JP4814193B2 - Engine electronic governor - Google Patents

Description

  The present invention relates to an electronic governor for an engine, and more particularly to an electronic governor for an engine that can perform an emergency operation in the event of an abnormality in which a rotation speed detecting means has failed.

  As in the present invention, as an electronic governor of a conventional engine, a rotation speed command means, a rotation speed detection means, and a rotation speed deviation calculation means are provided and detected by the target rotation speed and the rotation speed detection means set by the rotation speed command means. The rotational speed deviation from the actual rotational speed is calculated by the rotational speed deviation calculating means, the position deviation calculating means, the actuator, and the metering position detecting means are provided, and the target metering of the fuel metering unit set by the rotational speed deviation calculating means The position deviation calculation means calculates the adjustment position deviation between the position and the actual adjustment position detected by the adjustment position detection means, and sets the target current value to be supplied to the actuator by the position deviation calculation means based on the adjustment position deviation However, there is an actuator in which the metering position of the fuel metering unit is controlled by an actuator (for example, see Patent Document 1).

  However, the conventional electronic governor of the engine has a problem because the control mode cannot be switched at the time of abnormality in which the rotation speed detecting means fails.

Japanese Unexamined Patent Publication No. 2000-45798 (see FIG. 2)

The above prior art has the following problems.
<Problem> When an abnormality occurs, it is necessary to stop the operation until the failure is recovered.
Since the control mode cannot be switched at the time of abnormality in which the rotation speed detecting means has failed, it is necessary to stop the operation until the failure is recovered at the time of abnormality.

  It is an object of the present invention to provide an engine electronic governor that can solve the above-described problems, that is, an engine electronic governor that can perform emergency operation in an abnormal state in which the rotation speed detection means has failed.

Invention specific matters of the invention according to claim 1 are as follows.
As illustrated in FIG. 1, a rotation speed command means (1), a rotation speed detection means (2), and a rotation speed deviation calculation means (3) are provided, and the target rotation speed set by the rotation speed command means (1) The rotational speed deviation from the actual rotational speed detected by the rotational speed detecting means (2) is calculated by the rotational speed deviation calculating means (3),
Position deviation calculating means (4), actuator (5) and metering position detecting means (7) are provided, and the target metering position and fuel metering position (6) set by the rotational speed deviation calculating means (3) are adjusted. The position deviation calculation means (4) calculates the adjustment position deviation from the actual adjustment position detected by the quantity position detection means (7), and the position deviation calculation means (4) calculates the actuator (5 In the electronic governor of the engine, the target current value to be supplied to) is set, and the metering position of the fuel metering unit (6) is controlled by the actuator (5).
A supercharging pressure detection means (15), an abnormality detection means (8), a rotation speed calculation means (16), a mode switching instruction means (10), and a mode switching means (11) are provided, and a metering position detection means (7). Rotational speed calculation means (16) calculates an estimated rotational speed using the actual adjustment amount position signal (7a) transmitted from the supercharging pressure signal (15a) transmitted from the supercharging pressure detection means (15), and an abnormality is detected. Based on the fact that the means (8) detects the abnormality of the rotational speed detecting means (2), the mode switching instruction means (10) instructs the mode switching means (11) to switch the control mode,
The normal speed control mode in which the actual rotation speed signal (2a) is input from the rotation speed detection means (2) to the rotation speed deviation calculation means (3) is changed from the rotation speed calculation means (16) to the rotation speed deviation calculation means (3). The control is switched to the abnormal time control mode for inputting the estimated rotational speed signal (16a). In the abnormal time control mode, the estimated rotational speed signal (16a) is used as substitute information for the actual rotational speed signal (2a), and the rotational speed deviation calculating means (3) An electronic governor for an engine, characterized in that the rotational speed deviation is calculated by a motor.

(Invention according to Claim 1)
<Effect> Emergency operation can be performed in the event of an abnormality.
As illustrated in FIG. 1, in the abnormal time control mode, the rotational speed deviation is calculated by the rotational speed deviation calculating means (3) using the estimated rotational speed signal (16a) as substitute information for the actual rotational speed signal (2a). Therefore, emergency operation can be performed at the time of abnormality in which the rotation speed detecting means (2) is out of order.

<Effect> It is possible to increase the rotational settling speed during emergency operation.
As illustrated in FIG. 1, since the target current value to be supplied to the actuator (5) is set by the position deviation calculation means (4) based on the metering position deviation even in the abnormal control mode, the metering position information is used. However, compared with the case where control is performed based only on the rotational speed deviation, the rotational settling speed during emergency operation can be increased by the amount that the target metering position can be set.

