JP2000073835A - Throttle control device and fuel control device for motor vehicle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To detect an abnormality in a short time without wrong judgment of the abnormality by estimating a limit value from the dispersion of throuttle valve operation on the basis of a target value from an accelerator pedal position sensor, and adding or subtracting an allowable value to or from the limit value to set upper and lower limit values. SOLUTION: When throttle valve operation is judged normal on the basis of a target value by an accelerator position detection signal, an operation of estimating a limit value to the throttle value operation or the upper and lower limit values according to the voltage of a power source is performed. In the upper and lower limit value operation, larger and smaller values of a target opening and at least the previous target opening are selected to calculate a dead time element, and the dead time element is subjected to first order filtering to calculate a first order lag element. The larger and smaller values of the dead time element and the first order lag element are selected to calculate the throttle value operation upper and lower limit values, and an allowable value is added to and subtracted from the calculated throttle value operation higher and lower limit values to calculate the upper and lower limit values of throttle valve operation.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile throttle control device, a control method, and a fuel control device.

[0002]

2. Description of the Related Art It is known that an abnormality is determined based on a deviation between an estimated opening degree of a throttle valve (throttle valve) and an actual opening degree, and that an abnormality is determined when the opening degree of a throttle valve exceeds a predetermined upper and lower limit value. It is.

Japanese Patent Laid-Open Publication No. Sho 59-190445 discloses an accelerator for detecting the displacement of an accelerator operation element when determining that an abnormality occurs when the throttle valve opening exceeds a predetermined limit value. Displacement amount detecting means, control signal generating means for outputting a control signal indicating an opening target value corresponding to the output of the accelerator displacement amount detecting means, and a throttle valve opening for detecting a current opening value of the throttle valve A throttle valve that sets a deviation between an opening target value indicated by a control signal output from the control signal generating unit and a current opening value detected by the throttle valve opening detecting unit to zero. Servo drive means for driving the opening and closing of the throttle valve, opening limit detection means for detecting that the opening of the throttle valve has reached at least one of a predetermined limit value in the opening direction or the closing direction, and the throttle A vehicle comprising: an abnormality determination unit configured to determine an abnormality when a deviation between the target opening value and the current opening value exceeds a predetermined allowable value when the opening is detected to be at a predetermined limit value. An accelerator control device is described.

Japanese Patent Application Laid-Open No. 61-54329 discloses an accelerator pedal and an accelerator connected to the accelerator pedal for determining that an abnormality has occurred when the throttle valve opening exceeds a predetermined upper and lower limit value. A pedal position sensor, an operating device for operating a throttle valve of the engine, and an operation based on a control deviation of a target value from the throttle valve position sensor and an actual value from the throttle valve position sensor coupled to the throttle valve. A monitoring device for an electronically controlled throttle valve of a vehicle, comprising a controller for generating a signal at an output stage for driving the device,
A logic circuit is provided, and when the throttle valve is at a predetermined position, the control of the operating device is released to compare the actual value with the upper and lower limits through the logic circuit, and the actual value exceeds the upper limit or the lower limit. A monitoring device for an electronically controlled throttle valve of a motor vehicle which generates a malfunction signal when it falls below is described.
Further, in this publication, a signal obtained from a dynamic characteristic of a control circuit is formed from a control deviation by a filter, and a signal from this filter is compared with a predetermined threshold value. It is described that it was done.

[0005]

In the case of an electronic accelerator pedal as described above, special consideration must be given to safety. In the case of a complicated electronic control unit, the number of failures and malfunctions necessarily increases with the number of elements. In particular, as a malfunction, it is necessary to monitor the function of the accelerator pedal and the position sensor of the throttle valve, and in particular, the driving state of the throttle valve caused by a mechanical failure such as wear and dirt. Therefore, conventionally, upper and lower limits are set for an accelerator pedal or a throttle valve, and a logically acceptable state and an unacceptable state are derived from the upper and lower limits to determine a malfunction.

In JP-A-61-54329, abnormality is determined simply by comparing the upper and lower limit values with the actual value. However, when the throttle control is in a transient state, it is easy to erroneously determine the normal state and the abnormal state. It is necessary to increase the lower limit value or set a longer time until the abnormality is determined.

