JPH02167007A - Speed controller of working car - Google Patents

Abstract

PURPOSE:To prevent engine stop by operating an auxiliary speed-controller in a nonworking state and reducing the engine load in case of sudden loading on the engine. CONSTITUTION:In detection of a nonworking state by a working-state detector (S0), an auxiliary speed-controller 101 is operated and in case of [a rotational frequency detected by a rotational frequency detector (S1)]<=(the standard rotational frequency for the nonworking state), a speed change gear 9 is automatically operated to reduce the car speed for reduction of the load of the engine (E).

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention provides an engine in which a transmission for traveling and a working device are interlocked and connected, and a rotation speed detection means for detecting the rotation speed of the engine as described in 10; When the detected rotational speed of the rotational speed detecting means is larger than the reference rotational speed for work, the speed is increased, and when the detected rotational speed is smaller than the reference rotational speed for work, the speed is reduced. The vehicle speed control means automatically operates the transmission based on the information detected by the rotation speed detection means, and the work state detection means detects whether the work vehicle is in a work state. The present invention relates to a vehicle speed control device for a working vehicle, wherein the vehicle speed control means is configured to perform a control operation only when the work state detection means detects that the work state is in the work state.

[Conventional technology]

An example of a vehicle speed control device for a work vehicle as described above is a vehicle speed control device for a combine harvester.

In a combine harvester, the amount of husk supplied to the threshing device as a working device increases or decreases in accordance with an increase or decrease in the reaping speed, that is, the vehicle speed, and the threshing load increases or decreases in accordance with the increase or decrease in the amount of husk supplied. Furthermore, the engine speed changes depending on the increase or decrease in the threshing load. Therefore, by taking advantage of the fact that the load on the threshing device increases or decreases as the vehicle speed increases or decreases, the vehicle speed is automatically adjusted so that the engine rotation speed approaches the reference rotation speed.

In other words, when the threshing load decreases and the engine speed becomes higher than the reference speed, the speed is increased, and when the threshing load increases and the engine speed becomes smaller than the reference speed, the speed is reduced. Ta.

Such vehicle speed control is performed only when the work vehicle is in a working state (in the case of a combine harvester, it is in a reaping working state).

[Problem to be solved by the invention]

In the above conventional technology, for example, when the combine reaches a headland and enters a non-reaping work state (non-work state), the threshing load does not increase, but a large load is suddenly applied to the engine as it turns. As a result, there was a risk that the engine would stall.

An object of the present invention is to eliminate the above-mentioned conventional drawbacks.

[Means to solve the problem]

In order to achieve this object, a first characteristic configuration of the vehicle speed control device for a work vehicle according to the present invention is such that when the rotation speed detected by the rotation speed detection means is smaller than the reference rotation speed for non-work use, the speed is reduced. Further, an auxiliary vehicle speed control means configured to automatically operate the transmission based on the detection information of the rotation speed detection means is provided, and the work state detection means detects that the work state detection means is in the non-work state. The auxiliary control means control is configured to operate only at certain times.

A second characteristic configuration is that the auxiliary vehicle speed control means operates based on the detection information of the rotation speed detection means to increase the speed when the detected rotation speed is larger than the reference rotation speed for non-working use. The auxiliary vehicle speed control means is configured to automatically operate the transmission, and further, the auxiliary vehicle speed control means changes the speed by a larger amount as the deviation between the non-working reference rotation speed and the detected rotation speed increases; The gear shift operation is performed in a state in which the amount of speed change on the deceleration side per unit amount of force of the deviation is larger than the amount of speed change on the speed increase side.

[For production]

In the vehicle speed control device for a working vehicle according to the first characteristic configuration, the auxiliary vehicle speed control means is activated when the working vehicle enters a non-working state.

In other words, when a sudden load is applied, the engine is decelerated to reduce the engine load.

In the vehicle speed control device for a working vehicle according to the second characteristic configuration, when the working vehicle is in a non-working state, the speed change is increased/decreased so that the larger the deviation between the engine rotation speed and the non-working reference rotation speed, the larger the shift amount. Manipulate. Since the amount of deceleration is greater than the amount of acceleration, it is possible to run at high speed and improve work efficiency while reliably avoiding engine overload.

However, since the amount of speed increase is small, the danger of sudden speed increase is avoided.

〔Effect of the invention〕

In the vehicle speed control device for a working vehicle according to the first characteristic configuration, when a sudden load is applied to the engine even in a non-working state, the engine load is reduced, thereby preventing the engine from stalling.

In addition to the advantages of the first characteristic configuration, the vehicle speed control device for a work vehicle according to the second characteristic configuration increases the speed while increasing safety by preventing sudden acceleration, thereby improving work efficiency. This will be advantageous for achieving this goal.

[Example] Hereinafter, an example in which the present invention is applied to a vehicle speed control device for a combine harvester will be described based on the drawings.

As shown in Fig. 3, the combine harvester includes a machine body (ν), a crawler traveling device (1), and a threshing device (1) as a working device.
2), a reaping section (3) and a control section (4) are provided at the front of the fuselage (V).

