GB2499893A - Electronically controlled throttle defect diagnosis - Google Patents
Electronically controlled throttle defect diagnosis Download PDFInfo
- Publication number
- GB2499893A GB2499893A GB1302106.8A GB201302106A GB2499893A GB 2499893 A GB2499893 A GB 2499893A GB 201302106 A GB201302106 A GB 201302106A GB 2499893 A GB2499893 A GB 2499893A
- Authority
- GB
- United Kingdom
- Prior art keywords
- opening degree
- throttle valve
- diagnosis
- electronically controlled
- predetermined time
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000003745 diagnosis Methods 0.000 title claims abstract description 126
- 230000007547 defect Effects 0.000 title claims abstract description 21
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 7
- 238000000034 method Methods 0.000 description 67
- 230000005856 abnormality Effects 0.000 description 12
- 230000007423 decrease Effects 0.000 description 9
- 239000003921 oil Substances 0.000 description 6
- 239000003981 vehicle Substances 0.000 description 6
- 239000000470 constituent Substances 0.000 description 3
- 235000014593 oils and fats Nutrition 0.000 description 3
- 239000000498 cooling water Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 102100037009 Filaggrin-2 Human genes 0.000 description 1
- 101000878281 Homo sapiens Filaggrin-2 Proteins 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 239000004519 grease Substances 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
- F02D11/107—Safety-related aspects
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
- F02D11/106—Detection of demand or actuation
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D11/00—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated
- F02D11/06—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance
- F02D11/10—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type
- F02D2011/101—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles
- F02D2011/102—Arrangements for, or adaptations to, non-automatic engine control initiation means, e.g. operator initiated characterised by non-mechanical control linkages, e.g. fluid control linkages or by control linkages with power drive or assistance of the electric type characterised by the means for actuating the throttles at least one throttle being moved only by an electric actuator
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Abstract
An electronically controlled throttle device, eg in a motorcycle, comprises a throttle valve 21 which is opened or closed by a motor 23 via a gear 22 and is urged in the closing direction by a return spring 24. To diagnose a defect in the throttle device, a diagnosis unit 83a in the ECU 8 sets a target diagnosis opening degree of the throttle valve, drives the motor 23 and discriminates whether the sensed opening degree matches the diagnosis opening degree after a first predetermined time has passed. The diagnosis unit 83a then interrupts driving of the motor 23 to close the throttle valve fully by the force of the return spring 24 and discriminates whether the opening degree of the throttle valve matches a second diagnosis opening degree after a second predetermined time has passed, thereby enabling diagnosis of a defect in the return spring. The diagnosis unit calculates and sets the first and second predetermined times based on a state of the electronically controlled throttle device, eg ambient temperature, engine water and oil temperatures and (for the first predetermined time) the driving voltage of the motor 23.
Description
ELECTRONICALLY CONTROLLED THROTTLE DEVICE
BACKGROUND OF THE INVENTION
The present invention relates to an electronically controlled throttle device, and more particularly relates to an electronically controlled throttle device that performs feedback control on an opening degree of a throttle valve to a target opening degree by drive-controlling an actuator so that a driving force of the actuator resists an urging force of a return spring.
In recent years, there has been proposed an electronically controlled throttle device that includes an actuator that opens and closes a throttle valve and a return spring that urges the throttle valve in a fully closing direction, and performs feedback control on an opening degree of the throttle valve to a target opening degree by drive-controlling the actuator so that a driving force of the actuator resists an urging force of a return spring.
As a configuration for diagnosing an abnormality of such an electronically controlled throttle device, there are configurations disclosed in Japanese Patent Application Laid-open No. H11-190230 and Japanese Patent Application Laid-open No. 2011-7115.
The invention disclosed in Japanese Patent Application Laid-open No. H11-190230 relates to a throttle-valve control device of an engine and a throttle-valve control method thereof, and the invention specifically proposes a configuration in which a defect of a return spring is diagnosed by interrupting energization of power to an actuator after having opened a throttle valve to a diagnosis opening degree in a state where the engine is shut down, and detecting a returned state of the throttle valve after
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a predetermined time has passed since interruption of the energization.
