load 5a-5c is connected to one power line, but a plurality of in-vehicle loads may be connected to one power line.

  The power supply control device 4 includes a control unit 10, a plurality of switches 11 a to 11 c, and a communication unit 12. The control unit 10 performs control to individually switch connection / disconnection states of the switches 11a to 11c by individually outputting control signals to the switches 11a to 11c. The switches 11a to 11c according to the present embodiment have a function of detecting the value of a current flowing through the power supply path, as well as simply switching connection / cutoff of the power supply path. As the switches 11a to 11c, for example, a device known as a FET (Field Effect Transistor) with a self-protection function or a FET with a self-diagnosis function can be used. The switches 11a to 11c notify the detected current value to the control unit 10. The communication unit 12 communicates with other devices via the network in the vehicle 1 according to the control of the control unit 10. The communication unit 12 performs communication in accordance with, for example, a CAN (Controller Area Network) communication standard.

  The in-vehicle generator monitoring system according to the present embodiment includes an in-vehicle generator monitoring device 8 that monitors abnormality or deterioration of the generator 2. The in-vehicle generator monitoring device 8 may be mounted on the vehicle 1 as a device such as an engine control ECU. The on-vehicle generator monitoring device 8 receives the rotation speed of the generator 2, the output voltage value of the generator 2 detected by the voltage detection unit 6, and the current value flowing to the battery 3 detected by the current detection unit 7. Yes. The on-vehicle generator monitoring device 8 can communicate with the power supply control device 4 and the alarm device 9 via the network in the vehicle 1. As a result, the on-vehicle generator monitoring device 8 can receive information on the current value detected by each of the switches 11a to 11c from the power supply control device, and can issue a command to switch connection / disconnection of each of the switches 11a to 11c. It can be transmitted to the supply control device 4. The on-vehicle generator monitoring device 8 can issue an alarm to the driver of the vehicle 1 by transmitting an operation command to the alarm device 9.

  The generator 2 is a so-called alternator and is a device that generates power by the operation of the engine (not shown) of the vehicle 1. The generator 2 has a rotor to which the rotation of the engine is transmitted via a belt or the like, and generates electric power by the rotation of the rotor. The generator 2 (or a sensor provided in the generator 2) outputs a signal corresponding to the rotational speed of the rotor, data indicating the rotational speed, or the like to the in-vehicle generator monitoring device 8. The voltage detection unit 6 is connected to the output terminal of the generator 2 and outputs a signal corresponding to the output voltage or data indicating the output voltage value to the in-vehicle generator monitoring device 8. The current detection unit 7 is arranged in the power supply path from the branch point where the power line connected to the output end of the generator 2 branches to the input end of the battery 3. Of the current output from the generator 2, A current flowing into the battery 3 is detected. The current detection unit 7 outputs a signal corresponding to the detected current or data indicating a current value to the in-vehicle generator monitoring device 8. The alarm device 9 is configured using, for example, a display device such as a lamp or a display provided near the driver's seat of the vehicle 1 or a sound output device such as a buzzer or a speaker. The alarm device 9 issues an alarm according to a command given from the in-vehicle generator monitoring device 8 via an in-house network.

  FIG. 2 is a block diagram showing the configuration of the in-vehicle generator monitoring device 8. The in-vehicle generator monitoring device 8 according to the present embodiment includes a processing unit 20, a rotation speed input unit 21, a voltage value input unit 22, a current value input unit 23, a communication unit 24, a storage unit 25, and the like. Yes. The processing unit 20 is configured using an arithmetic processing device such as a CPU (Central Processing Unit) or an MPU (Micro-Processing Unit), and reads and executes a program (not shown) stored in the storage unit 25. Thus, various arithmetic processing and control processing related to monitoring of the generator 2 are performed.