However, when the throttle control is in a steady state such as when the running state of the vehicle is steady, the throttle is suddenly opened, and it is necessary to perform a corresponding process before the vehicle enters an unexpectedly sudden acceleration state. It is necessary to set the lower limit value to be small and to set the time until the abnormality determination short.

An object of the present invention is to detect an abnormality in a short time in an abnormal state without erroneously determining the abnormality in a normal state.

Accordingly, the present invention has been made to solve such a problem, and it is an object of the present invention to improve the safety of an automobile by reliably detecting a malfunction in a logic circuit and detecting other malfunctions in a control circuit. It is an object to provide an electronic throttle control device and a fuel control device.

[0010]

According to the present invention, upper and lower limit values, that is, limit values are first estimated from variations in throttle operation based on a target value from an accelerator pedal position sensor.
An upper limit value and a lower limit value are set by adding or subtracting an allowable value to or from this limit value, thereby shortening the time until abnormality determination.

Another feature of the present invention is that an abnormality is determined by monitoring the throttle valve opening when the throttle control is changed from the permission state to the non-permission state.

The present invention specifically provides the following devices.

The present invention provides an accelerator pedal position sensor for outputting a signal in association with the operation of an accelerator pedal, a drive source for driving a throttle valve, and a throttle valve position for outputting a signal in association with the operation of the throttle valve. A controller for controlling the drive source based on at least a deviation between a target value signal output from the accelerator pedal position sensor and a throttle valve position signal output from the throttle valve position sensor; and the drive source. A throttle control device for a vehicle equipped with a throttle valve return mechanism for closing the throttle valve when the driving of the throttle valve is stopped, when the throttle valve operation is determined to be normal based on the target value, the throttle operation limit value Limit value estimating means for setting
Upper and lower limit value calculating means for calculating an upper limit value and a lower limit value by adding or subtracting an allowable amount to or from the limit value, and abnormality determining means for determining that the throttle valve position signal has exceeded the upper limit value. And a drive source stopping means for stopping driving of the drive source when an abnormality is determined.

The present invention provides an accelerator pedal position sensor for outputting a signal in cooperation with the operation of an accelerator pedal, a drive source for driving a throttle valve, and a throttle valve position for outputting a signal in cooperation with the operation of the throttle valve. A controller for controlling the drive source based on at least a deviation between a target value signal output from the accelerator pedal position sensor and a throttle valve position signal output from the throttle valve position sensor; and the drive source. A throttle control device for a vehicle equipped with a throttle valve return mechanism for closing the throttle valve when the driving of the throttle valve is stopped, when the throttle valve operation is determined to be normal based on the target value, the throttle operation limit value Limit value estimating means for setting
Limit value calculating means for calculating an upper limit value and a lower limit value by adding or subtracting an allowable amount to or from the limit value, and limit value integrating means for respectively integrating values exceeding the upper limit value and the lower limit value, A throttle control device for an automobile, comprising: a driving source stopping unit that compares an integrated value with a predetermined value and stops driving of the driving source on condition that the integrated value is equal to or more than the predetermined value. .

Preferably, the upper and lower limit values can be set based on a variation in operation when the throttle operation is normal, a throttle valve operation delay time, and a primary delay from a primary delay filter.

[0016] Preferably, the limit value is an upper limit value, and includes abnormality determination means for determining that the drive command value from the controller is higher than the upper limit value for a predetermined time or more. be able to.

The present invention provides an accelerator pedal position sensor for outputting a signal in association with the operation of an accelerator pedal, a drive source for driving a throttle valve, and a throttle valve position for outputting a signal in association with the operation of the throttle valve. A controller that controls the drive source based on a deviation between a target value that is at least an output from the accelerator pedal position sensor and an actual value that is an output from the throttle valve position sensor,
In a throttle control device for a vehicle equipped with a throttle valve return mechanism for closing the throttle valve when the driving of the drive source is stopped, at least a throttle valve opening when the throttle control is changed from a permitted state to a non-permitted state is monitored. A throttle valve opening monitoring means for comparing the throttle valve opening with a predetermined opening, and an abnormality determining means for determining an abnormality on condition that the throttle valve opening is equal to or more than the predetermined opening. The present invention provides a throttle control device for an automobile.