However, according to the abnormality diagnosis method described in Japanese Patent Application Laid-open No. H11-190230, when the urging force of the return spring is not sufficient, it is conceivable that even if the return spring is normal, the throttle valve does not perform an original return operation, and as a result the accuracy of abnormality diagnosis may decrease.
In connection to the above problems, the invention disclosed in Japanese Patent Application Laid-open No. 2011-7115 relates to a throttle control device of an internal combustion engine, and the invention specifically proposes a configuration in which a defect of a return spring is diagnosed by drive-controlling a throttle valve in an opening direction and judging whether an opening degree of the throttle valve converges in a predetermined diagnosis opening degree after a predetermined time has passed.
SUMMARY OF THE INVENTION
According to the consideration by the present inventors, in the configuration of Japanese Patent Application Laid-open No. H11-190230, when the urging force of the return spring is not sufficient, it is conceivable that even if the return spring is normal, the throttle valve does not perform an original return operation, and as a result the accuracy of the abnormality diagnosis may decrease. However, in the configuration of Japanese Patent Application Laid-open No. 2011-7115, the throttle valve is once drive-controlled in the opening direction, and thus it can be said that the invention overcomes such a technical problem that the accuracy of the abnormality diagnosis decreases, which is assumed in the configuration of Japanese Patent Application Laid-open No. H11-190230.
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However, in the configurations disclosed in Japanese Patent Application Laid-open Nos. H11-190230 and 2011-7115, a predetermined time until diagnosis is performed is set to a predetermined fixed value, specifically, a sufficient time for the opening degree of the throttle valve to converge in an opening degree (an initial opening degree) at the time of interrupting a driving force of the actuator or a predetermined diagnosis opening degree. Therefore, according to the abnormality diagnosis methods described in Japanese Patent Application Laid-open Nos. H11-190230 and 2011-7115, it is conceivable that a time more than necessary is consumed for defect diagnosis of the return spring. Furthermore, particularly when the abnormality diagnosis is performed before startup of the engine, a much time is consumed before the startup of the engine, and thus it is conceivable that the startup performance of the engine may decrease.
Further, according to the consideration by the present inventors, to overcome such problems, a method of simply reducing a predetermined time until diagnosis is performed can be considered. However, if the predetermined time until the diagnosis is performed is reduced, although the throttle valve is being operated toward the initial opening degree or the predetermined diagnosis opening degree, an erroneous judgment may be made such that the opening degree of the throttle valve has not converged in the initial opening degree or in the predetermined diagnosis opening degree.
The present invention has been achieved in view of the above problems, and an object of the present invention is to provide an electronically controlled throttle device that can suppress erroneous diagnosis of a defect of a return spring, while improving startup performance of an engine.
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To achieve the above object, a first aspect of the present invention is to provide an electronically controlled throttle device comprising: an actuator that drives a throttle valve; a return spring that urges the throttle valve in a fully closing direction; a throttle opening degree sensor that detects an opening degree of the throttle valve; an accelerator opening degree sensor that detects an indicated opening degree of the throttle valve due to an operation of an accelerator operating member as an accelerator indicated opening degree; and a control device that calculates a target opening degree of the throttle valve based on an accelerator indicated opening degree detected by the accelerator opening degree sensor to perform feedback control on the actuator so that an opening degree of the throttle valve detected by the throttle opening degree sensor matches a calculated target opening degree, wherein the control device includes a diagnosis unit that controls the throttle valve in an opening direction by driving the actuator and discriminates whether the opening degree of the throttle valve converges in a first diagnosis opening degree after a first predetermined time has passed, or interrupts driving of the actuator to drive the throttle valve in a fully closing direction by an urging force of the return spring and discriminates whether the opening degree of the throttle valve converges in a second diagnosis opening degree after a second predetermined time has passed, thereby diagnosing a defect of the return spring, and the diagnosis unit calculates and sets the first predetermined time and the second predetermined time based on a state of the electronically controlled throttle device.
