JP2001073847A - Idling control device of internal-combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow an operator to change the idling speed without providing any changeover switch while the idling operation is in automatic control. SOLUTION: A setting device 6 emits a setting signal S1 for setting the control characteristic of the idling speed, and the target engine speed TN of the idling speed of the cooling water temperature of a Diesel engine 3 is set on the basis of the setting signal S1 and water temperature signal S2. Thereby the idling speed can be changed into the desired value without using any particular changeover switch from the setting device 6 even while the idling operation is in automatic control.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an idle operation control apparatus for an internal combustion engine, which can automatically control the idle operation of the internal combustion engine and can change the idle operation control characteristics by an operator.

[0002]

2. Description of the Related Art In general, it is preferable to set the idle speed of an internal combustion engine to be as low as possible within a range where stable rotation can be obtained. However, the optimum idle speed is determined according to the respective operating conditions. Things. Therefore, this type of conventional idle operation control device sets a target idle rotation speed according to, for example, a cooling water temperature in advance, and automatically performs the idle operation of the internal combustion engine according to the predetermined idle operation control characteristics. Configuration. According to this configuration, the idle speed gradually decreases in accordance with the rise of the cooling water temperature, and the idle operation ends. However, in actuality, there is a request to end the idle operation sooner or the heating when the vehicle stops is stopped. In order to meet various demands for raising the temperature, it is desired that the driver can manually adjust the engine speed during idling operation.

[0003] In order to satisfy such demands, for example, Japanese Patent Publication No. 4-51658 discloses an electronic engine control system for electronically controlling the amount of fuel supplied to an engine. An open / close switch with a volume is provided, and the switch of this volume is switched between auto idle and manual idle.At the time of auto idle, the amount of fuel supplied to the engine is controlled according to the coolant temperature,
There is disclosed an idling control device configured to control a fuel supply amount according to a signal voltage from a volume during manual idle.

[0004]

However, this prior art uses a switch-equipped volume provided with an open / close switch for switching idle operation between automatic and manual operation, and pulls or pushes the shaft of the switch-equipped volume. Open and close the switch to switch between auto and manual, and rotate the volume shaft to set the idle speed during manual control, so the manual speed during idle operation of the internal combustion engine is set. However, there is a problem that an expensive switch-equipped volume must be used as an operation member for setting the volume.

Further, according to this prior art, when switching between manual and automatic, the level of the control signal becomes discontinuous, so that the idle speed of the internal combustion engine also varies discontinuously. Another problem is that the feeling is poor.

[0006] It is therefore an object of the present invention to provide a driver's will without having to provide a special changeover switch and without causing a discontinuity in the idling speed of the internal combustion engine during automatic control of the idling operation of the internal combustion engine. It is an object of the present invention to provide an internal combustion engine idle operation control device which can be changed by the following.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, a feature of the present invention is to control the idling speed of the internal combustion engine by adjusting the fuel supplied from the fuel injection device to the internal combustion engine. In the idle operation control device for the internal combustion engine, a water temperature sensor for detecting the temperature of the cooling water of the internal combustion engine, and a setter that outputs a setting signal for setting a control characteristic of the idle speed of the internal combustion engine, ,
Calculating a target rotation speed value of the idle rotation speed with respect to the water temperature at that time according to a target rotation speed value characteristic of the idle rotation speed with respect to the water temperature determined in accordance with the setting signal in response to the water temperature sensor and the setting device; A target value calculation unit, wherein the supplied fuel is adjusted so as to obtain the target rotation speed value in response to an output from the target value calculation unit.

The target value calculation section performs a map calculation in response to the output signal from the water temperature sensor and the setting signal, and calculates a target value of the idle speed according to the coolant temperature at that time and the setting signal. It can be configured.

According to this configuration, by changing the control characteristic of the idle operation by the setting device during the automatic control of the idle operation, the target rotation speed value of the idle rotation speed is changed according to the driver's will, and the idle speed is changed. The rotation speed can be smoothly changed with continuity.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of an idle operation control device for an internal combustion engine according to the present invention. The idle operation control device 1 is a device for controlling the idle operation of the diesel engine 3 that receives the fuel injection supply from the fuel injection pump 2, and includes a control unit 4.

