JP2004163187A - Electronic control device for vehicles - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an electronic control device for vehicle for measuring and storing various kinds of required data in a built-in computer which can change measurement items and measuring conditions by simple and inexpensive configuration. <P>SOLUTION: Only when a measuring condition and a measurement item are set, and measured data are read, a failure diagnostic device is connected to the electronic control device. Measured data are stored in a built-in memory of the electronic control device properly according to the set measuring condition, during measurement regardless of whether or not the failure diagnostic device is connected. It is not necessary to connect the failure diagnostic device or the like to the control device during measurement, and its configuration is inexpensive. In addition, the measuring conditions and measurement items can be altered using the failure diagnostic device, and appropriate measured data can be recorded in each repair work. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an electronic control device mounted on a vehicle, and more particularly to an electronic control device for a vehicle having a function of storing data of various items calculated in a microcomputer built in the electronic control device in time series.
[0002]
[Prior art]
2. Description of the Related Art In recent years, electronic control devices mounted on automobiles tend to have improved control accuracy, higher response, and more functions, and are equipped with microcomputers.
[0003]
Various sensors and various actuators are electrically connected to the electronic control unit, and the microcomputer performs predetermined calculations according to the input sensor signals, and performs various controls by outputting actuator drive signals based on the calculation results. In addition, it has a failure diagnosis function of determining the presence or absence of a failure of the sensor or the actuator from the state of the input signal. The result of the failure diagnosis is transmitted to the driver by a lamp or the like provided on a meter panel in the vehicle cabin, and is used for accurately specifying a failure portion in a repair work. Specifically, a failure diagnosis device having a portable display function is connected to an electronic control device, and the result of the failure diagnosis is transmitted from the electronic control device to the failure diagnosis device via communication and displayed.
[0004]
Further, for a failure in which a failure location cannot be identified only by the result of failure diagnosis, there is a technology for monitoring a sensor signal and confirming the presence or absence of a sensor signal indicating an abnormality at the time of occurrence of the failure to identify the failure location. There is known a method of connecting a failure diagnosis device to an electronic control device and recording data such as sensor signals in the electronic control device in a memory of the failure diagnosis device by communication (Japanese Patent Laid-Open No. 8-166328).
[0005]
[Patent Document 1]
Japanese Patent Application Laid-Open No. 8-166328 (pages 4 to 6, FIGS. 1 and 7)
[0006]
[Problems to be solved by the invention]
In the above-mentioned conventional technology, a portable failure diagnosis device is connected to the electronic control unit to perform data measurement. Therefore, it is necessary to connect the failure diagnosis device until intended data is measured. However, since the failure diagnosis device is not originally installed in the vehicle and is mainly used for inspection work of the vehicle at a repair shop such as a dealer, for example, when diagnosing a failure that occurs infrequently, In such a method, it is necessary to mount the diagnostic device on a specific vehicle for a long time, and there is a problem that work efficiency in a repair shop is reduced.
[0007]
Further, in the above-described conventional technology, a measurement start condition (for example, when a failure is detected) and an item of data to be measured and stored (a measurement item) are previously incorporated into a control program of the electronic control device, and after a failure is detected, By reading the stored data by connecting a failure diagnosis device from the outside, it is possible to perform measurement by the electronic control device alone. However, in this case, since the measurement start condition and the measurement item cannot be changed, there is a problem that it is difficult to perform data measurement according to the failure content.
[0008]
The present invention has been made in view of such a problem, and an object of the present invention is to store measurement data with an electronic control device alone and to select data items and measurement conditions to be measured and stored. It is to provide a possible electronic control unit.
[0009]
[Means for Solving the Problems]
The data of each item is stored in a time-series manner in a memory built in the electronic control unit, and the data can be taken out by connecting an external failure diagnosis device when necessary. Further, it is possible to input data items and measurement conditions to be measured and stored from the failure diagnosis device to the electronic control device.
