JP3250323B2 - Vehicle diagnostic system - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a diagnostic system for a vehicle, which stores the state of a vehicle in a recording device and diagnoses the state of the vehicle based on information stored in the recording device.

[0002]

2. Description of the Related Art Conventionally, a vehicle is connected to a control device (ECU) for controlling fuel injection and the like, and various types of vehicle information from the control device are stored in a recording device (data recorder). There is a vehicle diagnostic system that analyzes the state and the like. For example, according to the configuration of the vehicle diagnostic system shown in FIG. 1, the vehicle-mounted battery, the data line from the control device, and the ground are input to the recording device via the connector.

[0003]

In a vehicle diagnostic system in which a recording device is connected to the above-described control device, even if an ignition switch (hereinafter, referred to as IGSW) is turned off, the recording device does not operate the IGSW. Since the state cannot be detected, normal processing during vehicle operation is executed. For this reason, the recording device is supplied with the power consumption when the vehicle is in the driving state even after the IGSW is turned off, so that there is a problem that the vehicle-mounted battery is consumed.

The present invention has been made in view of the above problems, and when the vehicle is in a non-driving state, the recording device controls the power consumption to be smaller than when the vehicle is in a driving state. An object of the present invention is to provide a vehicle diagnostic system that can surely return the recording device to normal control when the vehicle is again driven.

[0005]

In order to achieve the above object, the present invention provides a power supply unit, a control device for controlling a state of a vehicle, and a control unit connected to the control device so as to be able to transmit and receive data. When state information is stored, when the vehicle is in a non-driving state, power consumption supplied from the power supply unit is controlled to be smaller than in the driving state, and the vehicle is in a non-driving state. A recording device that is returned from the low power consumption control to the normal control by a wake-up signal transmitted from the control device when the vehicle enters the driving state, and various vehicle state information transmitted from the control device to the recording device. A transmission buffer that stores the information, a counter that counts the number of pieces of information stored in the transmission buffer, and when it is detected that the vehicle has changed from a non-driving state to a driving state. Setting means for setting a predetermined value preset in the counter, storing the wake-up signal in the transmission / reception buffer corresponding to the predetermined value, and transmitting the signal to the recording device. Technical means called a vehicle diagnosis system is adopted.

[0006]

According to the above-described configuration of the vehicle diagnostic system of the present invention, the recording device which is connected to the control device so as to be able to transmit and receive and stores the vehicle state information of the control device is provided when the vehicle enters the non-driving state. The power consumption supplied from the unit is controlled so as to be smaller than that in the operation state. And when the vehicle changes from the non-driving state to the driving state,
By the wake-up signal transmitted from the control device,
The control is returned from the small power consumption control to the normal control. The transmission buffer stores various vehicle state information transmitted to the recording device, and the counter counts the number of the information.

As described above, when the vehicle is in the non-operation state, the recording apparatus is driven with less power consumption than in the normal control. Therefore, power consumption of the power supply unit is reduced. When the vehicle changes from the non-driving state to the driving state, a predetermined value is set in the counter by the setting means. Then, a wake-up signal is stored in the transmission buffer corresponding to the predetermined value, and this signal is transmitted to the recording device. Thus, when the vehicle changes from the non-driving state to the driving state, the recording device is reliably returned to the normal control.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a vehicle diagnostic system according to the present invention will be described below. FIG. 1 is a configuration diagram of a vehicle diagnostic system including a control device (ECU) 100 and a recording device (data recorder) 200. The control device 100 receives information from a plurality of sensors for detecting various vehicle states and outputs drive signals for driving various actuators for controlling the vehicle based on the vehicle information. Further, the control device 100 is directly supplied with the power supply voltage from the vehicle-mounted battery 110,
A power supply voltage is input via an ignition switch (hereinafter, referred to as IGSW) 120. Further, the control device 100 has a communication terminal for mutually communicating data with the recording device 200.