According to a second aspect of the present invention, in addition to the first aspect, the state of the electronically controlled throttle device includes a driving voltage of the actuator, and the diagnosis unit calculates and sets the first predetermined time based on the driving voltage.
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According to a third aspect of the present invention, in addition to the second aspect, the state of the electronically controlled throttle device includes an ambient temperature of the electronically controlled throttle device, and the diagnosis unit calculates and sets the first predetermined time and the second predetermined time based on the ambient temperature.
According to a fourth aspect of the present invention, in addition to the second or third aspect, the ambient temperature of the electronically controlled throttle device is detected by using an engine temperature sensor that detects a temperature of an engine.
In the electronically controlled throttle device according to the first aspect of the present invention, the control device includes the diagnosis unit that controls the throttle valve in the opening direction by driving the actuator and discriminates whether the opening degree of the throttle valve converges in the first diagnosis opening degree after the first predetermined time has passed, or interrupts driving of the actuator to drive the throttle valve in the fully closing direction by an urging force of the return spring and discriminates whether the opening degree of the throttle valve converges in the second diagnosis opening degree after the second predetermined time has passed, thereby diagnosing a defect of the return spring, and the diagnosis unit calculates and sets the first predetermined time and the second predetermined time based on the state of the electronically controlled throttle device. Accordingly, a predetermined time that matches with variation in time until the opening degree of the throttle valve converges in the first or second diagnosis opening degree can be appropriately set depending on the state of the electronically controlled throttle device, and erroneous diagnosis of a defect of the return spring can be suppressed, while improving the startup performance of the
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engine.
In the electronically controlled throttle device according to the second aspect of the present invention, the state of the electronically controlled throttle device includes the driving voltage of the actuator, and the diagnosis unit calculates and sets the first predetermined time based on the driving voltage. Accordingly, the first predetermined time can be set, taking into consideration the variation in time until the opening degree of the throttle valve converges in the first diagnosis opening degree, where the variation is associated with a fluctuation of the driving force of the actuator, and erroneous diagnosis of a defect of the return spring can be suppressed, while improving the startup performance of the engine.
In the electronically controlled throttle device according to the third aspect of the present invention, the state of the electronically controlled throttle device includes the ambient temperature of the electronically controlled throttle device, and the diagnosis unit calculates and sets the first or second predetermined time based on the ambient temperature of the electronically controlled throttle device. Accordingly, the first or second predetermined time can be set, taking into consideration the variation in time until the opening degree of the throttle valve converges in the first or second diagnosis opening degree, where the variation is associated with a fluctuation of the ambient temperature of the electronically controlled throttle device, and erroneous diagnosis of a defect of the return spring can be suppressed, while improving the startup performance of the engine.
In the electronically controlled throttle device according to the fourth aspect of the present invention, the diagnosis unit detects the ambient temperature of the electronically controlled throttle device by using the engine temperature sensor that
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detects a temperature of the engine. Accordingly, the temperature of a throttle valve mechanism inside the electronically controlled throttle device can be detected more accurately at the time of hot restart or the like, and the first or second predetermined time can be set, taking into consideration the variation in time until the opening degree of the throttle valve converges in the first or second diagnosis opening degree, where the variation is associated with a fluctuation of the ambient temperature of the electronically controlled throttle device.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a block diagram showing a configuration of an electronically controlled throttle device according to an embodiment of the present invention;
FIG. 2 is a flowchart showing a flow of a first diagnosis process of the electronically controlled throttle device according to the embodiment; and
FIG. 3 is a timing chart showing a flow of a first diagnosis process and a second diagnosis process of the electronically controlled throttle device according to the embodiment.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
Embodiments of an electronically controlled throttle device according to the present invention will be explained below in detail with reference to the drawings.