The present invention provides an accelerator pedal position sensor for outputting a signal in association with the operation of an accelerator pedal, a drive source for driving a throttle valve, and a throttle valve position for outputting a signal in association with the operation of the throttle valve. A controller that controls the drive source based on a deviation between a target value that is at least an output from the accelerator pedal position sensor and an actual value that is an output from the throttle valve position sensor,
In a fuel control device for a vehicle having a throttle valve return mechanism that closes the throttle valve when the drive of the drive source stops, at least a throttle valve opening when the throttle control is changed from a permitted state to a non-permitted state is monitored. A throttle valve opening monitoring means, an abnormality determining means for comparing the throttle valve opening with a predetermined opening, and determining an abnormality on condition that the throttle valve opening is equal to or more than the predetermined opening;
Provided is a vehicle fuel control device including: an engine output reduction means for performing a fuel cut when it is determined to be abnormal.

The present invention provides an accelerator pedal position sensor for outputting a signal in cooperation with the operation of an accelerator pedal, a drive source for driving a throttle valve, and a throttle valve position for outputting a signal in cooperation with the operation of the throttle valve. A controller that controls the drive source based on a deviation between a target value that is at least an output from the accelerator pedal position sensor and an actual value that is an output from the throttle valve position sensor,
In a fuel control device for an automobile having a throttle valve return mechanism that closes the throttle valve when the drive of the drive source is stopped, a variation in operation when the throttle valve operation is determined to be normal based on the target value may be reduced. Upper limit value setting means for setting an upper limit value for the throttle operation, first abnormality determination means for determining that the throttle valve position has exceeded the upper limit value, and A drive source stopping means for stopping the driving of the drive source, a throttle valve opening monitoring means for monitoring the throttle valve opening, and comparing the throttle valve opening with a predetermined opening to determine whether the throttle valve opening is a predetermined value. An automatic configuration including a second abnormality determination unit that determines an abnormality on condition that the opening is equal to or more than an opening degree and an engine output reduction unit that performs a fuel cut when the abnormality is determined. Providing the fuel control system.

[0020]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows an example of an engine system to which the present invention is applied. In the figure, air to be taken in by an engine 1 is taken in from an inlet 4 of an air cleaner 3 and enters a collector 8 through a throttle valve device 7 provided with a throttle valve 6 for controlling the amount of intake air.
The throttle valve 6 is connected to a motor 10, and the throttle valve 6 is operated by driving the motor 10. The amount of intake air is controlled by operating the throttle valve 6. The intake air reaching the collector 8 is distributed to each intake air pipe 19 connected to each cylinder 2 of the engine 1 and guided to the cylinder 2.

On the other hand, fuel such as gasoline is sucked and pressurized from a fuel tank 11 by a fuel pump 12, and then supplied to a fuel system in which a fuel injection valve 13 and a fuel pressure regulator 14 are piped. The fuel system is adjusted to a predetermined pressure by the above-described fuel pressure regulator 14, and is injected into the cylinder 2 from a fuel injection valve 13 having a fuel injection opening in each cylinder 2. Further, a signal representing the intake flow rate is output from the air flow system 5 and input to the control unit 15.

Further, the throttle valve device 7 is provided with a throttle sensor 18 for detecting the opening degree of the throttle valve 6, and its output is also controlled by the control unit 1.
5 is input.

Reference numeral 16 denotes a crank angle sensor which is driven to rotate by a camshaft 27 and outputs a signal indicating the rotational position of the crankshaft. This signal is also input to the control unit 15.

Reference numeral 20 denotes an A / F sensor provided in the exhaust pipe 28. The A / F sensor detects and outputs the actual operating air-fuel ratio from the exhaust gas component, and its signal is input to the control unit 15 in the same manner.

