JP2007162708A - Electronic controlled throttle valve device, non-contact rotating angle detector to be used for the same, and signal processor for hall element - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the delay of equipment control by giving the output of a Hall element to an after-processing circuit as quickly as possible while eliminating wasteful converting processing for a magnetic sensitive non-contact throttle sensor. <P>SOLUTION: This electronic controlled throttle valve device comprises a throttle position sensor consisting of a magnet 31 provided on a throttle valve shaft 40, and the Hall element whose output is changed with the rotational displacement of the magnet 31. The Hall element is built in one sensor chip 6 together with an amplifying circuit. In a control unit separate from the sensor chip 6, there are provided an A/D conversion circuit 50 (51) for converting the analog output of the Hall element output via the amplifying circuit into a digital signal and a digital processing circuit 54 (55) for performing the temperature compensation and zero-span adjustment of the Hall element on a digital basis. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a rotation angle detection device using a Hall element, a signal processing device for the Hall element, and further to a throttle valve device for an automobile using the rotation angle detection device, preferably a throttle valve driven by a motor. The present invention relates to a so-called electronically controlled throttle valve device.

  Conventionally, a non-contact type rotation angle detection device (rotation angle sensor) that detects a rotation angle of a rotation shaft by attaching a magnet to the rotation shaft and cooperating with the magnet and a hall element arranged around the rotation shaft. It has been known.

  In this type of rotation angle detection device, a Hall element, a circuit for adjusting the output of the Hall element to zero span (zero span adjustment circuit), and / or a circuit for compensating temperature drift of the Hall element (temperature compensation circuit) Are configured as a single semiconductor package (chip) to enhance the function of the sensor (generally called a Hall IC).

  For example, in Japanese Patent Laid-Open No. 8-68606, as a sensing unit for detecting a rotation angle, an EPROM and a register including an amplifying circuit, an adjusting circuit, and the like including a magnetosensitive element made of a Hall element are integrated. The technology used as a chip is described.

  Japanese Laid-Open Patent Publication No. 2000-74613 discloses that in a throttle sensor, a Hall element generates a Hall voltage in response to a magnetic flux density that changes in accordance with the throttle opening, and this Hall voltage is input to an IC to generate temperature characteristics. A technique for performing various processes such as compensation is described.

  In the above throttle valve device, in order to perform zero span adjustment or temperature compensation with high accuracy, it is necessary to convert the output of the Hall element from analog to digital signal (A / D conversion) and perform digital signal processing.

  Therefore, in the conventional semiconductor package system (Hall IC), the Hall element, the A / D conversion circuit, the zero span adjustment circuit, and the temperature compensation circuit are stored together in one mold resin. Further, when the output of the Hall IC is transmitted to an external control unit, the analog transmission system is adopted because the microcomputer on the signal receiving side is configured to digitally convert the analog input. Therefore, the mold resin of the Hall IC also houses a D / A conversion circuit that converts the digital signal into an analog signal again (D / A conversion) and outputs the analog signal.

  As described above, when the A / D circuit and the D / A circuit are provided in the Hall IC, the signal processing time is 2 milliseconds for A / D conversion until the signal is output from the Hall IC. / A conversion takes 2 milliseconds.

  According to the above processing time, for example, the following problems occur in the control of an internal combustion engine of an automobile. That is, when the Hall IC as described above is used as the opening degree detection (rotation angle detection) sensor for the throttle valve that controls the air amount, the output change of the Hall element itself with respect to the opening degree change is the output terminal of the sensor, that is, the Hall IC. A time delay occurs until the output terminal appears as a change in output, and real-time opening degree detection and opening degree control cannot be performed, resulting in a response delay.

  This problem is conspicuous when an analog signal is converted into a digital signal and fetched as in a microcomputer (for example, an engine control unit). Considering the A / D conversion process for the fetching process of the microcomputer, it is further 2 mm. A signal delay of 2 seconds occurs.

  From another point of view, when an analog signal is converted into a digital signal and taken in like a microcomputer, A / D conversion and D / A conversion before that are overlapped with A / D conversion. Therefore, it is not a reasonable process.

JP-A-8-68606 JP 2000-74613 A

  An object of the present invention is to eliminate useless conversion processing and to output the output of a Hall element to a post-processing circuit as soon as possible so as not to cause, for example, control delay of equipment.

  Another object of the present invention is to provide a configuration suitable as a rotation angle detection device for a throttle valve shaft for an automobile using such a Hall element.

  A throttle valve device equipped with such a sensor is also proposed.

