JP2009156140A - Engine control system for working machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an engine control device for a working machine capable of increasing versatility of an engine ECU. <P>SOLUTION: The engine ECU 1 and an EUC 4 separate from the engine ECU 1 are connected by a communication line 6. A storage means 1a of the engine ECU 1 stores data for setting fuel supply quantity, and a storage means 4a of the separate ECU 4 stores data for setting engine control command having control characteristics corresponding to work characteristics of a working device 3. The separate ECU 4 or the engine EUC 1 operates command engine speed and command engine torque based on the data for setting engine control command. The engine EUC 1 operates target fuel supply quantity of the engine fuel supply device 5 based on the command information and the data for setting fuel supply quantity. The engine ECU 1 controls fuel supply quantity of an engine fuel supply device 5 based on the target fuel supply quantity. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an engine control device for a work implement, and more particularly to an engine control device for a work implement that can improve the versatility of an engine ECU.

As a conventional engine control device for a working machine, although it is not a publicly known invention, there is the following technique as a technique known to the inventor of the present invention.
That is, an engine control device for a work machine that controls the engine according to the work characteristics of the work device driven by the engine,
The storage means of the engine ECU stores fuel supply amount setting data and engine control command setting data having control characteristics corresponding to the work characteristics of the work device,
The engine ECU calculates a command engine speed and a command engine torque based on the engine control command setting data, and the engine ECU supplies an engine fuel supply device based on the command information and the fuel supply amount setting data. There is one that controls the fuel supply amount.

  However, the above technique has a problem because the engine control command setting data is stored in the storage means of the engine ECU.

The above prior art has the following problems.
<Problem> The versatility of the engine ECU was low.
Since engine control command setting data is stored in the storage means of the engine ECU, the engine ECU specializes in one type or a limited number of types of working devices due to the limited storage capacity of the storage means. There is no choice but to store control command setting data. For this reason, this engine ECU cannot be used as an engine ECU of an engine that drives other types of working devices, and the versatility of the engine ECU is low.

  An object of the present invention is to provide an engine control device for a work machine that can solve the above-described problems, that is, an engine control device for a work machine that can improve the versatility of an engine ECU.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1, an engine control device for a work machine that controls the engine (2) according to the work characteristics of the work device (3) driven by the engine (2),
An engine ECU (1) and a separate ECU (4) that is separate from the engine ECU (1) are linked via a communication line (6).
As illustrated in FIG. 2, the storage means (1 a) of the engine ECU (1) stores the fuel supply amount setting data (1 f), and the storage means (4 a) of the separate ECU (4) is the work device (3 ) Engine control command setting data (4c) having control characteristics corresponding to the work characteristics of
The separate ECU (4) or the engine ECU (1) calculates the command engine speed (A) and the command engine torque based on the engine control command setting data (4c),
As illustrated in FIG. 3, the engine ECU (1) calculates the target fuel supply amount (C) of the engine fuel supply device (5) based on the command information and the fuel supply amount setting data (1f). The engine control device for a working machine is characterized in that the engine ECU (1) controls the fuel supply amount of the engine fuel supply device (5) based on the target fuel supply amount (C). .

(Invention according to Claim 1)
<Effect> The versatility of the engine ECU can be enhanced.
As illustrated in FIG. 2, the engine control command setting data (4c) having the control characteristics corresponding to the work characteristics of the work device (3) is stored in the storage means (4a) of the separate ECU. ) Storage means (1a) need not store engine control command setting data (4c), and an engine ECU (1) that is not specific to the type of work device (3) can be produced. The versatility of the engine ECU (1) can be improved.

(Invention according to Claim 2)
In addition to the effect of the invention according to claim 1, the following effect is achieved.
<Effect> Regardless of the type of work device, the exhaust gas regulation can be collectively managed by the engine ECU.
As illustrated in FIG. 2, the storage means (1a) of the engine ECU (1) stores fuel supply limit amount setting data (1c). As illustrated in FIG. 3, the engine ECU (1) Since the fuel supply exceeding the fuel supply limit amount (D) based on the fuel supply limit amount setting data (1c) is restricted, the exhaust gas regulation is managed by the engine ECU (1) regardless of the type of the work device (3). ) Can be managed collectively.

