JP2005054765A - Accelerator device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent the fluctuation of an output voltage at a time of idling by forming resistors in a variable region and an invariable region. <P>SOLUTION: This accelerator device is provided with a support case having a base end included in an accelerator arm having an accelerator pedal on the tip thereof and rotatably supporting the base end by a support shaft, a return spring energizing the accelerator arm in a accelerator pedal return direction for returning the accelerator pedal to an initial position, an accelerator sensor for detecting an accelerator pedal depressed amount as an accelerator opening. The resistors each measuring the accelerator pedal depressed amount is composed of a single layer or multi layers and composed of the variable region of a steep output voltage gradient proportional to the accelerator pedal depressed amount and the invariable region of a gentle output voltage gradient as compared with the accelerator pedal depressed amount. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an accelerator device used in an electronically controlled throttle device of a vehicle engine. More specifically, the present invention relates to an accelerator device that prevents a shift in the output voltage of an accelerator sensor when an accelerator pedal is erroneously operated, that is, when the accelerator pedal is further operated to return the accelerator pedal.

  Conventionally, it is shown in Patent Document 1 described below. As shown in FIG. 8 (corresponding to FIG. 9 of Patent Document 1), the resistance electrode 122 formed on the substrate 92 in the sensor 120 incorporated in the accelerator device is changed from the start point a to the conversion point d (FIG. 9 (Patent Document 1). 2), the accelerator pedal 42 is in the vicinity of the start of depression, and as shown in FIG. 10 (corresponding to FIG. 10 of Patent Document 1), the accelerator opening θ is θ = θ3. ) And a linear portion 122b corresponding to a second conversion region (linear region) between the conversion point d and the end point c. Have

  In the stepped portion 122a, a resistive material is laminated in a single layer or multiple layers on the conductive layer 124 formed on the substrate 92. On the other hand, the linear portion 122b is formed by layering a resistive material on the substrate 92 in one layer or multiple layers. From the starting point a to the negative end point e of the resistance electrode 122 [on the opposite side (negative side) of the depression direction of the accelerator pedal 42 with respect to the starting point a, and as shown in FIG. 10, the accelerator opening θ is θ = −θ4. ] Is configured as a petal play range.

  The characteristics of the output voltage V output from the sensor 120 based on the accelerator opening are as shown in FIG. In the stepped region, the output voltage V becomes a constant value of V = V1 with respect to the change in the accelerator opening θ. That is, this stepped region is an invariable region where the output voltage V does not change.

It is also shown in Patent Document 2. As shown in FIG. 11 (corresponding to FIG. 4 of Patent Document 2), the resistance plate 10 formed in an arc shape together with the conductive plate 7 on the insulating substrate 5 is not constant in width but sliding direction when the throttle is opened. Gradually getting wider. That is, as the width of the resistor plate 10 increases, the resistance value of the resistor plate 10 per unit length decreases. As shown in FIG. 11, when the power supply voltage V _B is supplied, the output voltage of the throttle opening sensor rises logarithmically as shown in FIG. 12 (corresponding to FIG. 5 of Patent Document 2) as the throttle valve opens. However, the increase rate in the region where the opening degree of the throttle valve is small becomes larger than the region where the increase rate is large.

JP 2000-136736 A (page 6, FIG. 2, FIG. 9, FIG. 10) JP 58-93936 (2nd page, FIG. 4, FIG. 5)

  In Patent Document 1, even if the accelerator pedal is erroneously operated (generally called reverse), the accelerator opening θ is in the low output side stepped region, and V1 = constant. Although not output, when the accelerator pedal is depressed, the accelerator opening output does not change until the accelerator opening θ3, so that the accelerator feeling is deteriorated. Further, in Patent Document 2, since the resistance plate is not constant in width and gradually widens in the sliding direction at the time of throttle opening, the gradient of the output voltage increases as the opening degree decreases, that is, a parabolic shape. Therefore, when the accelerator pedal is operated incorrectly, there is a problem that the output voltage greatly deviates. Therefore, the present invention integrally forms a variable region having a large output voltage gradient of a resistive material or a resistor plate (resistor) and an invariable region having a small output voltage gradient, thereby varying the output voltage due to an erroneous operation of the accelerator pedal. It is an object to improve the accelerator feeling by reducing the output voltage and increasing the output voltage when the accelerator pedal is depressed.