Reference numeral 9 denotes an accelerator sensor provided integrally with the throttle valve device 7, which is connected to the accelerator pedal 12, detects and outputs the amount of operation of the accelerator pedal 12 by the driver, and outputs the signal to the control unit 15.
Is input to

The control unit 15 has a processing means 26, and takes in signals from various sensors for detecting the operating state of the engine, such as the crank angle signal and the accelerator opening signal, as input signals. It executes calculations and outputs various control signals calculated as a result of the calculations, and outputs the fuel injection valve 13 and the ignition coil 17 described above.
A predetermined control signal is output to the motor 10 for operating the throttle valve and the throttle valve to execute fuel supply control, ignition timing control, and intake air amount control.

A motor driver relay 31, a control unit relay 32, and an ignition switch 33 are provided between the power supply (battery) 30 and the control unit 15.

Reference numeral 35 denotes a warning device.

Since these structures are well known, no further explanation is required.

FIG. 2 schematically shows a throttle valve control device. The throttle valve 6 is fixed to a throttle valve shaft 40,
It is rotatably held by a throttle body main body (not shown). A drive member 41 is connected to the throttle valve shaft 40, and the throttle valve 6 is opened and closed by a motor actuator 42 through the drive member 41. The drive control signal for the actuator 42 is provided from the control unit 15. Further, an engagement member 43 composed of a thin metal lever is provided which is engaged when the drive member 41 is opened in the throttle valve closing direction, and the engagement member 43 and the drive member 41 are provided between these members. Return spring 4 for applying a biasing force in a direction for rotating the springs in opposite directions.
4 is stretched. A default spring 45 is provided between the engagement member 43 and the throttle body main body to apply a force to rotate the throttle valve 6 in the opening direction. Further, the throttle body body has a fully closed position stopper 46 for defining a fully closed position of the throttle valve 6,
Fully-open stopper 5 for defining the fully-open position of throttle valve 6
2. A default stopper 47 for defining the position of the throttle valve 6 when the drive control signal of the actuator 42 is stopped is provided. The position of the driving member 41 is detected by the throttle valve sensor 48 and is input to the control unit 15.

In this configuration, during normal operation, the actuator 42 causes the throttle valve 6 and the driving member 41 to open and close between the position of the fully closed stopper 46 and the position of the fully opened stopper 52. When the engine is stopped, the throttle valve 6 is open from the fully closed position (default state), so that the restartability of the engine can be improved and sticking of the throttle valve can be prevented.

The movement of the accelerator pedal 49 is transmitted to the limp home ring 50.

An accelerator return spring 51 is provided between the throttle body main body and the link member 50. In this state, the position of the link member 50 is detected by the accelerator sensor 9 and input to the control unit 15.

FIGS. 3 and 4 are block diagrams schematically showing the overall configuration of the embodiment of the present invention. In FIG. 3, the throttle control device of the automobile includes an accelerator pedal 49, an accelerator pedal position sensor coupled to the accelerator pedal 49 and outputting an accelerator position detection signal 62 in cooperation with the operation of the accelerator pedal, the throttle valve 6, A drive source 64 for driving the throttle valve 6 and a throttle valve position sensor coupled to the throttle valve 6 and outputting a throttle valve position detection signal 65 in cooperation with the throttle valve operation. The position detection signal 62 is input as a target value 67, and the throttle valve position detection signal 64 is input as an actual value 68. The controller 65 controls the driving source 64 based on the deviation outputted by comparing the target value 67 and the actual value 68 by the comparator 69.

When the drive of the drive source 64 is stopped, the throttle valve 6 is closed by an urging force.
3 are provided.

When it is determined that the throttle valve operation is normal based on the target value 67, the throttle valve operation is restricted to the limit value 7
0, that is, an operation for estimating the upper limit value and the lower limit value is performed. These upper and lower limits are estimated according to the voltage of the drive source 64. In this case, as shown in FIG. 5 and FIG. 6, the maximum or minimum value among the target values up to a predetermined number of times before is the upper limit value or the lower limit value. That is, the upper and lower limit values are estimated in consideration of variations in operation when the throttle operation is normal.

The method of calculating the upper limit value of the throttle valve operation will be specifically described with reference to FIG. Target opening and at least 1
A large value is selected from the previous target opening degrees, and a waste time factor is calculated.

Next, a primary filtering process is performed on the waste time element to calculate a primary delay element. A larger value is selected from the calculated waste time element and first-order lag element, and the throttle valve operation upper limit value is calculated. An allowable value is added to the calculated throttle valve operation upper limit value to calculate a throttle valve operation upper limit value.

