JPS61198063A - Detecting device of car speed or the like of vehicle - Google Patents

Abstract

PURPOSE:To calculate a car speed, a slip rate, a running distance, etc. from a generated pulsative output by providing a rotary side detecting body for constituting one of detectors of an electromagnetic induction type, in the vicinity of the peripheral part of a wheel, and providing the other fixed side detecting body on a car body. CONSTITUTION:A rotary side detecting body Sa consisting of a magnetic piece, etc. for constituting one of detectors of an electromagnetic induction type is fixed by burying or sticking it into to the peripheral part of a tire 2 of each wheel 1 of a tractor, etc. Also, a fixed side detector Sb consisting of a magnetic proximity switch, etc. for constituting the other of the detectors is provided on a car body 4 side in the vicinity of the rotary side detecting body Sa. In this state, an impulsive signal from the fixed side detecting body Sb is received and calculated by a peripheral speed calculating circuit which mainly consists of a counter, and a car speed, a slit rate, a running distance, etc. are derived. Accordingly, the detection can be executed with high sensitivity, and also, even if the wheel 1 is replaced with that which has a different outside diameter, the necessary correction can be simplified.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a device for detecting vehicle speed, etc. of a vehicle such as a tractor, and detects and calculates the relative speed of a wheel to a main body near the outer periphery as a pulsed output. The system has been devised to accurately detect vehicle speed, slip rate, etc.

[Conventional technology]

Conventionally, the number of revolutions of the drive axle on the transmission mechanism side was detected by a sensor and the vehicle speed, slip rate, etc. were calculated based on this method, but since the vehicle speed also changes depending on the wheel diameter. However, each time a wheel is replaced, it is troublesome and requires complicated corrections.Moreover, since the circumferential rotational speed of the axle is much lower than that of the wheels, there is a drawback that the detection sensitivity tends to be insufficient.

[Problem that the invention seeks to solve]

In this invention, even if the wheel is replaced with a wheel having a different metal, outside, and diameter, only a very simple correction is required, and the invention has been devised so that detection can be performed with sufficiently high sensitivity.

[Means for solving problems]

In order to solve the above problems, the present invention has taken the following technical means.

That is,! A magnetic induction type detector [a rotating side detector (Sa) t- constituting 17ff of Sl, is provided on the wheel (11) near the circumference of the wheel (1), and constitutes the other of the above detectors (a). The fixed side detector (Sb) is provided on the vehicle body (4) and detects the vehicle speed, slip rate, It is structured to calculate mileage, etc., and is sophisticated.

[Effect]

Since the rotating side detector (sa>t-) is provided near the circumference of the wheel (1), the formula for calculating the circumferential speed of the wheel (1) is extremely simple, and it is easy to replace the wheel (1) with one with a different outer diameter. However, the ground speed can be calculated by performing an extremely simple correction, and since the circumferential speed of the rotating detection body (Sa) is large, the induced pulse-like output is also large,
Provides sufficient sensitivity.

〔Example〕

Next, one embodiment of the present invention will be described based on the drawings.

The gt diagram shows the main parts of a tractor as an example of a vehicle,
The side view is shown in the second picture, and the perspective view of the wheel (11) is shown in Fig. 3.
? As the rotating detection body (Sa) to be collected, for example, a magnetic piece is placed around the circumference of the tire (2) of the wheel (1) (in the illustrated example, the lug (
3)) by embedding or gluing it into the detector (
A magnetic proximity switch is attached to the vehicle body (4) close to the rotating surface of the rotating side detecting body (Sa) as a fixed side detecting body (Sb) which is the other side t-1#a of Sl. Each time the magnetic flux passes near the stationary detector (Sb), the magnetic flux changes and a pulse is output.

Regarding the front wheel (11), it is attached to the drag arm (5), which is a member that steers and turns together with the wheel (11), or to the turning side gear case, and regarding the rear wheel fil, the fourth
The figure shows a longitudinal cross-sectional rear view of the main part, and it is mounted on the outside of the fender (6).

