JPH06178355A - Instrument device for vehicle - Google Patents

Abstract

PURPOSE:To eliminate the unnaturalness of the indication of an indicator when an error occurs in a data transmission and a transmission delay occurs in an instrument device for vehicle which transmits the measured value, etc., of an object to be measured to the side of a display part to be a reception part via a proper communication means, performs the processing of a received value in the display part and performs the display of the indicator indication corresponding to the measured value. CONSTITUTION:In a display part to be a reception side 1, an estimation processing part provided with the memory function of a received value (a memory part 33 (storage of received values of the last time and the last but one)), the discimination function of the presence or absence of a data reception at a preliminarily fixed interval (a reception interval counter 32), and a function estimating and calculating the data at a pertinent time when the data reception does not exist (a processing part 34 (decision of estimation processing)) is installed. A prescribed indicator instruction is performed based on reception data at a normal time, the data value at the pertinent time is estimated and calculated based on the change of a previously latched data value when a data transmission does not exist, and the indicator instruction of the calculated result is performed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle instrument device that employs data communication of measured values of an object to be measured.

[0002]

2. Description of the Related Art Various sensor parts of a vehicle are connected with a meter for displaying data of the sensor part by a wire harness so that measured values of the sensors are connected to a display part by serial data communication. With the reduction in weight, the number of vehicles using the multiplex transmission device that abolishes the wire harness and replaces this with a multiplex transmission cable to transmit signals is increasing. This is because each signal output from each sensor is encoded by an interface provided for each sensor, time-division multiplexed and transmitted to the multiplex transmission cable, and each processing device that receives and processes these signals is
The address bit of the transmitted signal is read to determine whether the signal is a self-processing signal, and if so, processing such as parity check is processed by the interface provided for each.

[0003]

By the way, the respective processing devices in the above-mentioned multiplex communication means include various types, such as air conditioners, power windows, navigation devices, speedometers, engine tachometers, etc. It is usual that each signal transmitted to the device has a priority. For example, the power window signal must be processed at the same time when the switch is turned on and off, so that it is processed with priority over any other signal.

However, while this signal occupies the transmission cable, other signals are waiting for transmission. However, for devices such as speedometers, engine tachometers, and navigation devices that constantly measure and display or indicate changes in the measured object, while the high-priority signal occupies the transmission cable, that is, while waiting for transmission. If the condition continues, the time from the output of the signal from the sensor in the measuring device to the processing by the processing device becomes long, which is one of the factors that cannot linearly display and switch the instruction.

Also in the serial data communication, if the measured values of the sensor unit are not communicated at a predetermined interval due to some communication error or the like, the pointer indication becomes unnatural. In view of this, the present invention proposes a vehicular instrument device that employs a communication means that allows a pointer to be smoothly indicated even if data transmission is delayed.

[0006]

A vehicle instrument device according to the present invention is a device that employs a communication means for data transmission, wherein a display unit on the receiving side has a memory function of a received value and a predetermined value. The present invention is characterized in that an estimation processing unit having a function of discriminating whether or not data is received at different intervals and a function of estimating and calculating data at that time when no data is received is additionally provided.

Further, in the above apparatus, especially in the estimation processing section, when the number of times data cannot be received is more than a predetermined number, it is possible to distinguish the pointer instruction and recognize the pointer instruction as a failure instruction and display a pointer instruction operation signal or other warning. It is characterized by adding a failure discrimination function for outputting an operation signal.

[0008]

In the normal operation, the data from the transmitting side is processed by the receiving side, and a predetermined pointer instruction is given. During this operation, the data is appropriately latched in memory, and when there is no data transmission,
The data value at that time is estimated and calculated based on the change in the latched previous data value, and the calculation result is instructed. Further, when the data transmission is interrupted for a long time, the driver is informed of the failure by the pointer indicating state or another notifying means without judging the failure and performing the above estimation calculation.

[0009]

EXAMPLES Next, examples of the present invention will be described. The vehicle instrument device shown in the embodiment of the present invention comprises a transmission side 1, a communication line 2 and a reception side 3, and the transmission side 1 shows a sensor unit for detecting a state of a predetermined measurement target and a measurement value of the sensor unit. The data signal is sent to the receiving side and, for example, in the case of displaying the vehicle speed, the transmitting side 1 has a counting circuit for a reference clock signal generated during one cycle of a signal of a vehicle speed pulse output at every constant traveling distance, A transmission sampling clock generating circuit, an interface circuit and the like are provided, and the vehicle speed data is sent to the receiving side at a predetermined time interval by a signal corresponding to the communication line 2.

