WO2014116058A1

WO2014116058A1 - Control system and control method for engine rpm of agricultural vechicle

Info

Publication number: WO2014116058A1
Application number: PCT/KR2014/000710
Authority: WO
Inventors: 감병우
Original assignee: 대동공업 주식회사
Priority date: 2013-01-24
Filing date: 2014-01-24
Publication date: 2014-07-31
Also published as: KR20140095210A

Abstract

Disclosed are a control system and control method for engine RPM of an agricultural vehicle having an electronic engine. The RPM control system, according to one aspect of the present invention, comprises: a detection means which has left and right brake pedals for stopping the rotation of left and right wheels, respectively, and which detects whether or not the two brake pedals are interlocked to each other; an engine cruise control (ECC) ON/OFF switch for receiving an operating command for maintaining the RPM at a normal speed; and an engine control unit (ECU) for normally controlling the RPM according to a value set by a foot accelerator pedal or a hand accelerator lever when an electrical signal is received through the ECC ON/OFF switch, wherein a control for maintaining or releasing an ECC mode is carried out according to whether the interlocking of the brake pedals is detected by the detection means in the ECC mode according to the ON state of the ECC ON/OFF switch.

Description

Engine RPM Control System and Control Method for Farm Vehicles

The present invention relates to an engine speed control system and a control method, and more particularly, to an engine speed control system and a control method for an agricultural work vehicle equipped with an electronic engine.

Agricultural work vehicles, called tractors, are structurally similar to ordinary cars but are equipped with powerful engines and are mainly used for cultivation due to their good traction and robustness. It is possible to selectively attach or detach various types of work tools.

Of the power output from the engine, the non-shifting power is provided as the power for driving the work machine connected to the rear of the body via a power take-off PTO shaft directly connected to the engine output shaft, and is suitable for driving or work through the peripheral gear and the sub-shifting device. Power shifted at speed is provided to the wheel side via a power transmission shaft connected to the transmission.

Since the work machine is driven by the non-variable engine power as described above, the driving speed is determined by the engine speed (RPM). Therefore, when the work is connected to the work machine, the load is significantly affected by the road environment. If the engine speed is caught, the work machine driving speed is also lowered, there is a problem that it is difficult to expect even work quality.

Accordingly, even if a load is applied to the engine during a work environment according to the road surface environment, a technique for solving the above-mentioned problems of the prior art is provided through an engine cruise control (ECC) function that maintains a constant engine speed regardless of the engine load. Proposed through Korean Patent Publication No. 2012-0081375 (prior patent by the present applicant).

The disclosed patent discloses a rotation set by a larger value among main signals of two axel means (hand axel, foot axel) within the maximum allowable torque range regardless of engine load when ECC mode is executed. Control to keep the engine speed constant in the water channel is performed, so that the engine speed does not fall even under load operation.

The ECC mode is configured to be automatically released when the ECC on / off switch is turned off or the brake pedal or clutch pedal is pressed.When the ECC mode is released, the sensor detects the displacement of the axel means (hand axel or foot axel). Then, the mode is switched to the normal mode in which the increase and decrease of the engine speed is controlled to a value corresponding to the displacement.

However, even if the ECC mode needs to be maintained continuously, such as simply changing the direction of the aircraft during the operation, if you step on the brake pedal a little for safe direction, the ECC mode is automatically released to work in the turning section. The continuity of, and the operational hassle to operate the ECC switch again after the change of direction.

The technical problem to be solved by the present invention, when working in the ECC mode that maintains a constant engine speed, agricultural work vehicle that allows the ECC mode can be continuously maintained even if the brake is operated according to the use of the single brake To provide an engine speed control system and control method of the.

According to an aspect of the present invention as a means for solving the above problems, it is applied to an agricultural work vehicle having two left and right brake pedals for braking each of the left and right driving wheels, detecting whether the two brake pedals are interlocked. Sensing means; An engine cruise control (ECC) ON / OFF switch to which an operation command for maintaining engine speed at a constant speed is input; And an engine control unit (ECU) configured to control the engine speed at a constant speed by a value set by a foot axel pedal or a hand axel lever when an electrical signal is input through an ECC on / off switch. In the ECC mode according to ON, control for maintaining or releasing the ECC mode is performed through the engine control unit (ECU) depending on whether the brake pedal detected by the sensing means is interlocked. It provides an engine speed control system of a farming vehicle, characterized in that.

Here, when the brake pedal detected by the sensing means is detected as interlocked, when a single brake operation (only one of the brake pedals is operated) is detected, control to maintain the ECC mode is performed through the engine control unit. Can be.