[Configuration of electronically controlled throttle device]
First, a configuration of an electronically controlled throttle device according to an embodiment of the present invention is explained in detail with reference to FIG. 1. FIG. 1 is a block diagram showing a configuration of the electronically controlled
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throttle device according to the present embodiment.
As shown in FIG. 1, an electronically controlled throttle device 1 according to the present embodiment is mounted on a vehicle (not shown), typically on a motorcycle, and includes a throttle valve mechanism 2, a throttle opening degree sensor 3, an accelerator opening degree sensor 4, an intake-air temperature sensor 5, a water temperature sensor 6, an oil temperature sensor 7, and an electronic control unit (ECU) 8.
The throttle valve mechanism 2 is arranged in an intake air system of an engine (not shown) of the vehicle, to drive a throttle valve 21 that adjusts an inflow volume of air to the inside of the engine. The throttle valve mechanism 2 includes a motor 23 that opens or closes the throttle valve 21 via a gear 22, and a return spring 24 that urges the throttle valve 21 in a fully closing direction. The gear 22 and the motor 23 function as an actuator that drives the throttle valve 21.
The throttle opening degree sensor 3 detects an opening degree of the throttle valve 21 and outputs an electric signal indicating the detected opening degree to the ECU 8. The accelerator opening degree sensor 4 detects an indicated opening degree of the throttle valve 21 indicated by an operation of an accelerator grip (not shown) as an accelerator indicated opening degree, and outputs an electric signal indicating the detected accelerator indicated opening degree to the ECU 8. The accelerator grip is an accelerator operating member, and a mode thereof is not limited to the grip. For example, when the vehicle is a four-wheel vehicle, the accelerator grip takes a mode of an accelerator pedal.
The intake-air temperature sensor 5 detects an intake air temperature of the engine, and outputs an electric signal indicating the detected intake air temperature to
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the ECU 8. The water temperature sensor 6 detects a temperature of cooling water of the engine, and outputs an electric signal indicating the detected temperature of the cooling water to the ECU 8. The oil temperature sensor 7 detects a temperature of lubricating oil of the engine, and outputs an electric signal indicating the detected temperature of the lubricating oil to the ECU 8.
The ECU 8 is a control unit that operates by using power supplied from a battery B mounted on a vehicle and can control various constituent elements of a vehicle, and includes a memory (not shown) and the like. The ECU 8 includes an actuator drive circuit 82 and a central processing unit (CPU) 83. The actuator drive circuit 82 drives the motor 23. Operations of the actuator drive circuit 82 are controlled by controlling on/off of a relay 81 that connects the battery B and the actuator drive circuit 82 with each other by the CPU 83. The CPU 83 can detect a voltage value (a battery voltage) between the relay 81 and the actuator drive circuit 82 as a driving voltage of the motor 23.
The CPU 83 operates according to a predetermined control program. Specifically, the CPU 83 calculates a target opening degree of the throttle valve 21 based on the accelerator indicated opening degree detected by the accelerator opening degree sensor 4, and performs feedback control on the motor 23 via the actuator drive circuit 82 so that the opening degree of the throttle valve 21 detected by the throttle opening degree sensor 3 matches the calculated target opening degree. The CPU 83 includes a diagnosis unit 83a as a functional block.
[Abnormality diagnosis process]
In the electronically controlled throttle device 1 having such a configuration, the CPU 83 performs an abnormality diagnosis process described below to diagnose a
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defect of the return spring 24.
That is, in the abnormality diagnosis process, the CPU 83 performs a first diagnosis process in which the CPU 83 controls the throttle valve 21 in an opening direction, and discriminates whether the opening degree of the throttle valve 21 converges in a first diagnosis opening degree after a first predetermined time has passed to diagnose a defect of the return spring 24, or performs a second diagnosis process in which the CPU 83 drives the throttle valve 21 in a fully closing direction by an urging force of the return spring 24, and discriminates whether the opening degree of the throttle valve 21 converges in a second diagnosis opening degree after a second predetermined time has passed to diagnose a defect of the return spring 24, thereby diagnosing a defect of the return spring 24. The abnormality diagnosis process is performed before starting a feedback control process of the throttle valve 21 based on the accelerator indicated opening degree. With this configuration, the feedback control process of the throttle valve 21 can be started upon confirming the state in which the return spring 24 is normally operable.