Next, a method of calculating the upper and lower limit values of the throttle valve operation will be described with reference to FIG.

A smaller value is selected from the target opening and the target opening at least one time before, and a waste time factor is calculated. Next, a primary filtering process is performed on the waste time element to calculate a primary delay element. A smaller value is selected from the calculated waste time element and the first-order lag element, and the upper and lower limits of the throttle operation are calculated. An allowable value is subtracted from the calculated throttle operation lower limit value to calculate a throttle valve operation upper and lower limit value.

As will be described later, the upper and lower limit values are estimated by observing the throttle valve operation delay (referred to as waste time) with respect to the accelerator pedal input signal and the primary delay 71 by a primary delay filter.

In order to calculate the margin for the throttle valve to be fully opened and fully closed, an allowable value 73 is added to the upper limit value, and the allowable value 73 is subtracted from the lower limit value to calculate the upper limit value and the lower limit value 72. Is done. In this way, the upper and lower limits of the variation in operation when the throttle operation is normal are estimated from the target opening, and the upper and lower limits are set to the upper and lower limits by adding and subtracting the permitted value. Is determined. As a result, it is possible to detect an abnormality in a short time when an abnormality occurs, without erroneously determining that an abnormality occurs during a normal operation.

An abnormality determination 74 is made when the throttle valve position signal 68, which is the actual value, exceeds the upper limit value obtained by adding the allowable value to the upper limit value. Alternatively, when the drive source is a motor, the abnormality may be determined when the motor drive command value is equal to or more than the upper limit value for a predetermined time. The drive source 6 that drives the throttle valve 63 when an abnormality is determined
4 is stopped. The driving of the driving source 64 is temporarily stopped,
When the limit value is not exceeded, driving is restarted.

The upper limit value and the lower limit value are calculated. When the upper limit value and the lower limit value are exceeded, the respective values are integrated 72. If the integrated value exceeds a predetermined value, an abnormality determination 74 is made. The drive of the drive valve 64 for driving the throttle valve is stopped.

When the target value 67 changes suddenly, it is assumed that no abnormality is determined for a predetermined time from the sudden change 17.
The aforementioned motor drive value includes the drive output duty.

In FIG. 4, the throttle opening 81 is monitored at the timing when the throttle control is changed from the permission state to the non-permission state, and is compared with a predetermined throttle opening 82 by a comparator 83. An abnormality determination 84 is performed. The fuel cut is performed when it is determined to be abnormal. This constitutes a fuel control device.

By providing the controllers separately described in FIGS. 3 and 4 as a group of functions, when it is determined that the throttle valve operation is normal based on the target value 67, the throttle Upper limit value 7 for operation
An upper limit value setting means for setting the upper limit value 72;
First abnormality determination means for determining that the throttle valve position has exceeded the predetermined position, a drive source stop means for stopping the drive of the drive source when an abnormality determination is made, and a throttle valve opening degree of 8.
A second abnormality which compares the throttle valve opening with a predetermined opening and determines an abnormality 84 on condition that the throttle valve opening is equal to or larger than the predetermined opening. There is provided a vehicle fuel control device including a determination unit and an engine output reduction unit that performs a fuel cut when the abnormality is determined.

FIG. 7 is a flowchart showing a throttle control procedure to which the present invention is applied. In the figure, an accelerator sensor signal is read (step 100), a throttle sensor signal is read (step 101), an accelerator opening is calculated (step 102), and a throttle opening is calculated (step 103). The throttle valve target opening is calculated (step 104), the upper and lower limit diagnosis of the throttle valve operation is performed (step 105), and the throttle valve drive command value diagnosis is performed (step 106). Is the throttle control allowed? (Step 107), and in the case of No, the motor driver is turned off and the motor drive output is turned off (Step 112), and the throttle opening diagnosis is performed after the control is stopped (Step 113). In the case of Yes, a feedback control constant is determined (step 108), and throttle feedback control is performed (step 109). A motor drive command value calculation is performed (step 110), a motor drive output is performed (step 111), and the process ends.