In order to achieve the above object, the present invention is basically configured as follows.
(1) In the rotation angle detection device configured to generate an electrical signal related to the rotation angle of the rotation shaft in the Hall element by the interaction between the Hall element and a magnet attached to the rotation shaft,
A circuit mold chip in which the Hall element and an amplifier for amplifying the output of the Hall element are sealed together in a mold resin;
An A / D converter for converting the output of the amplifier output from the output terminal of the circuit mold chip from analog to digital outside the circuit mold chip;
An electrical conductor connecting the circuit mold chip and the A / D converter;
And an auxiliary circuit that digitally provides zero span adjustment and temperature compensation to the output of the A / D converter.

In addition, the following is proposed as a related invention for achieving the same problem.
(2) In the Hall element signal processing apparatus configured to A / D-convert the output of the Hall element and take it into a microcomputer, and to output an electrical signal related to the output of the Hall element from the microcomputer. A single A / D converter is provided in the signal transmission path from the output end of the element to the input interface of the microcomputer.

Preferably, the output of the A / D converter is carried on a communication line and conveyed to the microcomputer.
(3) Two Hall elements that are sensitive to the rotation of the rotation shaft and are arranged at different positions with respect to the rotation direction of the rotation shaft, and from the output signals of the two Hall elements to the rotation position of the rotation shaft In the Hall element output signal processing device configured to output a related signal,
Two amplifiers that amplify the outputs of the two Hall elements are mounted on a casing that holds the two Hall elements, and a connector for taking out the outputs of the two amplifiers is formed on the casing, and connected to the connector The Hall element output signal A / D converter is provided in the circuit device that receives the Hall element output signal.
(4) A microcomputer for digitally calculating a signal necessary for controlling the throttle valve in accordance with the operating state of the engine, a motor driven by the digitally calculated electric signal, and a throttle valve whose opening degree is controlled by this motor And an electronically controlled throttle device comprising a throttle position sensor that detects the rotation angle of the throttle valve based on the output of the Hall element,
The time required for the input processing of the output signal of the Hall element is a throttle valve device that is shorter than the calculation cycle for digitally calculating the electric signal for controlling the motor.
(5) A magnet mounted on the throttle valve shaft and rotating, and a Hall element that is magnetically sensitive to the magnet, and an electrical signal related to the rotation angle of the throttle valve shaft are generated by the Hall element. In electronically controlled throttle device,
The throttle valve device is provided with a connector having a signal extraction terminal for extracting the output signal of the Hall element, and the time until a signal change generated in the Hall element appears at the signal extraction terminal is A / D A signal transmission path from the output terminal of the Hall element to the terminal of the connector was configured so as to be earlier than the time required for conversion.

Preferably, the signal transmission path includes an amplifier that amplifies the output of the Hall element;
A throttle valve device comprising an electric conductor connecting between the amplifier and a terminal of the connector is preferable.
(6) A microcomputer for digitally calculating a signal necessary for controlling the throttle valve according to the operating state of the engine, a motor driven by the digitally calculated electrical signal, and a throttle valve whose opening degree is controlled by the motor And an electronically controlled throttle valve device comprising a throttle position sensor that detects the rotational position of the throttle valve shaft,
The throttle position sensor includes a magnet that is displaced in response to rotation of the throttle valve shaft, and two Hall elements that are arranged at different positions with respect to the rotation direction of the throttle valve shaft, The two Hall elements are configured to output a signal related to the rotational position of the throttle valve shaft, and each Hall element and each amplifier for amplifying the output are paired and sealed in a mold resin. Two circuit mold chips,
A housing for holding the circuit mold chip;
One connector formed in the housing and for taking out the outputs of the two amplifiers;
And an electric conductor molded in the casing for connecting the output end of the circuit mold chip and the connector.

Preferably, a reduction gear mechanism is provided between the output shaft of the motor and the throttle valve shaft, and the housing may serve as a gear cover that covers the gear mechanism.
(7) In an electronically controlled throttle valve device including an electric actuator that drives a throttle valve provided in an intake passage of an internal combustion engine based on a control signal, and a throttle position sensor that detects a throttle valve opening degree,
The throttle position sensor includes a magnet provided on a throttle valve shaft, and a Hall element whose output changes due to rotational displacement of the magnet, and the Hall element is built in one sensor chip together with an amplifier circuit, while the sensor An A / D conversion circuit and a temperature compensation and zero point compensation circuit for the Hall element were provided in a control unit separate from the chip.

  According to the present invention, in the rotation angle detection element, the Hall element signal processing device, and the throttle valve control device, it is possible to eliminate unnecessary conversion processing of the output of the Hall element and output it to the post-processing circuit as soon as possible. Control delay or the like can be prevented.

