JPH11257139A - Throttle opening diagnostic device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To quickly and properly diagnose trouble of throttle opening by driving a valve operating motor after an ignition switch is turned off, and in the case where a throttle valve is not in the intermediate opening after the driving stoppage, making it judge abnormality of energizing means. SOLUTION: In a control means 64, when an ignition switch 86 is turned off to stop an engine 2, a timer circuit 66a is started, and a target opening value θA at the full-close side of a throttle valve 34 is set up. Next, a valve operating motor 38 is energized with current, rotating a throttle valve 32 to the closed side until a full-closed state, actual valve opening at that time is set to a first opening value θA. Then, whether relations among the throttle valve full-close side normally judged threshold value A, the first opening value θa and the full-close side target opening value θA are |θA-θa|<=A or not is judged, and when the judgment is YES, the motor 38 is stopped. In the case where the throttle valve 32 after the stop of this motor is mot in a specified range of intermediate opening, spring or the like are judged abnormal.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a throttle opening diagnostic apparatus, and more particularly to a throttle valve opening / closing operation of a throttle valve by a valve operating motor and an intermediate means for urging the throttle valve by an urging means when the driving of the valve operating motor is stopped. The present invention relates to a throttle opening diagnostic device that holds an opening and diagnoses an abnormality of a throttle opening.

[0002]

2. Description of the Related Art Some vehicle engines are provided with an electronically controlled throttle system in order to improve fuel efficiency and drivability.

In this electronically controlled throttle system, a throttle body provided with a throttle valve is provided with a valve operating motor for opening and closing the throttle valve and a throttle valve when the drive of the valve operating motor is stopped. A biasing means for holding the intermediate opening and a throttle position sensor for detecting the throttle opening, which is the opening state of the throttle valve, are provided. The target throttle opening is calculated based on the depression state of the accelerator pedal, and the throttle valve is set to the target throttle position. While controlling the drive of the valve operating motor so that the opening degree, for example,
In some cases, the driving state of the valve operating motor is detected to diagnose an abnormality in the throttle opening. The above-mentioned urging means includes a return spring for urging the throttle valve to the closed side of the intermediate opening and a default (intermediate) spring for urging the throttle valve to the open side of the intermediate opening. When the drive is stopped, the throttle valve is held at the intermediate opening by the biasing forces of the return spring and the default spring.

[0004] Such a throttle system is disclosed in, for example, JP-A-6-229298 and JP-A-2-252926. JP-A-6
Japanese Patent Publication No. 229298 discloses a throttle system provided with a valve operating motor for operating a throttle valve. In the throttle system, the throttle opening is controlled by a throttle opening means as a parameter so that the throttle opening becomes a target opening. In addition to the first control signal generating means for calculating a signal, a second control signal generating means for calculating a control signal to the throttle valve driving means using a driving power supply value set in advance corresponding to the opening of the throttle valve as a parameter. Means for providing a control signal calculated by the second control signal generating means to the throttle valve driving means until the reference position of the throttle valve is detected. Is determined based on the position of the accelerator while the Control signal corresponding accurately to the target opening is given to the throttle valve driving means, in which a throttle control corresponding precisely to the accelerator operation of the driver is performed. Japanese Patent Application Laid-Open No. 2-252926 discloses a throttle system provided with a valve operating motor for operating a throttle valve. In a throttle system, during normal running of a vehicle, opening / closing control of a throttle valve according to an accelerator pedal depression amount is controlled. It is performed properly through the actuator, and in the event of disconnection or failure of the electric system, the actuator is stopped by an output signal from the control unit, and the throttle valve is fully closed to prevent abnormal running of the vehicle. By replacing the accelerator wire with a throttle cam provided on the throttle valve shaft, mechanical operation of the throttle valve becomes possible, so that normal traveling can be ensured.

[0005]

Conventionally, in a throttle system, an abnormality of the throttle opening is diagnosed based on the driving state of the valve operating motor, but the driving of the valve operating motor is stopped. It is difficult to detect the abnormality of the biasing means that holds the throttle valve at the intermediate opening when the vehicle is running, and it is difficult for the position of the accelerator pedal to constantly change during running of the vehicle to achieve a constant throttle opening For this reason, the abnormality of the urging means cannot be detected, and therefore, there is an inconvenience that when the urging means has an abnormality, the diagnosis of the abnormality of the throttle opening cannot be sufficiently performed.