The control unit 4 receives a water temperature signal S1 indicating the temperature of the cooling water of the diesel engine 3 from the water temperature sensor 5 and a setting signal S2 for setting control characteristics for controlling the idling operation. It is input from the setting device 6.

The setter 6 is composed of a variable resistor, a DC voltage + V is applied to one fixed terminal 6a, the other fixed terminal 6b is grounded, and the rotational position which is an operation amount of the sliding terminal 6c is set. The configuration is such that a setting signal S2 whose level L changes as shown in FIG. 2 according to θ is output from the sliding terminal 6C.

In FIG. 1, reference numeral 7 designates an actuator for operating the fuel adjusting member 2A of the fuel injection pump 2. The actuator 7 controls the control output from the control unit 4 as described later. The positioning operation of the fuel adjustment member 2A is performed according to the signal S3, and the supply fuel supplied from the fuel injection pump 2 to the diesel engine 3 can be adjusted. Reference numeral 8 denotes a known rotational speed sensor for detecting the rotational speed of the diesel engine 3. The rotational speed sensor 8 outputs a rotational speed signal S4 indicating the rotational speed of the diesel engine 3 at that time.
Is output, and the rotation speed signal S4 is input to the control unit 4 as a rotation speed feedback signal.

FIG. 3 shows a detailed block diagram of the control unit 4. The water temperature signal S1 and the setting signal S2 are input to a target value calculation unit 41, where a target rotation speed value TN of an idle rotation speed according to the idle operation control characteristic shown in FIG. The speed signal S5 is output.

The idle operation control characteristics shown in FIG.
The rotation speed limiting characteristic N on the high water temperature side according to the setting signal S2.
1, N2, N3,..., Nn are set substantially steplessly, and are for determining a target rotation speed value TN with respect to the temperature Tw of the cooling water. In this example, when the level L of the setting signal S2 is zero, the rotation speed limiting characteristic is N1, and when the level L of the setting signal S2 reaches its maximum value Lm, the rotation speed limiting characteristic becomes Nn.
When the level L of the setting signal S2 takes an intermediate value between these values, the rotation speed limiting characteristic is set according to the level value. That is, the configuration is such that the rotational speed limiting characteristic can be appropriately set as described above by operating the setting device 6 by the driver.

Therefore, if L = 0, the target rotation speed value TN decreases in accordance with the basic characteristic P as the temperature Tw increases, and the idle rotation speed on the high water temperature side is limited by the rotation speed limiting characteristic N1, and the diesel engine speed is reduced. The idle operation of the engine 3 can be automatically performed. As can be seen from the above description, the rotation speed limiting characteristic N1 used when L = 0 is a part of the basic characteristic P.

In this case, when there is a request to end the idling operation early or to increase the heating temperature when the vehicle is stopped during the idling operation control, the setting unit 6 is adjusted to adjust the level L of the setting signal S2. Is increased, the target rotation speed value T on the high water temperature side is set in accordance with the value of the level L.
The value of N can be increased, and the idling operation can be ended early, or the heating temperature when the vehicle is stopped can be increased.

In this case, since the adjustment of the level L by the setting device 6 is performed continuously, the change from the rotation speed limiting characteristic N1 to the rotation speed limiting characteristic Nn can be performed substantially steplessly. The idle rotation speed of the diesel engine 3 does not change discontinuously due to the operation of the unit 6, and the feeling does not deteriorate.

Returning to FIG. 3, the target value calculator 41 is configured as a three-dimensional map calculator to perform the above-described function of calculating the target rotational speed TN, and responds to the water temperature sensor 5 and the setter 6. The target rotation speed value TN of the idle rotation speed with respect to the water temperature Tw at that time can be calculated according to the target rotation speed value characteristic of the idle rotation speed with respect to the water temperature determined according to the setting signal S2 (FIG. 4).