[0010]
BEST MODE FOR CARRYING OUT THE INVENTION
The electronic control device according to the first aspect of the present invention connects a portable failure diagnostic device to the electronic control device when setting a measurement item, a trigger condition for starting measurement, and a measurement period. The conditions and measurement period are input to the failure diagnosis device. The input contents are transmitted to the electronic control unit through communication, and are recognized as a measurement item, a trigger condition, and a measurement period. After the input is completed, regardless of whether the failure diagnosis device is connected or not, after the determination of the trigger condition and the satisfaction of the condition in the electronic control device, the data of the set measurement item is stored in the internal memory of the electronic control device for a set period. To be remembered. The data stored in the memory is connected to and read from a failure diagnosis device.
[0011]
According to a second aspect of the present invention, in the first aspect, a range used for data storage is set in a memory built in the electronic control device, and data is stored in a free area of the memory which can be used for data storage every time measurement conditions are satisfied. Since the configuration is performed, measurement data for a plurality of times can be stored in the memory.
[0012]
According to a third aspect of the present invention, in the first or second aspect, a battery backup power source for retaining the contents of the memory is provided separately from the power source of the electronic control unit. When the power is turned on, the same state as that immediately before the last power-off is maintained, the stored data is not erased, and it is not necessary to set the trigger conditions and the measurement items again every time the power is turned on.
[0013]
In a fourth aspect based on the first to third aspects, a trigger condition set by the failure diagnosis device is set by combining a plurality of results of various determinations performed by a microcomputer in the electronic control unit. It is possible to combine a plurality of various judgment results including a failure diagnosis result as a trigger condition. Since the data measurement is performed at the intended timing by setting the trigger condition in detail according to the failure content, the data is stored. Necessary data can be measured even if the memory area is limited.
[0014]
Hereinafter, embodiments of a vehicle electronic control device according to the present invention will be described in detail with reference to the drawings.
[0015]
FIG. 1 shows the overall configuration of a vehicle electronic control device according to the present embodiment.
[0016]
An electronic control unit 2 is mounted on the vehicle 1 and is connected to a failure diagnosis unit 4 via a communication connector 3.
[0017]
Further, various electronic control devices 2 are mounted on the vehicle 1, but a plurality of electronic control devices may be connected to the failure diagnosis device 4.
[0018]
FIG. 2 shows a configuration of the electronic control unit 2.
[0019]
The electronic control unit 2 is of a computer type, and includes a CPU 5 for performing arithmetic processing, a clock generator 6 for generating a reference time (clock signal), a ROM 7 for storing a control program and the like, and a RAM 8 for storing a calculation result. , An input / output interface (I / O) 9, an analog input circuit 10, a digital input circuit 11, an output circuit 12, and a communication circuit 13 for communicating with the outside.
[0020]
Although not shown, various sensors and switches are connected to the digital input circuit 11 and the analog input circuit 12, and various actuators are connected to the output circuit 10.
[0021]
In the electronic control unit 2, an operation is performed using signals input from the analog input circuit 10 and the digital input circuit 11 or information received by the communication circuit 13 according to a control program stored in the ROM 7.
[0022]
The calculation result is temporarily stored in the RAM 8, and part of the calculation result is referred to when generating a drive signal for driving the actuator from the output circuit 10, or is transmitted to the outside via the communication circuit 13. The calculation is repeatedly performed at a predetermined cycle such as 10 ms (hereinafter referred to as a control cycle), and the value temporarily stored in the RAM 8 is rewritten as needed.
[0023]
Next, a control system for measuring and storing data will be described with reference to FIG.
[0024]
The failure diagnosis device 4 and the electronic control device 2 can transmit and receive communication data and exchange information.
[0025]
The failure diagnosis device 4 includes a communication unit 14 for transmitting and receiving communication data to and from the electronic control device 2, a display device 15, and an input device 16.
[0026]
The failure diagnosis device 4 transmits to the electronic control device 2 communication data according to the content of the trigger condition and the like input by the operator using the input device 16.
[0027]
In the electronic control unit 2, the communication data transmitted from the failure diagnosis device 4 is received by the communication unit 17. The communication means 17 determines whether or not the received communication data should be processed by the electronic control unit 2. If the communication data is to be processed, the communication data is sent to the measurement condition setting means 18.