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

  FIG. 1 is a block circuit diagram of an electronically controlled throttle device according to an embodiment of the present invention.

  The throttle valve device of the present embodiment can be broadly divided into (1) a throttle valve 310 built in the throttle body 300, a reduction gear mechanism 303 that transmits the power of the motor (electric actuator) 302 to the throttle valve shaft 40, and the like. A throttle valve mechanism A, (2) a sensor module B for detecting the rotation angle (opening degree) of the throttle valve 310, and (3) a throttle valve control signal based on an output signal from the sensor module B And a throttle control module (hereinafter referred to as TCM).

  The throttle body 300 becomes a part of the intake passage of the internal combustion engine, and a throttle valve 310 is disposed in the intake passage.

  The sensor module B functions as a throttle position sensor that detects the throttle valve opening, and includes a magnet 31 provided at one end 41 of the throttle valve shaft and a sensor chip 6 whose output changes due to rotational displacement of the magnet 31. The sensor chip 6 is a one-chip Hall element (magnetically sensitive element) and an amplifier circuit that amplifies its output, and is sometimes referred to as a Hall IC. Although only one of them functions, two are used to enable mutual backup or failure diagnosis check in the event of a failure.

  Here, the sensing principle by the sensor chip 6 using the Hall element will be described with reference to FIGS.

  FIG. 8 shows the arrangement of the upper stator 4, the lower stator 2 (2 </ b> A, 2 </ b> B), the rotor (permanent magnet) 31, and the sensor chip 6 through the upper stator 4 that is a component of the rotation angle detection device. Is.

  As shown in FIG. 8, a rotor is configured by attaching a ring-shaped permanent magnet 31 to the tip of a rotating shaft (throttle valve shaft) 41 to be detected. As shown in FIGS. 7 and 8, the rotor 31 is disposed between magnetic plates (upper stator, lower stator) 4 and 2 (2A and 2B) which are vertically opposed to each other. At least one of the upper and lower stators is arranged separately on the left and right. In the present embodiment, the air stator G is secured by arranging the lower stator 2 separately as 2A and 2B.

  The upper stator 4 and the lower stators 2A and 2B have magnetic protrusions 401, 402, 201, and 202 that serve as magnetic flux constrictions (magnetic flux converging parts), respectively. The magnetic protrusions 401 and 201 are arranged to face each other while maintaining a uniform gap. Similarly, the magnetic protrusions 402 and 202 are arranged to face each other. The sensor chip 6 having a Hall element (magnetic sensitive element) is sandwiched between the magnetic protrusions 401 and 201 and between the magnetic protrusions 402 and 202, respectively.

  In the present embodiment, the magnetic protrusion is formed integrally with the upper stator and the lower stator, but a previously formed magnetic protrusion may be joined by welding or the like. This magnetic protrusion is disposed at a position facing the outer periphery of the rotor 31 through air-up.

  The sensor chip 6 is constituted by a circuit mold chip in which a Hall element and an amplifier circuit are integrated and these are enclosed in a mold resin and formed into a chip shape.

  As shown by the arrows in FIG. 9, the rotor 31 is generally magnetized in the vertical direction. The direction of magnetization of the rotor 31 is upward in the region of the rotation direction of 180 degrees and downward in the remaining region of 180 degrees.

  The magnetic flux density vector at this time has a distribution as shown by the arrow in FIG. That is, the magnetic field generated by the rotor 31 forms a magnetic path that passes through the upper and lower stators 401 and 402, and the magnetic flux converged by the magnetic protrusions 401 and 201 and the magnetic protrusions 402 and 202 passes through each sensor chip 6. The amount of magnetic flux that passes through the sensor chip varies depending on the rotational position of the rotor 31. By outputting a signal corresponding to the change in the amount of magnetic flux from the sensor chip 6, it is possible to detect the rotational position (rotational angle).

  The circuit configuration of the rotation angle detection device will be described with reference to FIG.

  FIG. 6 is a circuit configuration example when two sensor chips (circuit mold chips) 6 are used. Each sensor chip 6 is connected between the power supply VDD and the ground GND, and the output of one Hall IC 6 can be taken out from the output terminal S1, and the output of the other Hall IC 6 can be taken out from the output terminal S2.

  In this embodiment, a capacitor C3 is connected between the power supply VDD and the ground GND, a capacitor C1 is connected between the output terminal S1 and the ground GND, and a capacitor C2 is connected between the output terminal S2 and the ground GND.

