JP2014049916A - On-vehicle electronic control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an on-vehicle electronic control device that can keep a vehicle system in operation even if a built-in AD converter fails.SOLUTION: An on-vehicle electronic control device 1 connects with sensors 21-25, and acquires sensor signals output from the sensors 21-25, respectively, through AD conversion. In the on-vehicle electronic control device 1, a CPU 19 executes an anomalous path detection process to detect anomalous paths from among a plurality of transmission paths and a plurality of reception paths. A path selection process is also executed to select at least one from the plurality of transmission paths, excluding the anomalous path, and at least one from the plurality of reception paths, excluding the anomalous path, to be allocated to each of the sensors 21-25.

Description

  The present invention relates to an in-vehicle electronic control device that is mounted on a vehicle and used.

  Conventionally, in order to control a vehicle system, an electronic control device such as a microcomputer incorporating an AD converter is mounted on the vehicle and used. In such an electronic control device, a technique for determining whether or not AD conversion is correctly performed by a built-in AD converter is known (see, for example, Patent Document 1).

JP 2009-284302 A

  In the prior art described in Patent Document 1, it is possible to determine whether or not AD conversion is correctly performed in the AD converter, but control when it is determined that AD conversion is not correctly performed is considered. Not. Therefore, when the AD converter fails and AD conversion is not performed correctly, it is difficult for the vehicle system equipped with this microcomputer to continue further operation.

  An object of the present invention is to provide an in-vehicle electronic control device that allows operation of a vehicle system to continue even when a built-in AD converter fails.

  An in-vehicle electronic control device according to the present invention is connected to a plurality of sensors, acquires a sensor signal output from each of the plurality of sensors by AD conversion, and includes a plurality of AD converters, an arithmetic device, A plurality of transmission paths for outputting an AD conversion command for the sensor signal from the arithmetic unit to each of the plurality of AD converters, and a sensor signal AD-converted by each of the plurality of AD converters according to the AD conversion command A plurality of reception paths for inputting to the arithmetic device. In this on-vehicle electronic control device, the arithmetic device includes an abnormal path detection unit that detects an abnormal path from among a plurality of transmission paths and a plurality of reception paths, and a plurality of the plurality of sensors excluding the abnormal paths. A path selection unit that selects and assigns at least one of the transmission paths of the transmission path and at least one of a plurality of reception paths excluding the abnormal path, and a transmission path assigned by the path selection unit An AD conversion command transmitting unit that transmits an AD conversion command to the AD converter, and an AD conversion result receiving unit that receives a sensor signal AD converted by the AD converter using the reception path assigned by the path selecting unit And having.

  According to the present invention, it is possible to provide an in-vehicle electronic control device that enables operation of a vehicle system to continue even when a built-in AD converter fails.

It is a figure which shows the structure of the vehicle-mounted electronic control apparatus by one Embodiment of this invention. It is a control block diagram of CPU. It is a figure which shows the example of the selection path | pass at the time of normal. It is a figure which shows the example of the selection path | pass at the time of abnormality. It is a flowchart which shows the procedure of AD conversion command transmission processing. It is a flowchart which shows the procedure of an abnormal path detection process. It is a flowchart which shows the procedure of a path | pass selection process.

  Hereinafter, an embodiment of the present invention will be described. FIG. 1 is a diagram showing a configuration of an in-vehicle electronic control device according to an embodiment of the present invention. An in-vehicle electronic control device 1 shown in this figure is used by being mounted on a vehicle in order to control various devices of the vehicle, and includes a multiplexer 11, AD converters 12 and 13, a transmission FIFO (First- In First-Out) memories 14 and 15, receiving FIFO memories 16 and 17, RAM 18, and CPU 19. The on-vehicle electronic control device 1 is connected to the sensors 21 to 25. Note that the on-vehicle electronic control device 1 configured as shown in FIG. 1 can be realized by using, for example, a microcomputer incorporating an AD converter.

  The sensors 21 to 25 detect various physical quantities for use in vehicle control, such as current, voltage, temperature, rotational speed, hydraulic pressure, etc., and send sensor signals corresponding to the detected values to the on-vehicle electronic control device 1. Output each. Each sensor signal from the sensors 21 to 25 is input to the multiplexer 11 in the in-vehicle electronic control device 1.

