WO2001094891A1

WO2001094891A1 - Meter driving method

Info

Publication number: WO2001094891A1
Application number: PCT/JP2001/004468
Authority: WO
Inventors: Takao Itou; Norio Seki
Original assignee: Nippon Seiki Co., Ltd
Priority date: 2000-06-09
Filing date: 2001-05-28
Publication date: 2001-12-13
Also published as: JP2001349751A

Abstract

An indication part is divided into a first indication area in which the measured value is a predetermined value or less or is smaller than the predetermined value, and a second indication area in which the measured value is the predetermined value or more or is greater than the predetermined value. The indication part is so operated that the indication response speed f the first indication area is slower than the indication response speed of the second indication area.

Description

Instrument driving method

The present invention relates to a method for driving an instrument having excellent display response speed, such as a tachometer or an intake pressure gauge, which is an instrument for a vehicle. Background art

Vehicle instruments include a tachometer that indicates the engine speed and an intake pressure gauge that indicates the intake pressure of the engine with a supercharger.The display section of these instruments has a pointer shaft on a dial plate that serves as a display board. It also displays the running state of the vehicle with good responsiveness by means of a pointer that rotates with it. These vehicle instruments are composed of, for example, cross-coil instruments and stepping motor instruments.

Such a vehicle instrument inputs a traveling state signal such as an engine speed and an intake pressure according to the traveling state of the vehicle and drives the instrument based on a control signal corresponding to the traveling state signal. is there.

The display unit in the above-described vehicle instrument needs to operate the pointer with good responsiveness according to the running state of the vehicle.However, due to good responsiveness, for example, when the engine of the vehicle is idling, Despite the stop of the vehicle, the pointer operates following the variation in the engine speed, giving the driver an uncomfortable feeling as if the engine were very unstable. Had. SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide a method of driving an instrument which does not impair responsiveness of a display unit and does not give a driver an uncomfortable feeling. Disclosure of the invention

The present invention further includes a display unit that displays a measurement amount of the measurement target, divides a display area of the display unit into at least two display areas, and changes the display response speed in each of the areas to display the display unit. This is the method of driving the instrument to be operated. It is possible to obtain an instrument driving method that does not impair the responsiveness of the part and does not give a feeling of strangeness to the driver.

A display unit for displaying a measurement amount of the measurement target; and a display area on the display unit, wherein the measurement amount is a first display area for displaying a value equal to or less than a predetermined value or smaller than the predetermined value. A second display area in which the measured amount is equal to or larger than the predetermined value or larger than the predetermined value, and a display response speed in the first display area is equal to the second display area. This is a method of driving an instrument that operates the display unit so as to be slower than the display response speed in the area.For example, in an analog display unit that displays the engine speed with a pointer, A low rotation speed region of less than 100 rpm is defined as the first display region, and a display response speed in the first display region is 100 rpm or more. response By the operating the display section to be lower than the degree, it is possible to prevent the deflection of the pointer. ,

Further, a plurality of sub-regions are provided by setting a plurality of thresholds in the first display region. Further, it is possible to prevent the finger t) "from swinging in the low rotation speed region. Monkey

Further, in the subdivision area of the first display area closest to a switching point between the first display area and the second display area, the subdivision area approximates the display response speed of the second display area or The display unit is operated at the same display response speed, and the operation of the hands without discomfort can be obtained at the switching point of each display area. BRIEF DESCRIPTION OF THE FIGURES

FIG. 1 is a block diagram showing a circuit configuration of the present embodiment, FIG. 2 is a plan view of a speedometer of the present embodiment, FIG. 3 is a diagram showing a method of driving a display unit of the present embodiment, and FIG. FIG. 6 is a diagram showing a response speed in a display unit of the embodiment. BEST MODE FOR CARRYING OUT THE INVENTION

FIG. 1 is a diagram showing a driving device for a tachometer, which is a vehicle instrument. It mainly comprises a waveform shaping circuit 1, a control unit 2, a display unit 3, and a drive processing unit 4 for driving the display unit 3.

The waveform shaping circuit 1 inputs a TA pulse corresponding to the number of cylinders of a vehicle engine, and converts the TA pulse into a signal (0 to 5 V signal) to be input to a control unit 3 described later in detail.

The control unit 2 includes a so-called microcomputer, and measures a gate time of a pulse signal output from the waveform shaping circuit 1 according to the TA pulse, calculates a rotation speed, and executes a processing program described later. CPU 2a, ROM 2b storing a processing program described later, response speed variable n described below, and the like, RAM 2c temporarily storing calculation results, processing results, and the like, and inputting the pulse signal And an interface 2d for outputting command angle data corresponding to the engine speed according to the running state of the vehicle to a drive processing unit 5 described in detail later.The above-mentioned units are connected by a bus 2e. Have been.