  The rotation speed input unit 21 is connected to the generator 2 of the vehicle 1 through a signal line, and a signal or data corresponding to the rotation speed of the generator 2 is input. The rotational speed input unit 21 notifies the processing unit 20 of the rotational speed of the generator 2 based on the input signal or data. The voltage value input unit 22 is connected to the voltage detection unit 6 via a signal line, and receives a signal or data corresponding to the output voltage value of the generator 2 detected by the voltage detection unit 6. The voltage value input unit 22 notifies the processing unit 20 of the output voltage value of the generator 2 based on the input signal or data. The current value input unit 23 is connected to the current detection unit 7 through a signal line, and a signal or data corresponding to the current value to the battery 3 detected by the current detection unit 6 is input. The current value input unit 23 notifies the processing unit 20 of the value of the current flowing to the battery 3 based on the input signal or data.

  The communication unit 24 performs communication with other devices such as the power supply control device 4 and the alarm device 9 via the network in the vehicle 1. The communication unit 24 performs communication according to the CAN communication standard, for example. The communication unit 24 transmits a message to another device by converting the message for transmission given from the processing unit 20 into an electric signal and outputting it to the communication line. Further, the communication unit 24 receives a message by sampling and acquiring a signal on the communication line, and gives the received message to the processing unit 20. In the present embodiment, the on-vehicle generator monitoring device 8 communicates with the power supply control device 4 through the communication unit 24, thereby acquiring the current values detected by the power supply control device 4 with the switches 11a to 11c. be able to. Moreover, the vehicle-mounted generator monitoring apparatus 8 can perform an alarm for a driver or the like when an abnormality occurs by communicating with the alarm device 9 through the communication unit 24.

  The storage unit 25 is configured using a nonvolatile memory element such as a flash memory or an EEPROM (Electrically Erasable Programmable Read Only Memory). The storage unit 25 stores a program executed by the processing unit 20, data necessary for processing, and the like. In the present embodiment, the storage unit 25 stores data indicating the characteristics of power generated when the generator 2 is normal as generated power characteristics.

  FIG. 3 is a schematic diagram showing an example of the generated power characteristics of the generator 2, and shows a graph in which the horizontal axis is the rotational speed of the generator 2 and the vertical axis is the generated power of the generator 2. Further, the five curves shown in the graph of FIG. 3 indicate the generated power characteristics when the output voltage values of the generator 2 are 13V, 12V, 11V, 10V, and 9V, respectively. Such generated power characteristics are measured, for example, in a manufacturing process or a test process of the generator 2, and the measurement result is stored in the storage unit 25 as digital data. Thus, the generated power characteristic stored in the storage unit 25 in the present embodiment is information storing the correspondence between the rotational speed of the generator 2 and the generated power. The generated power characteristics may be individually measured for each generator 2, and the measurement result of a specific generator 2 is converted into data and stored in the storage unit 25 of the plurality of in-vehicle generator monitoring devices 8. May be. For example, the generated power characteristic may be a theoretical value calculated at the design stage of the generator 2 or a theoretical value calculated by simulation. Further, in this example, the generated power characteristics are shown for the case where the output voltage value is 5 for every 1V, but the data stored in the storage unit 25 is, for example, the output voltage value is for every 0.1V or 0.01V, etc. More detailed data is preferable. However, the in-vehicle generator monitoring device 8 may generate detailed data as necessary by performing calculations such as linear interpolation processing.

  The in-vehicle generator monitoring device 8 periodically acquires the rotational speed N, the output voltage value V, and the output current value Ia of the generator 2, and the generated power characteristics at that time obtained based on these acquired values. Then, by comparing with the generated power characteristics during normal operation stored in the storage unit 25, it is determined whether or not the generator 2 is abnormal or deteriorated. At this time, the in-vehicle generator monitoring device 8 can acquire the rotational speed N of the generator 2 based on information given from the rotational speed input unit 21. The on-vehicle generator monitoring device 8 can acquire the output voltage value V of the generator 2 based on information given from the voltage value input unit 22.