  Furthermore, in addition to the sensor signals from the sensors 21 to 25, a predetermined reference signal having a known signal level is also input to the multiplexer 11. For example, a constant power supply voltage used in the in-vehicle electronic control device 1 can be used as the reference signal.

  The multiplexer 11 sequentially selects each sensor signal from the sensors 21 to 25 or the above-described reference signal under the control of the CPU 19 and outputs it to the AD converters 12 and 13. The AD converters 12 and 13 perform AD conversion of the input sensor signal or reference signal from an analog format to a digital format in response to an AD conversion command output from the CPU 19, and receive the signal as sensor signal data or reference signal data. The data is output to the FIFO memory 16 or 17. The reception FIFO memories 16 and 17 temporarily hold sensor signal data or reference signal data input from the AD converters 12 and 13. This sensor signal data or reference signal data is read from the reception FIFO memories 16 and 17 under the control of the CPU 19 and recorded at a predetermined address in the RAM 18.

  In the RAM 18, AD conversion commands for the sensor signals and the reference signals from the sensors 21 to 25 are stored at a predetermined address different from that where the sensor signal data and the reference signal data are recorded. The CPU 19 reads out AD conversion commands for the sensor signals and the reference signals from the RAM 18 at predetermined timings, and outputs them to the transmission FIFO memories 14 and 15. The transmission FIFO memories 14 and 15 temporarily hold the AD conversion command input from the RAM 18 and then output it to the AD converter 12 or 13 according to the control of the CPU 19.

  Here, the transmission FIFO memory 14 can output an AD conversion command from the CPU 19 to both the AD converter 12 and the AD converter 13. Similarly, the transmission FIFO memory 15 can output an AD conversion command to both the AD converter 12 and the AD converter 13. The combination of the transmission FIFO memories 14 and 15 and the AD converters 12 and 13 related to the output of the AD conversion command is hereinafter referred to as a transmission path. That is, the in-vehicle electronic control device 1 has a plurality of transmission paths in order to output an AD conversion command from the CPU 19 to the AD converter 12 or 13.

  In addition, the AD converter 12 performs sensor signal data obtained by AD conversion of sensor signals from the sensors 21 to 25 and a reference signal obtained by AD conversion of the reference signal for both the reception FIFO memory 16 and the reception FIFO memory 17. Data can be output. Similarly, the AD converter 13 can output sensor signal data and reference signal data to both the reception FIFO memory 16 and the reception FIFO memory 17. The combination of the AD converters 12 and 13 and the reception FIFO memories 16 and 17 relating to the output of the sensor signal data and the reference signal data is hereinafter referred to as a reception path. That is, the in-vehicle electronic control device 1 has a plurality of reception paths for inputting the sensor signal and the reference signal AD converted by the AD converters 12 and 13 to the CPU 19 in accordance with the AD conversion command from the CPU 19. ing.

  FIG. 2 is a control block diagram of the CPU 19. As shown in FIG. 2, the CPU 19, which is an arithmetic device, controls each control block of the AD conversion command transmission unit 191, the AD conversion result reception unit 192, the abnormal path detection unit 193, the path selection unit 194, and the control system processing unit 195. Has functionally.

  The AD conversion command transmission unit 191 executes AD conversion command transmission processing described later with reference to FIG. 5 at predetermined timings. As a result, an AD conversion command for each sensor signal or reference signal from the sensors 21 to 25 is read from the RAM 18 and transmitted to the AD converter 12 or 13 using any of the transmission paths described above.

  The AD conversion result receiving unit 192 receives the sensor signal data or the reference signal data output from the AD converter 12 or 13 using any of the above-described reception paths. As described above, the sensor signal data or the reference signal data is obtained by converting any one of the sensor signals 21 to 25 of the sensors 21 to 25 according to the AD conversion command transmitted by the AD conversion command transmitting unit 191. Or 13 is obtained by AD conversion.