[0006]

SUMMARY OF THE INVENTION Accordingly, in order to eliminate the above-mentioned disadvantages, the present invention provides a throttle body provided with a throttle valve, a valve operating motor for opening and closing the throttle valve, and a valve operating motor for operating the valve. A biasing means for holding the throttle valve at an intermediate opening when the driving of the motor is stopped and a throttle position sensor for detecting a throttle opening which is an opening state of the throttle valve are provided. A throttle opening diagnostic device that calculates a throttle opening and controls the drive of the valve operating motor so that the throttle valve reaches the target throttle opening, while diagnosing an abnormality in the throttle opening. Later, the valve operating motor is driven, and this valve is operated. When the throttle valve is not at the intermediate opening after stopping the drive of the motor for operating the valve, control means provided with an abnormality determination circuit for determining that the urging means is abnormal is provided. I do.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention provides a method for driving a valve operating motor after an ignition switch is turned off, and for stopping a driving of the valve operating motor when the throttle valve is not at an intermediate opening. Since the abnormality of the urging means is determined, the structure can be simplified, the abnormality of the urging means can be reliably detected, and the abnormality of the throttle opening can be promptly and appropriately diagnosed.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram showing an embodiment of the present invention; 1 to 5 show a first embodiment of the present invention. In FIG. 3, 2 is an engine mounted on a vehicle (not shown), 4 is a cylinder block,
6 is a cylinder head, 8 is an intake manifold, 10 is an intake passage, 12 is a surge tank, 14 is a throttle body, 16 is an intake pipe, and 18 is an air cleaner. The engine 2 is provided with an electronically controlled throttle system 20.

A fuel injection valve 22 is attached to the intake manifold 8 near the cylinder head 6, and a cooling water passage 24 is formed.

The surge tank 12 is provided with one end of a pressure introducing pipe 26 connected thereto. This pressure introduction pipe 26
A pressure sensor 28 for detecting the intake pipe pressure is attached to the other end of the pressure sensor.

In the throttle body 14, FIG.
As shown in FIG. 5, one end of a valve shaft 34 having a throttle valve 32 attached to the case 30 is rotatably provided.
A valve operating motor 38 is connected to the other end of the valve shaft 34 via a gear mechanism 36.

The gear mechanism 36 includes a valve gear 40 fixed to the other end of the valve shaft 34, a motor gear 44 fixed to the distal end of the motor shaft 42 of the valve operating motor 38, a valve shaft 34 and the valve operating motor 38. Case part 30 between
A valve-side intermediate gear 48 fixed to the intermediate shaft 46 and meshed with the valve gear 40; and a motor-side intermediate gear 50 fixed to the intermediate shaft 46 and meshed with the motor gear 44.

The throttle body 14 has a biasing means 52 so as to maintain the throttle valve 32 at an intermediate opening (default opening: α ^o ) when the drive of the valve operating motor 38 is stopped. Return spring 5
4 and a default (intermediate) spring 56 are provided. The return spring 54 is connected to the throttle valve 3
One end is engaged with the valve shaft 34 and the other end is engaged with the case 30 so as to urge the valve 2 toward the closed side of the intermediate opening. The default spring 56 is
One end is engaged with a fastening flange 58 fixed to the valve shaft 34 so as to bias the throttle valve 32 toward the opening side of the intermediate opening, and the other end is a case portion 30.
Is attached to an attaching pin 60 attached to the second member. Therefore,
When the drive of the valve operating motor 38 is stopped, the throttle valve 32 falls within a predetermined range of the intermediate opening degree due to the balance between the urging force of the return spring 54 toward the closing side and the urging force of the default spring 56 toward the opening side. It is what is held in.

Further, the throttle body 14 is provided with a throttle position sensor 62 for detecting a throttle opening, which is an opening state of the throttle valve 32. The throttle position sensor 62 includes a rotating part 62 a fixed to the valve shaft 34 and a detecting part 62 b fixed to the case 30.