  The invention according to claim 1 includes an accelerator arm having an axle pedal at a distal end portion, and a support case for including a base end portion of the accelerator arm and rotatably supporting the base end portion via a support shaft. And a return spring for urging the accelerator arm in a return direction of the accelerator pedal to return the accelerator pedal to an initial position, and an accelerator sensor for detecting the depression amount of the accelerator pedal as an accelerator opening. In the accelerator device, the resistor for measuring the amount of depression of the accelerator pedal can obtain an output voltage in proportion to the amount of depression of the accelerator pedal, and the output voltage is substantially constant with respect to the amount of depression of the accelerator pedal. It is characterized by comprising an invariant region.

  According to the first aspect of the present invention, the fluctuation region of the output voltage due to the erroneous operation of the accelerator pedal is reduced by integrally forming the variable region where the output voltage gradient of the resistor is large and the constant region where the gradient of the output voltage is small. Increase the accelerator opening change when the accelerator pedal is depressed.

  Invention of Claim 2 is invention of Claim 1, Comprising: The said variable area | region contains the area | region from the depression start vicinity position of an accelerator pedal to the depression end vicinity position, The said invariable area | region is the said accelerator. It includes a region from a position near the start of depression of the pedal to a position where the depression starts.

  According to the second aspect of the present invention, even if the accelerator pedal is erroneously operated, the change in the accelerator opening at the position near the start of depression of the accelerator pedal is reduced, and the change in the accelerator opening when the accelerator pedal is depressed is increased.

  Invention of Claim 3 is invention of Claim 1 or 2, Comprising: The width | variety of the resistor which forms the said invariable area | region was made larger than the width | variety of the resistor which forms the said variable area | region. To do.

  There exists an effect | action similar to Claim 2.

  As an effect of the above invention, since the variable region and the constant region are formed in the resistor, the fluctuation of the output voltage when the accelerator pedal is depressed due to an erroneous operation of the accelerator pedal is small, and therefore the influence on the control of the throttle opening during idling. The output voltage changes greatly when the accelerator pedal is depressed, and the accelerator feeling does not decrease.

  Embodiment 1 of the present invention will be described in detail with reference to the drawings. 1 is a perspective view of the accelerator device, FIG. 2 is an exploded perspective view of the accelerator device, FIG. 3 is an exploded perspective view of the accelerator device, FIG. 4 is a partial sectional view of the accelerator sensor, and FIG. 6 and 6 are plan views of the substrate.

  In this embodiment, an accelerator device used in an electronic throttle control device for a vehicle engine will be described. This accelerator device has, as a basic configuration, an accelerator arm 12 having an accelerator pedal 11 at the tip, a support case 13, a support shaft 14, an accelerator sensor 15, and a pair of return springs 16 made of a metal coil spring, 17.

  The accelerator petal 11 is integrally formed at the tip of the accelerator arm 12. A stopper 11 a extending downward is integrally formed on the lower side of the accelerator pedal 11. When the accelerator pedal 11 is depressed, the stopper 11a makes the driver sense that the driver is fully open by hitting the floor. The support case 13 includes a base end portion (hereinafter referred to as “arm base end portion”) 12 a of the accelerator arm 12, and supports the arm base end portion 12 a through the support shaft 14 so as to be rotatable. belongs to. The accelerator arm 12 can be rotated together with the accelerator pedal 11 between an initial position indicated by a solid line in FIG. 1 and a fully open position indicated by a two-dot chain line in FIG. The pair of return springs 16 and 17 are for urging the rotation of the accelerator arm 12 in the return direction in order to return the accelerator pedal 11 to the initial position. The two return springs 16 and 17 can function as the fail-safe when one of them is broken. The accelerator sensor 15 is for detecting the depression amount of the accelerator pedal 11 as the accelerator opening. The accelerator sensor 15 is accommodated in a sensor case 18 formed integrally with the support case 13. A socket 18 a that encloses a wiring terminal is integrally formed on the upper part of the sensor case 18.