On the contrary, when a brake linkage operation (simultaneous operation of two left and right brake pedals) is detected as a result of detecting whether the brake pedal is interlocked by the detection means, control to release the ECC mode through the engine control unit may be performed. Can be.

In the present embodiment, the sensing means is two left and right brake switches that are switched on / off according to the movement of the left and right brake pedals, or a connection link for detecting whether the left and right brake pedals are connected through the connection link. It may be a sensing sensor.

The engine speed control system according to an aspect of the present invention may further include an increase and decrease switch for operating the engine speed increase and decrease in a state in which the ECC mode is being executed.

According to another aspect of the present invention as a means for solving the problem, according to the driver selection for switching to the ECC mode (Engine cruise control mode) to maintain a constant engine speed when the ECC on / off switch is ON (ON) Executing control;

When the brake pedal operation is detected during ECC mode execution, determining, by the engine control unit (ECU), whether the interlocking operation of the left and right brakes or the single brake operation is performed based on information provided from the sensing means;

And performing control to maintain the ECC mode (Engine cruise control mode) being executed when it is determined that the single brake operation is performed.

According to the embodiment of the present invention, even if the brake is pressed for the change of the gas direction during operation in the ECC mode, if the brake operation is a single brake operation in which only one of the two left and right brake pedals is operated, the operation is continuously performed. The ECC mode can be continuously maintained as determined by the engine control unit ECU.

Therefore, it is possible to continuously work in a state in which the machine speed is kept constant even in the direction change section requiring brake operation, which can improve the work efficiency and evenly improve the overall work quality of the work surface. Can be. In addition, it is possible to eliminate the conventional operational inconvenience of having to operate the ECC switch again after the change of direction.

1 is a system block diagram schematically showing the overall configuration of the agricultural engine vehicle engine speed control system according to an embodiment of the present invention.

Figure 2 is a schematic diagram showing an embodiment for detecting whether the two left and right brake pedals interlock.

Figure 3 is a schematic diagram showing another embodiment for detecting whether the left and right two brake pedals interlocked.

4 is a flowchart illustrating a control logic for controlling engine speed according to the present invention.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The system related to engine speed control shown in FIG. 1 includes an engine control unit 40 (hereinafter referred to as "ECU") which collectively controls the operation of the engine 90 as a power source. And an engine cruise control (ECC) on / off switch 30 for switching to an engine cruise control mode (ECC) that maintains a constant engine speed.

Engine 90 may be a multi-cylinder diesel-engine that is electronically controlled through ECU 40, and ECU 40 may be associated with ECC mode execution via the ECC on / off switch 30. When the operation signal is input, control is performed to maintain the engine speed at a value set by the hand axel lever 20 or the foot axel pedal 10.

The ECU 40 determines the injection amount and timing of the fuel based on the intake air amount from the air flow meter and the position information of the piston obtained from the crank angle sensor, thereby providing the fuel injection device 80. The signal is transmitted to the injector 84 constituting the injector 84, and the injector 84 injects fuel into the cylinder at the fuel injection amount and timing instructed according to the signal.

Through operation of the ECC on / off switch 30, an electrical signal relating to the execution of the ECC mode for maintaining the engine 90 rotational speed at a constant speed is turned on / off, and the ECU 40 switches the ECC on / off switch 30. It is periodically determined whether the electrical signal associated with the switch to the ECC mode meets the ECC mode execution condition, and outputs a control signal for ECC mode execution if satisfied.

Of the power output from the engine 90, the non-shifting power is provided as power for driving a work machine (not shown) connected to the rear of the body via the power take-off PTO shaft 100 directly connected to the engine output shaft, Power shifted at a speed suitable for travel or work via the transmission 110 is provided to the wheel as power for driving through a power transmission shaft connected to the transmission.

The engine 90 is equipped with a common rail fuel injection device 80 that electronically controls fuel injection amount and injection timing according to the control of the ECU 40. The fuel injection device 80 includes a common rail 83, a common rail. It consists of a fuel pump 82 which operates by ECU 40 control based on the output of the pressure sensor 85 which detects the internal pressure of a rail, the pressure sensor 85, etc., and the several injector 84 mentioned above.

The ECU 40 is electrically connected to the foot axel pedal sensor 12 and the hand axel lever sensor 22 for detecting displacement of the foot axel pedal 10 or the hand axel lever 20, respectively. (12) Based on the displacement detection value of the pedal or lever detected by the hand axel lever sensor 22, the control value of the fuel injection device 80 is calculated and output as a signal.

The braking force for braking the gas during driving or work is generated by the hydraulic pressure generated by the master cylinder when operating the brake pedal 60 provided on the driver's footrest, and the braking device including the brake pedal 60 and the master cylinder is left and right. The left and right driving wheels (rear wheels) can be independently braked or braked in two groups.