The valve operating motor 38 includes a control unit 64
And is driven by energization (voltage signal) from the control means 64. The control means 64 includes a first control unit (operation control unit) 66 and a second control unit (drive control unit) 68 which communicate with each other.

The first control unit 66 includes a fuel injection valve 22,
Pressure sensor 28 and throttle position sensor 62
A water temperature sensor 70 provided on the intake manifold 8, a distributor 74 of an ignition mechanism 72, a battery 80 via a main switch 76 and a fuse 78, a warning lamp 82 for informing the driver, and a relay 84 connected to the battery 80. , The ignition switch 86 and the accelerator position sensor 88 are in communication. The accelerator position sensor 88 communicates with an accelerator pedal 90, detects a depression state of the accelerator pedal 90, and outputs a signal of the depression state to the first control unit 66.

The first controller 66 includes a timer circuit 6
6a, an opening calculation circuit 66b for calculating a target throttle opening based on a signal indicating a depression state of an accelerator pedal 90 from an accelerator position sensor 88, and an abnormality of the urging means 52 is determined to diagnose an abnormality of the throttle opening. An abnormality determination circuit 66c and a first storage circuit (RAM) 6 for storing the throttle opening, which is a detection signal from the throttle position sensor 62, and the result of the above-described diagnosis of the throttle opening.
6d is provided in a built-in manner.

The valve control motor 38, the throttle position sensor 62, and the relay 84 are connected to the second controller 68.

The second control unit 68 has a built-in second storage circuit (RAM) 68d for storing the throttle opening, which is a detection signal from the throttle position sensor 62, and the result of the above-described diagnosis of the throttle opening. It is provided.

Thus, the first and second control units 66 and 68
The control means 64 comprising the accelerator pedal 90
When the accelerator position sensor 88 detects the depressed state of the accelerator pedal and inputs a signal from the accelerator position sensor 88 to the first control unit 66, the opening calculation circuit 66b of the first control unit 66 calculates the target throttle opening. Then, a signal of the target throttle opening is output to the second control unit 68,
Then, the second control unit 68 operates the valve operating motor 38.
And the throttle valve 32 is opened and closed to achieve the target throttle opening, thereby controlling the engine output. On the other hand, the throttle position sensor 62 detects the throttle opening of the throttle valve 32 and detects the throttle opening. The first and second control units 66, 68
Output to

In the control means 64, after the ignition switch 86 is turned off, the valve operating motor 38 is turned on.
When the throttle valve 32 is not at the intermediate opening after stopping the driving of the valve operating motor 38, the urging means 52 is determined to be abnormal, and at this time, the valve operating motor 38 The drive / stop is repeated a plurality of times to determine whether the urging means 52 is abnormal.

Next, the operation of the first embodiment will be described with reference to the flowchart of FIG. 1 and the time chart of FIG.

In the control means 64, when the program starts and the ignition switch 86 is turned off to stop the engine 2 (step 102) (shown in FIG. 2A), power is supplied to the control means 64. Therefore, the timer circuit 66a starts (step 10).
4), and sets a target throttle opening value theta _A of fully closed the throttle valve 32 (step 106).

When the second controller 68 energizes the valve operating motor 38, that is, outputs a voltage signal (minus side), the valve operating motor 38 is driven to rotate the throttle valve 32 to the closing side. (Step 10
8). When the ignition switch 86 is turned off (shown by a in FIG. 2), the throttle valve 32 is gradually turned to the closing side by the drive of the valve operating motor 38, and when the ignition switch 86 is turned off (a in FIG. 2). When a predetermined time t ₁ has passed since shown) by (indicated by b in FIG. 2), the fully closed state.

At this time, the throttle position sensor 6
Actual reads the throttle opening theta ₁ of fully closed the throttle valve 32 is a detection signal from the 2 (Step 11
0), the actual throttle opening theta ₁ of the fully closed and the first throttle opening value .theta.a (step 112).

The relationship between the throttle fully closed side normal determination threshold value A, the above-described first throttle opening value θa, and the above-described fully closed side target throttle opening value θ _A is expressed as | θ _A −
It is determined whether or not θa | ≦ A (step 114).

If step 114 is NO, the process returns to step 108 to continue driving the valve actuation motor 38 (in FIG. 2, a fixed time t ₁ between a and b and a time between b and c). shown at a fixed time t ₂ between).