  In the on-vehicle generator monitoring system according to the present embodiment, the output current value Ia of the generator 2 cannot be directly detected. As shown in FIG. 1, the output current value Ia of the generator 2 satisfies the relationship of Ia = Ib + Ic, where Ib is the current value flowing to the battery 3 and Ic is the current value flowing to the power supply control device 4. Further, regarding the current value Ic, the relationship of Ic = Id0 + Id1 + Id1 is established, assuming that the currents flowing to the loads 5a to 5c are Id0 to Id2. Here, the current value Ic can be detected by the current detector 7, and the current values Id0 to Id2 can be detected by the switches 11a to 11c. Therefore, the processing unit 20 of the in-vehicle generator monitoring device 8 acquires the current value Ib detected by the current detection unit 7 at the current value input unit 23 and communicates with the power supply control device 4 at the communication unit 24. The current values Id0 to Id2 detected by the switches 11a to 11c are acquired. The processing unit 20 calculates the total current value Ia by adding the acquired current values Ib and Id0 to Id2.

  Further, the processing unit 20 of the in-vehicle generator monitoring device 8 calculates the generated power P = V × Ia of the generator 2 based on the acquired output voltage value V and output current value Ia of the generator 2. The processing unit 20 reads the generated power characteristic corresponding to the output voltage value V from the storage unit 25, and compares it with the current generated power characteristic based on the acquired rotation speed N of the generator 2 and the calculated generated power P. Thus, it is determined whether or not the generator 2 is abnormal or deteriorated.

  FIG. 4 is a schematic diagram for explaining the determination process by the in-vehicle generator monitoring device 8. As an example, the generated power characteristic shown in FIG. 3 when the output voltage value is 12 V is extracted and shown. . The processing unit 20 of the in-vehicle generator monitoring device 8 reads out the generated power characteristics of the generator 2 corresponding to the acquired output voltage value V from the storage unit 25. The processing unit 20 acquires the generated power P0 for the acquired rotation speed N of the generator 2 based on the read generated power characteristics. Next, the processing unit 20 calculates an upper limit value and a lower limit value such as ± 10% for the acquired generated power P0.

  The processing unit 20 compares the generated power P calculated based on the acquired output voltage value V and power values Ic, Id0 to Id2 with the power range defined by the calculated upper limit value and lower limit value. When the generated power P is within the power range of the upper limit value and the lower limit value, the processing unit 20 determines that the generator 2 is operating normally. When the generated power P is not within the power range of the upper limit value and the lower limit value, the processing unit 20 determines that an abnormality or deterioration has occurred in the generator 2 and issues a warning to the alarm device 9 at the communication unit 24. Send instructions.

  FIG. 5 is a flowchart showing a procedure of determination processing by the in-vehicle generator monitoring device 8. The processing unit 20 of the in-vehicle generator monitoring device 8 determines whether it is time to measure the generated power characteristics of the generator 8 (step S1). For example, the processing unit 20 determines that it is the measurement timing when the engine of the vehicle 1 is operating and a predetermined time (1 hour, 1 day, 1 week, etc.) has elapsed since the previous measurement. It can be configured. When it is determined that it is not the measurement timing (S1: NO), the processing unit 20 stands by until the measurement timing is reached.

  When it determines with it being a measurement timing (S1: YES), the process part 20 acquires the rotation speed N of the generator 2 in the rotation speed input part 21 (step S2), and the generator which the voltage detection part 6 detected. 2 is obtained by the voltage value input unit 22 (step S3). In addition, the processing unit 20 acquires the current value Ib to the battery 3 detected by the current detection unit 7 at the current value input unit 23 (step S4), and the communication unit 24 communicates with the power supply control device 4 to switch 11a. The current values Id0 to Id2 to the loads 5a to 5c detected by ˜11c are acquired (step S5). The processing unit 20 calculates the output current value Ia of the generator 2 by adding the current value Ib acquired in step S4 and the current values Id0 to Id2 acquired in step S5 (step S6). The processing unit 20 calculates the generated power P of the generator 2 based on the output voltage value V acquired in step S3 and the output current value Ia calculated in step S6 (step S7).

  Next, the processing unit 20 reads out the generated power characteristic corresponding to the output voltage value V acquired in step S3 from the storage unit 25 (step S8). The processing unit 20 acquires the normal generated power P0 based on the rotation speed N acquired in step S2 and the generated power characteristics read in step S8, and an upper limit value based on the generated power P0 and A lower limit value is calculated (step S9). The processing unit 20 determines whether or not the generated power P calculated in step S7 is within the power range defined by the upper limit value and the lower limit value calculated in step S9 (step S10). When the generated power P is within the power range (S10: YES), the processing unit 20 determines that the generator 2 is operating normally, and ends the process. When the generated power P is not within the power range (S10: NO), the processing unit 20 determines that an abnormality or deterioration has occurred in the generator 2, and transmits a command to the alarm device 9 through the communication unit 24. As a result, an alarm is output (step S11), and the process is terminated.

