JPS63171315A - Displaying device for mileage of vehicle - Google Patents

Abstract

PURPOSE:To enable the accurate display of the total mileage containing the forward-backward running of a vehicle with the distortion of tires taken into account, by controlling the display of mileage in accordance with the result of calculation of the mileage on the basis of the diameter of the tires and the number of rotations of running wheels. CONSTITUTION:A CPU 8 executes initialization first, and the makes conversion of the diameter of tires in running on the basis of a detection signal from a pressure sensor 1. Accordingly, said diameter of the tires is the one distorted by the weight of a load when a vehicle makes load running wherein it is loaded. Then, the diameter of tires is multiplied by the result of conversion of the number of rotations of tires on the basis of teeth number detection signals from an electromagnetic pickup 3, so as to calculate mileage at a given time. This mileage is subjected to integrating operation with the previous summed up mileage data stored in an operation memory, so as to renew the latter. The new data thus obtained are displayed 11 through an interface 9 and printed by a printer 12. In this way, this apparatus executes calculation and integration of mileage at a given time in the case when a ring gear 4 makes either forward or reverse rotation, and thus accurate mileage is displayed 11.

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a meter for a vehicle, and more particularly to a mileage display device for a vehicle.

(Prior Art) Conventionally, the mileage meter of a vehicle often accumulates only when driving forward, but not when driving backwards.
The mileage meter was not accurate. In other words, conventional mileage meters have a mechanism that adds up when the vehicle rotates in the forward direction, and when the vehicle rotates in the reverse direction (reverse travel), the meter moves back and records the distance.゛Such a mechanism is not so inconvenient for passenger cars, trucks, etc., but especially for industrial vehicles, there is a lot of traveling in reverse, and in cases where the number of backward trips is more than the forward one, the mileage meter may be There is also the problem that zero is always displayed, and there is a drawback that it does not function as a meter.

To solve this problem, reverse rotation (backward driving)
A mileage meter has also been proposed that is equipped with a conversion mechanism that mechanically converts the rotation into the forward rotation direction.

(Problems to be Solved by the Invention) However, the odometer that has been proposed as described above has a complicated structure, and especially in the case of industrial vehicles, which often travel during cargo handling operations, Since no measures have been taken to correct the distortion of the tire diameter, there was a problem in that the actual distance traveled both forward and backward could not be displayed accurately.

The present invention has been made to solve the above-mentioned problems, and its object is to provide a vehicle mileage display device that can accurately display the mileage.

Structure of the Invention (Means for Solving Problems) The present invention comprises tire diameter detection means for detecting the tire diameter during running, rotation speed detection means for detecting the rotation speed of the running wheels, and a rotation speed detection means for detecting the rotation speed of the running wheels. The gist thereof is to include a calculation means for calculating the distance traveled based on a detection signal, and a display control means for controlling the display to display the distance traveled based on the calculation result of the calculation means. .

(Function) The tire diameter detection means detects the tire diameter during running, and the rotation speed detection means detects the rotation speed of the running wheels. The calculation means calculates the mileage based on the detection signals from both the detection means, and the display control means performs mileage display control based on the calculation results of the calculation means.

(Example) Hereinafter, a first example in which the present invention is embodied in a forklift will be described with reference to FIGS. 1 and 2.

First, the electrical configuration of this mileage display device will be described. A pressure sensor 1 serving as tire diameter detection means is provided in a lift cylinder 2.

The pressure sensor 1 detects the oil pressure in the lift cylinder 2 by utilizing the fact that the oil pressure in the lift cylinder 2 is proportional to the load of the load applied to the lift, and outputs a pressure detection signal to the controller 5 described later. Further, an N magnetic pickup 3 as a rotation speed detection means is arranged correspondingly to a ring gear 4 provided in a differential gear mechanism that transmits driving force from a drive source to drive wheels as running wheels of the forklift. . The electromagnetic pickup 3 detects the number of teeth of a ring gear 4 that rotates forward or backward, and outputs a tooth number detection signal to a controller 5, which will be described later.

The controller 5 includes an amplifier 6 that amplifies the oil pressure detection signal to an appropriate magnitude, and an A/D converter 7 that converts the amplified oil pressure detection signal from an analog value to a digital value.
A central processing unit (hereinafter referred to as CPU) 8 as arithmetic means and display control means, an interface 9 and a clock integrated circuit (hereinafter referred to as clock LSI) 10.
It is composed of. The CPU 8 stores various control programs such as an arithmetic control program, a display control program, and a printer control program in a program memory (ROM (not shown)), and performs arithmetic processing based on these control programs, and also displays the display 11,
and controls and drives output devices such as the printer 12. Also, C
The PU 8 includes a working memory (RAM) not shown, and stores the results of the arithmetic processing from time to time, and also stores the accumulated mileage data in a total mileage storage area. The travel distance data stored in the total travel distance storage area of the working memory is retained even if the power is turned off when the forklift stops traveling by a backup power source such as a battery (not shown).