(Invention according to Claim 2)
In addition to the effect of the invention according to claim 1, the following effect is achieved.
<Effect> It is possible to warn the driver of the necessity of abnormal operation and repair.
As illustrated in FIG. 1, an abnormality warning instruction means (12) and an abnormality warning display means (13) are provided, and based on the fact that the abnormality detection means (8) has detected an abnormality in the rotational speed detection means (2). The abnormality warning instruction means (12) instructs the abnormality warning display means (13) to display the abnormality warning so that the abnormality warning display means (13) displays the abnormality warning. The need for operation and repair can be warned.

  Embodiments of the present invention will be described with reference to the drawings. 1 and 2 are diagrams for explaining an electronic governor for an engine according to an embodiment of the present invention. In this embodiment, an electronic governor for a diesel engine will be described.

The outline of the embodiment of the present invention is as follows.
A rotation speed command means (1), a rotation speed detection means (2), and a rotation speed deviation calculation means (3) are provided, and the target rotation speed and the rotation speed detection means (2) set by the rotation speed command means (1) are provided. A rotational speed deviation from the detected actual rotational speed is calculated by a rotational speed deviation calculating means (3).
Position deviation calculating means (4), actuator (5) and metering position detecting means (7) are provided, and the target metering position and fuel metering position (6) set by the rotational speed deviation calculating means (3) are adjusted. The position deviation calculation means (4) calculates the adjustment position deviation from the actual adjustment position detected by the quantity position detection means (7), and the position deviation calculation means (4) calculates the actuator (5 ) Is set, and the metering position of the fuel metering unit (6) is controlled by the actuator (5).

  The rotation speed command means (1) is a potentiometer that detects the speed control lever and its speed control position, and transmits a target rotation signal (1a) to the rotation speed deviation calculation means (3). The rotation speed detection means (2) is a sensor that detects the rotation speed of the crankshaft, and transmits an actual rotation speed signal (2a) to the rotation speed deviation calculation means (3). In the rotational speed deviation calculating means (3), the target metering position of the fuel metering section (6) is set so that the rotational deviation between the target rotational speed and the actual rotational speed is within the allowable range, and the target metering position signal ( 3a) is transmitted to the position deviation calculating means (4).

  The fuel metering unit (6) is a fuel metering rack of the fuel injection pump (6a). The metering position detecting means (7) is a rack position sensor, and transmits an actual metering position signal (7a) to the position deviation calculating means (4) via a mode switching means (11) described later. In the position deviation calculation means (4), an actuator target current value to be supplied to the actuator (5) is set so that the adjustment position deviation between the target adjustment position and the actual adjustment position falls within the allowable range, and the actuator target current value is set. A signal (4a) is transmitted to the current deviation calculating means (14). Further, the actuator actual current value of the actuator (5) is detected by the current value detecting means (9), and the actuator actual current value signal (9a) is transmitted to the current deviation calculating means (14).

  The current deviation calculation means (14) adjusts the control gain so that the current value deviation between the actuator target current value and the actuator actual current value falls within the allowable range. The actuator (5) is a linear electromagnetic solenoid, and an output substantially proportional to the current value is obtained. The fuel metering rack, which is the fuel metering unit (6), is biased in the fuel increasing direction by the biasing spring (6b). The biasing force (6c) of the biasing spring (6b) and the output of the actuator (5) The fuel metering rack moves by metering due to the unbalanced force of the rod (5a) with the projecting output (5b).

The device of this electronic governor is as follows.
As shown in FIG. 1, a supercharging pressure detection means (15), an abnormality detection means (8), a rotation speed calculation means (16), a mode switching instruction means (10) and a mode switching means (11) are provided. The rotational speed calculation means (16) estimates the rotation based on the actual adjustment amount position signal (7a) transmitted from the quantity position detection means (7) and the boost pressure signal (15a) transmitted from the boost pressure detection means (15). Based on the fact that the abnormality detection means (8) has detected an abnormality in the rotation speed detection means (2) from the actual rotation speed signal (2a) and the boost pressure signal (15a), the mode switching instruction means ( 10) instructs the mode switching means (11) to switch the control mode.
Thus, the normal time control mode in which the actual rotational speed signal (2a) is input from the rotational speed detecting means (2) to the rotational speed deviation calculating means (3) is changed from the rotational speed calculating means (16) to the rotational speed deviation calculating means ( 3) Switch to the abnormal control mode in which the estimated rotational speed signal (16a) is input to 3). In the abnormal control mode, the rotational speed deviation calculating means uses the estimated rotational speed signal (16a) as substitute information for the actual rotational speed signal (2a). Calculate the rotation speed deviation in (3).

  As shown in FIG. 1, an abnormality warning instruction means (12) and an abnormality warning display means (13) are provided. Based on the fact that the abnormality detection means (8) has detected an abnormality in the rotational speed detection means (2), When the abnormality warning instruction means (12) instructs the abnormality warning display means (13) to display the abnormality warning, the abnormality warning display means (13) causes the abnormality warning display to be performed.