  The on-vehicle generator monitoring system according to the present embodiment having the above-described configuration includes a current detection unit 7 that detects a current value Ib flowing from the generator 2 to the battery 3, and currents from the generator 2 to the on-vehicle loads 5a to 5c. Switches 11a to 11c for switching the connection / cutoff of the route and detecting current values Id0 to Id2 to the vehicle-mounted loads 5a to 5c are provided. The in-vehicle generator monitoring device 8 calculates the total value of the current value Ib detected by the current detection unit 7 and the current values Id0 to Id2 detected by the switches 11a to 11c, so that the output current value Ia of the generator 2 is calculated. get. The in-vehicle generator monitoring device 8 acquires the rotational speed N of the generator 2 and determines an abnormality of the generator 2 according to the rotational speed N and the output current value Ia.

  The current detector 7 that detects the current value Ib flowing to the battery 3 is conventionally mounted in the vehicle 1 for monitoring the state of the battery 3 and the like. The switches 11a to 11c having a function of switching the connection / cutoff of the current path to the in-vehicle loads 5a to 5c and detecting the current values Id0 to Id2 flowing to the in-vehicle loads 5a to 5c are Conventionally, it is mounted on the vehicle 1 for power supply control to 5a to 5c. Therefore, the in-vehicle generator monitoring system according to the present embodiment responds to the output current value Ia of the generator 2 without adding new hardware or parts to detect the output current value Ia of the generator 2. An abnormal determination can be made.

  The on-vehicle generator monitoring device 8 obtains the output voltage value V of the generator 2, and depends on the generated power P determined from the output voltage value V and the output current value Ib of the generator 2 and the rotational speed N of the generator 2. An abnormality is determined by comparison with a threshold value determined in this way. For example, the in-vehicle generator monitoring device 8 stores the correspondence relationship between the rotation speed of the generator 2 and the generated power during normal operation in the storage unit 25 as the generated power characteristics, and acquires the acquired output voltage value V and output current amount Ib. The abnormality determination can be performed by comparing the generated power P determined from the above and the upper limit value and the lower limit value determined according to the generated power P0 at the normal operation corresponding to the acquired rotation speed N. Thereby, the in-vehicle generator monitoring device 8 can accurately determine the abnormality of the generator 2.

  In the present embodiment, the in-vehicle generator monitoring device 8 is mounted on the vehicle 1 as an engine control ECU, for example. However, the present invention is not limited to this, and an ECU other than the engine control ECU or a device other than the ECU. It may be mounted on the vehicle 1 or may be mounted on the vehicle 1 as a dedicated device for monitoring the generator 2. The in-vehicle generator monitoring device 8 and the power supply control device 4 may be a single device. In this case, the in-vehicle generator monitoring device 8 directly detects the current values Id0 to Id2 detected by the switches 11a to 11c without communication. Can be obtained.

  Moreover, although the vehicle-mounted generator monitoring apparatus 8 was set as the structure which memorize | stores the response | compatibility of rotation speed and generated electric power as a generated electric power characteristic in the memory | storage part 25, it does not restrict to this. For example, it is good also as a structure which memorize | stores the response | compatibility with the rotation speed of the generator 2, and the upper limit and lower limit used for determination, and in this case, the vehicle-mounted generator monitoring apparatus 8 performs the process which calculates an upper limit and a lower limit. Can be omitted. For example, the correspondence between the rotational speed of the generator 2 and the output current value may be stored. In this case, the in-vehicle generator monitoring device 8 performs a process of calculating the output power value P at the time of measurement. First, the output power value Ia that is the sum of the acquired current values Ib and Id0 to Id2 is compared with the threshold value calculated from the stored output current value.