  Based on the reference signal data received by the AD conversion result reception unit 192, the abnormal path detection unit 193 performs an abnormal path detection process described later with reference to FIG. Thereby, when there is an abnormal path in which data transfer is not normally performed in the transmission path and the reception path, the abnormal path is detected.

  The path selection unit 194 executes a path selection process which will be described later with reference to FIG. As a result, the transmission path used when the AD conversion command transmission unit 191 transmits the AD conversion command is selected from the normal transmission paths excluding the abnormal path detected by the abnormal path detection unit 193. In addition, the reception path used when the AD conversion result reception unit 192 receives the sensor signal data or the reference signal data is selected from the normal reception paths excluding the abnormal path detected by the abnormal path detection unit 193.

  Based on each sensor signal data received by the AD conversion result receiving unit 192, the control system processing unit 195 calculates and processes for controlling various devices of the vehicle such as an engine or an electric motor that is a driving device of the vehicle. I do. The results of computation and processing by the control system processing unit 195 are output to other control devices in the vehicle as necessary.

  Next, selection of a transmission path and a reception path will be described. As described above, in the in-vehicle electronic control device 1, the transmission path and the reception path are respectively selected from the normal transmission path and the reception path excluding the abnormal path by the processing of the path selection unit 194. This state will be described below with reference to FIGS.

  FIG. 3 is a diagram illustrating an example of a selection path at a normal time. When there is no abnormal path, a transmission path and a reception path are assigned to each of the sensors 21 to 25 and the reference signal according to the priority order of each sensor signal set in advance. For example, as shown in FIG. 3, for the reference signal and the sensors 21 and 22, a transmission path including the transmission FIFO memory 14 and the AD converter 12, and a reception path including the AD converter 12 and the reception FIFO memory 16 are provided. And are assigned. Further, a transmission path including the transmission FIFO memory 15 and the AD converter 13 and a reception path including the AD converter 13 and the reception FIFO memory 17 are allocated to the sensors 23 to 25. Note that the transmission path and the reception path indicated by broken-line arrows in FIG. 3 indicate paths that are not selected.

  FIG. 4 is a diagram illustrating an example of a selection path at the time of abnormality. Assume that the AD converter 12 cannot perform normal AD conversion due to a failure or the like in the normal selection path shown in FIG. In this case, the transmission path and the reception path including the AD converter 12 are detected as abnormal paths and excluded from the subsequent selection targets. As a result, for example, as shown in FIG. 4, for the reference signal and the sensors 21, 22, a transmission path including the transmission FIFO memory 14 and the AD converter 13 instead of the path described in FIG. A reception path including the converter 13 and the reception FIFO memory 16 is newly allocated. The paths assigned to the sensors 23 to 25 remain the same as in FIG. As a result, even if an abnormality occurs in a part of the transmission path or the reception path in the in-vehicle electronic control device 1, the operation of the in-vehicle electronic control device 1 is performed using the transmission path and the reception path excluding the abnormal path. To be able to continue. In FIG. 4 as well, similarly to FIG. 3, the transmission path and the reception path indicated by the broken-line arrows indicate paths that are not selected.

  FIG. 5 is a flowchart showing a procedure of AD conversion command transmission processing. The AD conversion command transmission process shown in this flowchart is executed by the AD conversion command transmission unit 191 at, for example, a certain period or when a predetermined interrupt condition is satisfied.

  In step S10, the AD conversion command transmission unit 191 determines whether or not the fail safe flag is on. If the fail safe flag is off, the process proceeds to step S20. If the fail safe flag is on, the AD conversion command transmission process shown in the flowchart of FIG. 5 is terminated. Note that the fail-safe flag is a state in which the vehicle-mounted electronic control device 1 cannot normally acquire a sensor signal, and therefore whether or not it is necessary to perform vehicle control using a predetermined fail-safe value instead of the sensor signal. It is a flag for indicating. This fail safe flag is turned on when all paths are detected as abnormal paths in the abnormal path detection process described later.