  In order to improve the operation feeling of the accelerator pedal 11, the support case 13 is provided with a friction member 19 including a contacted surface 19 a in order to give hysteresis to the pedaling force when the accelerator pedal 11 is depressed and returned. It is done. The arm base end portion 12a is provided with a pair of friction pieces 20 and 21 having contact surfaces 20a and 21a that contact with the contacted surface 19a. In this embodiment, the friction pieces 20, 21 have a substantially arc shape, and the contact surfaces 20 a, 21 a are provided from one end to the other end inside the arc of the friction pieces 20, 21. And in order to produce friction, while making each contact surface 20a, 21a contact the to-be-contacted surface 19a of the friction member 19, one end of each friction piece 20, 21 is attached to the arm base end part 12a. Further, in order to press the contact surfaces 20a and 21a of the friction pieces 20 and 21 against the contacted surface 19a of the friction member 19, the ends 16a and 17a of the return springs 16 and 17 correspond to the corresponding friction pieces 20 and 21. Are connected to hooks 20b, 21b formed at the other end of the. The other ends 16 b and 17 b of the return springs 16 and 17 are connected to a hook 13 a formed on the support case 13. In this embodiment, the friction member 19 is formed separately from the support case 13 and is incorporated in the support case 13.

  As shown in FIG. 5, the accelerator sensor 15 includes a sensor lever 15a, a brush 15b attached to the lever 15a, and a substrate 30 corresponding to the brush 15b. The center of the sensor lever 15a is fitted into a pin 13b projecting from the support case 13, and is incorporated into the sensor case 18 via a coil spring 31 and a wave ring 32, and is sealed by a lid 18b. The sensor lever 15a is rotatable around the pin 13b. The pin 15c projecting from the sensor lever 15a is incorporated and connected to a hole 33 formed in the side surface of the arm base end portion 12a. Accordingly, when the hole 33 is rotated together with the arm base end portion 12a, the sensor lever 15a is rotated and replaced with the movement range of the brush 15b with respect to the substrate 30, and the accelerator opening corresponding to the rotation amount is determined by the accelerator sensor 15. Is detected.

  As shown in FIG. 6, on the substrate 30 made of glass epoxy resin, a conductor 34 and a resistor 35 are formed by stacking one layer or two or more layers of the same material, and two sets are printed in an arc shape and fired. The The thickness of the resistor 35 is constant (for example, 0.03 mm), but the region 35a where the width of the resistor 35 is narrow (for example, 79.1 mV / °) and the region where the width of the resistor 35 is narrower than the region 35a. A pattern consisting of 35b (for example, 59.3 mV / °) is formed. The electric circuit is schematically shown in FIG. The right end 35 c of the resistor 35 a is connected to the + B terminal of the battery 37. The left end 35 d of the resistor 35 is connected to the GND terminal of the battery 37. The output terminal 38 of the substrate 30 is connected to the right end 34 a of the conductor 34. A GND terminal (ground terminal) 39 of the substrate 30 is connected to the left end 35 d of the resistor 35.

  Two pairs of conductive brushes 15c formed in a U shape on the upper surfaces of the arc-shaped resistor 35 and the conductor 34 slide. When the accelerator pedal 11 is depressed, the brush 15b is between the depression start point θa and the depression start vicinity point θb. When the accelerator pedal 11 is depressed, the brush 15b exists between the depression start vicinity point θb and the depression end point θc. When the accelerator pedal 11 is fully depressed, the depression end point θc is reached. That is, the accelerator opening is fully opened. The gradient is small with a slight output voltage from the depression start point θa of the accelerator pedal 11 to the depression start vicinity point θb. This wide area corresponds to an invariable area defined in the claims. The resistance value linearly changes from the accelerator pedal depression start vicinity point θb to the depression end point θc, but the gradient is considerably larger than that of the unchanged region. This narrow region corresponds to a variable region defined in the claims.