On the other hand, if step 114 is YES, the drive of the valve operating motor 38 is stopped (step 116) (shown by c in FIG. 2). When the drive of the valve operating motor 38 is stopped in this way, the throttle valve 32 gradually returns to the open side due to the urging forces of the return spring 54 and the default spring 56, and the return spring 54 and the default spring 56 become abnormal. If the return spring 54 and the default spring 56 are abnormal, the throttle valve 32 is opened when the throttle valve 32 is opened. Not within the predetermined range of degrees.

While the driving of the valve operating motor 38 is stopped, the actual throttle opening θ ₂ on the intermediate opening side of the throttle valve 32 is read from the throttle position sensor 62 (step 118). The actual throttle opening θ ₂ on the degree side is changed to the second throttle opening value θ
b (step 120).

The relationship among the first default opening normality determination threshold value B, the second throttle opening value θb, and the default opening value θ _B corresponding to the intermediate opening (α ^o ) is as follows. It is determined whether or not | θ _B −θb | ≦ B (step 1
22). Here, there is a relationship of 0 ≦ target throttle opening value (θ _A ) <default opening value (θ _B ) = intermediate opening (α ^o ) on the fully closed side. Also, the target throttle opening value (θ _A ) on the fully closed side may be fully closed (0 ^° ). Further, the throttle fully closed side normal judgment threshold value A and the first default opening normality judgment threshold value B are within 1 ^° of the opening.

[0031] When the determination in step 122 is NO, returns to step 118 (indicated by a certain time t ₃ of between c of FIG. 2 d) continuing the reading of the throttle opening.

On the other hand, step 122 is YES, the throttle opening state is determined whether a predetermined time (indicated by a predetermined time t ₄ of between d of FIG. 2 e) (Step 124) .

If this step 124 is YES,
It is determined that the return spring 54 and the default spring 56 are normal (step 126).

On the other hand, if step 124 is NO,
It is determined that the return spring 54 and the default spring 56 are abnormal (step 128).

When these determinations have been completed, the program ends (step 130).

The result of the determination of the abnormality of the urging means 52 is stored in the first and second storage circuits 66d and 68d of the first and second controllers 66 and 68.

If the urging means 52 is abnormal in the above judgment, the result is read at the next start of the engine 2 and the driver is informed by a warning lamp 82.

As a result, when the drive of the valve operating motor 38 is stopped within a predetermined time after the engine 2 is stopped,
Using the biasing force of the return spring 54 and the default spring 56 to bring the throttle valve 32 to an intermediate opening (α ^o : default opening), and to drive and stop the valve operating motor 38 a plurality of times. Thereby, the abnormality of the return spring 54 and the default spring 56 can be detected in a short time, and
Diagnosis of an abnormality in the throttle opening can be easily performed.

Further, the urging means 5 does not need to add any parts.
Since the abnormality of No. 2 can be determined, the number of parts can be reduced, the configuration is simple, maintenance and inspection are easy, and the cost can be reduced.

FIGS. 6 and 7 show a second embodiment of the present invention.

In the second embodiment, portions having the same functions as those in the first embodiment will be described with the same reference numerals.

The features of the second embodiment are as follows. That is, in the control means 64, after the ignition switch 86 is turned off, the valve operating motor 3 is turned off.
8 is repeated a plurality of times, and during the repetition of the driving and stopping of the valve operating motor 38, the valve is operated so that the throttle valve 32 is operated both on the closing side and the opening side of the intermediate opening. The drive of the drive motor 38 is controlled.

The operation of the second embodiment will be described with reference to the flowchart of FIG. 6 and the time chart of FIG.

In the control means 64, when the program starts and the ignition switch 86 is turned off to stop the engine 2 (step 202) (shown in FIG. 7A), power is supplied to the control means 64. Therefore, the timer circuit 66a starts (step 20).
4), and sets a target throttle opening value theta _A of fully closed the throttle valve 32 (step 206).

When the second control section 68 energizes the valve operating motor 38, that is, outputs a voltage signal (minus side), the valve operating motor 38 is driven to rotate the throttle valve 32 to the closing side. (Step 20
8). When the ignition switch 86 is turned off (shown by a in FIG. 7), the throttle valve 32 is gradually turned to the closing side by the driving of the valve operating motor 38, and when the ignition switch 86 is turned off (see FIG. 7a). When a predetermined time t ₁ has passed since shown) (indicated by b in FIG. 7), the fully closed state.