  In step S20, the AD conversion command transmission unit 191 determines whether or not to execute an abnormal path detection process. If it is determined that the abnormal path detection process is to be executed, the process proceeds to step S30. If it is determined not to be executed, the process proceeds to step S40. The determination in step S20 can be performed based on a predetermined execution condition. For example, when abnormal path detection processing is executed at regular intervals, a threshold is set as an execution condition for the elapsed time from the previous processing, and whether or not abnormal path detection processing is executed is determined based on this threshold. do it.

  Alternatively, the execution condition may be determined based on the operation state of the vehicle. For example, when the ignition switch is turned on to start the operation of the vehicle and the vehicle-mounted electronic control device 1 is turned on, or conversely, the ignition switch is turned off and the operation of the vehicle is stopped. Is satisfied and step S20 is affirmed. In addition, when the number of revolutions of the engine or electric motor that is the vehicle drive device is equal to or less than a predetermined value, it may be determined that the execution condition is satisfied, and the determination in step S20 may be affirmative. In this way, the abnormal path detection process can be executed when the AD conversion load is low in the in-vehicle electronic control device 1. Therefore, the abnormal path detection process can be executed at an appropriate timing that does not adversely affect the vehicle control performed by the in-vehicle electronic control device 1. A combination of these execution conditions may be used.

  In step S <b> 30, the AD conversion command transmission unit 191 reads an AD conversion command for the reference signal from the RAM 18 and transmits it to the AD converter 12 or the AD converter 13. The transmission path used at this time is assigned to the reference signal by the path selection unit 194 performing a path selection process described later.

  When the AD conversion command is transmitted in step S30, the reference signal is AD-converted by the AD converter 12 or the AD converter 13 to generate reference signal data. Then, the reference signal data is received by the AD conversion result receiving unit 192 and recorded in the RAM 18. The reception path used at this time is assigned to the reference signal by the path selection unit 194 performing a path selection process described later. As will be described later, the assignment of the transmission path and the reception path to the reference signal is not constant, and is sequentially changed in the path selection process performed by the path selection unit 194. Therefore, the received reference signal data is recorded in a separate place for each path in the RAM 18.

  In step S40, the AD conversion command transmission unit 191 determines whether or not the thinning request flag is on. When the thinning request flag is on, the process proceeds to step S50, and when it is off, the process proceeds to step S60. Note that the thinning request flag indicates whether any path is abnormal in the in-vehicle electronic control apparatus 1 and therefore it is necessary to thin out the AD conversion of the sensor signal from the sensor having a low priority. Flag. This thinning request flag is turned on when some paths are detected as abnormal paths in an abnormal path detection process described later.

  In step S50, the AD conversion command transmission unit 191 thins out AD conversion commands for the sensors with lower priority based on the priorities preset for the sensors 21 to 25. For example, for a sensor with a high priority, the AD conversion cycle at the normal time is maintained, while for a sensor with a low priority, the AD conversion cycle is lowered from that at the normal time, and AD conversion is performed in accordance with the AD conversion cycle. Decimate the output of instructions. Further, at this time, the output of the AD conversion command may be stopped for the sensor having the lowest priority. The priority order of the sensors 21 to 25 is preferably set based on the importance in vehicle control. Thereby, when there is an abnormality in some of the paths, it is possible to reduce the load concentrated on the normal path while considering the influence on the vehicle control.

  In step S <b> 60, the AD conversion command transmission unit 191 reads an AD conversion command for each of the sensors 21 to 25 from the RAM 18 and transmits it to the AD converter 12 or the AD converter 13. Here, it is not necessary to send an AD conversion command to all of the sensors 21 to 25, and if an AD conversion command to the corresponding sensor is sent at a timing corresponding to a preset AD conversion cycle of each sensor. Good. In addition, about the sensor by which the AD conversion command was thinned by the above-mentioned step S50, an AD conversion command is transmitted at the timing after the thinning. The transmission path used at this time is assigned to each of the sensors 21 to 25 by the path selection unit 194 performing a path selection process described later.

  When the AD conversion command is transmitted in step S60, the AD converter 12 or the AD converter 13 correspondingly converts the sensor signal from the corresponding sensor among the sensors 21 to 25 to generate sensor signal data. Is done. Then, the sensor signal data is received by the AD conversion result receiving unit 192 and recorded in the RAM 18. The reception path used at this time is assigned to the sensor when the path selection unit 194 executes a path selection process described later.

