JP2004293441A - Abnormality processing device for accelerator sensor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To ensure easy control of the engine output by a driver in an abnormality processing device for an accelerator sensor detecting abnormality of the sensor outputting a signal according to an accelerator depression amount, and performing the processing of the abnormality. <P>SOLUTION: The device has an acceleration member operated by the driver, the sensor outputting the signal according to an operating amount of the acceleration member, an abnormality detection means detecting the abnormality of the sensor, an idle side switch which turns on at the time of no-operation of the acceleration member, a full side switch which turns on at the time of the maximum operation of the acceleration member, and a control means which sets up an accelerator opening when the abnormality of the sensor is detected with the abnormality detection means. The control means inputs gear shift position of a shift lever, and sets up the accelerator opening according to the gear shift position. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to an accelerator sensor abnormality processing device that detects an abnormality of a sensor that outputs a signal corresponding to an accelerator pedal depression amount and performs processing for the abnormality.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as an accelerator sensor abnormality processing device that detects an abnormality of a sensor that outputs a signal corresponding to an accelerator pedal depression amount and performs a process for the abnormality, for example, one disclosed in Japanese Patent Application Laid-Open No. 6-137205 is known. I have.
In the accelerator sensor abnormality processing device disclosed in this publication, when a sensor is detected to be abnormal and a full-side switch is turned on, a predetermined pseudo accelerator pedal depression amount is added to an accelerator pedal depression amount signal (ACCP). .
[0003]
When the full-side switch is turned off from on and the full-side switch and the idle-side switch are turned off, the accelerator depression amount signal at this time is held.
Therefore, continuous engine output control can be performed according to the driver's will.
[Patent Document 1]
JP-A-6-137205
[Problems to be solved by the invention]
However, in the above-described accelerator sensor abnormality processing device, since the engine output is controlled only by operating the accelerator pedal, there is a problem that it is not easy for the driver to control the engine output.
[0005]
The present invention has been made to solve such a conventional problem, and an object of the present invention is to provide an accelerator sensor abnormality processing device that enables a driver to easily and reliably control engine output.
[0006]
[Means for Solving the Problems]
The accelerator sensor abnormality processing device according to claim 1, wherein the accelerator member operated by a driver, a sensor that outputs a signal corresponding to an operation amount of the accelerator member, an abnormality detection unit that detects abnormality of the sensor, An idle-side switch that is turned on when the accelerator member is not operated, a full-side switch that is turned on when the accelerator member is operated maximally, and a control unit that sets an accelerator opening when an abnormality of the sensor is detected by the abnormality detection unit. Wherein the control means inputs a shift position of a shift lever, and sets the accelerator opening in accordance with the input shift position.
[0007]
The accelerator sensor abnormality processing device according to claim 2, wherein the accelerator member operated by a driver, a sensor that outputs a signal corresponding to an operation amount of the accelerator member, an abnormality detection unit that detects abnormality of the sensor, An idle-side switch that is turned on when the accelerator member is not operated, a full-side switch that is turned on when the accelerator member is operated maximally, and a control unit that sets an accelerator opening when an abnormality of the sensor is detected by the abnormality detection unit. Wherein the control means inputs a set position of an idle volume, and sets the accelerator opening in accordance with the input set position.
[0008]
An accelerator sensor abnormality processing device according to a third aspect of the present invention is the accelerator sensor abnormality processing device according to the first or second aspect, wherein the control means sets the accelerator opening to gradually increase. .
An accelerator sensor abnormality processing device according to a fourth aspect of the present invention is the accelerator sensor abnormality processing device according to any one of the first to third aspects, wherein the control unit detects an abnormality of the sensor by the abnormality detection unit. In such a case, the accelerator opening is set by turning off the idle side switch.
[0009]
(Action)
In the accelerator sensor abnormality processing device of the first aspect, the shift position of the shift lever is input to the control means, and the accelerator opening is set according to the input shift position.
That is, for example, when the shift lever is in the first speed, the accelerator opening is 100%, for example, when the shift lever is in the second speed, the accelerator opening is 80%, for example, and when the shift lever is in the third speed, the accelerator is open. The degree is set to, for example, 60%, and the lower the shift speed, the larger the accelerator opening.