(Modification)
The in-vehicle generator monitoring device 8 according to the modification has a configuration in which the acquisition of the rotation speed N, the output voltage value V, and the output current value Ia and the determination process using these information are performed a plurality of times under different conditions. The processing unit 20 of the in-vehicle generator monitoring device 8 according to the modification individually connects / disconnects the switches 11a to 11c by transmitting a switching command of the switches 11a to 11c to the power supply control device 4 through the communication unit 24. Switch to. The processing unit 20 performs determination processing under a plurality of conditions in which the states of connection / cutoff of the switches 11a to 11c are different, and determines whether there is an abnormality or deterioration of the generator 2 based on the plurality of determination results.

  FIG. 6 is a schematic diagram illustrating an example of conditions for determination processing performed by the in-vehicle generator monitoring device 8 according to the modification. The on-vehicle generator monitoring device 8 performs processing for obtaining the rotational speed N, the output voltage value V, and the output current value Ia and determining using these information, for example, under the five conditions shown in the figure. Condition 1 is when all three switches 11a to 11c are connected, Condition 2 is when switch 11a is connected and switches 11b and 11c are disconnected, and Condition 3 is when switch 11b is connected and The switch 11a, 11c is in the cut-off state, the condition 4 is the switch 11c is in the connected state and the switches 11a, 11b are in the cut-off state, and the condition 5 is all the three switches 11a-11c are in the cut-off state. Is the case.

  For example, the processing unit 20 of the in-vehicle generator monitoring device 8 transmits a command for setting all three switches 11a to 11c to the power supply control device 4 through the communication unit 24, and then the rotation speed N and the output voltage value V. Then, the current values Ib and Id0 to Id2 are acquired, it is determined whether or not the generated power P of the generator 2 is within the power range of the upper limit value and the lower limit value, and the determination result in the condition 1 is stored. Next, the processing unit 20 transmits a command for setting the switch 11a and the switches 11b and 11c to the cutoff state to the power supply control device 4, and then the rotation speed N, the output voltage value V, and the current values Ib, Id0 to Id2. Is obtained, and it is determined whether or not the generated power P of the generator 2 is within the power range of the upper limit value and the lower limit value, and the determination result in condition 2 is stored. Similarly, the in-vehicle generator monitoring device 8 transmits a command according to the conditions 3 to 5 to the power supply control device 4, performs determination under each condition, and stores the determination result.

  The vehicle-mounted generator monitoring device 8 that has finished the determination for all of the conditions 1 to 5 reads the stored determination results for each condition, and the generated power P is within the power range of the upper limit value and the lower limit value for all conditions. If the determination result is obtained, it is determined that the generator 2 is normal. On the other hand, if a determination result is obtained that the generated power P is not within the power range of the upper limit value and the lower limit value under any one condition, the in-vehicle generator monitoring device 8 is abnormal or deteriorated in the generator 2. And the like, and the alarm device 9 outputs an alarm.

  As described above, the on-vehicle generator monitoring device 8 according to the modification can control connection / disconnection of the switches 11a to 11c mounted on the vehicle 1, and supply power from the generator 2 to the on-vehicle loads 5a to 5c. / Stop can be controlled. The in-vehicle generator monitoring device 8 acquires information such as the rotational speed N, the output voltage value V, and the output current value Ia of the generator 2 under a plurality of conditions in which the states of connection / cutoff of the switches 11a to 11c are different. An abnormality determination process based on the information is performed. The in-vehicle generator monitoring device 8 performs a final abnormality determination of the generator 2 based on a plurality of determination results under a plurality of conditions. Thereby, the in-vehicle generator monitoring device 8 can determine the abnormality of the generator 2 with higher accuracy.

  In addition, in this modification, it was set as the structure which the vehicle-mounted generator monitoring apparatus 8 determines on five conditions shown in FIG. 6, However, these conditions 1-5 are examples, Comprising: It determines on conditions other than these It is good as composition. The on-vehicle generator monitoring device 8 may be configured to perform determination under four or less conditions or six or more conditions. In each condition, the calculation method of the upper limit value and the lower limit value may be changed. For example, in condition 1, the value of ± 10% of the generated power P0 acquired according to the rotational speed N from the generated power characteristics of the storage unit 25 is set as the upper limit value and the lower limit value, and in condition 2, ± 15% of the generated power P0 is set. The determination threshold value may be calculated based on different criteria such as an upper limit value and a lower limit value.