<Effect> The engine control command setting data of the separate ECU can be freely set within a range less than the fuel supply limit amount based on the fuel supply limit amount setting data of the engine ECU.
As illustrated in FIG. 3, when the target fuel supply amount (C) is less than the fuel supply limit amount (D), the engine ECU 1 supplies the engine fuel supply based on the target fuel supply amount (C). Since the fuel supply amount of the device (5) is controlled, the engine control command setting data (4c) of the separate ECU (4), which is the basis for calculating the target fuel supply amount (C), is the engine ECU (1). The fuel supply limit amount setting data (1c) can be freely set within a range less than the fuel supply limit amount (D).

(Invention according to claim 3)
In addition to the effect of the invention according to claim 1 or claim 2, the following effect is achieved.
<Effect> The engine ECU can manage the basic basic performance of the engine.
As illustrated in FIG. 2, the storage means (1a) of the engine ECU (1) stores the no-load minimum rotation speed (B1) and the no-load maximum rotation speed (B2). Based on these, the engine ECU Since (1) manages the upper and lower rotational speeds of the normal operation rotational range (B), the engine ECU (1) can manage the main basic performance of the engine (2).

  Embodiments of the present invention will be described with reference to the drawings. FIGS. 1 to 3 are diagrams for explaining an engine control device for a working machine according to an embodiment of the present invention. In this embodiment, an engine control device for an agricultural tractor that pulls a rotary tilling work device will be described.

The outline of the embodiment of the present invention is as follows.
As shown in FIG. 1, the traveling body (7) of the agricultural tractor used in this embodiment is equipped with a diesel engine (2) and a mission case (8). The diesel engine (2) includes an engine fuel supply device (5). The engine fuel supply device (5) is a common rail fuel injection device (9). A work device (3) is arranged behind the mission case (8). This working device (3) is a rotary tillage working device (10). The rotary tilling work device (10) is connected to the traveling machine body (7) via the link mechanism (11), pulled by the traveling machine body (7), and lifted and lowered by driving the lifting and lowering actuator (23). The power of the diesel engine (2) is transmitted to the rear wheel (13) and the rotary tilling work device (10) via the mission case (8). Reference numeral (14) in FIG. 1 denotes a front wheel. This agricultural tractor engine control device controls the engine (2) in accordance with the work characteristics of the work device (3) driven by the engine (2).

The configuration of the rotary tilling device is as follows.
As shown in FIG. 1, the rotary tilling device (10) includes a tilling section (15). The cultivating section (15) includes a claw shaft (17) installed between a transmission case (16) on one side and a side frame (not shown) on the other side, and a cultivator attached to the claw shaft (17). It is comprised from a nail | claw (18). The tillage part (15) is covered with a main cover (19) from above and a rear cover (20) from behind. The rear cover (20) is swingably attached to the main cover (19) through a pivot (21). The rear cover (20) is grounded to the ground surface. An actual tilling depth detecting means (22) for detecting a swing angle of the rear cover (20) is attached to the pivot portion (21) of the rear cover (20).

The structure of the raising / lowering operation means of the rotary tilling work device is as follows.
As shown in FIG. 1, an elevating actuator (23) is arranged on the upper portion of the mission case (8), and a lower arm (24) is connected to a lift arm (24) of the elevating actuator (23) via a lift rod (25). 26) are interlockingly connected, and the rotary tilling work device (10) is moved up and down by swinging the lift arm (24). An actual lift position detection sensor (27) for detecting the swing angle of the lift arm (27) is attached to the lift actuator (23).