The recording device 200 is connected to a vehicle-mounted battery 110 via a diagnostic connector 150, a communication terminal of the control device 100,
Earth is connected. FIG. 2 is a configuration diagram of the recording device 200. 210 processes various controls of the recording device 200
The CPU to execute. A communication IC 220 is connected to a communication terminal of the control device 100 and controls data communication executed between the control device 100 and the recording device 200. 23
Reference numeral 0 denotes a power supply unit that supplies a power supply voltage supplied from the vehicle-mounted battery 110 to the CPU 210, the communication IC 220, and the IC card memory 240 in the recording device 200. The IC card memory 240 as recording means is provided in the control device 100.
This stores various vehicle information from the vehicle.

Next, processing in the recording apparatus 200 will be described with reference to FIG. FIG. 3 shows a case where various types of vehicle information from the control device 100 in the recording device 200 are received and stored in the IC card memory 240 as storage means.
9 is a flowchart illustrating a process for detecting a power-off operation by detecting an off-state of the power supply 120; This process is started at predetermined intervals.

In step 500, a request for transmitting vehicle information is transmitted to control device 100. Here, the vehicle information includes abnormality detection information, cooling water temperature, O2 sensor F / B information, vehicle speed,
The engine speed, intake air temperature, etc. At step 510,
At step 500, the presence or absence of a response signal to the transmission request transmitted to control device 100 is detected. If there is a response signal, normal processing of steps 520 and 530 is performed. At step 520, a response signal from the control device 100 is received,
At step 530, the response signal is analyzed and stored in the IC card memory 240. By this normal processing, vehicle information is stored in the IC card memory 240 at predetermined intervals.

On the other hand, if there is no response signal in step 510, it is estimated in step 540 whether or not the IGSW 120 is off. Specifically, when the state where there is no response from the control device 100 to the transmission request continues for a predetermined number of times (timeout), it is estimated that the IGSW 120 is in the off state. If not, the process proceeds to step 500 in order to transmit the transmission request to the control device 100 again.

If a timeout has occurred in step 540, the process proceeds to step 560, in which a power saving operation process for controlling the recording apparatus 200 to supply less power than during normal processing is performed. This power saving operation is performed, for example, by supplying power to the IC card by the power supply unit 23.
In this state, the power is stopped by controlling 0 to save power consumption. Then, when entering this state, the CPU 210 repeats steps 560 and 570 until a wake-up signal is received.

Next, at step 550, it is detected whether or not a wake-up signal sent from the control device 100 to the recording device 200 has been received. The wake-up signal is transmitted to the recording device 200 when the IGSW 120 is turned on and the control device 100 executes the normal control. Then, upon receiving the wake-up signal, the recording apparatus 200 returns from the power save operation state to the normal control state.

Therefore, when the wake-up signal is received in step 550, the IGSW 120 is turned on and the control device 100 performs the normal control. Therefore, the process proceeds to step 500 to return to the normal processing. On the other hand, if the wake-up signal has not been received, the process proceeds to step 560 to execute a power save operation. As described above, when the timeout is detected in step 540 and the IGSW 120 is detected to be turned off, the recording apparatus 200 performs control so as to enter the power save operation mode. Thus, it is possible to prevent the recording device 200 from performing a normal control after the IGSW 120 is turned off and the battery 110 is consumed.

Next, according to the flowchart of FIG.
An initial routine of the control device 100 when W120 is turned on will be described. This routine is executed by the IGSW 120
Is started at the timing when is turned on, and in step 600, $ DATA, which is a predetermined value set in advance to nDATA, is set, and this processing ends.

