Controller of engine-driven work vehicle

Abstract

To provide a controller of an engine-driven work vehicle that drives a work machine while traveling, and performs work, and which can perform efficient work by outputting high output as necessary while performing work with low fuel consumption.SOLUTION: A controller of an engine-driven work vehicle equipped with a diesel engine 1 comprising an exhaust gas purification device (PDF) 4 is provided with a green mode control operation with reduced engine output and a high-output power mode control operation. When a differential pressure sensor 3 of the PDF 4 detects a regeneration signal during the green mode control operation, the work vehicle switches to the power mode control operation, and performs display of being in the power mode control operation on a control device.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a control device for a work vehicle that is driven by an engine to perform work. [Background technology]

[0002] As described in JP 2006-94753 A, some engine-driven work vehicles have a control device that stops the engine or reduces engine output when the vehicle stops traveling or the drive of the work equipment is stopped in order to reduce engine fuel consumption, thereby minimizing fuel consumption and allowing work to be carried out for long periods of time. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-94753 Summary of the Invention [Problem to be solved by the invention]

[0004] To provide a control device for an engine-driven working vehicle that drives a working machine while traveling and performs work, and that can perform efficient work by outputting high output as needed while performing work with low fuel consumption. [Means for solving the problem]

[0005] The above-mentioned object of the present invention is achieved by the following technical means.

[0006] The invention of claim 1 is a control device for an engine-driven work vehicle equipped with a diesel engine 1 equipped with an exhaust gas purification device (PDF) 4, which is characterized by having a green mode control operation that reduces engine output and a high-output power mode control operation, and when the differential pressure sensor 3 of the PDF4 detects a regeneration signal during green mode control operation, switching to power mode control operation and displaying on the steering device that power mode control operation is in progress.

[0007] The invention of claim 2 is a control device for an engine-driven work vehicle, characterized in that an overheat sensor 22 is provided to detect overheating of the engine 1, and when an overheat temperature is detected, an overheat alarm is output, and in response, the operator operates the engine stop switch 23 to reduce the rotation of the engine 1 to idling rotation, and the engine 1 is stopped after a predetermined time.

[0008] The invention of claim 3 is a control device for an engine-driven work vehicle as described in claim 2, characterized in that when the operator operates the engine stop switch 23 when an overheat alarm is issued, the output clutch to the work implement 21 is disengaged, the engine 1 is reduced to idling speed, and the engine 1 is stopped after a predetermined time has elapsed. [Effects of the Invention]

[0009] In the invention of claim 1, when the differential pressure sensor 3 detects a regeneration signal, the exhaust gas purification device 4 of the diesel engine 1 must perform a regeneration process by increasing the engine 1 output power and raising the PDF4 temperature to eliminate particulate matter clogging the filter, which causes the engine 1 to output at high power. However, by changing the green mode display on the control device to the power mode display, the operator is made aware of the reason why the engine 1 output power has increased, and can continue working without confusion.

[0010] In the invention of claim 2, when the overheat sensor 22 detects overheating of the engine 1, it issues an overheat alarm, and even if the pilot tries to stop the engine 1 by hastily operating the engine stop switch 23, the engine 1 does not stop immediately, but instead reduces the rotation of the engine 1 to idling rotation and stops the engine 1 after a predetermined time, so that the engine 1 does not suffer heat shock damage due to a rise in temperature caused by a sudden stop of operation.

[0011] In the invention of claim 3, by operating the engine stop switch 23, the drive clutch of the work equipment 21 is disengaged to reduce the drive load, the engine speed is reduced to idling speed, and the engine 1 is stopped after a predetermined time has elapsed, so that work can be stopped safely without putting strain on the work equipment 21 and engine 1. [Brief explanation of the drawings]

[0012] [Figure 1] 1 is a control block diagram of an exhaust gas purification system for a diesel engine of a control device for an engine-driven work vehicle according to an embodiment of the present invention. [Figure 2] This is a graph of the engine's output in green mode and power mode. [Figure 3] FIG. 1 is a right side view of a riding rice transplanter as an embodiment of a work vehicle. [Figure 4] 1A and 1B are front views of the instrument panel of a riding rice transplanter, respectively, during normal operation, at the start of PDF playback, and at the end of playback. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described with reference to the accompanying drawings.

