JPH0774744B2 - Vehicle data recording device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle data recording device for recording data indicating various state quantities of a vehicle, and more particularly to a vehicle data recording device in which the recorded data is stored in a semiconductor memory. Regarding

<< Background of the Invention >> An apparatus of this type is known from JP-A-57-182298, and an example of a conventional apparatus is shown in FIG.

Sensors 10-1, 10-2 ... 10-N shown in the figure are attached to various parts of the vehicle, and various state quantities such as temperature and stress are detected by the sensors 10-1, 10-2 ... 10-N. Has been done.

These detection signals are supplied to the input interface 14 of the writing device 12 via the connector 16, and the detection signals captured via the input interface 14 are CP.
It is processed with U18.

Further, the recorded data obtained by the processing is written in the RAM 22 connected to the writing device 12 and the connector 20.

The writing device 12 is provided with a ROM 24 in which a control program for the CPU 18 and the like are stored.

Data recording is performed in this manner, and this data recording is performed for a long time.

When the data recording is completed, the RAM 22 is detached from the writing device 12 from the connector 20, and the processing device 26 is connected to the connector 20 as shown in FIG.

Then, the recorded data in the RAM 22 is read out to the processing device 26 side, statistical processing using the read-out data is performed,
Further, display processing of graphs, tables, etc. is performed.

However, in the conventional device, since the connector 20 is placed in a harsh environment while the vehicle is running, contact failure is likely to occur in the connector 20, and therefore the recorded data in the RAM 22 may be destroyed. There was a problem that the reliability of could not be secured.

<Object of the Invention> The present invention has been made in view of the above-mentioned conventional problems,
An object of the invention is to provide a vehicle data recording device capable of ensuring the reliability of recorded data.

<< Structure of the Invention >> In order to achieve the above object, the present invention is configured as shown in FIG. 1, and one of a sensor for detecting various state quantities of a vehicle or an external device is selectively connected. Connector a, a semiconductor memory b that stores the detected state quantity of the sensor taken in through the connector a after converting it into recorded data, and if the signal applied to the connector a is within a predetermined range, the sensor and the connector a is determined to be connected, and if it is outside the predetermined range, the connection determination means c determines that the external device that uses the recorded data is connected to the connector a, and the connection determination means c determines the sensor and the connector. When it is determined that a is connected, the recording data writing means d for writing the recording data in the semiconductor memory b and the connection determining means c connect the external device and the connector a. If it is determined to be characterized by having a a recording data sending means e for sending via said connector a to the external device recording data read from the semiconductor memory b.

<< Embodiment of the Invention >> A preferred embodiment of an apparatus according to the present invention will be described below with reference to the drawings. In FIG. 4, a RAM 22 is a connector 22 shown in FIGS. 2 and 3.
Is directly connected to the writing device 12 without using
They are integrated.

When recording data, the sensor 10
-1, 10-2 ... 10-N are connected in advance, and the connector
These detected state quantities are captured by the input interface 14 via 16.

The input interface 14 has sensors 10-1, 10-
A plurality of waveform shaping circuits and differential amplifier circuits are provided corresponding to 2 ... 10-N, and each detection signal is amplified after waveform shaping.

And this input interface 14 has a multiplexer,
The A / D converter is also built in, and each amplified detection signal is converted into a serial digital signal by them.

The vehicle-side data obtained by the input interface 16 in this manner is supplied to the CPU 18, and the CPU 18 obtains the recorded data by processing them.

Further, the recorded data is written in the RAM 22, and the data recording is performed for a long time.

Then, when the data recording is completed, the processing device 26 is connected to the connector 16 as shown in FIG. 5, and the value data Dt is given from the processing device 26 to the connector 16.

The value data Dt is set to a range other than the range D ₀ ≧ D ≧ D ₁ that the sensor output D can take during data recording. For example, the value Dt <D ₁ is selected.

When this value data Dt is given, the CPU 18
The connection of the processing device 26 to the processing device 26 is confirmed, and when the confirmation is made, the recording data is read from the RAM 22 and the recording data is sent to the processing device 26 via the connector 16 by the transfer interface 28.

A predetermined procedure between the transfer interface 28 and the processing unit 26, that is, the data signal DAT as shown in FIG.
A, strobe signal STROBE, ready / busy signal READY / B
Data transfer is performed by the procedure of 2-wire hide shake by USY.

The present embodiment has the above-mentioned structure, and its operation will be described below.
This will be described with reference to the flowcharts of FIGS. 7, 7 and 8.

In the processing of FIG. 6, the operation mode of the apparatus of this embodiment is determined, and the transfer interface 28 is first turned off (step 100).
The signal line on the 6 side has a high impedance, and as a result, adverse effects on the signal applied to the connector 16 are prevented in advance.

Next, the data D is taken in from the connector 16 by the input interface 14 (step 102), and the data D has the value D _0.
To D ₁ is determined (step 10).
Four).

At this time, when it is determined that the input data D is within the value range D _{0 to} D ₁ , the sensors 10-1 and 10 are connected as shown in FIG.
-2 ... 10-N is connected to the connector 16, so that the recording routine of FIG. 7 for recording data is started (step 106).

