JP5170392B2 - Instrument drive - Google Patents

Description

  The present invention relates to an instrument driving device provided separately from a vehicle combination meter.

  Conventionally, it is called an aftermeter that can be attached to a dashboard, instrument panel (instrument panel), etc., apart from an existing combination meter in which a speedometer, tachometer, thermometer, and fuel gauge are housed in a case body. Instrument is known. As this after meter, for example, a single analog display unit is housed in a case, and there is a meter or a light emitting display for displaying single vehicle information (for example, engine speed) of the vehicle. There are instruments that digitally display. Such an instrument is often mounted on a racing vehicle running on a circuit racetrack or the like, a supercharger, a turbo-equipped vehicle, or the like. These types of instruments include a tachometer that monitors the engine speed, an intake pressure gauge (boost meter) that monitors the boost pressure of the engine, an exhaust thermometer that monitors the exhaust gas exhaust temperature, and the engine oil temperature. There are oil temperature gauges, oil pressure gauges that monitor engine oil pressure, and fuel pressure gauges that monitor fuel pressure.

  Further, the applicant of the present application has proposed a meter driving device disclosed in Patent Document 1 as a driving device for an aftermeter that is assumed to be arranged in plural. The instrument driving device proposed in Patent Document 1 includes an input port that enables input of a plurality of state signals according to vehicle information, and a single control for obtaining each measurement value according to the plurality of state signals A unit is provided to communicate between the control unit and each instrument by serial data generated by the control unit, simplifying the installation work even when a plurality of instruments are provided, and Each instrument can be attached without deteriorating the beauty of the dashboard and the instrument panel.

Further, as disclosed in Patent Document 1, the so-called peak display function for storing the maximum value (peak value) of past measurement values and displaying the maximum value on the aftermeter by a predetermined operation as disclosed in Patent Document 1. Is provided. With such a function, the user can confirm whether or not the vehicle has been in a state requiring attention in the past traveling, and whether or not the vehicle has been able to travel while controlling the vehicle state within a predetermined range.
JP 2000-18974 A

  However, in the conventional peak display function, the maximum value of the measurement data of each vehicle information is stored and displayed. Of the vehicle information, the hydraulic pressure and the fuel pressure have a predetermined value that is larger than the case where the numerical value is larger than the predetermined value. It can be said that the case where it was smaller was a state requiring attention. Therefore, it is possible to improve the functionality of confirming the state of the past vehicle by storing the minimum value for such specific vehicle information and enabling it to be displayed later, but simply storing the minimum value. When the control is performed, for example, regarding the hydraulic pressure, when the engine is stopped with power supplied to the aftermeter, the measured value is 0 kPa, so the minimum value stored is always 0 kPa, and the fuel pressure In some tuning cars that can control the fuel pump independently, even if power is supplied to the aftermeter, the measured value becomes 0 kPa before the fuel pump is activated, and the state of the vehicle in the past driving is confirmed. There was a problem that it was insufficient as a function.

  In view of the above-mentioned problems, the present invention further improves the after-meter driving device having a peak display function for storing and displaying past vehicle information, and in the case of specific vehicle information such as hydraulic pressure and fuel pressure, the past driving is improved. It is an object of the present invention to provide an instrument driving device capable of storing and displaying a minimum value.

  In order to solve the above-mentioned problem, the present invention is provided with a control unit that inputs a state signal indicating vehicle information, calculates a measurement value based on the state signal, and causes a display unit to perform display operation based on the measurement value. And a minimum value display function for storing the minimum value of the measured value and causing the display unit to perform display operation based on the minimum value in accordance with a predetermined operation. It is determined whether or not the measured value is equal to or greater than a predetermined value. When it is determined that the measured value is equal to or greater than the predetermined value after power is turned on, the minimum value is updated. If it is determined that the value is not equal to or greater than the predetermined value, the minimum value is not updated.

  In order to solve the above-mentioned problem, the present invention is provided with a control unit that inputs a state signal indicating vehicle information, calculates a measurement value based on the state signal, and causes a display unit to perform display operation based on the measurement value. And a minimum value display function for storing the minimum value of the measured value and causing the display unit to perform display operation based on the minimum value in accordance with a predetermined operation. It is determined whether or not the measurement value is equal to or greater than a predetermined value. When it is determined that the measurement value is equal to or greater than the predetermined value after power is turned on, it is further determined that the measurement value is smaller than the previous measurement value. Then, the update of the minimum value is executed, and when it is determined that the measured value is not greater than or equal to the predetermined value after power is turned on, or when the measured value is determined to be greater than or equal to the previous measured value Update the minimum value Characterized in that it does not run.

  Further, the control means is a control unit provided separately from the instrument, and the control unit inputs a plurality of state signals indicating vehicle information, and calculates each measured value of the vehicle information based on each state signal. Each of the measured values is converted into serial data, and the serial data is transmitted to the instrument. The instrument receives the serial data and causes the display unit to perform a display operation according to the serial data. The serial data is transmitted to the instrument.