[0028]
The measurement condition setting unit 18 analyzes the communication data in the manner described in detail with reference to FIGS. 4 to 8 and recognizes the measurement trigger condition, the measurement item, the measurement cycle, and the measurement period, and appropriately inputs the information to the measurement timing determination unit 19. This is sent to the storage data updating means 20.
[0029]
The measurement timing determination means 19 instructs the storage data update means 20 to store the data of the measurement items in a time series at each measurement cycle. Also, the measurement trigger condition is monitored, and after the measurement data is continuously stored for the measurement period from the time when the condition is satisfied, the measurement is stopped.
[0030]
The storage data updating unit 20 sends the value of the RAM 8 in the area corresponding to the measurement item to the measurement data storage unit 21 at each timing specified by the measurement timing determination unit 19.
[0031]
The measurement data storage means 21 stores the data in a measurement data storage area provided in the RAM 8 in time series.
[0032]
In this manner, the electronic control unit 2 performs the measurement process according to the measurement conditions input to the failure diagnosis device 4 by the operator, and the data of the items is stored in the RAM 8 in time series.
[0033]
When communication data indicating reading of measurement data is received from the failure diagnosis device 4, the measurement data stored in the RAM 8 is sequentially transmitted in time series to the failure diagnosis device 4 via the communication unit 17 by the data reading unit 22. I do.
[0034]
The failure diagnosis device 4 can display the received measurement data on the display device 15 in the form of a graph or a numerical value to inform the operator of the contents of the measurement data.
[0035]
An example of a method for setting a trigger condition will be described with reference to FIGS.
[0036]
The trigger condition is transmitted as communication data from the failure diagnosis device 4 to the electronic control device 2 as shown in FIG. This data is sent in a plurality of pieces of data. For example, in the example shown in FIG. 4, there are three stages (1) to (3).
[0037]
The electronic control unit 2 analyzes each communication data and, if there is no error, recognizes it as a trigger condition and returns an affirmative response, and if there is an error, returns communication data indicating a negative response meaning that the trigger condition could not be set. .
[0038]
The communication data is roughly divided into four parts as shown in FIG.
[0039]
In the header portion, values indicating the type of communication data configuration, the transmission source, the reception destination, and the sum of the numbers of data in the command portion and the data block portion are set from the top.
[0040]
In the electronic control device 2, an identification number different for each electronic control device is set in the control program, and the electronic control unit 2 is programmed to process communication data only when the value of the destination is the identification number indicating itself.
[0041]
For this reason, even when a plurality of electronic control devices are connected to the failure diagnosis device 4, only the electronic control device designated as the receiving destination processes communication data.
[0042]
In the command section, a value indicating the type of the data block is set, and the electronic control unit 2 at the receiving end switches the processing method of the subsequent data block according to the value of the command.
[0043]
The data block will be described with reference to FIGS.
[0044]
In the sum value part, the lower two digits of the sum of each value except the sum value of the communication data are set. By performing the same summation calculation at the receiving end and comparing the calculation result with the sum value, the sum is used for a communication error determination by a sum value check for determining whether or not communication data has been correctly received.
[0045]
FIGS. 6 to 8 show examples of the data block portion of the communication data (1) to (3) in FIG.
[0046]
FIG. 6 is for setting a trigger condition.
[0047]
In the data block portion, three pieces of data are processed as one set and recognized as one condition. In FIG. 6, the trigger condition is composed of a combination of three conditions.
[0048]
In the data of each condition, the first data corresponds to “No” in FIG. 9 and the second data corresponds to “bit” in FIG. 9, and represents the content of the condition. Indicates whether a condition (logical product) or an OR condition (logical sum) is satisfied. In the example of FIG. 6, the AND condition is described as “*” and the OR condition is described as “+”. However, since the last condition (condition 3 in FIG. 6) does not have a subsequent condition (after condition 3 in FIG. 6), the third data (shaded portion in FIG. 6) is ignored.
[0049]
Therefore, in the example of FIG. 6, the trigger condition is set as follows.
[0050]
"At the time of acceleration judgment AND at the time of engine stall OR at the time of sensor 8 failure"
FIG. 7 is for setting measurement items.
[0051]
Each piece of data in the data block corresponds to “No” in FIG. 10 and represents a measurement item to be stored. In the example of FIG. 7, the throttle opening, the intake pipe pressure, and the engine speed are set as measurement items.