FIG. 8 is a flowchart showing the diagnosis of the upper and lower limits of the throttle valve operation according to the present invention. In the figure, a target opening is read (step 200), and upper and lower limit calculation of a throttle valve operation is performed (step 201). The throttle valve operation upper limit value calculation is executed from the upper limit value = operation upper limit value + allowable value (step 202). The lower limit value of the throttle valve operation is calculated from the lower limit value = the lower limit value of operation—the allowable value (step 203). Has the value been exceeded? Is determined (step 205). In the case of Yes, the motor drive command value is set to 0 (step 206), and the process proceeds to step 207. In the case of No, the upper and lower limit value excess amounts are respectively integrated (step 207), and is the upper and lower limit value excess amount integrated value exceeding a predetermined value? Is determined (step 208). In the case of No, the process is terminated, and in the case of Yes, the upper and lower limit of the throttle valve operation is diagnosed as abnormal (step 209), the throttle control is not permitted (step 201), and the process is terminated.

FIG. 9 is a flow chart of the throttle valve command value command value diagnosis of the present invention. In the figure, a throttle valve drive command value is read (step 300),
The target opening is read (step 301). A target opening change calculation is performed (step 302), and has a predetermined time elapsed after the target opening change has changed by a predetermined value or more? Is determined (step 303). If No, the process ends; if Yes, is the throttle valve drive command value equal to or greater than a predetermined value? Is determined (step 304). If No, the process ends; if Yes, does a certain time elapse? Is determined (step 305). N
In the case of o, the process is terminated, and in the case of Yes, a throttle valve drive command value abnormality determination is performed (step 306), the throttle control is not permitted (step 307), and the process ends.

FIG. 10 is a flowchart of a throttle opening diagnosis after control stop according to the present invention. In the figure, a throttle valve opening is read (step 400), and is the throttle valve opening a predetermined value or more? (Step 4
01). If No, the process ends; if Yes, does a certain time elapse? (Step 402) If No, the processing ends.
In the case of Yes, after the control is stopped, the throttle opening abnormality is determined (step 403), and the fuel is cut (step 40).
4), end.

FIGS. 11A and 11B are timing charts of the upper and lower limit limit diagnosis of the throttle valve operation. FIG. 11A shows a state when the throttle operation is normal, and FIG. 11B shows a state when the throttle operation is abnormal. In (a), the throttle operation upper limit value for the target opening is determined by calculating the upper limit value + allowable value as described above, and the throttle operation lower limit value is determined by calculating the lower limit value−allowable value. . in this case,
Each limit value is set as shown in the figure due to a delay due to waste time and a first-order lag phenomenon caused by a first-order lag filter with respect to the accelerator position signal. When the throttle operation is normal, the throttle valve opening signal changes along a thick dotted line. As shown in (b), when the throttle operation is abnormal, the throttle valve opening signal becomes as shown in the figure, and exceeds the upper limit value of the throttle operation or falls below the lower limit value of the throttle operation. If the throttle valve opening signal exceeds these limit values, an abnormality determination is made and the motor drive output is switched from On to Off. The excess amount, that is, the upper and lower limit value excess amounts are integrated, and when each integrated value exceeds a predetermined value, the motor driver relay, which has been On, is turned Off.
Switch to.

FIG. 12 is a timing chart of the throttle valve command value diagnosis. In the drawing, it is assumed that the throttle valve opening signal changes as indicated by the thick dotted line with respect to the target opening. When the motor drive command value is normal, if the target opening changes suddenly, a diagnosis prohibition time is set and the motor drive value diagnosis is prohibited. After this section, the motor drive command value abnormality determination time is set. The motor drive command value diagnosis is executed and the time is counted. If the motor drive command value changes from normal to abnormal, the motor drive command value diagnosis ends. When the motor drive command value is abnormal, the motor driver relay is switched from On to Off when the motor drive command value abnormality determination time has elapsed.

FIG. 13 is a timing chart of the throttle opening diagnosis after the control is stopped. The figure shows a normal throttle opening degree after control stop and a abnormal throttle opening state after control stop in response to an abnormality determination throttle opening signal.
The normal engine speed and the abnormal engine speed in these cases are also shown. The throttle opening abnormality determination time after the control is stopped is set as shown in the figure. Upon entering the determination time, the motor driver relay is switched from On to Off. After the control is stopped, when the throttle opening diagnosis is changed from the normal judgment to the abnormal judgment, the fuel cut is performed.