  When step S60 is executed, the AD conversion command transmission unit 191 ends the AD conversion command transmission processing shown in the flowchart of FIG.

  FIG. 6 is a flowchart illustrating a procedure of abnormal path detection processing. The abnormal path detection process shown in this flowchart is executed by the abnormal path detection unit 193 at a predetermined timing, for example, at regular intervals.

  In step S110, the abnormal path detection unit 193 determines whether the AD conversion result of the reference signal has been received. As described above, when the AD conversion command for the reference signal is transmitted by the AD conversion command transmitting unit 191 in step S30 of FIG. 5, the AD conversion result of the reference signal is received as the reference signal data accordingly, and the RAM 18 To be recorded. If the reference signal data has been received, the process proceeds to step S120. If not, the abnormal path detection process shown in the flowchart of FIG. 6 ends.

  In step S120, the abnormal path detection unit 193 compares the AD conversion result of the reference signal represented by the received reference signal data recorded in the RAM 18 with a reference value stored in advance. The AD conversion result of the reference signal is obtained by using the transmission path and the reception path assigned to the reference signal among the plurality of transmission paths and reception paths of the in-vehicle electronic control device 1. Alternatively, it is obtained by AD conversion of the reference signal by the AD converter 13. Here, as described above, the reference signal data is recorded in different locations in the RAM 18 for each pass. In step S120, each reference signal data for each path is compared with a reference value.

  In step S130, the abnormal path detection unit 193 determines whether or not the AD conversion result of the reference signal matches the reference value based on the comparison result in step S120. If the AD conversion result represented by any one of the reference signal data does not match the reference value, it is determined that there is an abnormal path and the process proceeds to step S140. On the other hand, if all the reference signal data match the reference value, it is determined that there is no abnormal path, and the abnormal path detection process shown in the flowchart of FIG.

  In step S140, the abnormal path detection unit 193 sets the abnormal path detection flag to ON. The abnormal path detection flag is a flag for indicating that one of the transmission path and the reception path is detected as an abnormal path.

  In step S150, the abnormal path detection unit 193 identifies an abnormal path. This process can be performed based on the determination result of step S130. That is, the transmission path and the reception path when the reference signal data determined not to match the reference value in step S130 are specified as abnormal paths in step S150.

  By the processing of steps S120 to S150 described above, the abnormal path detection unit 193 AD-converts the reference signal by the AD converter 12 or 13 using any of the plurality of transmission paths and any of the plurality of reception paths. The AD conversion result and the reference value stored in advance with respect to the reference signal are compared, and an abnormal path can be detected based on the comparison result.

  In step S160, the abnormal path detection unit 193 excludes the abnormal path identified in step S150 from the normal path list. The normal path list is a list of normal ones among a plurality of transmission paths and reception paths of the in-vehicle electronic control device 1. The information of the normal path list is stored in the RAM 18 and used in the path selection process performed by the path selection unit 194.

  In step S170, the abnormal path detection unit 193 determines whether a normal path exists. If a normal path exists, that is, if at least one normal path is registered in the normal path list, the process proceeds to step S180. On the other hand, when there is no normal path, that is, when all of the transmission path and the reception path are detected as abnormal paths, and no normal path is registered in the normal path list, the process proceeds to step S190.

  In step S180, the abnormal path detection unit 193 sets the thinning request flag described above to ON. As a result, when any one of the transmission path and the reception path is detected as an abnormal path, the output of the AD conversion command for the sensor signal from some of the sensors 21 to 25 is performed in the step of FIG. In S50, the thinning is performed. When step S180 is executed, the abnormal path detection process shown in the flowchart of FIG. 6 ends.

  In step S190, the abnormal path detection unit 193 sets the above-described fail safe flag to ON. Thereby, when all of the transmission path and the reception path are detected as abnormal paths, the vehicle-mounted electronic control device 1 performs vehicle control using a predetermined fail-safe value. When step S190 is executed, the abnormal path detection process shown in the flowchart of FIG. 6 ends.