[0052]
9 and 10 are incorporated in the control program stored in the ROM 7, and the measurement condition setting means 18 appropriately determines which condition or item in the table the received communication data corresponds to, Be recognized.
[0053]
FIG. 8 sets a measurement cycle and a measurement period.
[0054]
The measurement cycle is set as a multiple of the control cycle. For example, when the control cycle is 10 ms, since FIG. 8 shows ＄ 64 (hexadecimal number), 10 × 100 = 1000 ms is the measurement cycle.
[0055]
In the measurement period, the number of times of storing the measurement data is designated with the time when the trigger condition is satisfied from the non-satisfaction being satisfied as the base point, the time before the base point as the previous period, and the time after the base point as the subsequent period.
[0056]
In FIG. 8, the preceding period is set to four times, and the following period is set to seven times. Since the storage of the measurement data is performed for each measurement cycle, “(previous period + back period) × measurement period” is the measurement time.
[0057]
As described above, the communication data from the failure diagnosis device 4 is recognized and set by the electronic control device 2 as a measurement condition.
[0058]
An example of the method of setting the measurement conditions described above will be described in detail with reference to the flowchart of FIG. The measurement condition setting routine is executed in a control cycle (for example, every 10 ms).
[0059]
First, when communication data is received from the failure diagnosis device 4, when a sum value error is detected as described with reference to FIG. 5 or when communication data is not to be processed by the electronic control device based on a value of a reception destination, Alternatively, if the communication data has not been received (No at Step S101), the subsequent processing is passed and the processing ends. If the communication data is to be processed by the electronic control device (Yes at step S101), one of the commands (1) to (3) is selected according to the value of the command section.
[0060]
If the command is (1) (Yes at step S102), the data block portion is divided into three data units as described with reference to FIG. 6, and the first and second combinations of the divided data groups are shown in the table of FIG. If not set or if the third data is not a value indicating an AND or OR condition, it is determined that the condition was not correctly recognized as a condition (No at Step S103), and a negative response is transmitted to the failure diagnosis device (Step S107). . If neither is the case, it is recognized as one of the measurement conditions (step S104). If there is unprocessed data in the data block portion (No at Step S105), the same determination is made. If the determination is completed for all data (Yes at Step S105), it is recognized that the processing of the command (1) is completed (Step S106). Then, an acknowledgment is transmitted to the failure diagnosis device (step S108).
[0061]
If the command is (2) (Yes at Step S113), as described with reference to FIG. 7, if each data of the data block is not set in the table of FIG. 10 (No at Step S114), a negative response is diagnosed as failure. It is transmitted to the device (step S107), otherwise (step S114: Yes), it is recognized as a measurement item (step S115). If there is remaining data in the data block portion (No at Step S116), the same determination is made. If the determination is completed for all data (Yes at Step S116), it is recognized that the processing of the command (2) is completed (Step S117). An acknowledgment is transmitted to the failure diagnosis device (step S108).
[0062]
If it is the command (3) (Yes at Step S118), the measurement cycle and the number of times of storing data are recognized from the data block portion as described with reference to FIG. The measurement cycle is set as a threshold value to be compared with a cycle timer that counts up for each control cycle during measurement (step S119). Next, an area for storing data is secured in the RAM 8 (step S120). As shown in FIG. 12, the RAM 8 is divided into an area used by the control program and an area used to store measurement data (hereinafter, measurement data storage area). If the memory size obtained by (number of times of storing data) × (measurement item) is larger than the measurement data storage area (No at step S121), the data of the requested number of times cannot be stored, so a negative response is sent to the failure diagnosis device. Otherwise (step S107). If not, it secures a memory range for storing measurement data, recognizes that the processing of the command (3) is completed (step S122), and transmits an acknowledgment to the failure diagnosis device (step S108).
[0063]
Next, if any of the commands (1) to (3) is not completed (No at Step S109), the process is terminated and the next communication data is awaited. If all of the commands (1) to (3) have been completed (Yes at Step S109), the period timer is cleared (Step S110), and a counter for counting the number of storages described with reference to FIG. 15 is cleared (Step S111). The measurement is started (step S112), and the measurement condition determination routine ends.
