JP2004052676A - Throttle valve device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a throttle valve device setting the fully opened position of a throttle valve more accurately. <P>SOLUTION: A maximum value outputted from a position detector of a mechanism for controlling the flow of air in a throttle body of this throttle valve device for controlling the quantity of passing air is stored in a nonvolatile memory element in the throttle valve device. The throttle device has a communication terminal that communicates with the outside. When storing the maximum value in the nonvolatile memory element, in the case of receiving a storage command of the maximum value from the communication terminal, the maximum value is stored in the nonvolatile memory element. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a throttle device for an internal combustion engine. In particular, the present invention relates to a method for learning a fully open position of a throttle of the throttle device.
[0002]
[Prior art]
Japanese Patent Application Laid-Open No. H11-173207 discloses that an accelerator pedal interlocked with a throttle valve is fully depressed at least under specific conditions of vehicle stop and engine stop until an output value from a throttle opening sensor interlocked with an engine throttle valve is fully depressed. A method of setting a full throttle value of a throttle opening provided with a detecting means for detecting the throttle opening state is described.
[0003]
[Problems to be solved by the invention]
In many prior arts, learning of the throttle valve fully closed position and the like is performed each time the ignition key is turned on, and is used as a reference for throttle control. However, learning of the throttle valve fully open position is not performed, and the throttle lower limit value at the throttle valve fully open position is set as the throttle fully open position, and the throttle fully closed position and the throttle fully open position are linearly interpolated to drive the throttle valve. In this method, the throttle valve control position differs from the actual throttle valve position due to variations due to the throttle valve fully open position.
[0004]
An object of the present invention is to provide a throttle valve device in which a throttle valve fully open position is set more accurately.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the present invention, in the throttle device, a non-volatile storage element (such as an EEPROM) for storing a throttle valve fully closed position and a throttle valve fully open position is arranged in the throttle device. Further, the present invention provides a throttle body integrated control device in which the throttle device and the throttle body are integrated. It is also provided that the throttle valve fully open position is learned after assembling the integrated throttle control device, and the learned value of the throttle valve fully open position is stored in the nonvolatile element. Thus, the throttle valve fully closed position and the throttle valve fully open position can be recorded, and linear interpolation can be performed between the positions. Therefore, the actual throttle position, which is the actual position, can be set more accurately at the throttle valve control position viewed from the control side.
[0006]
BEST MODE FOR CARRYING OUT THE INVENTION
First Embodiment A first embodiment describes a throttle body integrated control device for controlling a flow rate of air taken into an internal combustion engine of an automobile or the like.
[0007]
FIG. 1 is a graph showing the relationship between the position of the throttle valve and the absolute error of the air flow rate flowing through the throttle valve. FIG. 2 is a block diagram showing a configuration of the throttle body integrated control device.
[0008]
In the throttle body integrated control device 1 (hereinafter referred to as a throttle device), a throttle body 2 for controlling the flow rate of air taken into the engine includes a throttle valve 3, a motor 4 for driving the throttle valve 3, and an output of the motor 4. An intermediate gear 5 for transmitting power to the throttle valve 3 by decelerating the throttle valve, a throttle sensor 6 for detecting a throttle position opening degree, a fully closed stopper 7 for mechanically setting the throttle valve 3 to a fully closed position, and a throttle valve. A full-open stopper 8 is disposed to prevent the mechanical opening of the valve 3 mechanically from the fully open position. FIG. 3 is a cross-sectional view of the throttle body 2. The operating width of the throttle valve 3 is between a fully closed stopper 7 and a fully opened stopper 8. Generally, when the throttle valve 3 is controlled to a fully open point at an angle at which the air flow rate flowing through the throttle body 2 is maximized, that is, when the throttle valve 3 overshoots, the throttle valve 3 Collide with the fully open stopper 8 and hunting occurs near the fully open point. Therefore, an angle larger than 90 ° from the fully closed point of the throttle valve 3 is set.