Operations of the CPU 83 at the time of performing the abnormality diagnosis process are explained below with reference to FIGS. 2 and 3. In FIG. 2, operations of the CPU 83 at the time of performing the first diagnosis process are mainly explained for convenience' sake.
FIG. 2 is a flowchart showing a flow of the first diagnosis process of the electronically controlled throttle device according to the present embodiment. FIG. 3 is a timing chart showing a flow of the first diagnosis process and the second diagnosis process of the electronically controlled throttle device according to the present embodiment. The flowchart shown in FIG. 2 is started for each of a predetermined
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control cycle, and the first diagnosis process proceeds to a process in Step S1.
In the process in Step S1, the diagnosis unit 83a of the CPU 83 sets a target opening degree (a signal L1 shown in FIG. 3) of the throttle valve 21 to a first diagnosis opening degree, and drive-controls the motor 23 via the actuator drive circuit 82 so that the opening degree of the throttle valve 21 detected by the throttle opening degree sensor 3 (a signal L2 shown in FIG. 3) matches the first diagnosis opening degree.
With this operation, the process in Step S1 is complete, and the first diagnosis process proceeds to a process in Step S2.
In the process in Step S2, the diagnosis unit 83a of the CPU 83 discriminates whether a value of a first flag FLG1 indicating that the first diagnosis process is in progress is 1, to discriminate whether the first diagnosis process is in progress. As a result of the discrimination, when the value of the first flag FLG1 is 0, the diagnosis unit 83a of the CPU 83 determines that the first diagnosis process is not in progress, and advances the first diagnosis process to a process in Step S3. On the other hand, when the value of the first flag FLG1 is 1, the diagnosis unit 83a of the CPU 83 determines that the first diagnosis process is in progress, and advances the first diagnosis process to a process in Step S5.
In the process in Step S3, the diagnosis unit 83a of the CPU 83 sets the value of the first flag FLG1 to 1, thereby setting that the first diagnosis process is in progress. With this setting, the process in Step S3 is complete, and the first diagnosis process proceeds to a process in Step S4.
In the process in Step S4, the diagnosis unit 83a of the CPU 83 detects a driving voltage of the motor 23, and determines the length of a first predetermined time based on the detected driving voltage of the motor 23. Specifically, if the driving voltage of the
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motor 23 decreases, the time until the opening degree of the throttle valve 21 converges in the first diagnosis opening degree increases. Therefore, the diagnosis unit 83a of the CPU 83 reads data of the first predetermined time corresponding to the driving voltage of the motor 23 from a table set such that the first predetermined time increases corresponding to a decrease of the driving voltage of the motor 23. The diagnosis unit 83a of the CPU 83 then sets a count value of a timer to the determined first predetermined time. The diagnosis unit 83a of the CPU 83 can determine the length of the first predetermined time based on the driving voltage of the motor 23 and the temperatures detected by the intake-air temperature sensor 5, the water temperature sensor 6, and the oil temperature sensor 7, or only based on the temperatures detected by the intake-air temperature sensor 5, the water temperature sensor 6, and the oil temperature sensor 7. Specifically, when the ambient temperature of the electronically controlled throttle device 1 decreases, for example, the viscosity of oils and fats such as grease applied to the throttle valve mechanism 2 increases, and the time until the opening degree of the throttle valve 21 converges in the first diagnosis opening degree increases. Therefore, the diagnosis unit 83a of the CPU 83 reads the data of the first predetermined time corresponding to the driving voltage of the motor 23 from a table set such that the first predetermined time increases corresponding to a decrease of the ambient temperature of the electronically controlled throttle device 1. With this operation, the process in Step S4 is complete, and the first diagnosis process proceeds to a process in Step S5.