[0014] Figure 1 is a block diagram of the control system for a diesel engine 1. The exhaust gas differential pressure passing through the filter of an exhaust gas purification device (PDF) 4 is detected by an exhaust gas differential pressure detection sensor 3, and the rotation of the diesel engine 1 is controlled by a control device 2. When the differential pressure increases and a clogged filter is detected, the rotation of the diesel engine 1 is increased to the regeneration limit pressure, raising the exhaust gas temperature and burning off particulate matter clogging the filter, clearing the PDF 4. The work machine shown in Figure 3 is equipped with an engine stop switch 23. When an overheat sensor 22 installed on the engine 1 detects an overheat temperature, an overheat alarm is sounded. Pressing the engine stop switch 23 disengages the drive clutch to the work machine, switches the hydrostatic continuously variable transmission to a stop, and operates the engine stop switch 23 to stop the alarm. After a predetermined time, the engine 1 is stopped. The engine stop switch 23 may also be the ignition key that starts the engine 1.

[0015] Figure 2 shows the output graph of diesel engine 1. When operating the work equipment during normal work, the engine 1 is used in green mode operation, which consumes less fuel and operates at low revolutions. When regeneration of the exhaust gas purification device is required, the engine increases fuel consumption and operates in power mode at high revolutions, and when the regeneration process is complete, the engine is controlled to return to green mode.

[0016] In the driver's seat of the work vehicle, a green mode operation display is displayed during normal operation, and when the vehicle enters power mode operation, the display switches to a power mode operation display, informing the driver of power mode operation along with PDF playback processing, thereby informing the driver of the reason why engine 1 is outputting high power.

[0017] Figure 3 shows a riding rice transplanter as a work vehicle, with a front panel 15 on which a steering handle 16 is mounted upright on top of a traveling body 10 which travels on left and right front wheels 11, 11 and left and right rear wheels 12, 12, and a driver's seat 14 mounted in a drive box 13 mounted with an engine 1 at the rear, an auxiliary work platform 18 on which an assistant worker sits is mounted behind the driver's seat 14, and a seedling tank 20 and transplanter 21 which serve as work equipment with a lifting mechanism are attached to the rear of the traveling body 10. An overheat sensor 22 is provided in the engine 1 which issues an alarm if the engine 1 overheats.

[0018] Upon hearing the warning, the pilot presses the engine stop switch 23 to reduce the rotation speed of the engine 1 to idling and stop the engine 1 after a predetermined time. This prevents damage to the engine 1 due to a sudden rise in temperature, and then the engine can be cooled.

[0019] A USB charging port 17 is provided on the front panel 15 on the side facing the pilot's seat 14, and a USB charging port 19 is also provided on the auxiliary work platform 18 on the side facing the pilot's seat 14, allowing the pilot and auxiliary workers to charge their mobile phones. The USB charging port 17 may have two or three ports.

[0020] Figure 4 is a front view of the instrument panel provided in front of the steering wheel 16, showing (A) normal operation, (B) when PDF playback starts, and (C) during PDF playback. The speedometer 31 displays the playback level at (B), and the playback progress status is displayed with a needle at (C). The central operation display section 30 displays "PDF playback in progress" at (C). 32 is an operation switching button.

[0021] In addition, in a common rail engine that controls the rotation of engine 1 by adjusting the injected fuel, when the intake temperature is lower than normal, it is preferable to control the engine rotation speed by increasing the injection control amount by an increase coefficient to the normal injection amount. [Explanation of symbols]

[0022] 1. Diesel engine 3 Exhaust gas differential pressure detection sensor 4 Exhaust Gas Purification Device (PDF) 22 Overheat sensor 23 Engine stop switch

Claims

1. The control device for an engine-driven work vehicle equipped with a diesel engine (1) equipped with an exhaust gas purification device (PDF) (4), the control device provides a green mode control operation in which engine output is suppressed and a power mode control operation in which engine output is high, and when a differential pressure sensor (3) of the PDF (4) detects a regeneration signal during green mode control operation, the control device switches to power mode control operation and displays on the steering device that power mode control operation is in progress.

2. This control device for an engine-driven work vehicle is characterized in that an overheat sensor (22) is provided for detecting overheating of an engine (1), and when an overheat temperature is detected, an overheat alarm is output, and in response, the driver operates an engine stop switch (23) to reduce the rotation of the engine (1) to idling rotation, and stops the engine (1) after a predetermined time.

3. 3. A control device for an engine-driven work vehicle as described in claim 2, characterized in that when an overheat warning is issued and the driver operates the engine stop switch (23), the output clutch to the work machine (21) is disengaged, the engine (1) is reduced to idling speed, and the engine (1) is stopped after a predetermined time has elapsed.

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