The control of the lift actuator is as follows.
As shown in FIG. 1, the lifting / lowering actuator (23) that lifts and lowers the rotary tilling work device (10) is controlled by a separate ECU (4) that is separate from the engine ECU (1). Connected to the separate ECU (4) are a forced raising / lowering operating means (28), a target tilling depth setting means (29), an actual tilling depth detecting means (22), and a lifting operation actuator (23). The storage means (4a) of the separate ECU (4) stores work data (4b), and the work data (4b) includes a plurality of work device data including data for rotary tillage work devices. ing. When the target plowing depth is set by the target plowing depth setting means (29) and the forced lowering operation is performed by manual operation of the forced elevating operation means (28), the separate ECU (4) stores the work data (4b). Based on the data for the rotary tilling work device, the lifting operation actuator (23) is controlled, the rotary tilling work device (10) is lowered to the target lowering position, and the actual working depth is automatically brought close to the target working depth. I do. When the forced lifting operation is performed by manual operation of the forced lifting operation means (28), the separate ECU (4) controls the lifting operation actuator (23) to bring the rotary tillage work device (10) to the non-grounding position. Raise.
When the working device (3) is a plow working device or a substitute working device, the separate ECU (4) operates based on the plow working device data or substitute working device data in the working data (4b). The operation of the device (3) is controlled.

The configuration of the common rail type fuel injection device is as follows.
The common rail fuel injection device (9) includes a fuel supply pump (30), a common rail (31), and a fuel injector (32). The fuel supply pump (30) supplies fuel from a fuel tank (32) to the common rail (31). ), The fuel is accumulated in the common rail (31), and this fuel is injected into the combustion chamber (not shown) by the fuel injector (32).

The control structure of the common rail type fuel injection device is as follows.
The fuel supply of the common rail fuel injection device (9) is controlled by the engine ECU (1).
As shown in FIG. 1, the engine ECU (1) includes an accelerator position detecting means (33), an actual engine speed detecting means (34), a crank angle determining means (35), a cylinder determining means (36), a fuel injector. The injection control valve (37) of (32) is connected, and the actual rail pressure detection means (38) and the discharge amount control valve (39) of the fuel supply pump (30) are also connected.

The configuration of the engine control device is as follows.
The engine ECU (1) and a separate ECU (4) separate from the engine ECU (1) are linked via a communication line (6). This communication line (6) is a CAN communication bus. The CAN communication bus is a communication line for performing data communication according to a CAN (controller area network) protocol. ECU means an electronic control unit.
The engine ECU (1) is attached to the engine (2), and the separate ECU (4) is attached to a place other than the engine (2) of the traveling body (7) (so-called this machine) on which the engine (2) is mounted. Yes. Each ECU (1), (4) is equipped with an ECU (Central Processing Unit), EEPROM (Electrically Erased / Programmable Single-Read Memory), Flash Memory, RAM (Random Access Memory), CAN Controller, Input Interface, The output interface is assembled.

As shown in FIG. 2, the flash memory of the engine ECU (1), that is, the storage means (1a) stores fuel supply amount setting data (1f). The fuel supply amount setting data (1f) is map data for calculating a target fuel supply amount (C) of the engine fuel supply device (5) from a command engine speed (A) and a command engine torque described later. These data correspond to each other.
The fuel supply amount setting data (1f) is calculation formula data for calculating the target fuel supply amount (C) of the engine fuel supply device (5) from the command engine speed (A) and the command engine torque. Also good.

The flash memory of the separate ECU (4), that is, the storage means (4a) stores engine control command setting data (4c) having control characteristics corresponding to the work characteristics of the work device (3). This engine control command setting data (4c) calculates the command engine speed (A) and the command engine torque based on the control information corresponding to the work characteristics of the work device (3) from the accelerator information and the engine load. The map data for this is a correspondence between these data. The engine load can be calculated from the accelerator position information and the actual engine speed. The engine load can also be detected by a strain gauge attached to the crankshaft.
The engine control command setting data (4c) is used to calculate the command engine speed (A) and the command engine torque based on the control information corresponding to the work characteristics of the work device (3) from the accelerator information and the engine load. The calculation formula data may be used.

The engine control command setting data (4c) includes a plurality of work device data including data for rotary tillage work devices. In this embodiment, since the work device (3) is a rotary tillage work device, the separate ECU (4) performs command engine rotation based on the rotary tillage work device data in the engine control command setting data (4c). The number (A) and the command engine torque are calculated.
When the working device (3) is a plow working device or a substitute working device, the separate ECU (4) is based on the plow working device data or the substitute working device data in the engine control command setting data (4c). Then, the command engine speed (A) and the command engine torque are calculated.
The control characteristics corresponding to the work characteristics of the work device (3) include, for example, control characteristics that obtain high torque over a wide engine speed range in order to suppress engine stalls for work with large load fluctuations, To improve work efficiency for work with small fluctuations, to reduce the impact of connection with control characteristics that reduce rotation fluctuation due to load fluctuations, and connection work of the power transmission clutch from the engine to the work equipment This refers to control characteristics that reduce the engine speed before connection.