At this time, the throttle position sensor 6
Actual reads the throttle opening theta ₁ of fully closed the throttle valve 32 is a detection signal from the 2 (Step 21
0), the actual throttle opening theta ₁ of the fully closed and the first throttle opening value .theta.a (step 212).

[0047] Then, the throttle fully closed normal determination threshold A, the first throttle opening value θa described above, the relationship between the target throttle opening value theta _A of fully closed above, | theta _A - [theta]
It is determined whether a | ≦ A (step 214).

If the determination in step 214 is NO, the process returns to step 208, and the drive of the valve operating motor 38 is continued (in FIG. 7, a predetermined time t ₁ between a and b and a time between b and c). shown at a fixed time t ₂ between).

On the other hand, if step 214 is YES, the drive of the valve operating motor 38 is stopped (step 216) (shown in FIG. 7c). When the drive of the valve operating motor 38 is stopped in this way, the throttle valve 32 gradually returns to the open side due to the urging forces of the return spring 54 and the default spring 56, and the return spring 54 and the default spring 56 become abnormal. If the return spring 54 and the default spring 56 are abnormal, the throttle valve 32 is opened when the throttle valve 32 is in the intermediate open position. Not within the predetermined range of degrees.

While the driving of the valve operating motor 38 is stopped, the actual throttle opening θ ₂ on the intermediate opening side of the throttle valve 32 is read from the throttle position sensor 62 (step 218). The actual throttle opening θ ₂ on the degree side is changed to the second throttle opening value θ
b (step 220).

Then, the relationship between the first default opening normality determination threshold value B, the second throttle opening value θb, and the default opening value θ _B corresponding to the intermediate opening (α ^o ). Is determined whether or not | θ _B −θb | ≦ B (step 222). Here, 0 ≦ target throttle opening value on the fully closed side (θ _A ) <default opening value (θ _B ) = intermediate opening (α)
^o ) There is a relationship. The target throttle opening (θ _A ) on the fully closed side may be fully closed (0 ^° ). Further, the throttle fully closed side normal judgment threshold value A and the first default opening normality judgment threshold value B are within 1 ^° of the opening.

[0052] When the determination in step 222 is NO, returns to step 218 (indicated by a certain time t ₃ of between c of FIG. 7 d) continuing the reading of the throttle opening.

In order to check whether the throttle opening of the throttle valve 32 is stable, a predetermined time t ₄
(Shown between d and e in FIG. 7).

On the other hand, if the determination in step 222 is YES, the second control section 68 energizes the valve operating motor 38 again, that is, outputs a voltage signal (positive side), and the valve operating motor 38 is driven. and gradually next movement to the open side of the throttle valve 32, the throttle opening becomes gradually larger (step 224) (shown by a certain time t ₅ between e in FIG. 7 of f).

Then, when the drive of the valve operating motor 38 is stopped (step 226) (shown by f in FIG. 7), the respective biasing forces of the return spring 54 and the default spring 56 move the throttle valve 32 to the closing side. Gradual return (indicated by a fixed time t ₆ between f and g in FIG. 7),
If there is no abnormality in the return spring 54 or the default spring 56, it is within the predetermined range of the intermediate opening degree finally (shown by g in FIG. 7), but there is an abnormality in the return spring 54 or the default spring 56. The throttle valve 32 is not within the predetermined range of the intermediate opening.

At this time, the throttle position sensor 6
The actual throttle opening θ ₃ on the side where the intermediate opening of the throttle valve 32 is opened from step ₂ is read (step 228),
The actual throttle opening theta ₃ of the opening side and the third throttle opening value [theta] d (step 230).

[0057] Then, a second default opening normal determination threshold value D, a third throttle opening value θd above, the relationship between the default opening value theta _B described above, | θ _B -θd | ≦ D
It is determined whether or not this is the case (step 232).

If this step 232 is NO, the process returns to step 228 and the reading of the throttle opening is continued.