  Capacitor C3 is used for electrical disturbance noise and surge protection, and C1 and C2 operate as a filter for Hall IC internal noise in addition to electrical disturbance noise and surge protection. Capacitors C1, C2, and C3 may be used alone as necessary, or may be used in combination with a Zener diode or a resistance element (not shown).

  Next, the TCM in FIG. 1 will be described.

  The TCM includes input / output interfaces 50 and 51 corresponding to each sensor chip 6, storage devices 52 and 53 for storing zero span data (zero point data) regarding the output from the sensor chip 6 and a temperature characteristic table, and sensor chip 6 by digital processing. Digital processing circuits (temperature compensation circuit, zero span adjustment circuit) 54, 55 for adjusting the output of the output and temperature correction, microcomputer 56 for controlling the throttle opening, and drive circuit 57 for the motor for driving the throttle valve Prepare.

  The output of each sensor chip 6 is digitally converted by the interfaces 50 and 51 and then sent to the digital processing circuits 54 and 55. The zero span data is executed by setting the throttle opening to zero (minimum) in advance, digitally processing the output of each sensor chip 6 obtained at that time, and storing it in the storage devices 52 and 53 as a zero point output.

  The storage devices 52 and 53 include a plurality of temperature characteristic tables related to the output of the Hall element corresponding to the temperature range. The digital processing circuits 54 and 55 adjust the zero point after the A / D conversion for the output of the sensor chip 6 (throttle opening signal, rotation angle signal), and use a temperature characteristic table corresponding to the ambient temperature of the sensor chip 6. The temperature is compensated (temperature correction) and sent to the microcomputer 56.

  The microcomputer 56 serves as the center of throttle opening control, a ROM that stores a control program, a RAM that stores a throttle opening signal and the like in a rewritable manner, and a throttle target input from an external engine control unit (ECU). A central processing unit (CPU) that inputs the opening and the actual throttle opening signal and calculates a control signal so that the throttle valve reaches the target opening is provided. The drive circuit 57 is driven by the control signal of the CPU to control the motor current. The drive circuit 57 is composed of, for example, a pulse width modulation circuit (PWM).

  The sensor chip (circuit mold chip) 6 is assembled together with the stators 4 and 2 (2A and 2B) in a resin gear cover 100 attached to the throttle body 300 (a detailed example of the mounting structure will be described later with reference to FIG. 11). To do). FIG. 2 is a schematic diagram in which the stator is omitted and two sensor chips 6 are incorporated in the gear cover 100. The size of the sensor chip 6 is shown in an exaggerated manner. Actually, for example, as shown in FIG. 13, the ratio occupied by the gear cover 100 is small.

  The sensor chip 6 includes a magnetic sensitive element (Hall element) 61 and an amplifier circuit (AMP) 62 sealed together with a mold resin (indicated by a one-dot chain line). A power supply terminal (Vcc) 8A, a ground terminal ( GND) 8B and output terminals (S1, S2) 8C.

A connector case 60 is formed integrally with the resin cover 100. Further, a power supply line 7A, a ground line 7B, and output signal lines 7C ₁ and 7C ₂ are embedded in the resin cover 100 by insert molding, and one ends 7A ′ and 7B ′ and output signal lines 7C ₁ ′ and 7C ₂ ′ are embedded. Is exposed on the inner surface of the cover 100 and connected to the corresponding terminals 8A, 8B, 8C of the sensor chip 6. The other ends 70A, 70B, 70C ₁ and 70C ₂ serve as connector terminals and protrude into the connector case 60.

  Further, in the resin cover 100, power lines (+ lines) 7D and (-lines) 7E of the throttle valve drive motor 302 are embedded by insert molding, and one ends 7D 'and 7E' thereof are exposed on the inner surface of the cover 100. Thus, the other end 70D and 70E are connected to the power supply terminal of the motor 302 and project into the connector case 60 as connector terminals.

1 and 2, the output signal of the Hall element 61 is A / D converted outside the circuit mold chip 6. The Hall element signal processing apparatus has a single A / D converter 50 (51) in the signal transmission path from the output end of the Hall element 61 to the input interface of the microcomputer 54. In this way, only A / D is sufficient from the sensor chip (Hall IC) 6 to the microcomputer 54 without A / D, D / A, and A / D as in the prior art. Therefore, it is possible to realize a rotation angle detection device (throttle position sensor) with high signal transmission speed and excellent response. That is, the time required for the input process of the output signal of the Hall element 61 can be made shorter than the calculation cycle for digitally calculating the electric signal for controlling the motor. Further, the signal from the output terminal of the Hall element to the terminal of the connector is set so that the time until the signal generated in the Hall element 61 appears at the signal extraction terminals 70C ₁ and 70C ₂ is earlier than the time required for A / D conversion. A transmission path can be configured.