In this embodiment, the target value calculation unit 4
Although 1 is configured as a three-dimensional map calculator to perform the function of calculating the target rotation speed value TN described above, the present invention is not limited to configuring the target value calculator 41 as a three-dimensional map calculator. For example, the target value calculation unit 41 first performs a map calculation according to the basic characteristic P using a two-dimensional map calculator, and then calculates another target rotation speed value TN in consideration of the rotation speed restriction characteristic according to the setting signal S2. It is also possible to adopt a configuration in which calculation is performed by a device. Alternatively, the target value calculation unit 41 responds to the water temperature sensor 5 and the setting device 6 using a neural network and responds to the target rotation speed value characteristic of the idle rotation speed with respect to the water temperature determined according to the setting signal S2 (FIG. 4). A configuration in which the target rotation speed value TN of the idle rotation speed with respect to the water temperature Tw may be calculated.

The target speed signal S5 is added with the polarity shown in the adder 42 to which the rotation speed signal S4 is input, and the error signal S6 obtained by this is added to the PID calculation unit 4.
3 is input. In the PID calculation unit 43, a calculation process required for performing the PID control is performed on the error signal S6, and a signal obtained as a result of the calculation is applied to the actuator 7 as a control signal S3. Actuator 7
Is driven in response to the control signal S3, and the fuel adjusting member 2A
Is adjusted, the result of the adjustment is fed back to the control unit 4 as a change in the rotation speed signal S4 indicating the rotation speed of the diesel engine 3, and the rotation speed of the diesel engine 3 during idling is set to the target rotation speed value TN. The position control of the fuel adjusting member 2A is performed by closed loop control so as to match

Since the idle operation control device 1 is configured as described above, if the setter 6 is adjusted and the level L of the set signal S2 is set to zero, the idle operation control characteristic is changed to the cooling water of the diesel engine 3. As the temperature rises, the target rotation speed value TN decreases according to the basic characteristic P in FIG.
Thereby, the idle operation of the diesel engine 3 can be automatically controlled.

If the idling speed is to be increased during idling operation for some reason, the level L of the setting signal S2 is increased by operating the setter 6,
The rotational speed limiting characteristic N1 can be translated to increase the idle rotational speed at that time with continuity, thereby achieving a desired idle control characteristic.
That is, without the need for a special changeover switch,
In addition, the target rotation speed value can be changed by changing the control characteristics of the idle rotation speed without causing discontinuity in the idle rotation speed.

FIG. 4 shows an example of the idle operation control characteristic for the target rotation speed value TN calculated by the target value calculation section 41. The idle operation control characteristic for the calculation by the target value calculation section 41 is shown. Is not limited to the idle operation control characteristics shown in FIG. The target rotation speed value characteristic with respect to the water temperature determined according to the setting signal S2 can be set to an appropriate characteristic other than that shown in FIG. 4 according to the specification at that time.

FIGS. 5A, 5B, and 5C illustratively show other examples of idle operation control characteristics. The characteristic of FIG. 5A is such that the inclination of the characteristic Pa in the inclined part of the basic characteristic P is changed according to the level L of the setting signal S2.

The characteristic shown in FIG. 5B is such that the characteristic Pa of the slope portion of the basic characteristic P is changed so as to be translated in accordance with the level L of the setting signal S2 as shown in the figure.

The characteristic shown in FIG. 5C is a modified example of the characteristic shown in FIG. 4. In addition to the rotational speed limiting characteristics N1 to Nn, the target rotational speed TN is increased even at a lower temperature side of the water temperature Tw. The high rotation characteristic Nh that can be set can be set according to the level L of the setting signal S2.

That is, in the idle operation control characteristic shown in FIG. 4, at least the rotation speed limiting characteristic on the high water temperature side is set according to the setting signal S2, but the idle operation control characteristic shown in FIG. The control characteristic is different from the idle operation control characteristic of FIG. 4 in that the control characteristic is an idle operation control characteristic that can increase the rotation speed not only on the high water temperature side but also on the low water temperature side by adjusting the setting device 6.

The control unit 4 shown in FIG. 1 can execute a control operation equivalent to the operation of the configuration shown in FIG. 3 by using a microcomputer to execute a required control program. It is.