In the process in Step S5, the diagnosis unit 83a of the CPU 83 discriminates whether the count value of the timer is 0, thereby discriminating whether the first predetermined time has passed since the opening degree of the throttle valve 21 has
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been controlled to match the first diagnosis opening degree (the time t shown in FIG 3 is t1). As a result of the discrimination, when having discriminated that the count value of the timer is not 0, the diagnosis unit 83a of the CPU 83 determines that the first predetermined time has not passed, and subtracts 1 from the counter value of the timer as a process in Step S6 to finish the series of the first diagnosis process. On the other hand, when having discriminated that the count value of the timer is 0, the diagnosis unit 83a of the CPU 83 determines that the first predetermined time has passed (the time t shown in FIG. 3 is t2), and advances the first diagnosis process to a process in Step S7.
In the process in Step S7, the diagnosis unit 83a of the CPU 83 discriminates whether the opening degree of the throttle valve 21 detected by the throttle opening degree sensor 3 has converged in a predetermined range AW1 (see FIG. 3) including an opening degree around ±a of the first diagnosis opening degree. As a result of the discrimination, when the opening degree of the throttle valve 21 has not converged in the predetermined range AW1, the diagnosis unit 83a of the CPU 83 advances the first diagnosis process to a process in Step S8. On the other hand, if the opening degree of the throttle valve 21 has converged in the predetermined range AW1, the diagnosis unit 83a of the CPU 83 advances the first diagnosis process to a process in Step S9.
In the process in Step S8, the diagnosis unit 83a of the CPU 83 determines that the return spring 24 has a defect, and makes a notification of this information. With this operation, the process in Step S8 is complete, to finish the series of the first diagnosis process.
In the process in Step S9, the diagnosis unit 83a of the CPU 83 determines that the return spring 24 has no defect. With this operation, the process in Step S9 is complete, to finish the series of the first diagnosis process.
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While the above explanation relates to the first diagnosis process, the second diagnosis process can be also performed in the same manner as the first diagnosis process by replacing the first diagnosis opening degree by a second diagnosis opening degree, the first flag FLG1 indicating that the first diagnosis process is in progress by a second flag FLG2 indicating that the second diagnosis process is in progress, the first predetermined time by a second predetermined time, and the predetermined range AW1 including the first diagnosis opening degree by a predetermined range AW2 including the second diagnosis opening degree. Note that, in the second diagnosis process, the CPU 83 determines the length of the second predetermined time only based on the temperatures detected by the intake-air temperature sensor 5, the water temperature sensor 6, and the oil temperature sensor 7. At the time of performing the second diagnosis process, it is preferable that the CPU 83 turns on the relay 81 in a state where the duty ratio is set to 0. This is because when the throttle valve 21 is converged at a fully closed position only by the urging force of the return spring 24, the stress to the gear 22 of the throttle valve mechanism 2 becomes large. By turning on the relay 81 in the state where the duty ratio is set to 0, the motor 23 becomes a resistance against the urging force of the return spring 24, and thus the stress to the gear 22 of the throttle valve mechanism 2 can be alleviated.
In the configuration of the present embodiment of the present invention described above, the CPU 83 drives the actuator drive circuit 82 to control the throttle valve 21 in an opening direction, and discriminates whether the opening degree of the throttle valve 21 converges in the first diagnosis opening degree after the first predetermined time has passed, or drives the throttle valve 21 in the fully closing direction by the urging force of the return spring 24 and discriminates whether the
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opening degree of the throttle valve 21 converges in the second diagnosis opening degree after the second predetermined time has passed, thereby diagnosing a defect of the throttle valve 21. The CPU 83 then calculates and sets the first and second predetermined times based on the state of the electronically controlled throttle device 1. According to this configuration, the first and second predetermined times that match with the variation in time until the opening degree of the throttle valve 21 converges in the first and second diagnosis opening degrees can be appropriately set, thereby enabling to suppress erroneous diagnosis of a defect of the return spring 24, while improving the startup performance of the engine.