Specific configurations and functions are as follows.
The abnormality detection means (8) receives the actual adjustment amount position signal (7a) from the adjustment position detection means (7) and the supercharging pressure signal (15a) from the supercharging pressure detection means (15). In the abnormality detection means (8), an abnormality is detected based on the actual rotational speed signal (2a) and the boost pressure signal (15a). When an abnormality is detected, the abnormality detection means (8) switches the mode switching instruction means (10). The abnormality detection signal (8a) is transmitted to the abnormality warning instruction means (12). Upon receipt of the abnormality detection signal (8a), the mode switching instruction means (10) transmits an abnormal mode switching instruction signal (10a) to the mode switching means (11), and the mode switching means (11) is in the normal control mode. Is switched to the control mode when an error occurs. Upon receiving the abnormality detection signal (8a), the abnormality warning instruction means (12) transmits an abnormality warning instruction signal (12a) to the abnormality warning instruction means (13). The abnormality warning instruction means (13) is a warning lamp. When the abnormality warning instruction signal (12a) is received, the abnormality warning instruction means (13) is turned on to give an abnormality warning.

  Rotational speed deviation calculation means (3), position deviation calculation means (4), abnormality detection means (8), mode switching instruction means (10), mode switching means (11), abnormality warning instruction means (12), current deviation calculation The means (14) and the rotational speed calculation means (16) are both means realized by the function of the ECU (engine control unit).

The abnormal time processing by the ECU is as follows.
In step (S1), it is determined whether the engine speed is less than the idling engine speed N. If the determination is affirmative, it is determined in step (S2) whether the supercharging pressure exceeds the atmospheric pressure P, If the determination is affirmative, an abnormality is detected in step (S3) that the rotation speed detection means (2) is out of order, the mode is switched to an abnormal mode in step (S4), and an abnormality is detected in step (S5). A warning is displayed. Even when the actual engine speed signal (2a) is not transmitted during engine operation, an abnormality is detected that the engine speed detection means (2) is out of order.

It is a functional block diagram of the electronic governor of the engine which concerns on embodiment of this invention. It is a process flowchart at the time of abnormality of the electronic governor of the engine which concerns on embodiment of this invention.

Explanation of symbols

(1) Speed command means
(2) Speed detection means
(3) Speed deviation calculation means
(4) Position deviation calculation means
(5) Actuator
(6) Fuel metering section
(7) Metering position detection means
(7a) Actual adjustment position signal
(8) Abnormality detection means
(10) Mode switching instruction means
(11) Mode switching means
(12) Abnormal warning instruction means
(13) Abnormal warning display means

Claims (2)

A rotation speed command means (1), a rotation speed detection means (2), and a rotation speed deviation calculation means (3) are provided, and the target rotation speed and the rotation speed detection means (2) set by the rotation speed command means (1) are provided. The rotational speed deviation with the detected actual rotational speed is calculated by the rotational speed deviation calculating means (3),
Position deviation calculating means (4), actuator (5) and metering position detecting means (7) are provided, and the target metering position and fuel metering position (6) set by the rotational speed deviation calculating means (3) are adjusted. The position deviation calculation means (4) calculates the adjustment position deviation from the actual adjustment position detected by the quantity position detection means (7), and the position deviation calculation means (4) calculates the actuator (5 In the electronic governor of the engine, the target current value to be supplied to) is set, and the metering position of the fuel metering unit (6) is controlled by the actuator (5).
A supercharging pressure detection means (15), an abnormality detection means (8), a rotation speed calculation means (16), a mode switching instruction means (10), and a mode switching means (11) are provided, and a metering position detection means (7). Rotational speed calculation means (16) calculates an estimated rotational speed using the actual adjustment amount position signal (7a) transmitted from the supercharging pressure signal (15a) transmitted from the supercharging pressure detection means (15), and an abnormality is detected. Based on the fact that the means (8) detects the abnormality of the rotational speed detecting means (2), the mode switching instruction means (10) instructs the mode switching means (11) to switch the control mode,
The normal speed control mode in which the actual rotation speed signal (2a) is input from the rotation speed detection means (2) to the rotation speed deviation calculation means (3) is changed from the rotation speed calculation means (16) to the rotation speed deviation calculation means (3). The control is switched to the abnormal time control mode for inputting the estimated rotational speed signal (16a). In the abnormal time control mode, the estimated rotational speed signal (16a) is used as substitute information for the actual rotational speed signal (2a), and the rotational speed deviation calculating means (3) An electronic governor for an engine, characterized in that the rotational speed deviation is calculated by a motor. The electronic governor of the engine according to claim 1 ,
An abnormality warning instruction means (12) and an abnormality warning display means (13) are provided. Based on the fact that the abnormality detection means (8) has detected an abnormality in the rotational speed detection means (2), the abnormality warning instruction means (12) An engine electronic governor, wherein the abnormality warning display means (13) causes the abnormality warning display means (13) to display the abnormality warning display by instructing the abnormality warning display means (13).

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