DESCRIPTION OF SYMBOLS 1 Vehicle 2 Generator 3 Battery 4 Power supply control apparatus 5a-5c Car-mounted load 6 Voltage detection part 7 Current detection part (battery current detection part)
8 On-vehicle generator monitoring device 9 Alarm device 10 Control unit 11a to 11c Switch (load current detection unit)
12 communication unit 20 processing unit (total current value calculation unit, determination unit)
21 Rotation speed input part (Rotation speed acquisition part)
22 Voltage value input unit (Voltage value acquisition unit)
23 Current value input unit (first current value acquisition unit)
24 communication unit (second current value acquisition unit)
25 storage unit

Claims (6)

A first current value acquisition unit that acquires a current value detected by a battery current detection unit that detects a current value flowing from the generator mounted on the vehicle to the battery;
A second current value acquisition unit that acquires a current value detected by a load current detection unit that is provided in a current path from the generator to one or a plurality of in-vehicle loads and detects a current value flowing to the in-vehicle load;
A total current value calculation unit that calculates a total current value of the current value acquired by the first current value acquisition unit and the current value acquired by the second current value acquisition unit;
A rotation speed acquisition unit for acquiring the rotation speed of the generator;
An in-vehicle generator monitoring device comprising: a determination unit that determines abnormality of the generator according to the total current value calculated by the total current value calculation unit and the rotation speed acquired by the rotation speed acquisition unit . A voltage value acquisition unit that acquires a voltage value detected by a voltage detection unit that detects an output voltage value of the generator;
The determination unit includes the total electric current value calculated by the total electric current value calculation unit and the generated electric energy of the generator determined based on the voltage value acquired by the voltage acquisition unit, and the rotation number acquired by the rotation number acquisition unit. The in-vehicle generator monitoring device according to claim 1, wherein an abnormality of the generator is determined by comparison with a threshold value determined according to. A storage unit that stores the correspondence between the rotational speed and the amount of generated power when the generator is operating normally,
The determination unit includes the total electric current value calculated by the total electric current value calculation unit and the generated electric energy of the generator determined based on the voltage value acquired by the voltage acquisition unit, and the rotation number acquired by the rotation number acquisition unit. The in-vehicle generator monitoring device according to claim 3, wherein abnormality of the generator is determined by comparison with a threshold value determined according to the correspondence relationship stored in the storage unit. The load current detection unit is arranged in a current path from the generator to the in-vehicle load and is provided in a switch that switches connection / cutoff of the current path,
The determination unit performs determination based on a plurality of conditions with different connection / cutoff states of the switch, and determines abnormality of the generator based on a plurality of determination results. The vehicle-mounted generator monitoring apparatus as described in any one of these. A battery current detector for detecting a current value flowing from the generator mounted on the vehicle to the battery;
A load current detection unit that is provided in a current path from the generator to one or more in-vehicle loads and detects a current value flowing to the in-vehicle load;
A first current value acquisition unit that acquires a current value detected by the battery current detection unit, a second current value acquisition unit that acquires a current value detected by the load current detection unit, and the first current value acquisition unit A total current value calculation unit that calculates a current value and a total current value of the current values acquired by the second current value acquisition unit, a rotation speed acquisition unit that acquires the rotation speed of the generator, and the total current value calculation unit An in-vehicle generator monitoring device having a determination unit that determines abnormality of the generator in accordance with the total current value calculated by the engine and the rotation speed acquired by the rotation speed acquisition unit. system. Obtain the current value detected by the battery current detection unit that detects the current value flowing from the generator mounted on the vehicle to the battery,
Obtaining a current value detected by a load current detection unit that detects a current value that is provided in a current path from the generator to one or more in-vehicle loads and flows to the in-vehicle load;
Calculate the total current value of the current value acquired from the battery current detection unit and the current value acquired from the load current detection unit,
Obtaining the rotational speed of the generator,
An in-vehicle generator monitoring method, wherein abnormality of the generator is determined according to the calculated total current value and the acquired rotation speed.

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