Because the CPU 83 calculates and set the first predetermined time based on the driving voltage of the motor 23, the first predetermined time can be set by taking into consideration the variation in a converging time of the throttle valve 21 in the first diagnosis opening degree due to a fluctuation of the driving voltage of the motor 23.
In the electronically controlled throttle device according to the embodiment of the present invention, because the CPU 83 calculates and sets the first and second predetermined times based on the ambient temperature of the electronically controlled throttle device 1, the first and second predetermined times can be set by taking into consideration the variation in the converging time of the throttle valve 21 in the first or second diagnosis opening degree due to a fluctuation of the ambient temperature of the electronically controlled throttle device 1.
The CPU 83 detects the ambient temperature of the electronically controlled throttle device 1 by using the engine temperature sensors (the intake-air temperature sensor 5, the water temperature sensor 6, and the oil temperature sensor 7) that detect the temperature of the engine. Even if the ambient temperature of the electronically
15
controlled throttle device 1 is low, it is not always true that the viscosity of oils and fats applied to the throttle valve mechanism 2 increases. That is, when the engine is in a hot start state, the throttle valve mechanism 2 may be warm. In this case, the viscosity of oils and fats applied to the throttle valve mechanism 2 decreases. Therefore, the state of the throttle valve mechanism 2 can be detected more accurately by detecting the temperature of the engine as the ambient temperature of the electronically controlled throttle device 1.
In the present invention, the types, arrangements, and numbers of constituent elements are not limited to those described in the above embodiment, and it is needless to mention that changes can be appropriately made without departing from the scope of the invention, such as replacing these constituent elements with other elements having equivalent operational effects.
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Claims (4)
1. An electronically controlled throttle device comprising:
an actuator that drives a throttle valve;
a return spring that urges the throttle valve in a fully closing direction;
a throttle opening degree sensor that detects an opening degree of the throttle valve;
an accelerator opening degree sensor that detects an indicated opening degree of the throttle valve due to an operation of an accelerator operating member as an accelerator indicated opening degree; and a control device that calculates a target opening degree of the throttle valve based on an accelerator indicated opening degree detected by the accelerator opening degree sensor to perform feedback control on the actuator so that an opening degree of the throttle valve detected by the throttle opening degree sensor matches a calculated target opening degree, wherein the control device includes a diagnosis unit that controls the throttle valve in an opening direction by driving the actuator and discriminates whether the opening degree of the throttle valve converges in a first diagnosis opening degree after a first predetermined time has passed, or interrupts driving of the actuator to drive the throttle valve in a fully closing direction by an urging force of the return spring and discriminates whether the opening degree of the throttle valve converges in a second diagnosis opening degree after a second predetermined time has passed, thereby diagnosing a defect of the return spring, and the diagnosis unit calculates and sets the first predetermined time and the second predetermined time based on a state of the
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electronically controlled throttle device.
2. The electronically controlled throttle device according to claim 1, wherein the state of the electronically controlled throttle device includes a driving voltage of the actuator, and the diagnosis unit calculates and sets the first predetermined time based on the driving voltage.
3. The electronically controlled throttle device according to claim 1 or 2, wherein the state of the electronically controlled throttle device includes an ambient temperature of the electronically controlled throttle device, and the diagnosis unit calculates and sets the first predetermined time and the second predetermined time based on the ambient temperature.
4. The electronically controlled throttle device according to claim 3, wherein the diagnosis unit detects the ambient temperature of the electronically controlled throttle device by using an engine temperature sensor that detects a temperature of an engine.