  FIG. 7 is a flowchart showing a procedure of path selection processing. The path selection process shown in this flowchart is executed by the path selection unit 194 at a predetermined timing, for example, at regular intervals.

  In step S210, the path selection unit 194 determines whether or not the fail safe flag is on, as in step S10 of FIG. If the failsafe flag is off, the process proceeds to step S220. If the failsafe flag is on, the path selection process shown in the flowchart of FIG. 7 ends.

  In step S220, the path selection unit 194 refers to the above-described normal path list stored in the RAM 18.

  In step S230, the path selection unit 194 assigns a transmission path and a reception path for the reference signal from among normal transmission paths and reception paths based on the normal path list referenced in step S220. At this time, the transmission path and the reception path assigned to the reference signal are not changed, but are sequentially changed. For example, on the basis of the registration order in the normal path list, the path assigned to the reference signal is moved on the list one by one each time. Note that the transmission path and the reception path assigned to the reference signal may be sequentially changed by other methods.

  In step S240, the path selection unit 194 allocates transmission paths and reception paths for the sensors 21 to 25 from the normal transmission paths and reception paths based on the normal path list referenced in step S220. For example, based on the registration order in the normal path list, the transmission path and the reception path are assigned in order from the sensor with the highest priority in consideration of the transmission capacity of each path. Note that the paths assigned here do not need to be sequentially changed, unlike the paths assigned to the reference signal in step S230 described above. If step S240 is performed, the path | pass selection process shown to the flowchart of FIG. 7 will be complete | finished.

  According to the embodiment described above, the following operational effects are obtained.

(1) The vehicle-mounted electronic control device 1 is connected to the sensors 21 to 25 and acquires the sensor signals output from the sensors 21 to 25 by AD conversion. This in-vehicle electronic control device 1 includes AD converters 12 and 13, a CPU 19 that is an arithmetic device, a plurality of transmission paths for outputting an AD conversion command for a sensor signal from the CPU 19 to the AD converters 12 and 13, And a plurality of reception paths for inputting the sensor signals AD-converted by each of the AD converters 12 and 13 in response to the AD conversion command to the CPU 19. The CPU 19 functionally includes an abnormal path detection unit 193, a path selection unit 194, an AD conversion command transmission unit 191, and an AD conversion result reception unit 192. The abnormal path detection unit 193 detects an abnormal path from a plurality of transmission paths and a plurality of reception paths by executing an abnormal path detection process (steps S120 to S150). The path selection unit 194 performs path selection processing, so that each of the sensors 21 to 25 receives at least one of a plurality of transmission paths excluding the abnormal path and a plurality of receptions excluding the abnormal path. At least one of the paths is selected and assigned (step S240). The AD conversion command transmission unit 191 transmits the AD conversion command to the AD converters 12 and 13 using the transmission path assigned by the path selection unit 194 by executing the AD conversion command transmission process (step S60). . The AD conversion result receiving unit 192 receives the sensor signal AD-converted by the AD converters 12 and 13 using the reception path assigned by the path selection unit 194. Since it did in this way, even when built-in AD converters 12 and 13 fail, the vehicle-mounted electronic control apparatus 1 which can continue operation | movement of a vehicle system can be provided.

(2) The abnormal path detection unit 193 AD-converts a predetermined reference signal by the AD converter 12 or 13 using any of the plurality of transmission paths and any of the plurality of reception paths in steps S120 to S150. The AD conversion result is compared with a predetermined reference value stored in advance with respect to the reference signal, and an abnormal path is detected based on the comparison result. Since it did in this way, an abnormal path can be detected reliably and easily.

(3) The AD conversion command transmission unit 191 determines whether or not to execute the abnormal path detection process based on a predetermined execution condition based on the operation state of the vehicle (step S20), and transmits an AD conversion command for the reference signal. (Step S30). In response to the AD conversion command, the AD converters 12 and 13 are operated at predetermined timings according to the operation state of the vehicle, specifically, when the operation of the vehicle is started or stopped, and at the vehicle drive device. The reference signal is AD-converted at a timing including at least one of the rotation speed of a certain engine or electric motor being a predetermined value or less. The abnormal path detection unit 193 detects an abnormal path in steps S120 to S150 by AD converting the reference signal by the AD converters 12 and 13 in this way. Since it did in this way, an abnormal path | pass detection process can be performed at the appropriate timing which does not have a bad influence with respect to the vehicle control which the vehicle-mounted electronic control apparatus 1 performs.

