JP2002089309A - Speed governing device for engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent adverse effect such as seizure of a piston and a cylinder, by reducing engine temperature before engine stop. SOLUTION: This speed governing device for an engine comprises an engine stop means 26, and the engine stop means 26 comprises a temperature detecting means 27 and a control means 16. The temperature detecting means 27 detects at least one of a cooling water temperature and a lubricating oil temperature. When the temperature detecting means 27 detects a temperature exceeding a predetermined temperature, the control means 16 reduces an engine speed, and after a predetermined time has elapsed, the control means 16 stops the engine.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a speed control device for an engine.

[0002]

2. Description of the Related Art Conventionally, in an engine speed governor, the engine is stopped only based on a manual operation.

[0003]

After the engine is shipped, the output limit may be changed at the customer site in order to correspond to the machine to be mounted. In this case, the engine is used in a range outside the guaranteed range at the time of shipment of the engine, and the engine temperature may rise abnormally. In addition, the engine temperature may rise abnormally due to long-time improper use under overload. However, in the conventional speed governor, the engine stop
Since the operation is performed only based on the manual operation, the engine may be stopped while the engine temperature is abnormally increased. In this case, since the circulation of the cooling fan and the engine cooling water is stopped, there is a possibility that an adverse effect such as burning of the piston or the cylinder may occur.

[0004] It is an object of the present invention to provide a speed control device for an engine which can solve the above problems.

[0005]

(Invention of claim 1) FIGS.
As shown in FIG. 3, an engine stopping means (26) is provided. The engine stopping means (26) includes a temperature detecting means (27) and a control means (16), and the temperature detecting means (27) If at least one of the water temperature and the lubricating oil temperature is detected, and the temperature detection means (27) detects a temperature exceeding a predetermined temperature, the control means (16) lowers the engine speed,
An engine speed control device for stopping an engine after a predetermined time has elapsed.

According to a second aspect of the present invention, in the speed control device for an engine according to the first aspect, as shown in FIGS. 1 to 3, a speed control operating means (1) and a speed control setting means (4) are provided. , A mechanical governor (2) and a fuel metering section (3);
(1) The fuel control section (3) is interlockingly connected to the fuel control section (3) via the control section (4) and the mechanical governor (2) in order.
(1) is a three-stage switching type of high speed, medium speed and low speed, and the speed control setting means (4) includes a pair of actuators (5) and (6) and a link mechanism (7). 5) and (6) are two-position switching type, and the link mechanism (7) is attached to each output part (8) and (9) of the pair of actuators (5) and (6), and as shown in FIG. When the speed adjusting operation means (1) is operated to the high-speed switching position, the output portions (8) and (9) of the actuators (5) and (6) take the first switching posture (8-1) (9-1), respectively. As a result, the governing lever (10) of the mechanical governor (2) is set to the high-speed switching position via the link mechanism (7), and as shown in FIG. , The output section (8) of one actuator (5) takes the second switching posture (8-2) and the output section of the other actuator (6).
(9) takes the first switching posture (9-1), so that the speed governing lever of the mechanical governor (2) is connected via the link mechanism (7).
(10) is set to the middle speed switching position, and as shown in FIG.
When the speed adjusting operation means (1) is operated to the low-speed switching position, the output portions (8) and (9) of the actuators (5) and (6) take the second switching postures (8-2) and (9-2), respectively. By the link mechanism
Speed control lever (10) of mechanical governor (2) through (7)
Is set to the low-speed switching position, and when the temperature detecting means (27) detects a temperature exceeding the predetermined temperature, even if the speed control operating means (1) is at the high-speed switching position. The control means (16) operates the speed control setting means (4) to switch the speed control lever (10) of the mechanical governor (2) to the medium speed switching position, and after a predetermined time has elapsed, the mechanical governor (2) is operated. ) Is switched to the low-speed switching position, and after a predetermined time has elapsed, the engine is stopped.