A display 11, which is one of the output devices, is provided on the instrument panel of the driver's seat of the forklift, and is capable of displaying speed using a multi-digit display, each digit consisting of a 7-segment LED. Further, the printer 12 is installed in the driver's seat of the forklift.

Next, the operation of the mileage display device configured as described above will be explained with reference to FIG.

When the power is turned on and driving starts, the CPU 28 initializes the registers in the working memory other than the storage area storing mileage data and various flags in step 1 (step is hereinafter referred to as S). do. Next, in S2, the CPUA inputs the pressure detection signal from the pressure sensor 1, and in S3, converts the diameter of the tire during running based on this detection signal. Therefore, if the vehicle is traveling with a cargo loaded, the tire diameter converted at this time will be the diameter of the tire distorted by the load of the cargo.

Next, in S4, the tooth number detection signal of the tooth number detection signal from the electromagnetic pickup 3 is read. Then, in S5, the tire rotation speed is converted based on the signal, and the tire diameter is multiplied based on the converted result to calculate the current mileage (S6). Then, the data in the total mileage storage area is rewritten by integrating the mileage calculated from time to time with the previous total mileage data stored in the total mileage storage area in the working memory (S7).

Next, in S8, the CPLJ 8 reads out the mileage data newly stored in the total mileage storage area and outputs it to the display 11 via the interface 9 to display the mileage. Also, at this time, the mileage data is printed on the printer 12.

After this, the control program returns to S2.

In this way, this mileage display device calculates the mileage at each time even when the ring gear 4 is rotating forward (forward travel) or reverse (reverse travel), and calculates the total mileage! ? 4
Since the calculated distance is calculated and displayed on the display 11, accurate mileage can be displayed.

Next, a second embodiment will be described with reference to FIG.

In this embodiment, the program memory included in the CPU 8 stores a data table of the traveling speed at which the forklift is traveling and the effective tire diameter. The data table is obtained by previously measuring the relationship between the traveling speed of a forklift and the effective tire diameter at that traveling speed. In this embodiment, after S5 in the flowchart of the first embodiment, the running speed is calculated based on the number of rotations of the tie 17 converted in step 85 (551), and the tire is adjusted according to the running speed determined in the next step 852. The effective tire diameter is determined from the data table stored in the program memory, the tire diameter determined in step S3 is corrected based on the determined tire effective diameter, and the mileage is calculated in step 86 using the corrected tire diameter. It's different.

Therefore, in this embodiment, the detected tire diameter is corrected by the tire effective diameter according to the traveling speed, so that a more accurate total traveling distance can be displayed.

Note that the present invention is not limited to the above-mentioned embodiments, and the display may be changed to a CRT or the like, or an ultrasonic sensor or optical sensor may be installed under the lift frame instead of a pressure sensor as a means for detecting tire distortion. It is also possible to make arbitrary changes without departing from the spirit of the present invention, such as using these sensors to detect tire distortion due to the load of cargo by measuring the distance from the ground.

(Effects of the Invention) As detailed above, the present invention takes into account tire distortion and can accurately display the total distance traveled, including the forward and backward travel of the vehicle. We can accurately perform safety management and maintenance of fuel oil,
It has an excellent effect in that the consumption status of lubricating oil etc. can be grasped more accurately.

[Brief explanation of the drawing]

FIG. 1 is an electrical block diagram of a first embodiment embodying the present invention, FIG. 2 is a flowchart, and FIG. 3 is a flowchart of the second embodiment. 1° is a pressure sensor as a tire diameter detection means, 2 is a lift cylinder, 3 is an electromagnetic pickup as a rotation speed detection means, 5 is a controller, and 8 is a central processing unit (CPU) as a calculation means and display control means. , 11 is a display for display. Patent applicant Toyota Industries Corporation Representative Patent attorney On 1) Hironobu Drawing No. 2 No later drawings

Claims (1)

[Scope of Claims] 1. Tire diameter detection means for detecting the tire diameter during running; rotation speed detection means for detecting the rotation speed of the running wheels; and a distance traveled based on detection signals from both of the detection means. A mileage display device for a vehicle, comprising: arithmetic means for performing arithmetic processing; and a display control means for controlling a display to display a mileage based on the arithmetic processing result of the arithmetic means. 2. The calculation means determines the tire effective diameter according to the rotational speed of the running wheels at that time, and performs the calculation by correcting the tire diameter based on the detection by the tire diameter detection means. The vehicle mileage display device described in .