[0064]
As described above, the determination process of the measurement condition described with reference to FIGS. 6 to 8 is performed.
[0065]
Next, an example of the measurement processing routine will be described with reference to the flowchart in FIG.
[0066]
The measurement processing routine is executed every control cycle (for example, every 10 ms).
[0067]
If the measurement described with reference to FIG. 11 is not started (step S112) first (No at step S201), the process ends. If the measurement is started (step S201 affirmative), the period timer sets the measurement described with reference to FIG. If it is less than the cycle (No at Step S202), the cycle timer is counted up (Step S205). If the cycle timer is equal to or longer than the measurement cycle (Yes at Step S202), the cycle timer is cleared (Step S203). It is stored in the storage memory range (step S120) (step S204).
[0068]
Here, as shown in FIG. 14, the measurement data is sequentially stored from the head (point A) of the measurement data storage memory range (step S120) secured in the RAM 8, and when the end of the memory range (point B) is reached. The system is configured to return to the top (point A) and perform the overwrite update, and the update is continuously performed until the measurement ends.
[0069]
Next, the trigger condition described with reference to FIG. 6 is determined (step S206). If the trigger condition is not satisfied (step S206: No), the process is terminated. If the trigger condition is satisfied (step S206: Yes), the trigger is performed. A counter for counting the number of times of storing the measurement data after the condition is satisfied is counted up (step S207).
[0070]
If the counter is equal to or less than the number of times after the period described with reference to FIG. 8 (No at Step S208), the process ends, otherwise, the measurement ends (Step S209).
[0071]
When the measurement is completed, the measurement data before the measurement trigger condition is satisfied and the measurement data after the measurement trigger condition is satisfied are stored in the measurement data storage memory range as shown in FIG. The number of times of the period is stored.
[0072]
If the location where the measurement data is stored last is point C in FIG. 14, for example, the data following point C (point D) is the first in time series, so that the measurement data can be read out in time series. is there.
[0073]
As described above, the measurement data can be stored in chronological order according to the measurement conditions described with reference to FIG.
[0074]
FIG. 15 is a timing chart showing an example of the measurement processing described above.
[0075]
The conditions 1 to 3 are the measurement trigger conditions described with reference to FIG. 6, and the condition 1 is satisfied at the point E and the condition 2 is not satisfied at the point F. Condition 3 remains unsatisfied.
[0076]
The cycle timer generates the timing for storing the measurement data as described in FIG. 8, and counts up in each control cycle (for example, every 10 ms) and clears in each set measurement cycle as described in FIG. Is done. The storage of the measurement data is performed at the timing when the cycle timer is cleared (the dotted line in FIG. 15).
[0077]
The charts of items 1 to 3 represent the measurement items to be stored described with reference to FIG. A value that changes with time is stored for each measurement cycle.
[0078]
The counter is counted up every measurement cycle after the measurement trigger condition is satisfied as described with reference to FIG. 13, and the measurement ends when the counter value matches the later period described with reference to FIG.
[0079]
The pre-period and the post-period indicate the number of measurement data to be stored before and after the measurement trigger condition as described with reference to FIG. In FIG. 14, since the previous period is set to four times and the subsequent period is set to seven times, the measurement data of the circles from item 1 to measurement 3 are stored in the memory.
[0080]
In this way, the measurement data is stored in the memory built in the electronic control device according to the measurement conditions set by the failure diagnosis device. The measurement data stored in the memory is not shown, but after the measurement is completed, the failure diagnosis device is connected to the electronic control unit, read out, and displayed on the failure diagnosis device, thereby collecting the measurement data for specifying the failure location. I can do it.
[0081]
【The invention's effect】
Since the present invention is configured as described above, data of items indicating various states of the vehicle can be stored in a memory built in the electronic control device in time series, and the measurement items and the measurement conditions are selected and set. Since it is not necessary to separately connect a failure diagnosis device or the like during data measurement, the configuration is inexpensive and the number of steps in the operation for specifying the failure location can be reduced.
[Brief description of the drawings]
FIG. 1 is an overall configuration of a vehicle including a failure diagnosis device according to an embodiment.