[0007]

Operation and Effect of the Invention (Invention of claim 1) The invention of claim 1 has the following operation and effects. If the engine temperature rises abnormally due to a change in the engine output limit or improper use for a long time due to overload, the control means (16)
After lowering the engine speed and allowing a predetermined time to elapse,
Since the engine is stopped, the engine temperature can be reduced before the engine is stopped. Therefore, adverse effects such as seizure of the piston and the cylinder can be prevented.

(Invention of claim 2) The invention of claim 2 has the following effect in addition to the effect of the invention of claim 1. As shown in FIG. 1 to FIG. 3, the speed adjusting setting means (4) sets the speed adjusting position of the mechanical governor (2) in accordance with the speed adjusting switching operation of the speed adjusting operating means (1). Man lift etc.
It can be mounted on machines that require three-stage speed control. Therefore, after the engine is shipped, there is no possibility that the mechanical governor (2) is removed for mounting on such a machine and the electronic governor is modified to the electronic governor specification. For this reason, use within the guaranteed output range of the engine determined based on the mechanical governor specifications is maintained, and the durability and exhaust gas characteristics of the engine are properly maintained. Also, a pair of two-position switching type actuators (5) and (6) and a link mechanism (7)
As a result, three-stage switching can be performed, so that the device can be manufactured at low cost. Then, the forced medium-speed operation and the low-speed operation before the engine is stopped can be performed by using the speed adjustment setting means (4), so that a dedicated device for the forced operation becomes unnecessary.

[0009]

Embodiments of the present invention will be described with reference to the drawings. FIG. 1 to FIG. 3 are views for explaining an embodiment of the present invention. This embodiment is a speed control device for a gasoline engine.

The outline of the structure of the engine speed control device is as follows.
It is as follows. As shown in FIG. 1, this device comprises a speed control means (1), a mechanical governor (2), a fuel metering unit.
(3) and engine stopping means (26). The speed control means (1) is a speed control lever. This may be of the switch type. Mechanical governor (2)
Is a centrifugal governor. The fuel metering section (3) is a carburetor throttle valve. In the case of a diesel engine, this is a metering rack for the fuel injection pump. The engine stopping means (26) will be described later. In the drawing, reference numeral (22) indicates a choke valve, (23) indicates a venturi,
(24) is a fuel nozzle.

The details of the configuration of this device are as follows. The speed control operating means (1) is a speed control switching type having a plurality of discontinuous stages, specifically, a three-speed switching type of high speed, medium speed, and low speed. The mechanical governor (2) has a governing lever (10),
The governor includes a governor spring (11), governor force generating means (12), and a governor lever (13). The governor lever (1) is connected to the governor lever (10) via a governor spring (11).
3) is linked. The governor force generating means (12)
The flyweight rotates at a speed proportional to the engine speed, and faces the governor lever (13). The governor lever (13) is interlocked with a fuel metering section (3) via an interlock rod (14). This mechanical governor
In (2), the governor spring force of the governor spring (11) is based on the governing position set by the governing lever (10).
(11a) is adjusted, and the governor lever (13) is imbalanced by the governor spring force (11a) and the governor force (12a).
And the fuel metering unit is moved via the interlocking rod (14).
(3) is metered.

Speed control means (1) and mechanical governor (2)
Between them, a speed control setting means (4) is provided. The speed control setting means (4) sets the speed control position of the mechanical governor (2) in response to the speed control switching operation of the speed control operation means (1). The speed control setting means (4) includes a set speed detecting means (15), a control means (16), a pair of actuators (5) and (6), a link mechanism (7), and an interlocking rod (17). The set speed detecting means (15) detects a speed change switching position of the speed adjusting operation means (1) and sends a set speed detection signal to the control means (16).
The control means (16) is a microcomputer, and based on a set speed detection signal, a pair of actuators (5)
The operation of (6) is controlled.