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Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2012041820A JP5961403B2 (en) | 2012-02-28 | 2012-02-28 | Electronically controlled throttle device |
Publications (3)
| Publication Number | Publication Date |
|---|---|
| GB201302106D0 GB201302106D0 (en) | 2013-03-20 |
| GB2499893A true GB2499893A (en) | 2013-09-04 |
| GB2499893B GB2499893B (en) | 2018-06-20 |
Family
ID=47843531
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB1300897.4A Ceased GB201300897D0 (en) | 2012-02-28 | 2013-01-18 | Electronically controlled throttle device |
| GB1302106.8A Active GB2499893B (en) | 2012-02-28 | 2013-02-06 | Electronically controlled throttle device |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GBGB1300897.4A Ceased GB201300897D0 (en) | 2012-02-28 | 2013-01-18 | Electronically controlled throttle device |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP5961403B2 (en) |
| DE (1) | DE102013001620B4 (en) |
| GB (2) | GB201300897D0 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108138660A (en) * | 2015-09-25 | 2018-06-08 | 日产自动车株式会社 | Control valve device |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP6613032B2 (en) * | 2015-02-04 | 2019-11-27 | 株式会社ケーヒン | Electronically controlled throttle device |
| JP6725975B2 (en) * | 2015-09-30 | 2020-07-22 | 株式会社ケーヒン | Electronically controlled throttle device |
| JP6553496B2 (en) * | 2015-12-10 | 2019-07-31 | 日立オートモティブシステムズ株式会社 | Electronically controlled throttle device and throttle control method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH11229943A (en) * | 1998-02-13 | 1999-08-24 | Unisia Jecs Corp | Diagnostic device for electronically controlled throttle device |
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|---|---|---|---|---|
| JP2518235B2 (en) * | 1986-12-11 | 1996-07-24 | 日本電装株式会社 | Throttle valve control device for internal combustion engine |
| JP2844792B2 (en) * | 1990-01-29 | 1999-01-06 | 三菱自動車工業株式会社 | Electronically controlled throttle valve drive |
| US5113823A (en) | 1990-04-06 | 1992-05-19 | Nissan Motor Company, Limited | Throttle valve control apparatus for use with internal combustion engine |
| JPH11190230A (en) | 1997-12-25 | 1999-07-13 | Hitachi Ltd | Throttle valve control device of engine and control method |
| JP2004225538A (en) | 2003-01-20 | 2004-08-12 | Mitsubishi Electric Corp | Throttle valve control device |
| JP2011007115A (en) | 2009-06-26 | 2011-01-13 | Denso Corp | Throttle control device of internal combustion engine |
-
2012
- 2012-02-28 JP JP2012041820A patent/JP5961403B2/en active Active
-
2013
- 2013-01-18 GB GBGB1300897.4A patent/GB201300897D0/en not_active Ceased
- 2013-01-30 DE DE102013001620.7A patent/DE102013001620B4/en active Active
- 2013-02-06 GB GB1302106.8A patent/GB2499893B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11229943A (en) * | 1998-02-13 | 1999-08-24 | Unisia Jecs Corp | Diagnostic device for electronically controlled throttle device |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108138660A (en) * | 2015-09-25 | 2018-06-08 | 日产自动车株式会社 | Control valve device |
| EP3354885A4 (en) * | 2015-09-25 | 2019-01-02 | Nissan Motor Co., Ltd. | Valve control device |
| US10513971B2 (en) | 2015-09-25 | 2019-12-24 | Nissan Motor Co., Ltd. | Valve control device |
| CN108138660B (en) * | 2015-09-25 | 2020-12-18 | 日产自动车株式会社 | Valve control device |
Also Published As
| Publication number | Publication date |
|---|---|
| GB201302106D0 (en) | 2013-03-20 |
| DE102013001620A1 (en) | 2013-08-29 |
| JP5961403B2 (en) | 2016-08-02 |
| JP2013177848A (en) | 2013-09-09 |
| GB2499893B (en) | 2018-06-20 |
| GB201300897D0 (en) | 2013-03-06 |
| DE102013001620B4 (en) | 2018-09-13 |
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