The reaping unit (3) includes a triggering device (5) that causes the grain culm in the field, a cutting blade (6) that cuts the base of the raised grain culm, and a rear part of the machine while changing the posture of the harvested grain culm to a sideways posture. Each of the conveying devices (7) is provided for transporting the threshing feed one chain toward the side threshing feed chain (8). In addition, the said reaping part (3) is provided in the said machine body m so that it can be raised and lowered freely.

Then, at a location on the transport start end side of the transport device (7), a stock sensor (
S0) is provided.

To explain further, when the reaping operation starts, the culm whose stock has been cut off by the cutting blade (6) is detected by the stock sensor (
S0), the stock sensor (S0) is turned on, and as the reaping work is completed, the culm supply is stopped and the stock sensor (S0) is turned off. become. In other words, this stock sensor (S0) corresponds to the work state detection means.

As shown in FIG. 1, the engine (C) and the crawler traveling device (1) are connected in motion via a hydraulic continuously variable transmission (9) and a pair of left and right steering clutches and brakes (1G). At the same time, the engine (IE) and the thresher (10) of the threshing device (2) are interlocked via a heald tension type threshing clutch (11).

A rotation speed sensor (S1) is provided as rotation speed detection means for detecting the rotation speed of the engine (E).

The transmission (9) is operatively connected to a manually operated transmission lever (13) via a link mechanism (12). A speed change motor (14) serving as a speed change actuator is operatively connected to the link mechanism (12) via a friction type transmission mechanism (15). In other words, while allowing the manual speed change operation using the speed change lever (13), t? Automatic speed change operation is also possible using the iJ speed change motor (14).

The pair of steering clutch brakes (16) can each be switched into four stages by a control valve (17). That is, there are four stages: "forward rotation", "clutch disengagement", "clutch disengagement and control", and "reverse rotation".

The control valve (17) is connected to an operating lever (18) and can be manually operated. still,
This operating lever (18) is also connected to a control valve (19) for raising and lowering the reaping section (3).

Although not described in detail, the operating lever (18) is constructed in a cross-swing type and is biased to return to the neutral position (N). It can move left and right in 13 steps in 3 steps. For example, if the vehicle is moved one step to the right, the power to the right traveling device (1) is cut off. When the gear is moved one nil to the second stage, further braking force is applied to the right traveling gear W(1). and 3
In the stage, reverse power is applied to the right traveling device (1). If it is swung to the left, the same effect will be applied to the left traveling device (1). Further, when the control lever (18) is swung rearward, the reaper (3) is raised, and when the control lever (18) is swung forward, the reaper (3) is lowered. It is configured to operate a lifting cylinder (20).

Further, a threshing clutch lever (16) is provided for manually turning on and off the threshing clutch (11), and a threshing switch (S2) is provided which is turned ON when the threshing clutch lever (11) is turned on and off.

Then, the stock sensor (S0), the rotation speed sensor (
A control device (11) using a microcomputer is provided to operate the speed change motor (14) and automatically adjust the vehicle speed based on the detection information of the threshing switch (S1) and the threshing switch (S2). There is.

In other words, the control device (II) is used to configure the vehicle speed control means (100) and the auxiliary vehicle control means (101).

In the working state, the control device (11) increases the speed when the rotation speed (Rx) detected by the rotation speed sensor (S1) is larger than the reference rotation speed (Rs) for work, and The speed change motor (14) is configured to decelerate when the detected rotation speed (Rx) is smaller than the reference rotation speed (Rs).
It is designed to operate. Also, in non-working condition,
The detected rotation speed (Rx) is the reference rotation speed for non-work (Rn
), the speed is increased when the detected rotation speed (Rx) is smaller than the reference rotation speed (Rn), and the speed is decreased when the detected rotation speed (Rx) is smaller than the reference rotation speed (Rn).
Deviation between B rotation speed (Rn) and the detected rotation speed (Rx) (
The larger the deviation (D), the larger the shift amount, and the deviation (D)
The speed change operation is performed in a state in which the speed change amount on the deceleration side is larger than the speed change amount on the speed increase side per unit amount of.

To explain the adjustment of the speed change operation speed by the speed change motor (14), although detailed description will not be given, the speed change operation speed adjustment by the speed change motor (14) will be explained.
14) is operated intermittently and its operating speed is adjusted.

That is, the ON time (T) for intermittently operating the variable speed motor (14) at a set cycle is changed according to the previous deviation (D).

Next, the operation of the control device (11) will be explained based on the flowchart shown in FIG.

First, moving average processing of the engine speed is performed to obtain a moving average value.

Then, it is determined whether the threshing switch (S2) is ONL and the threshing device (2) is in a driving state.

When the threshing switch (S2) is ON, the stock sensor (S0) is checked. If it is ON, it is determined whether the reaping operation has started or is in progress by determining whether the reaping operation has changed from the OFF state to the ON state.

When it is determined that it is the time to start reaping work by changing from the OFF state to the ON state, the moving average value is set and stored as (DE), and the rotation speed sensor (S1
) The value obtained by subtracting the set value (K) from the current rotation speed (Rx) detected at
s).