  FIG. 11 is a longitudinal sectional view of the non-contact type throttle valve device according to one embodiment of the present invention (cross-sectional view taken along the line AA in FIG. 14), and FIG. 12 shows only the rotation angle detecting device (throttle position sensor) portion of the device. 13 is a top view showing the inside of the housing by removing the sensor cover 5 and the lower stator 4 from the gear cover 100 shown in FIG. 14 and a front view of the connector portion thereof, and FIG. 14 is attached to the throttle body 300. FIG. 15 is a partial perspective view of FIG. 13 and FIG. 16 is a partially enlarged view of FIG.

  In this embodiment, a gear cover 100 of a gear mechanism 303 for motor power transmission is attached to a throttle body 300 having a throttle valve 310. A throttle position sensor (a throttle valve rotation angle detection device) is attached to the gear cover 100.

As shown in FIGS. 13 and 14, the gear cover 100 is made of synthetic resin and includes external connection terminals 70A, 70B, 70C ₁ , 70C ₂ , 70D, and 70E for electrical connection with external devices and a power source. It is formed integrally with the connector 60.

  The throttle body 300 is integrally formed with a motor housing 301 that houses a motor 302 that drives the throttle valve shaft 40, a gear mechanism 303, and a gear housing 306 that places a default mechanism. Covering the gear housing 306 is a gear cover 100, and the sensor housing 1 is formed on the gear cover 100.

  The power supply terminal 302A of the motor 302 and its ground terminal 302B are connected to intermediate terminals 312A and 312B provided on the gear cover 100 via a connection fitting 311.

  The power of the motor 302 is transmitted to the throttle valve shaft 40 via the gear mechanism 303 (pinion 303A, intermediate gear 303B, final gear 303C), and the throttle valve 310 is driven.

  As shown in FIG. 12, the housing 1 has a shaft hole 45 for guiding one end 41 of the rotary shaft 40 to the bottom wall. On the inner bottom of the housing 1, two recesses 3 for accommodating the lower stators 2 </ b> A and 2 </ b> B are formed separately on the left and right around the shaft hole 45. In each recess 3, lower stators 2A and 2B are attached by adhesion. The housing 1 holds the lower stators 2A and 2B by bonding, but the lower stators 2A and 2B may be held by insert molding in the housing 1 instead of bonding.

  In the housing 1, a spacer 12 (see FIG. 15) that functions as a relative alignment between the upper stator 4 and the lower stators 2A and 2B and a distance between the stators is formed integrally with the housing 1.

  The spacer 12 is formed so as to cover the four corners of the lower stator 2A, 2B, and an L-shaped convex portion 12A for receiving the corner of the upper stator 4 is formed on the upper surface of the spacer.

The connector 60 is formed integrally with the cover 100 on the side surface of the gear cover 100 as shown in FIG. As shown in FIG. 13, the external connection terminals insert-molded in the connector 60 include terminals 70A, 70B, 70C ₁ and 70C ₂ used for the two Hall ICs 6 of the rotational position sensor, and a motor terminal 70D for driving the throttle. There is 70E. In the present embodiment, the two sensor chips 6 share the power supply terminal VDD (external connection terminal 70A) and the GND terminal (external connection terminal 70B) of the two sensor chips 6. In the plan view of FIG. 13, the external connection terminal 70B is not shown hidden behind the 70C _2, likewise the external connection terminal 70C ₁ is hidden 70A shade, the external connection terminal 70E is behind the 70D It is hidden and not shown.

As shown in FIG. 13, the external connection terminals related to the rotational position sensor (throttle position sensor) are one power supply terminal 70A (VDD), one ground terminal 70B (GND), and two sensor input / output terminals. The total number is 70C ₁ and 70C ₂ (S1, S2). There are a total of six external connection terminals including the four sensor-related terminals, the motor power terminal 70D, and the ground terminal 70E. Three of these terminals are arranged in two rows.

Conductor 7A corresponding to power supply terminal VDD (external connection terminal 70A), conductor 7B corresponding to ground terminal (external connection terminal 70B), conductor 7C corresponding to sensor output terminals S1 and S2 (external connection terminals 70C ₁ and 70C ₂ ) ₁ and 7C ₂ and the conductors 7D and 7E corresponding to the motor terminals 70D and 70E are embedded in the gear cover 100 by insert molding.

Conductors 7A, _7B, among 7C 1, 7C _2, divided into two in the middle for the supply conductors 7A, the end 7A 'is led out to the joint between the power supply terminal 8A of each hole IC 6. The ground conductor 7B is also divided into two parts along the way, and each end 7B 'is drawn out to the joint portion of each Hall IC 6 with the ground terminal 8B.