The control procedure of the fuel supply amount of the common rail type fuel injection device is as follows.
When the engine ECU (1) transmits the accelerator position information and the actual engine speed information to the separate ECU (4), the separate ECU (4) rotates these information and the engine control command setting data (4c). Based on the tillage work device data, the command engine speed (A) and the command engine torque are calculated, and the separate ECU (4) transmits these command information to the engine ECU (1).
The engine ECU (1) calls the engine control command setting data (4c) on the engine ECU (1), and the engine ECU (1) reads the accelerator position information, the actual engine speed information, and the engine control command setting data ( The command engine speed (A) and the command engine torque may be calculated based on the data for the rotary tillage work device 4c).

The engine ECU (1) calculates a target fuel supply amount (C) of the engine fuel supply device (5) based on the command information and the fuel supply amount setting data (1f), and the engine ECU (1 ) Controls the fuel supply amount of the engine fuel supply device (5) based on the target fuel supply amount (C).
The fuel supply amount is controlled by adjusting the valve opening period of the injection control valve (37) of the fuel injector (32) and adjusting the fuel injection period.

The data stored in the storage means of the engine ECU is as follows.
The storage means (1a) of the engine ECU (1) stores basic performance data (1b) and fuel supply limit amount setting data (1c). The basic performance data (1b) includes fuel supply setting data (1d) and engine speed management data (1e). The fuel supply setting data (1d) includes fuel supply amount setting data, fuel supply timing setting data, and common rail pressure setting data. These data are map data, but may be calculation formula data. The engine speed management data (1e) includes a no-load minimum speed (B1) and a no-load maximum speed (B2).

Control of the engine ECU based on the above data is as follows.
The engine ECU (1) controls the fuel supply timing of the engine fuel supply device (5) based on the command information and the fuel supply timing setting data, and based on the command information and the common rail pressure setting data. Control common rail pressure. The fuel supply timing is controlled by controlling the opening timing of the injection control valve (37) of the fuel injector (32), and the common rail pressure is controlled by the discharge amount control valve (39) of the fuel supply pump (30). Is done by controlling.

The flow of fuel supply amount control processing by the engine ECU is as follows.
As shown in FIG. 3, in step (S1), it is determined whether or not the command engine speed (A) is within the normal operation speed range (B). If the determination is affirmative, the target of the engine fuel supply device (5) is determined based on the command engine speed (A), the command engine torque, and the fuel supply amount setting data (1f) in step (S2). The fuel supply amount (C) is calculated. In step (S3), the fuel supply limit amount (D) of the engine fuel supply device (5) is calculated based on the command engine speed (A) and the fuel supply limit amount setting data (1c). In step (S4), it is determined whether or not the target fuel supply amount (C) is less than the fuel supply limit amount (D). If the determination is affirmative, the fuel supply amount of the engine fuel supply device (5) is controlled based on the target fuel supply amount (C) in step (S5). If the determination is negative, control is performed to limit the fuel supply amount of the engine fuel supply device (5) to the fuel supply limit amount (D) in step (S6).

  If the determination in step (S1) is negative, it is determined in step (S7) whether or not the engine speed command value (A) is the no-load minimum speed (B1), and the determination is affirmative. In step (S8), the no-load minimum rotational speed (B1) is set as the command engine rotational speed (A), and the fuel supply amount of the engine fuel supply device (5) is controlled in steps (S2) to (S6). Do. If the determination in step (S7) is negative, in step (S9), the no-load maximum speed (B2) is set as the command engine speed (A), and the engine fuel in steps (S2) to (S6) is determined. The fuel supply amount of the supply device (5) is controlled.