The pair of actuators (5) and (6) are linear solenoids. The first switching postures (8-1) and (9-1) with the output units (8) and (9) retracted, and the output unit (8). ) And (9) are switched to the second switching posture (8-2) (9-2). The link mechanism (7) is attached to each output section (8) (9) of the pair of actuators (5) (6). The link mechanism (7) includes a pair of base arms (18) and (19).
, A relay arm (20), and a distal arm (21). One end of each of the pair of base arms (18) and (19) is pivotally supported by the distal end of each of the output sections (8) and (9). Relay arm
(20) is provided between the distal ends of the pair of base arms (18) and (19), and both ends are pivotally supported by the distal ends of the base arms (18) and (19). The base end of the distal arm (21) is pivotally supported at the center of the relay arm (20). A speed control lever (10) of a mechanical governor (2) is operatively connected to a distal end of the distal arm (20) via an interlocking rod (17). Reference numeral (25) in the drawing is a stopper pin.

The function of this speed control device is as follows.
As shown in FIG. 1, when the speed adjusting operation means (1) is operated to the high-speed switching position, the output section (8) of each actuator (5) (6) is operated.
(9) takes the first switching postures (8-1) and (9-1), respectively, so that the mechanical governor can be moved through the link mechanism (7).
The speed control lever (10) of (2) is set to the high-speed switching position.
As shown in FIG. 2, when the speed adjusting operation means (1) is operated to the medium speed switching position, the output portion (8) of one actuator (5) takes the second switching posture (8-2) and the other actuator (5) takes the second switching posture (8-2). When the output unit (9) of the actuator (6) takes the first switching posture (9-1),
The speed control lever (10) of the mechanical governor (2) is set to the middle speed switching position via the link mechanism (7). As shown in FIG. 3, when the speed control means (1) is operated to the low-speed switching position,
The output sections (8) and (9) of the actuators (5) and (6) take the second switching postures (8-2) and (9-2), respectively, so that the mechanical governor (2) is connected via the link mechanism (7). ) Governing lever
(10) is set to the low speed switching position.

The engine stopping means (26) is a temperature detecting means.
(27) and control means (16). Temperature detection means
(27) detects the cooling water temperature. This may detect the lubricating oil temperature. The control means (16) uses the one described above. In this engine stop device, when the temperature detecting means (27) detects a temperature exceeding a predetermined temperature, the control means (16) is controlled by the control means (16) even when the speed adjusting operation means (1) is at the high-speed switching position. Speed control setting means (4)
To operate the speed governing lever (10) of the mechanical governor (2).
Is switched to the medium-speed switching position, and after a predetermined time has elapsed, the governing lever (10) of the mechanical governor (2) is switched to the low-speed switching position, and after the predetermined time has elapsed, the engine is stopped. An ignition plug (29) is connected to the control means (16) via an igniter (28).
By stopping the spark, the engine can be stopped.

The processing function of the control means (16) is as follows. As shown in FIG. 4, in step S1, it is determined whether or not the cooling water temperature exceeds a predetermined temperature. If the determination is affirmative, the process proceeds to step S2. In step S2, even when the speed control operating means (1) is at the high-speed switching position, the speed control setting means (4) is operated and the mechanical governor is operated.
The governing lever (10) of (2) is switched to the medium speed switching position.
After the end of step S2, the process proceeds to step S3. In step S3, a predetermined time is waited while the engine speed is maintained at the medium speed. During this time, the engine temperature decreases. When the predetermined time has elapsed in step S3, the process proceeds to step S4. In step S4, the speed control setting means (4) is operated,
The speed governing lever (10) of the mechanical governor (2) is switched to the low speed switching position. After the end of step S4, step S4
Go to 5. In step S5, a predetermined time is waited while maintaining the engine rotation speed at a low speed. When the predetermined time has elapsed in step S5, the process proceeds to step S6. Step S6
Then stop the engine.