The conductors 7A, 7B, 7C ₁ and 7C ₂ are partially exposed to be connected to circuit elements such as the capacitor 20 so that the portions 7A ″, 7B ″, 7C ₁ ″ and 7C ₂ ″ are exposed. . Among these, there is one exposed portion 7A ″ corresponding to the power supply conductor 7A, two exposed portions 7B ″ corresponding to the ground conductor 7B, and exposed portions 7C ₁ ″ corresponding to the sensor output conductors 7C ₁ and 7C _2. , 7C ₂ ″ are one by one (see FIGS. 13 and 14).

The conductor exposed portions are arranged in the following manner: sensor output conductor exposed portion 7C ₁ ″, ground conductor exposed portion 7B ″, power source conductor exposed portion 7A ″, ground conductor exposed portion 7B ″, sensor output conductor exposed portion 7C _2. "In order.

Then, between the sensor output conductor exposed portion 7C ₁ ″ and the ground conductor exposed portion 7B ″, between the power source conductor exposed portion 7A ″ and the ground conductor exposed portion 7B ″, and between the ground conductor exposed portion 7B ″ and Circuit elements such as a capacitor 20 are connected between the sensor output conductor exposed portions 7C ₂ ″. This circuit element is inserted into a recess (hole) 15 provided between exposed conductors on the inner surface of the gear cover 100.

As shown in FIG. 15, the conductor _{7A, 7B, 7C 1, 7C} 2 end 7A ', 7B', 7C ' 1, 7C' 2 are input and output terminals 8A of the Hall IC 6, 8B, the predetermined that 8C of Exposed on the surface of the inner wall of the housing. The conductor ends 7A ′, 7B ′, 7C ′ ₁ and 7C ′ ₂ are bent so as to protrude onto the surface of the inner wall of the housing.

As shown in FIG. 16, input / output terminals 8A, 8B, and 8C of the Hall IC 6 are connected to conductor ends 7A ′, 7B ′, 7C ′ ₁ , and 7C ′ _{2 on the} inner peripheral wall of the lower stator 2A, 2B installation location of the housing 1, respectively. A groove-shaped guide 10 that leads to the terminal joint is provided. The input / output terminals 8A, 8B, 8C are guided by being fitted into the guide 10. The guide 10 also functions as positioning of the sensor chip 6.

The terminals 8A, 8B, 8C of the sensor chip 6 are joined to the conductor ends 7A ′, 7B ′, 7C ′ ₁ , 7C ′ ₂ by welding. The terminals 8A, 8B, 8C are vertically bent so that the ends thereof are aligned with the conductor ends 7A ′, 7B ′, 7C ′ ₁ , 7C ′ ₂ .

  As shown in FIGS. 11 and 12, the magnet holder 30 is attached to one end 41 of the rotating shaft 40. The magnet holder 30 holds an annular permanent magnet (rotor) 31. Reference numeral 32 denotes a shaft hole provided in the holder 30 (FIG. 13). A return force is biased to the rotating shaft 40 by a return spring 305. 44 is a C-ring.

  As shown in FIG. 12, the upper stator 4 is held by the cover 5 by being bonded to a protrusion 5 ′ provided inside the cover 5 of the sensor housing 1. The cover 5 is attached to the upper opening of the housing 1 so that the four corners of the upper stator 4 are positioned and held on the upper surface of the spacer 12. The upper stator 4 is positioned with respect to the lower stators 2 </ b> A and 2 </ b> B by the spacer 12. The spacer 12 holds a uniform gap between the upper stator and the lower stator. The sensor chip 6 is located between the magnetic protrusions 401 and 201 and between the magnetic protrusions 402 and 202.

  Since the wire harness in the housing 1 of the non-contact type rotational position sensor is almost insert-molded, it is possible to assemble parts and electrically connect circuit elements without making the housing complicated by wiring.

  In addition, the sensor chip 6 that requires positioning accuracy can be simply positioned by simply fitting the terminals 8A to 8C into the guide groove 10, and the terminals 8A to 8C and the terminals of the conductors 7A to 7C can be positioned. Positioning can also be performed easily.

  The relative positioning of the upper stator 4 and the lower stators 2A and 2B and the uniform holding up between them can be easily and accurately performed by the spacer 12 with the L-shaped protrusion 12A provided on the housing 1.

  The connector 60 is formed on one side of the gear cover 100, and external connection terminals 70A to 70E are insert-molded therein.