[0056]

According to the present invention, in order to solve this problem,
The upper and lower limits of the variation in the operation when the throttle operation is normal are estimated from the target opening, and when the upper and lower limits exceed the upper and lower limit values obtained by adding and subtracting a permissible value, it is determined to be abnormal. Thus, it is possible to detect an abnormality in a short time when an abnormality occurs, without erroneously determining that an abnormality occurs during a normal operation.

[Brief description of the drawings]

FIG. 1 is a diagram showing an example of an engine system to which the present invention is applied.

FIG. 2 is a conceptual diagram of a throttle valve control device to which the present invention is applied.

FIG. 3 is a block diagram of a throttle control device to which the present invention is applied.

FIG. 4 is a block diagram of a throttle control device and a fuel control device to which the present invention is applied.

FIG. 5 is a flowchart for calculating a throttle valve operation upper limit value.

FIG. 6 is a flowchart for calculating the lower limit value of the throttle valve operation.

FIG. 7 is a flowchart showing a throttle valve control procedure to which the present invention is applied.

FIG. 8 is a flowchart of a throttle valve operation upper and lower limit diagnosis of the present invention.

FIG. 9 is a flowchart of a throttle valve command value diagnosis according to the present invention.

FIG. 10 is a flowchart of a throttle opening diagnosis after control stop according to the present invention.

FIG. 11 is a timing chart of the upper and lower limit diagnosis of the throttle valve operation according to the present invention.

FIG. 12 is a timing chart of a throttle valve command value diagnosis according to the present invention.

FIG. 13 is a timing chart of a throttle opening degree diagnosis after control stop according to the present invention.

[Explanation of symbols]

1 ... Engine, 5 ... Air flow meter, 6 ... Throttle valve, 7
... Throttle valve device, 10 ... Motor, 12 ... Accelerator pedal, 13 ... Fuel injection valve, 15 ... Control unit, 26 ... Processing means, 40 ... Throttle valve shaft, 41 ... Drive member, 42 ... Actuator, 43 ... Engagement member , 44
... return spring, 45 ... default spring,
48: throttle valve sensor, 49: accelerator pedal, 5
0: link for limp home, 51: accelerator return spring.

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) F02D 45/00 335 F02D 45/00 335A 364 364J (72) Inventor Minoru Okubo 2520 Oaza Takaba, Hitachinaka City, Ibaraki Prefecture Address Co., Ltd.Hitachi, Ltd.Automotive Equipment Division (72) Inventor Masahiro Iriyama 2 Takara-cho, Kanagawa-ku, Yokohama-shi, Kanagawa Nissan Motor Co., Ltd. In-house F-term (reference) 3G065 CA34 CA36 CA40 DA05 FA06 FA07 FA11 GA05 GA41 GA46 KA36 3G084 BA05 BA13 DA27 DA33 EA01 EA11 EB11 FA10 3G301 JA08 JB02 JB07 JB08 JB09 LA03 LC03 MA24 NA08 NB07 ND01 PA03 NE17 NE03 NE01

Claims (7)