When it is determined that the value of the input data D is not within the range D _{0 to} D ₁ , the processing device 26 is connected to the connector 16 as shown in FIG. 5, and therefore the recording data is transferred. The process shown in FIG. 8 is started (step 10).
8).

In the recording routine shown in FIG. 7, the transfer interface is used.
28 is turned off again (step 110), then sensor 10-
One of the detection signals obtained at 1, 10-2 ... 10-N is selected by the multiplexer of the input interface 14, and the detection signal is converted into a digital signal by the A / D converter and taken in. (Step 112).

Then, the CPU 18 performs predetermined processing on the data (step 114), and the processed data is stored in the RAM 22 as recorded data (step 116).

The above processing is repeated, for example, with 1 second being synchronized, but in step 112, the sensors of the sensors 10-1 and 10-2 are processed by the multiplexer of the input interface 14 at each processing cycle.
... 10-N detection signals are selected in a predetermined order, and RA
The processed data is stored in the M22 as sensors 10-1, 10-2 ... 1
It is stored corresponding to 0-N.

Further, the data processing performed in step 114 is performed in any of a plurality of preset temperature ranges in which the temperature indicated by the signal taken in via the input interface 14 is set, for example, when the sensor 10-1 is a temperature sensor. It is determined whether or not it belongs to, and the measurement time is counted.

Then, at that time, data indicating any of the temperature ranges and the measurement count time are written in the RAM 22 as recorded data (step 116).

When the data recording is performed as described above and then the data recording is completed, the sensors 10-1, 10-2, ...
The -N is removed from the connector 16 and the processor 26 is connected to the connector 16 as shown in FIG.

When the processing device 26 supplies the value data Dt to the connector 16, the transfer routine of FIG. 8 is started (sixth step).
(Figure step 108).

In the transfer routine, the transfer interface 28 is turned on (step 118), then the recorded data stored in the RAM 22 is read (step 120), and the recorded data is further processed through the transfer interface 28 and the connector 16 into the processing device 26. Is output to (step 112).

In the processing device 26, for example, when a temperature sensor is used as the sensor 10-1 and the above-described data processing is performed and the processed data is stored in the RAM 22, the temperature range to which each temperature belongs is indicated. Using the data and the count time, the temperature frequency in each temperature range is obtained over the measurement period, and the temperature frequency distribution is displayed in a graph or table.

By doing so, it is possible to significantly reduce the storage capacity of the RAM 22, and since the preprocessing for obtaining the temperature frequency distribution is performed on the apparatus side of this embodiment, the load on the processing apparatus 26 is reduced. .

As described above, according to the present embodiment, since the RAM 22 is directly connected to the writing device 12 without the connector 20, the writing device 12 and the RAM 22 are connected between the writing device 12 and the RAM 22 during a running test of a vehicle exposed to a severe environment. No contact failure will occur, so that the destruction of recorded data can be reliably prevented and its reliability can be secured.

Further, according to the present embodiment, since the connector 20 for connecting the writing device 12 and the RAM 22 and other mechanisms and parts are unnecessary, the device can be downsized, and as a result, the space in the vehicle can be effectively used. It becomes possible to use.

In particular, according to this embodiment, the routine of FIG. 7 and the routine of FIG.
There is no need for a switch to switch to the routine in the figure,
For this reason, since only the connector 16 is operated, the reliability of the device can be greatly improved.

<< Advantages of the Invention >> As described above, according to the present invention, the sensor input connector is also used for recording data output, and data recording and recording data transfer are automatically switched. It is possible to greatly improve the reliability and the reliability of the device.

[Brief description of drawings]

FIG. 1 is a diagram corresponding to the claims of the present invention, FIG. 2 is an explanatory diagram of a configuration of a conventional device, FIG. 3 is an explanatory diagram of connection between a RAM 22 and a processing device 26 in the conventional device, and FIG. FIG. 5 is a block diagram for explaining a preferred embodiment of such a device, FIG. 5 is a connection explanatory diagram of FIG. 4 embodiment device and the processing device 26, FIG. 6, and FIG.
8 and 9 are flowcharts for explaining the operation of the apparatus of FIG. 10-1, 10-2 ... 10-N ... Sensor 12 ... Writing device 16 ... Connector 22 ... RAM 26 ... Processing device

Claims (1)

[Claims] 1. A connector for selectively connecting one of a sensor for detecting various state quantities of a vehicle or an external device, and a detected state quantity of a sensor taken in through the connector for converting into recorded data. If the signal applied to the semiconductor memory to be stored and the connector is within the predetermined range, it is determined that the sensor and the connector are connected. If the signal is outside the predetermined range, the external device that uses the recorded data is connected to the connector. Connection determination means for determining that the recording data is written to the semiconductor memory when the connection determination means determines that the sensor and the connector are connected, and the connection determination means When it is determined that the external device and the connector are connected, the recording data read from the semiconductor memory is sent to the external device through the connector. A vehicle data recording device, comprising: a recording data transmission unit that outputs the data.