[Brief description of the drawings]

FIG. 1 is a schematic diagram of an engine speed control device according to an embodiment of the present invention, in which a speed control device is set to a high-speed switching position.

FIG. 2 is a diagram in a case where the speed adjusting operation means is set to a middle speed switching position in the apparatus of FIG. 1;

FIG. 3 is a diagram when the speed adjusting operation means is set to a high-speed switching position in the apparatus of FIG. 1;

FIG. 4 is a flowchart showing a processing function of a control unit of the apparatus of FIG.

[Explanation of symbols]

(1) ... governing operation means, (2) ... mechanical governor, (3) ...
Fuel metering unit, (4) Speed control setting means, (5) Actuator, (6) Actuator, (7) Link mechanism, (8)
(5) output section, (8-1) first switching attitude, (8-2) second switching attitude, (9) output section (6), (9-1) first switching attitude , (9-2): second switching posture, (10): governing lever,
(26) ... engine stop means, (27) ... temperature detection means.

Continued on the front page (51) Int.Cl. ⁷ Identification code FI Theme coat II (reference) F02D 11/04 F02D 11/04 B F term (reference) 3G060 AB01 AC01 AC08 BA02 BA03 CA01 CB09 CC02 DA05 FA06 GA07 3G065 CA00 CA01 DA07 DA09 EA06 FA04 GA07 GA09 GA10 GA46 JA02 JA09 JA11 KA12 3G092 AA01 BA03 BA10 CA01 CB04 DG01 DG09 DG10 EA02 EA17 EB05 EC09 FA30 FA38 GA10 HE01Z HE08Z HF08Z

Claims (2)

[Claims] An engine stopping means (26) includes a temperature detecting means (27) and a control means (16), and the temperature detecting means (27) includes a cooling water temperature. And if at least one of the lubricating oil temperature is detected and the temperature detecting means (27) detects a temperature exceeding the predetermined temperature, the control means (16) lowers the engine rotation speed and after elapse of a predetermined time, And an engine speed control device for stopping the engine. 2. The speed control device for an engine according to claim 1, wherein the speed control means (1), the speed control setting means (4), the mechanical governor (2), and the fuel control section (3). And speed control means
(1) The fuel control section (3) is interlockingly connected to the speed control setting means (4) and the mechanical governor (2) in order, and the speed control operation means (1) includes high speed, medium speed, and low speed. The speed control setting means (4) includes a pair of actuators (5) (6) and a link mechanism (7), and each actuator (5) (6)
Is a two-position switching type, and a link mechanism (7) is attached to each of the output portions (8) and (9) of the pair of actuators (5) and (6). When operated, the output portions (8) and (9) of the actuators (5) and (6) take the first switching postures (8-1) and (9-1), respectively.
Speed control lever (10) of mechanical governor (2) through (7)
Is set to the high-speed switching position, and when the governing means (1) is operated to the medium-speed switching position, the output section (8) of one of the actuators (5) causes the second switching posture (8-2).
When the output unit (9) of the other actuator (6) takes the first switching posture (9-1), the speed control lever (10) of the mechanical governor (2) is connected via the link mechanism (7). Is set to the medium-speed switching position, and when the speed-control operating means (1) is operated to the low-speed switching position, the output units (8) and (9) of the actuators (5) and (6) respectively change the second switching posture (8- 2) By taking (9-2), the link mechanism
Speed control lever (10) of mechanical governor (2) through (7)
Is set to the low-speed switching position, and when the temperature detecting means (27) detects a temperature exceeding the predetermined temperature, even when the speed-control operating means (1) is at the high-speed switching position, The control means (16) operates the speed control setting means (4) to switch the speed control lever (10) of the mechanical governor (2) to the medium speed switching position, and after a predetermined time has elapsed, the mechanical governor (2) is operated. (G) the speed control lever (10) is switched to the low-speed switching position, and after a predetermined time has elapsed, the engine is stopped.