  Further, the control unit converts the minimum value into serial data in the minimum value display function and transmits the serial data to the instrument, and the instrument receives the serial data and displays the display unit according to the serial data. It is characterized by operating.

  Further, the vehicle information in which the minimum value is stored in the minimum value display function is at least one of hydraulic pressure and fuel pressure.

  In particular, the present invention relates to an instrument driving device provided separately from a vehicle combination meter. In particular vehicle information such as hydraulic pressure and fuel pressure, a minimum value during past driving can be stored and displayed. It is possible.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. The overall configuration of the instrument driving apparatus will be described with reference to FIGS. 1 and 2. As shown in FIG. 1, the instrument driving apparatus mainly includes a control unit (control unit) 1, a hydraulic gauge (instrument) 2, and a fuel pressure gauge (instrument) 3.

  The control unit 1 is composed of a microcomputer, and an A / D conversion unit that inputs each state signal indicating vehicle information, a CPU that executes a predetermined processing operation program, a ROM that stores the processing operation program and the like, A RAM that temporarily stores data processed by the CPU, a parallel / serial conversion unit (P / S conversion unit) that converts parallel data into serial data, an EEPROM that stores various settings in a nonvolatile manner, The storage unit includes a backup RAM and the like, and a transmission unit that transmits the serial data in a predetermined cycle. When the state signal indicating the vehicle information is input, the control unit 1 performs a predetermined calculation process according to each state signal and calculates each measurement value of the vehicle information. Further, in the normal operation mode, the control unit 1 converts the model code for identifying the model of the instrument and the parallel data as each measurement value into serial data, and the hydraulic meter 2 through the wiring members 4a and 4b. And it transmits to the control means mentioned later of fuel pressure gauge 3. The wiring member 4 a is a wiring member including a multiplex transmission communication line for transferring serial data from the control unit 1, one end connected to the control unit 1, and the other end connected to the control means of the oil pressure gauge 2. The wiring member 4b has the same configuration as the wiring member 4a, and one end is connected to the control means of the hydraulic pressure gauge 2 and the other end is connected to the control means of the fuel pressure gauge 3. Therefore, in the present embodiment, the serial data from the control unit 1 is transmitted in the order of the oil pressure gauge 2 → the fuel pressure gauge 3.

  Further, the instrument driving device stores minimum values of measured values of engine oil pressure (hereinafter referred to as oil pressure) and fuel pressure (hereinafter referred to as fuel pressure) in the vehicle information, and is provided in the control unit 1, for example. In response to a predetermined operation of an operation switch (not shown), the minimum value is converted into serial data and transmitted to the hydraulic pressure gauge 2 and the fuel pressure gauge 3, and the hydraulic pressure gauge 2 or the fuel pressure gauge 3 is displayed based on the minimum value. It has a minimum value display function (that is, displays the minimum value). The control unit 1 can also be connected to instruments other than the oil pressure gauge 2 and the fuel pressure gauge 3. For vehicle information other than the oil pressure and the fuel pressure, the control unit 1 stores the maximum value of the measured value and performs a predetermined operation of the operation switch. Accordingly, the maximum value is converted into serial data and transmitted to the corresponding instrument, and the instrument has a peak display function for performing display operation based on the maximum value (that is, displaying the maximum value).

  As shown in FIG. 2, the oil pressure gauge 2 is an analog type instrument in which a control means 2 a and an analog type display unit 2 b are housed in a case body, and displays oil pressure as vehicle information. is there.

  The control means 2a comprises a microcomputer, receives the serial data transmitted by the control unit 1, and causes the display unit 2b to perform a display operation based on the serial data. Further, the control means 2a transfers the serial data to the control means 3a of the fuel pressure gauge 3 via the wiring member 4b.

  As shown in FIG. 2, the fuel pressure gauge 3 is an analog meter in which a control means 3a and an analog display section 3b are housed in a case body, and displays fuel pressure as vehicle information. is there.

  The control means 3a is composed of a microcomputer, and receives the serial data transmitted from the control unit 1 via the control means 2a of the hydraulic gauge 2, and displays the display unit 3b based on the serial data.

  The above-described units constitute a meter driving device.

  Next, the minimum value update process in the minimum value display function provided in the control unit 1 will be described with reference to FIG.

  First, when the control unit 1 detects power-on, the control unit 1 determines whether or not a measured value calculated after power-on is equal to or greater than a predetermined value (step S1). The predetermined value is a value that can predict that the engine or the fuel pump has been started based on the numerical value (the hydraulic pressure is 0 kpa before the engine is started, but the value increases as the engine starts, and the fuel pressure is the fuel pressure. It is set to 0 kPa before starting the pump, but the value increases with starting the fuel pump). When it is determined in step S1 that the measured value is equal to or greater than the predetermined value, the control unit 1 proceeds to step S2. If it is determined in step S1 that the measured value is not equal to or greater than the predetermined value, the minimum value is not updated. By such processing, it is possible to prevent the minimum value from being updated by the measured value before starting the engine or before starting the fuel pump.