[0010]
Therefore, the driver can easily and reliably change the accelerator opening by operating the shift lever.
In the accelerator sensor abnormality processing device according to the second aspect, the set position of the idle volume is input to the control means, and the accelerator opening is set according to the input set position.
[0011]
That is, for example, the accelerator opening is set to, for example, 0 to 100% with respect to the output of the idle volume from 0 to 100, and the greater the output of the idle volume, the greater the accelerator opening.
Therefore, the driver can easily and reliably change the accelerator opening by operating the idle volume.
[0012]
In the accelerator sensor abnormality processing device according to the third aspect, the control unit sets the accelerator opening to gradually increase.
In the accelerator sensor abnormality processing device according to the fourth aspect, when an abnormality of the sensor is detected by the abnormality detecting means, the accelerator opening is set by turning off an idle side switch caused by the driver stepping on the accelerator member.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(1st Embodiment)
FIG. 1 shows a diesel engine to which the first embodiment of the accelerator sensor abnormality processing device of the present invention is applied, and FIG. 2 schematically shows a configuration of the accelerator sensor.
[0014]
In this embodiment, the present invention is applied to a diesel engine such as a truck having an electronic governor.
In FIG. 2, an accelerator pedal 11 is connected to an accelerator sensor 15 via a lever 13.
As shown in FIG. 1, inside the accelerator sensor 15, a sensor 17 for outputting a voltage in an analog manner in accordance with the depression amount of the accelerator pedal 11, a full-side switch 19, and an idle-side switch 21 are arranged. I have.
[0015]
The full-side switch 19 outputs an ON signal when the depression amount of the accelerator pedal 11 reaches a maximum (full).
The idle-side switch 21 outputs an ON signal when the depression amount of the accelerator pedal 11 becomes minimum (idle position).
Then, a signal output from the accelerator sensor 15 is taken into an ECU (engine control unit) 23, subjected to arithmetic processing, and output to a fuel injection pump 27 equipped with an electronic governor 25.
[0016]
Then, the fuel injection control is executed based on this signal.
FIG. 3 is a block diagram showing the accelerator sensor abnormality processing device of this embodiment.
In this embodiment, a signal from an abnormality detection unit 31 that detects an abnormality of the sensor 17 is input to the control unit 29.
The abnormality detection means 31 determines that the sensor 17 is disconnected when the accelerator opening signal is not input from the sensor 17 even though the idle side switch 21 is off.
[0017]
The control unit 29 receives an ON signal from the idle side switch 21 that is turned on when the accelerator pedal 11 is not operated and an ON signal from the full side switch 19 that is turned on when the accelerator pedal 11 is fully operated.
In this embodiment, the shift position 33 of the shift lever is input to the control means 29.
[0018]
Then, the control unit 29 sets the accelerator opening when the abnormality of the sensor 17 is detected by the abnormality detection unit 31.
The accelerator opening set by the control means 29 is output to the electronic governor 25, and fuel injection control is performed.
FIG. 4 is a flowchart showing the operation of the accelerator sensor abnormality processing device of this embodiment.
[0019]
In this embodiment, first, in step S1, the abnormality detecting means 31 determines whether or not the sensor 17 is disconnected.
If the sensor 17 is disconnected, the display lamp in front of the driver's seat is lit to indicate an error in step S2.
Next, in step S3, it is determined whether the vehicle speed is 0 km / h, that is, whether the accelerator opening is 0%.
[0020]
If the accelerator opening is not 0%, in step S4, the fuel injection amount q is gradually reduced to 0, and the accelerator opening is reduced to 0%.
Next, in step S5, it is determined whether the signal from the idle side switch 21 is off, that is, whether or not the accelerator pedal 11 is depressed.
If the signal from the idle side switch 21 is ON, that is, if the accelerator pedal 11 has not been depressed, the accelerator opening is set to 0% in step S6.
[0021]
On the other hand, when the signal from the idle side switch 21 is off, in step S7, the accelerator opening is set according to the shift position of the shift lever.