On the other hand, if step 232 is YES, the relationship between the third default opening normality determination threshold value E, the above-described second throttle opening value θb, and the above-described third throttle opening value θd is determined. Is determined whether or not | θb−θd | ≦ E (step 234). Here, the second and third default opening normality determination thresholds D and E may be the same value, and the opening is within about 1 ^° .

If this step 234 is YES,
It is determined whether or not the throttle opening state is within a certain time (a certain time t7 between g and h in FIG. ₇ ) (step 23).
6).

If this step 236 is YES,
It is determined that the return spring 54 and the default spring 56 are normal (step 238).

On the other hand, if step 236 is NO,
It is determined that the return spring 54 and the default spring 56 are abnormal (step 240).

When these determinations are completed, the program ends (step 242).

Further, the result of this determination is stored in the first and second storage circuits 66d and 68d of the first and second controllers 66 and 68.

Next, when there is an abnormality, the result is read when the next engine 2 is started, and the driver is notified by a warning lamp 82.

According to the second embodiment, the same effects as those of the first embodiment can be obtained, and the valve operating motor 38 can be used.
The throttle valve 32 is operated both on the closing side and on the opening side during the repetition of the driving and stopping of the urging means 5.
2 can be more effectively and reliably determined.

In the above-described embodiment, regardless of the number and structure of the return springs 54 and the default springs 56, the present invention can be applied to all electronically controlled throttle systems. The abnormality of the default spring 56 can be similarly determined before the engine 2 is started.

[0068]

As apparent from the above detailed description, according to the present invention, after the ignition switch is turned off, the valve operating motor is driven, and after the valve operating motor is stopped, the throttle valve is turned to the intermediate opening degree. If there is no control means provided with an abnormality determination circuit that determines that the urging means is abnormal when the urging means is abnormal, the structure is simplified, and abnormality of the urging means is reliably detected, and the throttle Diagnosis of the abnormality of the opening can be promptly and appropriately performed.

[Brief description of the drawings]

FIG. 1 is a flowchart of a diagnosis of a throttle opening abnormality in a first embodiment.

FIG. 2 is a time chart for diagnosing a throttle opening abnormality in the first embodiment.

FIG. 3 is a system configuration diagram of a throttle system.

FIG. 4 is a sectional view of a throttle body.

FIG. 5 is a side view of the throttle body shown in FIG. 4;

FIG. 6 is a flowchart for diagnosing a throttle opening abnormality in the second embodiment.

FIG. 7 is a time chart for diagnosing a throttle opening abnormality in the second embodiment.

[Explanation of symbols]

 2 Engine 14 Throttle body 32 Throttle valve 36 Gear mechanism 52 Energizing means 54 Return spring 56 Default spring 62 Throttle position sensor 64 Control means 66 First control unit 68 Second control unit 82 Warning lamp 86 Ignition switch 88 Accel position sensor 90 Accelerator pedal

Claims (3)

[Claims] A throttle body provided with a throttle valve, a valve operating motor for opening and closing the throttle valve, and a bias for holding the throttle valve at an intermediate opening when the drive of the valve operating motor is stopped. Means and a throttle position sensor for detecting a throttle opening, which is an opening state of the throttle valve, so that a target throttle opening is calculated based on a depression state of an accelerator pedal, and the throttle valve is set to the target throttle opening. In the throttle opening diagnostic device for diagnosing an abnormality in the throttle opening while controlling the drive of the valve operating motor, the valve operating motor is driven after the ignition switch is turned off, and the driving of the valve operating motor is stopped. After the throttle valve A throttle opening diagnostic device comprising a control unit provided with an abnormality determination circuit for determining that the urging unit is abnormal when the opening is not at the opening. 2. The control device according to claim 1, wherein after the ignition switch is turned off, driving and stopping of the valve operating motor are repeated a plurality of times, and the abnormality determination circuit determines an abnormality of the urging unit. The throttle opening diagnostic device according to claim 1. 3. The control means repeats driving and stopping of the valve operating motor a plurality of times after the ignition switch is turned off, and controls the throttle valve while the driving and stopping of the valve operating motor is repeated. The throttle opening diagnostic device according to claim 1, wherein the valve operating motor is drive-controlled so as to operate both the closing side and the opening side of the intermediate opening.