The display unit 3 is a cross-coil body 3 in which a movable magnet 3a is mounted in a pobin formed by combining frames, and cross coils X (SIN side) and y (COS side) are wound around the outer surface of the frame. It has b. 'A dial 3c as shown in Fig. 2 is provided above the cross coil body 3b, and an indicator 3d for displaying the number of revolutions of the vehicle engine is printed and formed on the dial 3c. The indicator 3d is inserted into a pointer shaft (not shown) mounted on the movable magnet 3a to indicate the engine speed by the pointer 3e held.

The drive processing unit 4 includes ROM units 4 a and 4 b which store data indicating the amount of energization of the cross coils X and y corresponding to the indicated angle data corresponding to the engine speed determined by the control unit 2; D / A converters 4 c and 4 d for converting the output values of the ROM units 4 a and 4 b into respective analog quantities, and applying a drive voltage corresponding to the analog quantities to the cross coils x and y. It comprises drive output sections 4 e and 4 f, and the command angle data corresponding to the engine speed is output to the display section 3 via the drive processing section 4. .

Next, a method of driving the display unit 3 will be described with reference to FIGS.

The control unit 2 checks the presence or absence of the input of the identification switch 5 provided in the vehicle. When the identification switch 5 is turned on (step SI), the TA pulse corresponding to the running state of the vehicle is input as a pulse signal (hereinafter, referred to as an input signal) converted by the waveform shaping circuit 1. (Step S2).

Next, the control unit 2 measures the gate time of the input signal at a predetermined cycle, and obtains the engine speed i by performing a predetermined calculation process based on the measurement result (step S3).

Next, the controller 2 determines which of the thresholds a to d shown in FIG. 4 corresponds to the calculated engine speed i (steps S4 to S7).

Here, the processing method of the control unit 2 in steps S4 to S7 will be described in detail!

As shown in FIG. 4, the control unit 2 controls the vehicle engine speed in a first region where the rotational speed of the vehicle engine is less than 1000 rpm. (First display region) X and a second region where the rotational speed of the vehicle engine is 1000 rpm or more (second display region). (Area) Y and thresholds a to d are set in order to divide the first area X 'into a plurality of subdivided detail areas. The control unit 2 sets, for example, the threshold a to 250 rpm, the threshold b to 500 rpm, the threshold c to 750 rpm, and the threshold d to 100 pins, and the first area X and the second area Y. Are divided by the threshold d of 1000 rpm.

Therefore, the control unit 2 compares the rotation speed i obtained in step S3 with the threshold values a to d in steps S4 to S7. That is, it is determined whether or not the rotation speed i is greater than the threshold value a. If the rotation speed i is greater than the threshold value a, the process proceeds to the next step (step S5), and the rotation speed i is compared with the threshold value b (a≤ i <b). In this determination process, the determination process from the threshold value a to the threshold value d is sequentially performed according to the magnitude of the rotation speed i. The control unit 2 determines the rotation speed i in any one of steps S4 to S7. Is determined to be smaller than each of the threshold values a to d, the operation speed of the pointer 3 e on the display unit 3, that is, the response speed of the pointer 3 e (display response speed) is determined in steps S 8 to S 11. The response speed variable n in the calculation formula described later is determined. The control unit 2 also sets the response speed variable n when the rotation speed i is equal to or larger than the threshold value d in step S7 (step S12). Next, the control unit 2 calculates the pointer indicating value F on the display unit 3 based on the response speed variable n set in any one of steps S8 to S12 (step S12). 13), the pointer indication value F is output as indication angle data to the display unit 3 via the drive processing unit 4 (step S14).

Here, the response speed of guideline 3e will be described. For example, assuming that the indicated value F of the pointer 3e is determined by the following equation, the current value A, which is the engine speed currently determined, is replaced by the current value A and the engine speed calculated this time. Add the value obtained by dividing the amount of change from the target value B (rotational speed i) by the response speed variable n consisting of a natural number. (If the target value B is larger than the current value A, Is obtained by calculating the pointer indicated value F by pointer 3e, and the larger the value obtained by dividing the amount of change by the response speed variable n, the larger the value added to the current value A Therefore, the amount of change in the operation of pointer 3e also increases, and the response speed of pointer 3e increases. In addition, the smaller the value obtained by dividing the amount of change by the response speed variable n, the smaller the value added to the current value A. It is.

Pointer indication value F = current value A + ((current value A-target value B) / response speed variable n) Therefore, the response speed variable n displays the rotation speed i of a small value less than 100 rpm rpm. Is expressed in four steps in the range from 0 rpm to 100 rpm, and the variable n of these four steps gradually increases from the low rotation speed region to the high rotation speed region. By setting it to be smaller, the response speed of the pointer 3e gradually increases from the low rotation speed region to the high rotation speed region.