FIG. 6 is a flowchart showing an example of such a control program. In step 51, first, a data input process of inputting the water temperature signal S1, the setting signal S2, and the rotation speed signal S4 as data in the computer is performed. Of these input data,
Based on the water temperature signal S1 and the setting signal S2, a target rotation speed value TN suitable for the operating condition at that time is calculated in step 52. In this calculation, map calculation data corresponding to the control characteristics shown in FIG. 4 is stored in a memory in advance, and a three-dimensional map calculation based on this can be performed. In this case, it goes without saying that the map operation data may be data corresponding to the characteristics shown in FIGS. 5A, 5B, and 5C.

Next, in step 53, step 5
2, the target rotation speed value TN and the position signal S4
ΔN (= T)
N-NA) is calculated.

Thereafter, at step 54, the difference ΔN
, A PID calculation process for performing a calculation process required for PID control is performed, and a control signal S3 is output based on the result (step 55), and the process returns to the first step 51 again.

[0034]

According to the present invention, as described above, the target rotation speed characteristic of the idle rotation speed with respect to the cooling water temperature of the internal combustion engine can be determined by the setting signal from the setting device. It is possible to make a change such as increasing the idling rotational speed during the idling operation control without providing any means, and it is possible to obtain an effect that the cost can be reduced as compared with the related art. In addition, since the idle operation characteristic can be set by a setting signal from the setting device, unlike the conventional configuration in which the control mode is switched using a switch or the like, the idle operation characteristic is changed with substantially continuity. It can be configured as follows.
Therefore, the idling speed can be changed with continuity, and the idling speed of the internal combustion engine can be prevented from becoming discontinuous, which is useful for improving the riding feeling. .

[Brief description of the drawings]

FIG. 1 is a block diagram showing an example of an embodiment of an idle operation control device according to the present invention.

FIG. 2 is a characteristic diagram showing characteristics of a setting signal from a setting device shown in FIG. 1;

FIG. 3 is a detailed block diagram of a control unit shown in FIG. 1;

FIG. 4 is a characteristic diagram showing a relationship between a temperature of a cooling water used for calculation in a target value calculation unit shown in FIG. 3 and a target rotation speed value.

FIG. 5 is a characteristic diagram showing a modified example of the characteristic shown in FIG.

FIG. 6 is a flowchart showing an example of a control program for realizing a control function equivalent to that of the control unit shown in FIG. 1 using a microcomputer.

[Explanation of symbols]

 Reference Signs List 1 idling operation control device 2 fuel injection pump 2A fuel adjusting member 3 diesel engine 4 control unit 5 water temperature sensor 6 setter 7 actuator 8 rotation speed sensor 41 target value calculation unit S1 water temperature signal S2 setting signal S3 control signal S4 rotation speed signal

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Kenji Arai 3-13-26, Yayumicho, Higashimatsuyama-shi, Saitama Prefecture Inside of Zexel Higashimatsuyama Plant (72) Inventor Kiyoshi Watanabe 3--13, Yayumicho, Higashimatsuyama-shi, Saitama No. 26 Inside Zexel Higashi-Matsuyama Plant (72) Inventor Hidekazu Oshizawa 3-13-26 Yaumicho, Higashimatsuyama-shi, Saitama Prefecture Inside F-Term of Zexel Higashi-Matsuyama Plant 3G301 HA02 JA04 KA07 LB11 MA11 NA03 NA04 NA05 NA05 NA06 NB02 NB06 NC02 ND02 NE17 NE19 PE01A PE01Z PE08Z

Claims (1)

[Claims] 1. An idle operation control device for an internal combustion engine, wherein the supply of fuel supplied to the internal combustion engine from a fuel injection device is adjusted to control an idle rotation speed of the internal combustion engine. A water temperature sensor for detecting a temperature, a setting device that outputs a setting signal for setting a control characteristic of an idle speed of the internal combustion engine, and a setting device that is responsive to the water temperature sensor and the setting device and is determined according to the setting signal. A target value calculating unit for calculating a target rotation speed value of the idle rotation speed with respect to the water temperature at that time according to a target rotation speed value characteristic of the idle rotation speed with respect to the water temperature, and an output from the target value calculation unit. The idle operation control device for an internal combustion engine, wherein the supplied fuel is adjusted so as to obtain the target rotation speed value in response to .