In this embodiment, when the shift lever is in the first speed, the accelerator opening is 100%, when it is in the second speed, the accelerator opening is 80%, and when it is in the third speed, the accelerator opening is Is set to 60%, and the accelerator opening is set to 40% at the fourth speed or higher.
[0022]
That is, in this embodiment, the lower the shift speed, the larger the accelerator opening.
Then, in step S8, the accelerator opening corresponding to the shift position of the shift lever is output to the electronic governor 25.
Then, in this embodiment, as shown in FIG. 5, the control means 29 sets the accelerator opening to gradually increase and decrease.
[0023]
That is, in FIG. 5, a curve a shows a setting curve of the accelerator opening (100%) when the shift lever is located at the first speed, and a curve b shows an accelerator opening (100%) when the shift lever is located at the second speed. 80%).
From this figure, it can be seen that the accelerator opening is set to gradually increase and decrease.
[0024]
Further, the slope of the increase / decrease is set in accordance with the accelerator opening, and in this embodiment, the slope of the increase / decrease when the shift lever is located in the first speed is made larger than the slope of the increase / decrease when the shift lever is located in the second speed. ing.
In the accelerator sensor abnormality processing device described above, the shift position of the shift lever is input, and the accelerator opening is set in accordance with the input shift position. Output can be controlled easily and reliably.
[0025]
Further, in the accelerator sensor abnormality processing device described above, since the accelerator opening is gradually increased, it is possible to reliably prevent the vehicle from rapidly accelerating.
Further, in the accelerator sensor abnormality processing device described above, when the abnormality detecting means 31 detects the abnormality of the sensor 17, the accelerator opening is set by turning off the idle side switch 21 caused by the driver depressing the accelerator pedal 11. As a result, the control can be reliably executed according to the driver's will.
[0026]
(Second embodiment)
FIG. 6 is a block diagram showing an accelerator sensor abnormality processing device according to the second embodiment of the present invention.
In this embodiment, portions having the same functions as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.
[0027]
In this embodiment, signals from the abnormality detecting means 31, the idle-side switch 21, and the full-side switch 19 are input to the control means 29A.
In this embodiment, the set position 35 of the idle volume for setting the accelerator opening during idling is input to the control unit 29A.
Then, the control unit 29A sets the accelerator opening when the abnormality of the sensor 17 is detected by the abnormality detection unit 31.
[0028]
The accelerator opening set by the control unit 29A is output to the electronic governor 25, and fuel injection control is executed.
FIG. 7 is a flowchart showing the operation of the accelerator sensor abnormality processing device of this embodiment.
In this embodiment, first, in step S1, the abnormality detecting means 31 determines whether or not the sensor 17 is disconnected.
[0029]
If the sensor 17 is disconnected, the display lamp in front of the driver's seat is lit to indicate an error in step S2.
Next, in step S3, it is determined whether the vehicle speed is 0 km / h, that is, whether the accelerator opening is 0%.
[0030]
If the accelerator opening is not 0%, in step S4, the fuel injection amount q is gradually reduced to 0, and the accelerator opening is reduced to 0%.
Next, in step S5, it is determined whether the signal from the idle side switch 21 is off, that is, whether or not the accelerator pedal 11 is depressed.
If the signal from the idle side switch 21 is ON, that is, if the accelerator pedal 11 has not been depressed, the accelerator opening is set to 0% in step S6.
[0031]
On the other hand, when the signal from the idle side switch 21 is off, in step S7, the accelerator opening is set according to the set position of the idle volume.
In this embodiment, the accelerator opening is set to, for example, 0 to 100% with respect to the output (volume position) of the idle volume from 0 to 100, and the accelerator opening increases as the output of the idle volume increases. Is done.
[0032]
Then, in step S8, the accelerator opening corresponding to the set position of the idle volume is output to the electronic governor 25.
In this embodiment, since the set position of the idle volume is input and the accelerator opening is set according to the input set position, the driver operates the idle volume so that the engine output can be easily and easily controlled. It can be controlled reliably.