Also, the response speed variable n becomes the highest value from 100 O rpm when the rotation speed i having a large value of 100 rpm or more is displayed on the display unit 3 (second area Y) (in FIG. 2, By setting up to 9 ◦ 0 rpm) with a variable n smaller than the detail area in the first area X closest to the threshold value d, the indication by the pointer 3 e of the display unit 3 with a fast response speed can be obtained. . The response speed variable n in the second region Y is set to the same response speed variable n when good response is obtained by the response speed variable n in the detail region in the first region X closest to the threshold value d. May be performed.

For example, if the rotation speed i is smaller than the threshold a (i <a), the response speed variable is set to "1 0, and 'If the rotation speed i is smaller than the b value (a≤i <b), the response speed variable is set to "8" .If the rotation speed i is smaller than the threshold c (b≤i <c), If the response speed variable is set to “5” and the rotation speed i is smaller than the threshold d (c≤i <d), the response speed variable is set to “3” and the rotation speed i is larger than the threshold d (i > d) is set in steps S4 to S7 so that the response speed variable becomes “2”. The driving method of the tachometer divides the display area of the display unit 3 into a first area X of less than 1000 rpm and a second area Y of more than 100 rpm, and the first area X This is to make the response speed variable n of the guideline 3 e different from that of the second area Y. That is, by making the response speed variable n in the first region X larger than the response speed variable n in the second region Y, the response speed of the pointer 3 e in the first region X is increased by the response speed of the pointer 3 e in the second region Y. The speed can be made lower than the speed, and the hand 3e can be prevented from swinging in a low rotation speed region of less than 100 rpm, which is an unstable region of the engine rotation speed. Thus, the driver of the vehicle does not fall into the illusion of an unstable engine.

In addition, by dividing the engine into a first region X where the engine speed is 100 rpm or less and a second region Y where the engine speed is 100 rpm or more, the second region Υ has the same response speed as before. The operation of the display unit with high speed can be obtained, and the responsiveness of the display unit 3 is not impaired.

Further, by setting the thresholds a to d in the first region X, the first region X is divided into a plurality of sub-regions, and the response speed variable n is set in detail in each of the sub-regions, thereby further reducing the rotational speed. The deflection of the pointer 3e in the area can be prevented.

Moreover, it is closest to the threshold value d, which is the switching point between the first area X and the second area Y! By setting the response speed variable η equal or similar to the response speed variable n of the second region X in the sub-region, The operation of 3 e will be obtained.

In the embodiment of the present invention, a tachometer has been described as an example of an instrument. However, the present invention may be applied to an intake pressure gauge in a vehicle with a supercharger. This is a particularly effective driving method for a high-speed instrument.

Further, in the embodiment of the present invention, an indicator portion formed on dial 3 c as a display portion is provided. Although the description has been made using the pointer-type meter indicating 3d with the pointer 3e, the present invention is similar to the above-described embodiment even with a meter using a digital display type or a bar graph display type as a display unit. It is possible to obtain various effects.

Further, in the embodiment of the present invention, a plurality of sub-regions are provided in the first region X. However, when a display unit of a digital display type or a bar graph display type is used, the responsiveness of the display operation is improved. Change may not appear more firmly than the pointer-type display unit, and therefore, may be divided into only the first region X and the second region Y, and the present invention is not necessarily limited to the subdivision in the first region. It is not necessary to provide an area. .

Further, in the embodiment of the present invention, the second region Y is set by one response speed variable n. However, in the second region Y, a plurality of response speeds are set similarly to the first region X. The speed variable n may be set to provide a detail area. INDUSTRIAL APPLICABILITY 'As described above, the instrument driving method according to the present invention is a particularly effective driving method for an instrument that requires a fast display response speed with respect to a change in an object to be measured.

Claims

The scope of the claims

1. A method for driving an instrument including a display unit for displaying a measurement amount of a measured object, wherein a display area in the display unit is divided into at least two display areas and display response speeds in the respective areas are different. And driving the display section.

2. A method for driving an instrument including a display unit for displaying a measured amount of a measured object, wherein a display area in the display unit is set to a value in which the measured amount is equal to or less than a predetermined value or smaller than the predetermined value. A first display area to be displayed, and a second display area in which the measured amount is equal to or greater than the predetermined value or larger than the predetermined value, and a display response speed in the first display area is divided. Operating the display unit so as to be slower than a display response speed in the second display area.

. 3 the first Do to provide a plurality of subdivided regions by setting a plurality of thresholds in the display region especially the ^Rukoto:. I sock and instrument driving method according to claim 2.

4. Nearest to the switching point between the first display area and the second display area, in the subdivision area of the first display area, approximating the display response speed of the second display area or 4. The method according to claim 3, wherein the display unit is operated at the same display response speed.

5. The instrument according to any one of claims 1 to 4, wherein the display unit is configured by any of a pointer display type, a digital display type, and a bar graph display type. Drive method.