[0009]
A throttle device 9 in which a control semiconductor is disposed is disposed in the throttle body integrated control device 1. In the throttle device 9, a CPU 10 for controlling the throttle valve 3, a driver 11 for driving the motor 4, and an engine A communication terminal I12 for performing communication with the control device is arranged. The CPU 10 controls the driver 11 such that the opening degree of the throttle valve 3 is controlled so that the instruction opening degree output from the internal combustion engine control device through communication or the like and the actual opening degree position of the throttle valve 3 output from the throttle sensor 6 match. Then, the throttle valve opening is controlled. The reference of the actual throttle valve opening position is to drive the throttle valve 3 in the fully closed direction, learn the position stopped by the fully closed stopper 7, use the throttle valve fully closed position as a reference point, and set the throttle fully open position to the throttle position. The lower limit of the variation is set in consideration of the variation of the body 2 and the variation of the throttle sensor 6. That is, if the lower limit value in consideration of each variation is set to the throttle valve fully open position, it is possible to prevent the throttle body 2 having the upper limit value due to each variation from colliding with the fully open stopper 8.
[0010]
Here, the control of the throttle valve 3 is controlled by a value obtained by linearly interpolating the fully closed position and the fully open position of the throttle valve 3, that is, based on the indicated throttle valve opening 13 output from the internal combustion engine control device. The throttle valve 3 is controlled so as to coincide with the throttle valve position obtained by the linear interpolation. However, since the throttle valve fully open position is the lower limit value of the fully open position in consideration of the variation of the throttle body 2 and the throttle sensor 6, etc., the throttle valve fully open position may be completely equal to the instruction opening 13 transmitted from the internal combustion engine control device. was difficult. Further, the learning of the throttle valve fully closed position, which serves as the throttle valve actual opening position reference point, can be performed every time the internal combustion engine starts operating. When the throttle valve 3 is operating in the fully closed direction, the internal combustion engine speed tends to decrease (the internal combustion engine may stop). However, the learning of the throttle valve fully open position in a state where the throttle body integrated control device 1 is attached to the internal combustion engine cannot perform the learning of the throttle fully open position because the engine speed tends to increase.
[0011]
A first embodiment for solving the above problem will be described with reference to FIG. FIG. 4 is a block diagram of the throttle device 9. In the conventional throttle control device shown in FIG. 2, a non-volatile storage element 14 (hereinafter, referred to as an EEPROM) for storing a throttle position full open value is arranged. . The CPU 10 reads the maximum value of the throttle sensor 6, that is, the value at which the air flow rate flowing through the throttle body becomes the maximum, and writes the value into the EEPROM 14, that is, learns the throttle valve position fully open. After the learning of the throttle valve position fully open, when the throttle body integrated control device 1 is attached to the internal combustion engine and the throttle body integrated control device 1 is actually operated, the CPU 10 of the throttle body integrated control device 1 The throttle valve fully closed learning is performed, and the throttle valve position fully open value is read from the throttle valve position fully open learned value stored in the EEPROM 14, and the throttle valve position fully closed learned value and the throttle valve position fully open learned value are calculated. The throttle valve 3 is controlled such that the commanded opening transmitted from the internal combustion engine control device and the value obtained by the linear interpolation match each other. As a result, it is possible to make the command opening 13 from the internal combustion engine control device and the actual throttle valve opening match. Further, since the throttle valve position fully open learning value is stored in the EEPROM 14 for each throttle body integrated control device 1, the variation of each throttle body integrated control device 1 and the variation by the throttle body integrated control device 1 are compensated. It is possible to do.
[0012]
For example, the throttle sensor output value of the throttle valve position fully open value of the throttle body integrated control device 1 is 4V, and the throttle sensor output value of the throttle valve position of the throttle body 2 fully open value is 4.1V. In the conventional throttle control device, the lower limit value of the two throttle valve position fully open values, that is, 4V of the sensor output value of the throttle body integrated control device 1 is set as the throttle valve fully open position. However, according to this embodiment, since the throttle valve position is fully opened individually, even if there is a variation in each throttle valve, as shown in FIG. Can be compensated for.
[0013]
Furthermore, for example, the throttle sensor output value of the throttle valve position fully closed value is set to 0.5 V, and the throttle body 2 expands the usable range of the throttle sensor with respect to the throttle body integrated control device 1, that is, Assuming that the AD conversion rate of the CPU is 1 count / 0.005V, the fully open AD value of the throttle body integrated control device 1 is 3.5V ÷ 0.005V = 700 counts. Similarly, the throttle body 2 has a 3.6V ÷ 0.005V = 720 counts, and the resolution of the sensor can be increased.