Then, the circumferential speed calculation circuit ()), which mainly consists of a counter, is
The left and right wheels (11) are provided corresponding to the front and rear left and right wheels, respectively, and the pulses generated by the respective detectors (3) are calculated as circumferential speed per unit time by a circumferential speed calculation circuit (7). ,
This circumferential speed is input to the vehicle speed calculation circuit (8).

The vehicle speed etc. calculation circuit (8) has the function of calculating the vehicle speed, slip ratio 2 travel distance, etc. An example of the calculation logic is shown in Table 1, but depending on the nature of the soil,
This method may be changed and is not limited to this method.

Then, whether or not to operate the differential lock is determined by switching the differential lock switch (9), and in case of 4-wheel drive, by switching the 4-wheel drive switch α1, the vehicle speed etc. calculation circuit (8) is determined. are inputting each.

The vehicle speed calculation circuit (8) also calculates the mileage based on the vehicle speed, and displays the vehicle speed on the vehicle speed display section αB and the slip rate on the slip rate display α2. The mileage display section (13, respectively) is
displayed to notify the driver.

In the illustrated example, the plowing is configured using something like a potentiometer so that draft control can also be performed to control the load so that the slip ratio is within a certain value. Input the appropriate slip rate setting value when tilling work is performed efficiently using the tilling load setting device (Il) into the full load control circuit a4, and calculate the n'ft slip rate by the vehicle speed calculation circuit (8). It is controlled by the lift control valve tm2 of the hydraulic lifting mechanism of the tractor (l!9) and the amplification drive circuit a″h so that the detected value substantially matches the slip ratio setting value, When the slip rate detection value is smaller than the slip rate setting value, drain the pressure oil in the lift cylinder (15) and remove the lift arm and perform ground work @Q9f.
If the detected slip ratio value is greater than the set slip ratio, pressurized oil is supplied to the lift cylinder αS and the lift arm α♂ and ground work equipment αg are raised to increase the load. This is to control the temperature to a small level.

Of course, the above calculation, display, and control are applied when driving in a straight line during work, and in order to avoid application while driving in a non-straight line, a changeover switch that is activated by turning the steering handle shaft is used. It may also be configured such that the display and other operations described above are cut off by the operation of this changeover switch.

In the illustrated example, there are a large number of rotating side detection bodies (Sa)'t on the wheel (1).

Since the number of pulses per time induced in the detector (St) is large, it is possible to detect variations in vehicle speed and x IJ lug rate with great sensitivity; For vehicles that do not need it, it is preferable to have one piece for each wheel (1) on the rotating side detection body (Sa), and the placement position fill may be a recess between the lugs (31) (31). However, the arrangement intervals are not limited to the equal intervals shown in the illustrated example.

Furthermore, although one illustration is omitted as the rotating side detection body (SR), a tooth-shaped protrusion formed near the outer circumference of the disk of the wheel may be used.

The magnetic material may be fixed to the disk, but as shown in the illustrated example, the rotating side detection body (Sa) in which the magnetic material is embedded or fixed in the entire tire is extremely inexpensive.0 [Effects of the Invention] The device for detecting vehicle speed, etc. of a vehicle according to the present invention is as described above.
lifttt, and there is a rotation side detection body (Sa) near the periphery of the wheel (1). This wheel (II
The formula for calculating the circumferential speed is extremely simple.

As a result, even if the wheel (1) is replaced with one with a different outer diameter, only a simple correction is required for this wheel, and the device can be simplified.
Wheels (1) This invention also solves the complexity of correction in the conventional system, which detects the rotation speed of the wheel drive shaft in the transmission case or axle housing, which is quite a transmission case. .

[Brief explanation of drawings]

Figure 1 shows an embodiment of the present invention. Longitudinal rear view, w, Figure 5 is detected! FIG. 2 is a block diagram of fili. Code explanation

Claims (1)

[Claims] The rotating detection body that constitutes one side of the electromagnetic induction type detector is
A fixed detection body, which is provided on the wheel near the periphery of the wheel and constitutes the other of the above-mentioned detectors, is provided on the vehicle body, and based on the pulse-like output generated by the detector on each axle, the vehicle speed of the vehicle, A device for detecting vehicle speed, etc. of a vehicle, characterized in that it is configured to calculate slip ratio, travel distance, etc.