The two left and

right brake pedals

60a and 60b, which are provided for braking of the left and right driving wheels respectively, are mechanically connected to interlock with each other through a mechanical linkage, for example, the connecting link 62 of FIG. 2 or 3. According to whether or not it has a linked movement or can move independently, the sensing means 65 detects whether the two brake pedal (60a) (60b) is interlocked or in the state of the interlock operation.

The sensing means 65 includes two left and

right brake switches

65a and 65b which are switched on and off according to the movement (displacement) of each of the left and

right brake pedals

60a and 60b as shown in FIGS. 1 and 2. 3 or a connection link detection sensor 65c that detects whether the connection link 62 is fastened and outputs information on whether two pedals are in a linkable state as shown in FIG. 3.

When the brake switches 65a and 65b are applied as the sensing means 65, even when only one of the two brake pedals is pressed when the connecting link 62 is engaged, the two move together so that the

brake switches

65a and 65b are turned on. (ON), and when the link link 62 is not fastened, only the selected and operated brake pedal moves independently so that only the corresponding switch is turned ON.

Therefore, when an electrical signal generated by the brake pedal operation is generated, the two brake pedals 60a ( It is easy to know whether 60b) is being operated in conjunction with or independently.

When the connection link detection sensor 65c is applied as the detection means 65, whether the two brake pedals can be interlocked by simply detecting whether the connection link 62 which connects the two brake pedals to be interlocked with each other is connected. Can be judged more easily. This is because the two

brake pedals

60a and 60b may only mechanically move together when one of the two links is engaged.

Information related to the interlocking of the two brake pedals detected by the sensing means 65 is transmitted to the ECU 40, and the ECU 40 is operated in the state in which the ECC on / off switch 30 is turned on. Based on the information provided by the sensing means 65, the fuel injection device 80 is controlled so that the ECC mode can be maintained continuously or the ECC mode can be released.

That is, the control to maintain the ECC mode when a single brake operation (only one of the brake pedals) is detected as a result of detecting whether the brake pedal 60 is detected by the detection means 65 is interlocked. It is performed by the ECU 40, and the brake interlocking operation (simultaneously of two left and right brake pedals) Operation) When a situation is detected, control to release the ECC mode is performed.

When switching to ECC mode, the ECU 40 grasps the current driving state of the vehicle at the time when the ECC on / off switch 30 signal is input, and the driving state satisfies the switching switching condition to ECC mode. Only switch to ECC mode. That is, the ECU 40 determines whether the condition for executing the ECC mode is satisfied and controls to switch to the ECC mode only when the ECU 40 meets the condition.

As the execution condition for switching to the ECC mode, the driving state in which the ECC on / off switch 30 is on and the operation of the brake pedal 60 and the clutch pedal 70 is not detected. In this case, the engine may be rotating within an appropriate engine speed range (for example, 1500 ≤ engine speed ≤ 2600 per minute) to ensure safety.

When the execution condition of the ECC mode is satisfied and the ECC mode is executed, the ECU 40 compares the engine speed set by the foot axel pedal 10 and the hand axel lever 20 at the time when the ECC mode is switched, The control is started to select a larger value among the engine speeds set by the foot axel pedal 10 and the hand axel lever 20 to keep the engine speed constant at the set speed.

While driving or working in the ECC mode, the engine speed can be appropriately increased and decreased by operating the increase / decrease switch 50 electrically connected to the ECU 40, and the ECC on / off switch 30 is turned off. ECC mode is automatically released when there is a switch operation or clutch operation, or when the interlocking operation situation of the left and

right brake pedals

60a and 60b is detected through the sensing means 65 as described above.

However, even when the brake operation status is detected through the sensing means 65, when the single brake operation in which two brakes are operated separately (only one of the brake pedals is operated) is detected, the aircraft proceeds during the operation. It is determined that the direction is changed, that is, it is determined that the work is in progress continuously, and control is continued to maintain the ECC mode.

An engine speed control process performed by the engine speed control system having the above-described configuration will be described in connection with the control system operation.

Figure 4 shows a specific control logic for the engine speed control implemented by the speed control system of the present invention.

Referring to FIG. 4, when the ECC on / off switch is set to ON by a driver selection operation, the ECU first determines whether the current driving state of the vehicle meets the above-described ECC mode execution condition, and determines that the ECC mode is executed. If the conditions are met, control to switch to and maintain the ECC mode is done via the ECU.