[0014]
A second embodiment will be described with reference to FIG. The second embodiment has a communication terminal II15 for receiving the throttle valve position fully open learning command of the first embodiment. For example, when carrying out the learning of the throttle valve position full opening, it is necessary to perform the setting of the throttle valve 3 so that the air flow rate flowing through the throttle body is maximized. After the throttle valve 3 is set, the communication terminal II15 is used. Only when the throttle valve position fully open learning command is received, the data is written to the nonvolatile memory element 14. Furthermore, it is also possible to implement using the communication terminal I12.
[0015]
A third embodiment will be described with reference to FIG. In the third embodiment, as a method for setting the flow rate of air flowing through the throttle body to be maximum before receiving the throttle valve position full opening learning instruction of the second embodiment, for example, the throttle valve position is fully opened. The throttle valve 3 is set using a jig. For example, the learning of the throttle valve position fully closed can be performed by pressing the fully closed stopper 7 without using a jig because the fully closed stopper 7 is provided. However, in the learning of the throttle valve position fully open, the fully open stopper 8 is not at the throttle valve position where the air flow rate flowing through the throttle body is the maximum, and therefore, if the jig is not used, the throttle valve position fully open point will vary. Therefore, it is necessary to perform the learning of the throttle valve position fully open using a jig.
[0016]
A fourth embodiment will be described with reference to FIG. FIG. 8 shows a learning flow of the throttle valve position fully open. As shown in FIG. 8, the learning of the throttle valve position fully open is performed at the angle at which the air flow rate flowing through the throttle body becomes maximum immediately after assembling the throttle body integrated control device 1 or simultaneously with the test of the throttle body integrated control device 1, that is, Using the jig described in the third embodiment, the throttle valve 3 is fixed to the throttle valve position fully open point, and the throttle valve position fully open learning is performed. According to this embodiment, since the throttle body integrated control device 1 is integrated with the throttle body, when the throttle body 2 and the throttle device 9 are not integrated as in the conventional throttle control device, the throttle valve is not provided. The position full-open learning can be performed only when the throttle body and the throttle control device are attached to the internal combustion engine. However, if the throttle body integrated control device 1 is used, as described above, the throttle body integrated control device 1 This can be performed immediately after assembly. When mounted on the internal combustion engine, a malfunction due to learning of the throttle valve position fully open can be prevented. Further, it is possible to avoid the inconvenience of learning the throttle valve position fully open when the internal combustion engine is installed.
[0017]
According to the embodiment described above, as described above, the throttle valve is linearly interpolated and controlled from the fully closed position to the fully open position with respect to the throttle valve instruction opening transmitted from the internal combustion engine control device. The indicated throttle valve opening and the actual throttle valve opening can be matched.
[0018]
Further, the throttle valve position fully open learning time can be set after setting the throttle valve position fully open point.
[0019]
Further, according to the embodiment, the variation of the throttle valve position fully open point can be eliminated, and the fully open point can be set to one point.
[0020]
In the above embodiment, an example is shown in which the non-volatile memory is integrated with the throttle device. However, the non-volatile memory is a separately mounted unit (for example, an engine control unit, a microcomputer of another control device). ) May be provided. That is, it is only required that the contents in the nonvolatile memory be electrically connected so that the throttle device can refer to the contents.
[0021]
In addition, a nonvolatile memory element that records the output value of the throttle sensor when the throttle valve is rotated to the end opposite to the fully closed position is provided, and the nonvolatile memory element and the control circuit are electrically connected. . Thus, the rotation range of the throttle valve can be stored. Thus, since the output of the throttle sensor corresponding to the end point when the throttle valve is fully opened is known, the throttle valve can be brought to the fully open position.
[0022]
Further, the nonvolatile recording element is attached to the throttle valve device. Thus, before the throttle valve device is attached to the engine, for example, at the time of factory shipment, the fully open position of the throttle valve can be stored in the individual throttle valve. Thus, the full open position can be stored without detecting the full open position every time the power of the throttle valve device is turned on.