(4) When the abnormal path is detected by the abnormal path detection unit 193, the AD conversion command transmission unit 191 thins out or stops the output of the AD conversion command with respect to sensor signals from some of the sensors 21 to 25. (Step S50). Since it did in this way, the load which concentrates on a normal path | pass can be reduced considering the influence on vehicle control.

  In the embodiment described above, a plurality of transmission paths and a plurality of reception paths are configured by a combination of the AD converters 12 and 13, the transmission FIFO memories 14 and 15, and the reception FIFO memories 16 and 17. However, the configuration of the transmission path and the reception path to which the present invention can be applied is not limited to this. For example, the present invention can also be applied to a microprocessor having three or more AD converters, or a microprocessor in which a transmission FIFO memory and a reception FIFO memory are configured in a plurality of stages. Further, the present invention can be similarly applied when a transmission path and a reception path are configured using a plurality of microprocessors.

  As long as the characteristics of the present invention are not impaired, the present invention is not limited to the above-described embodiments, and other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention. .

DESCRIPTION OF SYMBOLS 1 Vehicle-mounted electronic control apparatus 11 Multiplexer 12, 13 AD converter 14, 15 Transmission FIFO memory 16, 17 Reception FIFO memory 18 RAM
19 CPU
21-25 Sensor 191 AD conversion command transmission unit 192 AD conversion result reception unit 193 Abnormal path detection unit 194 Path selection unit 195 Control system processing unit

Claims (5)

A vehicle-mounted electronic control device that is connected to a plurality of sensors and acquires a sensor signal output from each of the plurality of sensors by AD conversion,
A plurality of AD converters;
An arithmetic unit;
A plurality of transmission paths for outputting an AD conversion command for the sensor signal from the arithmetic unit to each of the plurality of AD converters;
A plurality of reception paths for inputting the sensor signals AD-converted by each of the plurality of AD converters in response to the AD conversion command to the arithmetic unit;
The arithmetic unit is:
An abnormal path detector that detects an abnormal path from the plurality of transmission paths and the plurality of reception paths;
For each of the plurality of sensors, at least one of the plurality of transmission paths excluding the abnormal path and at least one of the plurality of reception paths excluding the abnormal path, A path selector to select and assign;
An AD conversion command transmission unit that transmits the AD conversion command to the AD converter using the transmission path assigned by the path selection unit;
An in-vehicle electronic control device comprising: an AD conversion result receiving unit that receives the sensor signal AD-converted by the AD converter using the reception path assigned by the path selection unit. The in-vehicle electronic control device according to claim 1,
The abnormal path detection unit uses an AD conversion result when a predetermined reference signal is AD-converted by the AD converter using any one of the plurality of transmission paths and one of the plurality of reception paths, and the reference A vehicle-mounted electronic control device, wherein a signal is compared with a predetermined reference value stored in advance, and the abnormal path is detected based on the comparison result. The in-vehicle electronic control device according to claim 2,
The AD converter AD converts the reference signal at a predetermined timing according to the operating state of the vehicle,
The in-vehicle electronic control device, wherein the abnormal path detection unit detects the abnormal path by AD conversion of the reference signal by the AD converter. The on-vehicle electronic control device according to claim 3,
The predetermined timing includes at least one of when the operation of the vehicle is started or stopped and when the rotational speed of the driving device of the vehicle is equal to or less than a predetermined value. Electronic control device. In the vehicle-mounted electronic control apparatus as described in any one of Claims 1 thru | or 4,
The AD conversion command transmission unit thins out or stops the output of the AD conversion command with respect to sensor signals from some of the plurality of sensors when the abnormal path is detected by the abnormal path detection unit. An on-vehicle electronic control device.

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