Here, nDATA indicates the message length of the transmission / reception buffer RBUF [11] for transmitting / receiving data to / from the recording device 200. This transmission / reception buffer RBUF [1
1], nDATA will be described. Transmit / receive buffer RBU
F [11] is an 11-byte buffer as shown in FIG. 8 (a), and data is written to each byte of this RBUF [11] in the order of RBUF [1], RBUF [2],. Then, the number of bytes of the written RBUF [11], that is, the message length of the transmission / reception buffer RBUF [11] is held in the nDATA. For example,
In FIG. 8B, nDATA = 5.

FIG. 5 is a flowchart showing a process of transmitting and receiving data to and from the recording device 200 in the control device 100. In step 700, it is detected whether or not nDATA is 0. If nDATA is not 0, that is, if there is transmission data, the process proceeds to step 710. NDATA at step 710
Is $ FF or not. If nDATA is not $ FF, the process proceeds to step 770. On the other hand, nDATA is $ F
F, that is, when it is time to transmit a wake-up signal to the recording device 200, step 720
Proceed to. In step 720, the transmission / reception buffer RBUF [1
1], a wake-up signal is set, and step 770 is set.
Proceed to.

If nDATA is 0, that is, if there is no transmission data, the process proceeds to step 730. In step 730, a reception routine for processing a transmission signal from the recording device 200 is executed (details will be described later). NDATA is 0 in step 740
Is detected. nDATA is 0, that is, the recording device 20
If there is no transmission signal from 0, this processing ends. On the other hand, if nDATA is not 0, that is, if there is a transmission signal from the recording apparatus 200, a response process to the transmission signal is performed in steps 750 and 760. In step 750, the content of the transmission request from the recording device 200 is analyzed based on the transmission signal stored in the transmission / reception buffer RBUF [11].
In step 760, a response signal corresponding to the transmission request is set in the transmission / reception buffer RBUF [11], and the message length of the response signal is set in nDATA.
Go to 0.

At step 770, the transmission / reception buffer RBUF
A transmission routine for transmitting a response signal corresponding to the transmission request set in [11] or a wake-up signal to the recording device 200 is executed (details will be described later). FIG. 6 is a flowchart showing the processing of the reception routine in step 730 of FIG.

In step 800, a variable k for detecting the message length of the received data is set to 0. At step 810, the presence or absence of received data is detected. If there is no received data, the process proceeds to step 850. If there is received data, a process of setting the received data in the transmission / reception buffer RBUF [11] is executed in steps 820 to 840.
At step 820, 1 is added to the variable k. Step 83
At 0, one byte of received data is taken into the transmission / reception buffer RBUF [k]. At step 840, it is detected whether or not the received data is end. If the received data is not the end, the process proceeds to step 820, and the processes of steps 820 to 840 are executed again. On the other hand, if the received data is end, the process proceeds to step 850.

At step 850, the variable k is set to nDATA as the message length of the received data. FIG. 7 shows FIG.
36 is a flowchart showing processing of a transmission routine in step 770 of FIG. At step 900, whether or not nDATA is 0 is detected. If nDATA is 0, that is, if there is no data to be transmitted to the recording device 200, this process ends. On the other hand, n
If DATA is not 0, that is, if there is transmission data, the transmission processing of steps 910 to 960 is executed.

In step 910, a variable k for managing the number of bytes output to the transmission / reception buffer RBUF [11] at the current control timing is set to 0. Step 92
When 0, the state of the communication bus is detected. If data cannot be transmitted while the communication bus is busy, transmission at the current control timing is stopped, and the process proceeds to step 960. On the other hand, if the communication bus is not busy and data transmission is possible, the transmission data is transmitted to the recording device 200 byte by byte in steps 930 to 950.

First, at step 930, 1 is added to the variable k. Then, in step 940, the transmission / reception buffer RBU
One byte of the transmission data stored in F [k] is transmitted to the recording device 200. Next, at step 950, the variable k
And nDATA. If the variable k is smaller than nDATA, that is, if the transmission data still exists in the transmission / reception buffer RBUF [11], the process proceeds to step 920 to execute the processes of steps 920 to 950 again. on the other hand,
The variable k is larger than nDATA, that is, the transmission / reception buffer R
If all the transmission data has been transmitted to BUF [11], the process proceeds to step 960.