The communication line 2 is formed of a multiplex communication cable or a wire harness. The reception unit 3 includes a reception circuit 31, a reception interval counter 32 that constitutes an estimation processing unit,
The reception data memory unit 33 and the processing unit 34, the drive output unit 35, the pointer display unit 36, and the warning unit 37 are provided, and the reception circuit 31 includes a predetermined interface circuit. The vehicle speed data is calculated on the basis of the signal, and the received data is received by the reception interval counter 32 and the memory unit 3.
3 is sent to the processing unit 34.

The reception interval counter 32 counts a predetermined reception interval and determines whether or not the data is received at a predetermined interval. The memory unit 33 sequentially latches the reception data (vehicle speed data). The processing unit 34 sends a data signal to the drive output unit 35 on the basis of the received data (vehicle speed data) or data obtained by a predetermined estimation calculation, and sends a warning operation signal to the warning unit 37 at the time of failure judgment. Is to be sent.

The pointer display section 36 is an instrument for indicating the pointer, such as a cross coil type pointer instrument, and the drive output section 35.
Is a display unit 3 such as a drive circuit of a cross coil type instrument.
The driving unit 6 drives the warning unit 37, and when the warning unit 37 receives the warning operation signal, it gives a predetermined warning notification (warning sound, warning light, etc.).

From time t0, t1, t2, t3
When the vehicle speed data D0, D1, D2, D3 are respectively transmitted to the receiving side 3 from the transmitting side 1, the display unit 36 of the receiving side 3
Then, the pointer instruction corresponding to the data D0, D1, D2, D3 is given. Further, when the data D4 is not transmitted at t4, the transmission error itself can be determined by the fact that there is no data input while the reception interval counter 32 has counted for a predetermined time, and the processing unit which has received no data input. 34
Then, the data at that time (t4 o'clock) is estimated from the previous data D3 latched in the memory unit 33 and the data D2 two times before. That is, assuming that the time from the previous data D3 to the estimated data d4 is T, the estimated data d4 is d4 = D3 +
When the estimated data d4 is calculated based on T × (D3−D2) ÷ (t3−t2), the data is displayed based on the data d4, and the next time (t5 o'clock) data is input, that time (t5 o'clock)
In addition, the pointer is instructed based on the data D5.

Therefore, for example, when the vehicle speed is changing as illustrated in FIG. 2, the vehicle speed is displayed based on the estimated data d4 even when there is no data transmission at t4, and the pointer indication is smooth during acceleration or deceleration. It changes to.

Further, when the reception interval counter 32 recognizes that the received data is not continuously input for a predetermined time, the processing section 34 judges that the transmitting side 1 or the communication line 2 is out of order, and operates the warning section 37. Excuse me.

The present invention is not limited to the above-mentioned embodiment, and the object of measurement is an engine speed other than the vehicle speed or any other object, and the present invention determines the unreceived data value based on the received data value. Any means can be used as long as it can be estimated, and the means for storing the received data value and the estimation calculation means can be arbitrarily determined.

[0017]

As described above, according to the present invention, in the instrument device which employs the communication means for the data transmission between the sensor section and the display section, the display section on the receiving side stores the received value memory. It is equipped with an estimation processing unit that has a function and a function of determining whether or not data is received at a predetermined interval, and a function of estimating and calculating the data at the time when there is no data reception. Even if it occurs, since the revised value is calculated and displayed, the pointer instruction can be a smooth and natural operation.

[Brief description of drawings]

FIG. 1 is a block diagram showing an embodiment of the present invention.

FIG. 2 is a graph of data and time for explaining the operation of FIG.

FIG. 3 is a graph of relaxation and data for explaining the operation of the present invention.

[Explanation of symbols]

 1 Transmission Side 2 Communication Line 3 Reception Side 31 Reception Circuit 32 Reception Interval Counter 33 Memory Section 34 Processing Section 35 Drive Output Section 36 Pointer Display Section 37 Warning Section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Naosuke Hayakawa 1-190-1, Fujihashi, Nagaoka-shi, Niigata Nihon Seiki Co., Ltd. R & D Center

Claims (4)

[Claims] 1. A vehicle for transmitting a measured value or the like of an object to be measured to a display side, which is a receiving section, through an appropriate communication means, processing the received value on the display section, and displaying a pointer indication corresponding to the measured value. In the instrument device, the display unit has a memory function of received values, a function of determining whether data is received at a predetermined interval, and a function of estimating and calculating data at that time when no data is received. An instrument device for a vehicle, which is provided with an estimation processing unit. 2. The vehicular measuring device according to claim 1, wherein when the number of times data cannot be received is greater than or equal to a predetermined number in the estimation processing unit, the indicating device can be identified as a measuring device failure and the pointer can be recognized as a failure instruction. An instrument device for a vehicle, further comprising a failure determination function of outputting an instruction operation signal or another warning display operation signal. 3. The vehicle instrument device according to claim 1 or 2, wherein the communication means employs multiplex communication. 4. The vehicle instrument device according to claim 1 or 2, wherein serial data communication is adopted as a communication means.