The present invention is not limited to the above embodiment.
The present invention is not limited to an agricultural tractor engine control device in which a rotary tillage work device is connected and pulled to a traveling machine body, but an agricultural tractor engine control in which other work devices (plow work device, substitute working device, etc.) are connected and pulled Equipment, engine control device for agricultural work machines such as combines with a harvesting work device or threshing work device mounted on a traveling machine body, engine control device for a construction work device such as a backhoe with a bucket work device connected to the traveling machine body, power generation to the machine body You may apply to the engine control apparatus of the engine generator which mounts a machine. The engine fuel supply device (5) is not limited to the common rail fuel injection device (9), but may be an electronic governor that controls the fuel injection pump and the fuel metering rack position thereof. The communication line is not limited to the CAN communication bus, and may be another communication line.

It is a block diagram of the engine control device of the agricultural tractor which pulled the rotary tillage working device concerning the embodiment of the present invention. It is a figure explaining the data memorize | stored in each memory | storage means of engine ECU and separate ECU of the control apparatus of FIG. 2 is a flowchart illustrating a process of controlling a fuel supply amount by an engine ECU of the control device of FIG. 1.

Explanation of symbols

(1) Engine ECU
(1a) Memory means
(1c) Fuel supply limit amount setting data
(1f) Fuel supply amount setting data
(2) Engine
(3) Working device
(4) Separate ECU
(4a) Memory means
(4c) Engine control command setting data
(5) Engine fuel supply device
(A) Command engine speed
(B) Normal operation rotation range
(B1) No-load minimum speed
(B2) Maximum speed without load
(C) Target fuel supply volume
(D) Fuel supply limit

Claims (3)

An engine control device for a work machine that controls the engine (2) according to the work characteristics of the work device (3) driven by the engine (2).
An engine ECU (1) and a separate ECU (4) that is separate from the engine ECU (1) are linked via a communication line (6).
The storage means (1a) of the engine ECU (1) stores fuel supply amount setting data (1f), and the storage means (4a) of the separate ECU (4) controls according to the work characteristics of the work device (3). The engine control command setting data (4c) of characteristics is stored,
The separate ECU (4) or the engine ECU (1) calculates the command engine speed (A) and the command engine torque based on the engine control command setting data (4c),
The engine ECU (1) calculates the target fuel supply amount (C) of the engine fuel supply device (5) based on the command information and the fuel supply amount setting data (1f), and the engine ECU (1) An engine control device for a working machine, wherein the fuel supply amount of the engine fuel supply device (5) is controlled based on the target fuel supply amount (C). In the engine control device for a work machine according to claim 1,
The storage means (1a) of the engine ECU (1) stores fuel supply limit amount setting data (1c),
The engine ECU (1) calculates the fuel supply limit amount (D) of the engine fuel supply device (5) based on the command engine speed (A) and the fuel supply limit amount setting data (1c).
When the target fuel supply amount (C) is less than the fuel supply limit amount (D), the engine ECU (1) determines the fuel of the engine fuel supply device (5) based on the target fuel supply amount (C). Control the supply amount,
When the target fuel supply amount (C) is equal to or greater than the fuel supply limit amount (D), the engine ECU (1) changes the fuel supply amount of the engine fuel supply device (5) to the fuel supply limit amount (D). An engine control device for a work machine, characterized in that the control is limited. In the engine control device for a work machine according to claim 1 or 2,
The storage means (1a) of the engine ECU (1) stores the no-load minimum speed (B1) and the no-load maximum speed (B2),
When the command engine speed (A) is within the normal operation speed range (B) from the no-load minimum speed (B1) to the no-load maximum speed (B2), the engine ECU (1) Based on the command engine speed (A), the fuel supply amount of the engine fuel supply device (5) is controlled,
When the command engine speed (A) is less than the no-load minimum speed (B1), the engine ECU (1) sets the no-load minimum speed (B1) as the command engine speed (A) and the engine. The fuel supply amount of the fuel supply device (5) is controlled,
When the command engine speed (A) exceeds the no-load maximum speed (B2), the engine ECU (1) sets the no-load maximum speed (B2) as the command engine speed (A) and engine fuel. An engine control device for a working machine, wherein the fuel supply amount of the supply device (5) is controlled.

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