  Electrical disturbance noise and surge protection to the sensor chip can be achieved with a relatively simple configuration. Further, since the capacitor, Zener diode, etc. of the circuit element for electrical disturbance noise and surge protection are not built in the highly integrated IC, the sensor chip can be prevented from being enlarged, and the circuit element such as the capacitor 20 is not provided. Since the conductor exposed portions 7A ", 7B", 7C "can be connected in the state of being inserted into the recess 15, the circuit element space in the housing 1 can be rationalized, and the mounting density of the circuit elements can be increased.

  Therefore, it is possible to realize a non-contact type rotational position sensor that can achieve parts consolidation, miniaturization, simple assembly, and high accuracy.

  The upper and lower stators 4, 2A, 2B are held in the cover 5 and the housing 1 from before assembly, and the upper and lower stators are naturally positioned relative to each other by attaching the cover to the housing. Since the protrusion and the Hall IC are also arranged in the vertical direction together with the stator, it is possible to further reduce the size of the sensor, simplify the assembly, increase the accuracy, and consolidate the parts.

  FIG. 3 is a schematic view of a throttle valve device according to the second embodiment of the present invention.

  The difference from the first embodiment is that a TCM is incorporated in the gear cover 100 in addition to the circuit mold chip (sensor chip) 6 of the throttle position sensor. The circuit configurations of the circuit mold chip 6 and the TCM are the same as those in FIG. The conductor connecting the circuit mold chip 6 and the TCM may be wired to the gear cover 100 by insert molding.

  FIG. 4 is a schematic diagram of a throttle valve device according to a third embodiment of the present invention. In this embodiment, in addition to the circuit mold chip (sensor chip) 6 of the throttle position sensor, a TCM and an ECU (engine control unit) are also incorporated in the gear cover 100. The circuit configurations of the circuit mold chip 6 and the TCM are the same as those in FIG.

  The ECM calculates the target opening command signal by inputting the signal from the accelerator depression amount sensor, the input / output interface, the ROM having the control program, the RAM for calling the control program and storing the sensor signals of various engine states, the calculation It consists of a CPU that performs processing.

  FIG. 5 is a schematic view of a throttle valve device according to a fourth embodiment of the present invention. In this embodiment, a circuit mold chip (sensor chip) 6 and an ECU of a throttle position sensor are incorporated in the gear cover 100, and a TCM control function is included in the CPU of the ECU. The gear cover 100 incorporates an A / D converter, a digital zero span adjustment circuit, and a temperature compensation circuit, which are circuits in front of the ECU. In addition, a motor driver circuit is incorporated. The CPU of the ECU performs motor drive current calculation and feedback control.

1 is a block circuit diagram of an electronically controlled throttle valve device according to a first embodiment of the present invention. Schematic which shows the relationship between the gear cover and sensor chip (circuit mold chip) in the said Example. The block circuit diagram of the electronically controlled throttle valve apparatus concerning 2nd Example of this invention. FIG. 6 is a block circuit diagram of an electronically controlled throttle valve device according to a third embodiment of the present invention. The block circuit diagram of the electronically controlled throttle valve apparatus which concerns on 4th Example of this invention. The circuit block diagram of the sensor chip in the said Example. The perspective view which shows the principle of a magnetic sensitive type rotational position sensor. The perspective view of FIG. The perspective view which added the magnetization direction to FIG. The perspective view which added the vector of magnetic flux density to FIG. FIG. 15 is a longitudinal sectional view showing a state in which the rotational position sensor (throttle position sensor) according to the first embodiment is mounted on the throttle body (a CC sectional view of FIG. 14). Sectional drawing which showed only the part of the rotational position sensor of FIG. The top view which removed the cover 5 and the lower stator 4 from the rotational position sensor shown in FIG. 14, and showed the internal structure of the housing, and the front view of the connector part. The top view of a gear cover. FIG. 14 is a partially enlarged perspective view of FIG. 13. The elements on larger scale of FIG.

Explanation of symbols

6 ... Sensor chip (circuit mold chip), 40 ... Throttle valve shaft, 50, 51 ... Interface (A / D conversion circuit), 52, 53 ... Storage device, 54, 55 ... Digital processing circuit (temperature compensation circuit, zero span) Adjustment circuit), 56 ... microcomputer (throttle valve opening control circuit), 57 ... motor drive circuit, 61 ... Hall element, 62 ... amplifier circuit, 302 ... motor, 303 ... gear mechanism.