When switching to the ECC mode, the ECU compares the engine speed setting values by the foot axel pedal and the hand axel lever at the time of switching to the ECC mode, selects a larger value among them, and recognizes it as the set speed. Control is performed to keep the engine speed constant at the set rotation speed.

In ECC mode, the positional change of the foot axel pedal or hand axel lever is ignored, and only when a signal related to the engine speed setting change is input through the increase / decrease switch operation, the engine speed increases or decreases to a desired condition corresponding to the increase / decrease switch operation. You can. Of course, if there is no increase and decrease switch operation, the control which maintains engine speed in accordance with the said set rotation speed will continue.

In ECC mode, when the ECC on / off switch is turned off, when the left and right brake pedals are operated simultaneously, when the clutch is operated, or when the engine speed is detected outside the specified speed range, the ECU receives the signal. By the control of the ECC mode is released, and returns to the normal control mode before the execution of the ECC mode.

In normal control mode, the engine speed, or speed, can be controlled by the displacement of the foot axel pedal or hand axel lever.When the engine is turned off due to user intervention or other factors during ECC mode execution, the ECC mode is automatically stopped and the engine restarts. Even when driven, ECC mode is not automatically executed unless the user inputs an ECC on / off switch.

Even when the brake operation is detected, the engine control unit (ECU) determines whether the left and right brakes are interlocked operation or single brake operation based on the information provided from the sensing means, and the single brake operation in which the two brakes are operated separately. When it is determined that the situation, it is recognized as a brake operation for switching the simple gas traveling direction during the operation to control to maintain the ECC mode.

According to the embodiment of the present invention described above, even if the brake is pressed to switch the gas traveling direction during the operation in the ECC mode, if the brake operation is one-hand brake operation of only one of the two left and right brake pedals, the work continuously The ECC mode can be continuously maintained by the engine control unit (ECU) recognizing that this is in progress.

In the detailed description of the present invention, only specific embodiments thereof have been described. It is to be understood, however, that the present invention is not limited to the specific forms referred to in the description, but rather includes all modifications, equivalents, and substitutions within the spirit and scope of the invention as defined by the appended claims. Should be.

The present invention can independently or simultaneously brake the left and right driving wheels and the ECC (Engine Cruise Control) function that maintains a constant engine speed regardless of the engine load even when the engine is under load depending on the road environment. It is usefully applicable to agricultural work vehicles equipped with a brake pedal.

Claims

Applies to agricultural work vehicles equipped with two left and right brake pedals for braking the left and right driving wheels respectively.

Sensing means for detecting whether two brake pedals are linked;

An engine cruise control (ECC) ON / OFF switch to which an operation command for maintaining engine speed at a constant speed is input; And

And an engine control unit (ECU) for controlling the engine speed at a constant speed by a value set by a foot axel pedal or a hand axel lever when an electrical signal is input through an ECC on / off switch.

In the engine cruise control mode according to the ECC on / off switch on, the control for maintaining or releasing the ECC mode according to whether the two brake pedals detected by the sensing means is controlled is the engine control unit. An engine speed control system for an agricultural work vehicle, characterized in that being carried out via (ECU).
The method of claim 1,

As a result of detecting whether or not the two brake pedals are detected by the sensing means, a control is performed to maintain the ECC mode through the engine control unit when a single brake operation (only one of the brake pedals is operated) is detected. An engine speed control system for an agricultural work vehicle, characterized in that.
The method of claim 1,

As a result of detecting whether or not the two brake pedals are detected by the sensing means, when the brake interlocking operation (simultaneous operation of the two left and right brake pedals) is detected, the control to release the ECC mode is performed through the engine control unit. An engine speed control system for an agricultural work vehicle.
The method according to any one of claims 1 to 3,

The sensing means, the engine speed control system of a farming vehicle, characterized in that the two left, right brake switches that are switched on / off according to the movement of the left and right brake pedal.
The method according to any one of claims 1 to 3,

The sensing means is an engine speed control system for a farming vehicle, characterized in that the connection link detection sensor for detecting whether the left and right brake pedal is connected through the link.
The method of claim 1,

And an increase / decrease switch for generating a signal of an engine speed increase / decrease operation while the ECC mode is being executed.
In an agricultural work vehicle having two left and right brake pedals for braking each of the left and right driving wheels,

Executing control for switching to an ECC mode (Engine cruise control mode) which maintains a constant engine speed when the ECC on / off switch is turned on according to driver selection;

When the brake pedal operation is detected during execution of the ECC mode, determining, by the engine control unit, whether the interlocking operation of the left and right brakes or the single brake operation; And

And performing control for maintaining an ECC mode (Engine cruise control mode) being executed only when it is determined that the single brake operation is performed.