After setting the reference rotation speed (Rs), the deviation (D) between the reference rotation @ (Rs) and the rotation speed (Rx) detected by the rotation speed sensor (S1) is calculated, and the deviation (
By comparing the size of D) with the set dead zone, it is determined whether an increase/deceleration operation is necessary.

In a neutral state where the deviation (D) is within the set dead zone and no acceleration/deceleration operation is required, the speed change motor (14) is turned on.
Set the time (T) to zero and stop the gear shifting operation.

The deviation (D) is i l! with respect to the set dead zone. 1.
! If it is greater than 1, a value obtained by multiplying the deviation (D) by a proportionality constant (Ks) set and stored in advance is set as the ON time (T) for deceleration operation.

If the deviation (D) is large on the positive side with respect to the set dead zone, the value obtained by multiplying the proportionality constant (Ks) by the deviation (D) is set as the ON time (T ). In other words, this process corresponds to the vehicle speed control means (100).

If it is in a non-reaping work state, the set and stored value (X)
is set as the reference rotation speed (Rn) for non-working use. Then, a deviation (D) between the detected rotation speed (Rx) and the non-working reference rotation speed (Rn) is calculated.

The subsequent processing is almost the same as in the reaping work state, but the proportional constant for deceleration (Knz) is changed from the proportional constant for speed increase (K
n+).

In other words, this process corresponds to the auxiliary vehicle speed control means (lot).

After setting the ON time (T), set the ON time (T).
), output processing is performed to drive the speed change motor (14).

Incidentally, when the threshing clutch (S2) is OFF, the ON time (T) is set to zero and the speed change operation is stopped.

[Another example]

In the above embodiment, the speed change operation is performed in a state where the speed change amount on the deceleration side is larger than the speed change amount on the speed increase side in the non-working state, but the speed increase operation may not be performed.

Furthermore, in the above embodiment, the shift operation amount is determined by the detected rotational speed (Rx
) and the set rotation speed (Rs), (Rn) deviation (D)
We have illustrated the case where the configuration is configured so that it increases or decreases in proportion to
The specific configuration of each part can be changed in various ways, such as by preparing a table of values corresponding to the deviation (D) and storing the table in advance, and reading out the table according to the calculated deviation (D).

Further, although an embodiment has been shown in which the present invention is applied to a combine harvester as a working vehicle, it can be applied to various working vehicles such as a tractor or a rice transplanter.

Incidentally, although reference numerals are written in the claims section for convenient comparison with the drawings, the present invention is not limited to the structure shown in the accompanying drawings.

[Brief explanation of the drawing]

The drawings show an embodiment of the vehicle speed control device for a working vehicle according to the present invention, in which FIG. 1 is a block diagram of a control configuration, FIG. 2 is a flowchart of control operation, and FIG. 3 is a schematic side view of a combine harvester. (2)...Working equipment, (9)...Transmission, (E)...Engine, (S1)...
...Rotation speed detection means, (Rx)...Detected rotation speed, (Rs), (Rn)...Reference rotation speed, (
S0)... Working status detection means, (100)...
... Vehicle speed control means, (101) ... Auxiliary vehicle speed control means, (D) ... Deviation.

Claims (1)

[Scope of Claims] 1. A speed change device (9) for traveling and a working device (2) are interlocked and connected to the engine (E), and a rotation speed detection means ( S_1), and when the detected rotational speed (Rx) of the rotational speed detection means (S_1) is larger than the reference rotational speed (Rs) for work, the speed is increased, and the detected rotational speed (Rx) is Standard rotation speed for work (R
vehicle speed control means (100) that automatically operates the transmission (9) based on the detection information of the rotation speed detection means (S_1) so as to reduce the speed when the speed is smaller than s). , a working state detection means (S_0) for detecting whether the working vehicle is in a working state is provided, and the vehicle speed control means (100) detects that the working state detecting means (S_0) is in a working state. A vehicle speed control device for a work vehicle configured to control the vehicle only when the vehicle is in operation, wherein the detected rotation speed (Vx) of the rotation speed detection means (S_1) is smaller than the reference rotation speed (Vn) for non-work use. In this case, auxiliary vehicle speed control means (101) configured to automatically operate the transmission (9) based on the detection information of the rotation speed detection means (S_1) is provided so as to reduce the speed. . A vehicle speed control device for a work vehicle, wherein the auxiliary control means (101) is configured to perform a control operation only when the work state detection means (S_0) detects that the work state is in a non-work state. 2. The vehicle speed control device for a work vehicle according to claim 1, wherein the auxiliary vehicle speed control means (101) is configured to control the detected rotational speed (R
The transmission device (9) is automatically operated based on the detection information of the rotation speed detection means (S_1) so as to increase the speed when the rotation speed x) is larger than the non-working reference rotation speed (Rn). The auxiliary vehicle speed control means (
101) is a shift amount that increases as the deviation (D) between the non-working reference rotation speed (Rn) and the detected rotation speed (Rx) increases, and the shift amount increases per unit amount of the deviation (D). The gear change operation is performed in a state where the amount of speed change on the deceleration side is larger than the amount of speed change on the speed increase side.