  In step S2, the control unit 1 further determines whether or not the current measurement value is smaller than the previous measurement value, that is, whether or not the change in the measurement value tends to decrease. If it is determined in step S2 that the current measurement value is smaller than the previous measurement value, the control unit 1 proceeds to step S3. If it is determined in step S2 that the current measurement value is greater than or equal to the previous measurement value, the minimum value is not updated. After the measurement value exceeds the predetermined value by such processing, the minimum value is prevented from being updated even though the measurement value has not changed or is rising but the vehicle is relatively stable. Can do.

  In step S3, the control unit 1 further determines whether or not the current measurement value is smaller than the minimum value currently stored. If it is determined in step S3 that the current measured value is smaller than the currently stored minimum value, the control unit 1 proceeds to step S4. If it is determined in step S3 that the current measurement value is greater than or equal to the currently stored minimum value, the minimum value is not updated. This is because the measured value this time does not become the minimum value during operation.

  In step S4, the control unit 1 stores the current measured value as a new minimum value, and updates the minimum value.

  The instrument driving apparatus according to the present embodiment stores the minimum value of the measurement value and displays the display values 2b and 3b of the instruments 2 and 3 based on the minimum value according to a predetermined operation. The control unit 1 determines whether or not the measured value is equal to or greater than a predetermined value after power is turned on, and updates the minimum value when it is determined that the measured value is equal to or greater than the predetermined value after power is turned on When it is determined that the measured value is not equal to or greater than the predetermined value after the power is turned on, a process that does not execute the update of the minimum value is performed.

  By executing such processing, the minimum value of the vehicle information in the past driving is stored with respect to the vehicle information in which the vehicle needs attention when the numerical values such as the hydraulic pressure and the fuel pressure are low. The user can confirm the value, and the function of confirming the past vehicle state can be improved.

  Further, even when the meter is equal to or greater than the predetermined value after power is turned on, if it is determined that the current measurement value is greater than or equal to the previous measurement value, the process of not performing the update of the minimum value is performed. By doing so, even if the predetermined value is set to a relatively low value, the minimum value is updated regardless of whether the measured value has not changed or has risen, but the vehicle is relatively stable. This can be prevented, and the function of confirming the past vehicle state can be further improved.

  In the present embodiment, the control unit 1 provided separately from the oil pressure gauge 2 and the fuel pressure gauge 3 is provided, and the oil pressure gauge 2 and the fuel pressure gauge 3 are linked. It is good also as a structure which controls each meter 2 and 3 independently by the control means 2a and 3a incorporated in the meters 2 and 3. FIG.

The block diagram which shows the structure of the drive device of the meter of embodiment of this invention. The block diagram which shows the structure of the instrument in the drive device of an instrument same as the above. The flowchart figure which shows the minimum value update process in the drive device of an instrument same as the above.

Explanation of symbols

1 Control unit (control unit)
2 Hydraulic gauge (instrument)
2a Control means 2b Display unit 3 Fuel pressure gauge (instrument)
3a Control means 3b Display unit

Claims (5)

An instrument driving device including a control unit that inputs a state signal indicating vehicle information, calculates a measurement value based on the state signal, and causes a display unit to perform display operation based on the measurement value,
A minimum value display function for storing the minimum value of the measured value and causing the display unit to perform display operation based on the minimum value in accordance with a predetermined operation is provided. If the measured value is determined to be equal to or greater than the predetermined value after power is turned on, the minimum value is updated, and the measured value is equal to or greater than the predetermined value after power is turned on. If it is determined that the minimum value is not reached, the update of the minimum value is not executed. An instrument driving device including a control unit that inputs a state signal indicating vehicle information, calculates a measurement value based on the state signal, and causes a display unit to perform display operation based on the measurement value,
A minimum value display function for storing the minimum value of the measured value and causing the display unit to perform display operation based on the minimum value in accordance with a predetermined operation is provided. If it is determined that the measured value is equal to or greater than the predetermined value after power is turned on, the minimum value is updated when it is further determined that the measured value is smaller than the previous measured value. If the measured value is determined not to be greater than or equal to the predetermined value after power is turned on, or if the measured value is determined to be greater than or equal to the previous measured value, the minimum value is updated. An instrument driving device characterized by not. The control means is a control unit provided separately from the instrument, and the control unit inputs a plurality of state signals indicating vehicle information, and obtains each measurement value of the vehicle information based on each state signal, Each measured value is converted into serial data, and the serial data is transmitted to the instrument,
The said meter receives the said serial data, displays the said display part according to the said serial data, and transmits the said serial data to another meter. Instrument drive. The control unit converts the minimum value into serial data in the minimum value display function and transmits it to the instrument,
4. The instrument driving apparatus according to claim 3, wherein the instrument receives the serial data and causes the display unit to perform a display operation according to the serial data. 3. The instrument driving apparatus according to claim 1, wherein the vehicle information in which the minimum value is stored in the minimum value display function is at least one of hydraulic pressure and fuel pressure.

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