[0033]
Note that, in the above-described first embodiment, an example in which usable shift stages are applied to 4th speed or higher has been described. However, the present invention is not limited to such an embodiment, and is intended only for limp-home traveling. Thus, for example, the first speed or only the first speed and the second speed may be limited.
In the first and second embodiments described above, an example in which the signal from the idle side switch 21 is turned off, that is, the accelerator opening signal is output to the electronic governor 25 when the accelerator pedal 11 is depressed, will be described. However, the present invention is not limited to this embodiment. For example, in step S8, it is detected that the full-side switch 19 is turned on, that is, when the accelerator pedal 11 is fully depressed, the accelerator is opened. The degree signal may be output to the electronic governor 25.
[0034]
【The invention's effect】
As described above, in the accelerator sensor abnormality processing device according to the first aspect, the shift position of the shift lever is input, and the accelerator opening is set according to the input shift position. By operating the lever, the engine output can be controlled easily and reliably.
[0035]
In the accelerator sensor abnormality processing device according to the second aspect, the set position of the idle volume is input, and the accelerator opening is set according to the input set position, so that the driver operates the idle volume. In addition, the engine output can be easily and reliably controlled.
In the accelerator sensor abnormality processing device according to the third aspect, since the accelerator opening is gradually increased, sudden acceleration of the vehicle can be reliably prevented.
[0036]
In the accelerator sensor abnormality processing device according to the fourth aspect, when an abnormality of the sensor is detected by the abnormality detecting means, the accelerator opening is set by turning off an idle side switch caused by a driver depressing an accelerator pedal. The control can be executed according to the driver's will.
[Brief description of the drawings]
FIG. 1 is an explanatory diagram showing a diesel engine of a truck to which an embodiment of an accelerator sensor abnormality processing device of the present invention is applied.
FIG. 2 is an explanatory diagram showing an accelerator sensor.
FIG. 3 is a block diagram showing a first embodiment of an accelerator sensor abnormality processing device of the present invention.
FIG. 4 is a flowchart showing an operation of the accelerator sensor abnormality processing device of FIG. 3;
FIG. 5 is an explanatory diagram showing a setting curve of an accelerator opening.
FIG. 6 is a block diagram showing a second embodiment of the accelerator sensor abnormality processing device of the present invention.
FIG. 7 is a flowchart showing an operation of the accelerator sensor abnormality processing device of FIG. 6;
[Explanation of symbols]
11 accelerator pedal 15 accelerator sensor 17 sensor 19 full side switch 21 idle side switch 31 abnormality detecting means

Claims (4)

An accelerator member operated by a driver;
A sensor that outputs a signal corresponding to an operation amount of the accelerator member,
Abnormality detection means for detecting abnormality of the sensor,
An idle-side switch that is turned on when the accelerator member is not operated;
A full-side switch that is turned on at the time of maximum operation of the accelerator member,
Control means for setting an accelerator opening when the abnormality of the sensor is detected by the abnormality detection means,
Has,
The accelerator sensor abnormality processing device according to claim 1, wherein the control means inputs a shift position of a shift lever, and sets the accelerator opening in accordance with the input shift position. An accelerator member operated by a driver;
A sensor that outputs a signal corresponding to an operation amount of the accelerator member,
Abnormality detection means for detecting abnormality of the sensor,
An idle-side switch that is turned on when the accelerator member is not operated;
A full-side switch that is turned on at the time of maximum operation of the accelerator member,
Control means for setting an accelerator opening when the abnormality of the sensor is detected by the abnormality detection means,
Has,
The accelerator sensor abnormality processing device according to claim 1, wherein the control unit inputs a set position of an idle volume and sets the accelerator opening according to the input set position. The accelerator sensor abnormality processing device according to claim 1 or 2,
The accelerator sensor abnormality processing device, wherein the control means sets the accelerator opening so as to gradually increase. The accelerator sensor abnormality processing device according to any one of claims 1 to 3,
An accelerator sensor abnormality processing device, wherein the controller sets an accelerator opening by turning off the idle side switch when the abnormality of the sensor is detected by the abnormality detector.

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