[0023]
The position of the throttle valve when no current is flowing through the motor is a position between the fully closed position and the terminal position on the opposite side. Thus, it is possible to prevent the throttle valve from biting on the wall of the air passage when the power of the throttle valve control device is turned off. Further, by turning on the power, the actuator is moved to the fully closed position, and by detecting the output of the throttle sensor at the fully closed position, the output difference of the sensor output due to temperature or the like can be corrected. As a result, a more accurate fully closed position can be learned, and the output value of the throttle sensor at each opening of the throttle valve can be calculated more accurately with the value stored in the nonvolatile storage element.
[0024]
The control device is connected to a terminal for inputting and outputting a signal to and from the outside of the throttle valve device, and by rotating the shaft based on a signal from the portion, the position of the throttle valve is sequentially transmitted to an external control device. You can give feedback. Thereby, the required amount of air can be passed more accurately.
[0025]
【The invention's effect】
According to the present invention, it is possible to provide a throttle valve device in which the throttle valve fully open position is set more accurately.
[Brief description of the drawings]
FIG. 1 is a diagram showing a relationship between an air flow rate and a throttle opening degree of a throttle device.
FIG. 2 is a configuration block diagram of a throttle body integrated control device.
FIG. 3 is a sectional view of a throttle body.
FIG. 4 is a configuration block diagram of a first throttle body integrated control device of the present embodiment.
FIG. 5 is a diagram showing the relationship between the throttle opening and the air flow rate in the first throttle device of the embodiment.
FIG. 6 is a block diagram showing a configuration of a second throttle body integrated control device according to the embodiment;
FIG. 7 is a relationship diagram of a third throttle valve according to the present embodiment.
FIG. 8 is a flowchart of a fourth embodiment of the present invention in which a throttle valve position is fully opened.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Throttle body integrated control device, 2 ... Throttle body, 3 ... Throttle valve, 4 ... Motor, 5 ... Intermediate gear, 6 ... Throttle sensor, 7 ... Fully closed stopper, 8 ... Fully open stopper, 9 ... Throttle device, 10 ... CPU, 11 ... driver,
12: Communication terminal I, 13: Throttle instruction opening, 14: Non-volatile storage element, 15: Communication terminal II, 16: Jig for fully opening throttle valve position.

Claims (9)

A maximum value output from a position detecting device of a mechanism for controlling an air flow rate in a throttle body of a throttle valve device for controlling an amount of air passing therethrough is stored in a nonvolatile storage element in the throttle valve device. And the throttle valve device. 2. The throttle valve device according to claim 1, wherein the nonvolatile storage element is attached to the throttle valve device. In claim 1, the throttle device has a communication terminal for communicating with the outside, and when storing the maximum value in the nonvolatile storage element, when the storage command of the maximum value is received from the communication terminal. And storing the maximum value in the nonvolatile storage element. 3. The method according to claim 2, wherein when the maximum value is stored in the nonvolatile storage element, a mechanism for controlling an air flow rate in the throttle body is fixed by using a jig so that the maximum value flows through the throttle body. A throttle valve device. 2. The throttle valve device according to claim 1, wherein the throttle valve device is stored in a nonvolatile storage element in the throttle body integrated device immediately after assembling the throttle device, during a test, and at the time of mounting the vehicle. A tubular air passage having an air inlet and an air outlet,
A throttle valve attached to a shaft crossing the air passage, and fully closing the air passage by rotating with the shaft;
A motor for rotating the shaft,
In a throttle valve device having a control circuit that controls the rotation of the motor and a throttle sensor that detects a rotation angle of the shaft,
A nonvolatile storage element that records an output value of a throttle sensor when the throttle valve is rotated to an end opposite to the fully closed position;
The throttle valve device, wherein the nonvolatile memory element and the control circuit are electrically connected. 7. The throttle valve device according to claim 6, wherein the nonvolatile recording element is attached to the throttle valve device. 8. The throttle valve device according to claim 6, wherein the position of the throttle valve when current is not flowing to the motor is a position between a fully closed position and a terminal position on the opposite side. . 8. The throttle according to claim 6, wherein the control circuit is connected to a terminal for inputting and outputting a signal to and from the outside of the throttle valve device, and rotates the shaft based on the signal from the outside. Valve device.

Images