Claims (10)

In an electronically controlled throttle valve device comprising an electric actuator that drives a throttle valve provided in an intake passage of an internal combustion engine based on a control signal, and a throttle position sensor that detects a throttle valve opening degree,
The throttle position sensor includes a magnet provided on a throttle valve shaft, and a Hall element whose output changes due to rotational displacement of the magnet, and the Hall element is built in one sensor chip together with an amplifier circuit, while the sensor An A / D conversion circuit that converts the analog output of the Hall element output through the amplifier circuit into a digital signal to a control unit separate from the chip, and temperature compensation and zero span adjustment of the Hall element are digital An electronically controlled throttle valve device characterized in that a digital processing circuit is provided. A non-contact type configured to cause the Hall element to generate an electrical signal related to the rotation angle of the rotating shaft by the interaction between the magnet attached to the rotating shaft and the Hall element disposed in the magnetic field of the magnet. In the rotation angle detection device of
A circuit mold chip in which the Hall element and an amplifier for amplifying the output of the Hall element are sealed together in a mold resin;
An A / D converter for converting the output of the amplifier output from the output terminal of the circuit mold chip from analog to digital outside the circuit mold chip;
An electrical conductor connecting the circuit mold chip and the A / D converter;
And an auxiliary circuit that digitally provides zero span adjustment and temperature compensation to the output of the A / D converter. In the Hall element signal processing apparatus configured to convert the output of the Hall element from analog to digital and take it into a microcomputer, and to output an electrical signal related to the output of the Hall element from the microcomputer,
A signal processing apparatus for a hall element, comprising a single A / D converter in a signal transmission path from an output terminal of the hall element to an input interface of the microcomputer.   4. The hall element signal processing apparatus according to claim 3, wherein the output of the A / D converter is carried on a communication line and conveyed to the microcomputer. A signal that is sensitive to the rotation of the rotation shaft and has two Hall elements arranged at different positions with respect to the rotation direction of the rotation shaft, and that is related to the rotation position of the rotation shaft from the output signals of the two Hall elements In the Hall element output signal processing device configured to output
Two amplifiers that amplify the outputs of the two Hall elements are mounted on a casing that holds the two Hall elements, and a connector for taking out the outputs of the two amplifiers is formed on the casing, and connected to the connector A Hall element output signal processing apparatus comprising a Hall element output signal A / D converter in a circuit device that receives the Hall element output signal. A microcomputer for digitally calculating a signal necessary for controlling the throttle valve according to the operating state of the engine, a motor driven by the digitally calculated electric signal, a throttle valve whose opening degree is controlled by this motor, a hall In an electronically controlled throttle valve device comprising a throttle position sensor for detecting a rotation angle of the throttle valve based on an output of an element,
An electronically controlled throttle valve device characterized in that a time required for input processing of an output signal of the hall element is shorter than a calculation cycle for digitally calculating an electric signal for controlling the motor. An electronic control type comprising a magnet attached to the throttle valve shaft and rotating, and a Hall element magnetically sensitive to the magnet, wherein the Hall element generates an electrical signal related to the rotation angle of the throttle valve shaft. In the throttle valve device,
The throttle device is provided with a connector having a signal extraction terminal for extracting the output signal of the Hall element, and the time until the signal generated in the Hall element appears at the signal extraction terminal is A / D converted. An electronically controlled throttle valve device comprising a signal transmission path from the output terminal of the Hall element to the terminal of the connector so as to be earlier than the time required for the operation.   8. The electronically controlled throttle valve device according to claim 7, wherein the signal transmission path includes an amplifier that amplifies the output of the Hall element and an electric conductor that connects between the amplifier and a terminal of the connector. A microcomputer for digitally calculating a signal necessary for controlling the throttle valve according to the operating state of the engine, a motor driven by the digitally calculated electrical signal, a throttle valve whose opening degree is controlled by the motor, and a throttle In an electronically controlled throttle valve device comprising a throttle position sensor for detecting the rotational position of the valve shaft,
The throttle position sensor includes a magnet that is displaced in response to rotation of the throttle valve shaft;
Two Hall elements arranged at different positions with respect to the rotation direction of the throttle valve shaft, and outputting signals related to the rotation position of the throttle valve shaft from the two Hall elements. Configured, two circuit mold chips formed by enclosing each Hall element and each amplifier for amplifying its output as a set and sealed with a mold resin for each set;
A housing for holding the circuit mold chip;
One connector formed in the housing and for taking out the outputs of the two amplifiers;
An electrical conductor molded in the housing to connect the output end of the circuit mold chip and the connector;
An electronically controlled throttle valve device comprising:   The electronically controlled throttle valve device according to claim 9, wherein a reduction gear mechanism is provided between an output shaft of the motor and the throttle valve shaft, and the housing also serves as a gear cover that covers the gear mechanism.

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