[Claims] An accelerator pedal position sensor for outputting a signal in cooperation with the operation of an accelerator pedal, a drive source for driving a throttle valve, a throttle valve position sensor for outputting a signal in cooperation with the operation of the throttle valve, and A controller for controlling the drive source based on at least a deviation between a target value signal output from the accelerator pedal position sensor and a throttle valve position signal output from the throttle valve position sensor; and driving of the drive source. A throttle control device for a vehicle having a throttle valve return mechanism that closes the throttle valve when the throttle valve stops, wherein a limit value for the throttle operation is set when it is determined that the throttle valve operation is normal based on the target value. Limit value estimating means for calculating an upper limit value and a lower limit value by adding or subtracting an allowable amount to or from the limit value. A lower limit value calculating means; an abnormality determining means for determining that the throttle valve position signal has exceeded the upper limit value; and a drive source stopping means for stopping the drive of the drive source when an abnormality is determined. An automotive throttle control device characterized by comprising: 2. An accelerator pedal position sensor for outputting a signal in cooperation with the operation of an accelerator pedal, a drive source for driving a throttle valve, and a throttle valve position sensor for outputting a signal in cooperation with the operation of the throttle valve. A controller for controlling the drive source based on at least a deviation between a target value signal output from the accelerator pedal position sensor and a throttle valve position signal output from the throttle valve position sensor; and driving of the drive source. A throttle control device for a vehicle having a throttle valve return mechanism that closes the throttle valve when the throttle valve stops, wherein a limit value for the throttle operation is set when it is determined that the throttle valve operation is normal based on the target value. Limit value estimating means for calculating an upper limit value and a lower limit value by adding or subtracting an allowable amount to or from the limit value. Threshold value calculating means, limit value integrating means for integrating values exceeding the upper limit value and lower limit value, respectively, comparing the integrated value with a predetermined value, and providing that the integrated value is equal to or greater than the predetermined value. And a drive source stopping means for stopping driving of the drive source. 3. The method according to claim 1, wherein the upper and lower limit values are set based on a variation in operation when the throttle operation is normal, a throttle valve operation delay time, and a primary delay from a primary delay filter. Characteristic automotive throttle control device. 4. An abnormality determining means according to claim 1, wherein said limit value is an upper limit value, and said drive command value from said controller is connected for a predetermined time or more when said drive command value is higher than said upper limit value. An automotive throttle control device comprising: 5. An accelerator pedal position sensor for outputting a signal in cooperation with the operation of an accelerator pedal, a drive source for driving a throttle valve, and a throttle valve position sensor for outputting a signal in cooperation with the operation of the throttle valve. A controller that controls the drive source based on at least a deviation between a target value that is an output from the accelerator pedal position sensor and an actual value that is an output from the throttle valve position sensor, and the drive of the drive source is stopped. A throttle control device for a vehicle provided with a throttle valve return mechanism for closing the throttle valve when the throttle control is at least changed from a throttle control permission state to a non-permission state. The throttle valve opening is compared with a predetermined opening, and the condition is that the throttle valve opening is equal to or more than the predetermined opening. That Te is configured to include an abnormality judging unit that abnormality determining throttle control apparatus for an automobile according to claim. 6. An accelerator pedal position sensor for outputting a signal in cooperation with the operation of an accelerator pedal, a drive source for driving a throttle valve, and a throttle valve position sensor for outputting a signal in cooperation with the operation of the throttle valve. A controller that controls the drive source based on at least a deviation between a target value that is an output from the accelerator pedal position sensor and an actual value that is an output from the throttle valve position sensor, and the drive of the drive source is stopped. A fuel control device for an automobile having a throttle valve return mechanism for closing the throttle valve when the throttle control is at least changed from a throttle control permission state to a non-permission state. The throttle valve opening is compared with a predetermined opening, and the difference is determined on the condition that the throttle valve opening is equal to or larger than the predetermined opening. And abnormality determining means for determining an abnormality and when it is determined, the fuel control device of a motor vehicle, characterized in that it is configured to include an engine output reduction means for performing fuel cut. 7. An accelerator pedal position sensor for outputting a signal in cooperation with the operation of an accelerator pedal, a drive source for driving a throttle valve, and a throttle valve position sensor for outputting a signal in cooperation with the operation of the throttle valve. A controller that controls the drive source based on at least a deviation between a target value that is an output from the accelerator pedal position sensor and an actual value that is an output from the throttle valve position sensor, and the drive of the drive source is stopped. A fuel control device for a vehicle equipped with a throttle valve return mechanism that closes the throttle valve when the throttle operation is determined to be normal based on the target value. Upper limit value setting means for setting a limit value; first abnormality determination for determining that the throttle valve position has exceeded the upper limit value A drive source stop means for stopping the drive of the drive source when an abnormality is determined; a throttle valve opening monitoring means for monitoring a throttle valve opening; and a throttle valve opening and a predetermined opening. A second abnormality judging means for judging an abnormality on condition that the throttle valve opening is equal to or more than a predetermined opening, and an engine output decreasing means for performing a fuel cut when it is judged to be abnormal. A fuel control device for an automobile.