FIG. 2 is a diagram illustrating a configuration of an electronic control device.
FIG. 3 is a block diagram illustrating a control system of the failure diagnosis device according to the embodiment.
FIG. 4 is a diagram showing a communication order performed between the failure diagnosis device and the electronic control device.
FIG. 5 is a diagram showing a configuration of communication data.
FIG. 6 is a diagram illustrating an example of a data block for setting a trigger condition.
FIG. 7 is a diagram illustrating an example of a data block for setting a measurement item.
FIG. 8 is a diagram showing an example of a data block for setting a measurement cycle and a measurement period.
9 is a diagram illustrating an example of a relationship between a value set in a data block in FIG. 6 and a corresponding trigger condition.
FIG. 10 is a diagram illustrating an example of a relationship between a value set in a data block in FIG. 7 and a corresponding measurement item.
FIG. 11 is a flowchart illustrating an example of a measurement condition setting routine.
FIG. 12 is a diagram showing a use of a RAM in the electronic control device.
FIG. 13 is a flowchart illustrating an example of a measurement processing routine.
FIG. 14 is a diagram showing an order in which measurement data is stored in a RAM in the electronic control device.
FIG. 15 is a timing chart showing a period in which measurement data is stored.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... vehicle, 2 ... electronic control device, 3 ... connector, 4 ... fault diagnosis device, 8 ... RAM, 13 ... communication circuit, 15 ... display device, 18 ... measurement condition setting means, 19 ... measurement timing determination means, 20 ... Storage data updating means, 21: measurement data storage means, 22: data reading means.

Claims (11)

In a vehicle electronic control device for controlling a vehicle,
Means for storing data of items indicating various states of the vehicle in chronological order, means for communicating with the outside of the electronic control unit for a vehicle, conditions for starting storage, and data for any of the items Means for storing the
An electronic control device for a vehicle, wherein a condition for starting the storage and a data item to be stored among the items are set by communication with the outside. 2. The vehicle electronic control device according to claim 1, wherein the means for storing the data of the items indicating various states of the vehicle in a time series is a built-in memory. 2. The storage device according to claim 1, wherein the means for storing data of items indicating various states of the vehicle in time series, the condition for starting the storage, and the means for storing which item data of the items are stored are the same. An electronic control unit for a vehicle, which is a medium. 4. The vehicle electronic control device according to claim 3, wherein the same storage medium is a built-in memory. 5. The storage area setting unit according to claim 4, further comprising a storage area setting unit that sets a range of a memory used to store data of items indicating various states of the vehicle in time series. The electronic control unit for a vehicle is characterized in that data storage is repeatedly performed every time a condition for starting the storage is satisfied until there is no area in which data has not been stored. 2. A device according to claim 1, further comprising means for maintaining the stored data and the conditions for starting the set storage until the next power-on of the vehicle electronic control device in the same state as immediately before the last power-off. Vehicle electronic control device. 2. The electronic control device for a vehicle according to claim 1, wherein the condition for starting the storage can be set by combining a plurality of various determination results performed in the electronic control device for the vehicle. An electronic control unit for a vehicle, comprising: storage means for storing data of items indicating various states of the vehicle in a time series in a memory built in the electronic control unit for a vehicle, and communication means for communicating with an external failure diagnosis device. A trigger condition setting means for setting at least an item of data to be stored in the memory and a trigger condition for starting storage using communication from the failure diagnostic apparatus; and data of the item in the memory activated by the trigger condition. And a reading means for reading out the data stored in the memory from the failure diagnosis device. A storage area setting means for setting a range of a memory used for storing data is provided, and the memory area set by the storage area setting means is used for each time the trigger condition is satisfied until there is no area where data is not stored. 9. The electronic control unit for a vehicle according to claim 8, wherein the storage means repeatedly stores data. 10. The electronic control device for a vehicle according to claim 8, wherein the data, trigger conditions, and measurement items stored in the memory are backed up by a battery. 10. The electronic control device for a vehicle according to claim 7, wherein the trigger setting condition can be set by combining a plurality of various determination results performed in the electronic control device for a vehicle.

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