Then, in step 960, a value obtained by subtracting the variable k from nDATA is set in nDATA. By this processing, when all the transmission data of the transmission / reception buffer RBUF [11] has been transmitted, nDATA becomes 0. Also,
If the transmission process is stopped halfway in step 920,
The untransmitted message length is set in nDATA. As described above, when returning the recording apparatus 200 from the power save operation state to the normal control state, that is, the IGSW
When it is the timing at which the wake-up signal is transmitted to the recording apparatus 200 after the signal 120 is turned on, in step 710 of FIG. 6, nDATA is a predetermined value.
Set to FF. Here, since the number of bytes in the transmission / reception buffer RBUF [11] is 11 as shown in FIG. 8A, the maximum message length of nDATA in normal time is 11. Therefore, a value of $ FF is not normally taken into nDATA.

Therefore, when it is time to transmit a wake-up signal to the recording device 200,
The predetermined value $ FF which is not set during normal control is nDATA
When the IGSW 120 is turned on and the vehicle is driven, the recording apparatus 200 can be reliably returned from the power save operation state to the normal control state.

Since the wake-up signal is transmitted when the IGSW 120 is turned on, no special hardware configuration is required for the recording apparatus 200 to define the timing for transmitting the wake-up signal. Further, a flag for indicating whether or not the wake-up signal has been transmitted has a RAM value (nDATAT) used in normal transmission / reception processing.
Since RAM is also used in A), the number of RAMs for transmitting the wake-up signal does not increase.

[0028]

According to the configuration and operation of the vehicle diagnostic system of the present invention described above, the recording device controls the vehicle so that when the vehicle is in a non-driving state, less power is consumed than during normal control. . At this time, when the vehicle enters the driving state, a predetermined value is set in the counter by the setting means, a wake-up signal corresponding to the predetermined value is stored in the transmission buffer, and the signal is transmitted to the recording device. This makes it possible to reliably return the recording device to the normal control when the vehicle enters the driving state.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of a vehicle diagnostic system according to an embodiment.

FIG. 2 is a configuration diagram of a recording apparatus.

FIG. 3 is a flowchart illustrating various processes in the recording apparatus.

FIG. 4 is a flowchart illustrating an initial routine of a control device.

FIG. 5 is a flowchart illustrating a process of sending and receiving data to and from a recording device in the control device.

FIG. 6 is a flowchart showing a reception routine.

FIG. 7 is a flowchart showing a transmission routine.

FIG. 8 is a diagram illustrating a transmission / reception buffer and nDATA.

[Explanation of symbols]

 REFERENCE SIGNS LIST 100 control device 110 battery 120 ignition switch 150 diagnostic connector 200 recording device

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-58-210340 (JP, A) JP-A-63-138817 (JP, A) Jpn. Field (Int.Cl. ⁷ , DB name) G05B 23/02 B60R 16/02

Claims (1)

(57) [Claims] 1. A power supply unit, a control device for controlling a state of a vehicle, and connected to the control device so as to be able to transmit and receive, and storing the vehicle state information of the control device when the vehicle enters a non-driving state. Controlling the power consumption supplied from the power supply unit to be smaller than that in the driving state, and transmitting the wake transmitted from the control device when the vehicle changes from the non-driving state to the driving state. A recording device that is returned from the small power consumption control to the normal control by an up signal; a transmission buffer that stores various vehicle state information transmitted from the control device to the recording device; and a transmission buffer that is stored in the transmission buffer. A counter for counting the number of information; and setting a predetermined value to the counter when the vehicle is detected to have changed from a non-driving state to a driving state. Vehicle diagnostic system comprising: a setting means this corresponding to a predetermined value is stored the wake-up signal to the transmission and reception buffer, and transmits the signal to the recording device.