  Next, the operation will be described. As shown by a solid line and a two-dot broken line in FIG. 1, the accelerator arm 12 has its base end portion 12 a rotated with respect to the spindle case 13 as the accelerator pedal 11 is stepped on or returned. At that time, by rotating the hole 33 together with the arm base end portion 12a, the sensor lever 15a is rotated to replace the resistor 35 of the substrate 30 with the movement range of the brush 15b, as shown in FIG. The accelerator opening corresponding to the rotation amount θ is detected by the accelerator sensor 15. When the accelerator pedal 11 is depressed, the accelerator pedal 11 is depressed against the drag of the return springs 16, 17. Therefore, the output voltage of the accelerator sensor 15 changes linearly, but when the accelerator pedal 11 is depressed, the return springs 16, 17 The accelerator pedal 11 moves from the variable region to the invariable region by the return force.

  The accelerator sensor 15 receives signals from the vehicle speed sensor and the idle switch, performs feedback control by an electronic control unit (ECU), and specifies the output voltage when the accelerator sensor 15 is idle. This is the position of θi shown in FIG. However, depending on the driver, there is a case where the accelerator pedal 11 is erroneously operated from this position, that is, an operation of lifting the accelerator pedal (generally referred to as upside down) is performed, whereby the accelerator opening changes in the closing direction θid. As a result, the ECU determines that this position is the idle position and performs feedback control, so that the fully closed position of the accelerator opening is shifted. However, since the gradient of the output voltage in the invariant region is set small, the influence on the idle opening is small. Further, when the accelerator pedal 11 is depressed, the output voltage of the accelerator sensor shifts from a small gradient to a large gradient, so that there is an effect that the accelerator feeling is not different from the conventional one.

  As an application example of the present invention, it can be used as a throttle sensor of an electronic throttle control device.

  It is a perspective view which shows the accelerator apparatus of Example 1. FIG.   It is a disassembled perspective view which shows the accelerator apparatus of Example 1. FIG.   It is a disassembled perspective view which shows the accelerator apparatus of Example 1. FIG.   It is a partial cross section figure of the accelerator sensor of Example 1. FIG.   2 is a longitudinal sectional view showing the inside of a support case of Example 1. FIG.   2 is a plan view of a substrate according to Example 1. FIG.   It is an opening characteristic diagram of Example 1. FIG.   It is a partially omitted sectional view showing a conventional accelerator opening sensor.   It is a side view which shows the conventional accelerator unit.   It is a graph which shows the output voltage characteristic with respect to the accelerator opening in the conventional accelerator opening sensor.   It is a figure which shows a part of conventional throttle opening sensor.   It is an output characteristic figure of the conventional throttle opening sensor.

Explanation of symbols

12: accelerator arm 13: support case 15: accelerator sensor 16, 17: return spring 35: resistor 35a: narrow area (variable area)
35b: Wide area (invariant area)

Claims (3)

An accelerator arm having an axle pedal at the tip, a support case for containing the base end of the accelerator arm and rotatably supporting the base end via a support shaft, and the accelerator pedal to an initial position In an accelerator device comprising: a return spring that urges the accelerator arm in the return direction of the accelerator pedal to return; and an accelerator sensor for detecting the amount of depression of the accelerator pedal as an accelerator opening;
A variable region in which the resistor that measures the amount of depression of the accelerator pedal can obtain an output voltage in proportion to the amount of depression of the accelerator pedal, and an invariable region in which the output voltage is substantially constant with respect to the amount of depression of the accelerator pedal; An accelerator device comprising:   The variable region includes a region from a position near the start of depression of the accelerator pedal to a position where the depression ends, and the invariable region includes a region from a position near the start of depression of the accelerator pedal to a position where the depression starts. Item 2. The accelerator device according to item 1.   3. The accelerator apparatus according to claim 1, wherein a width of the resistor forming the invariable region is larger than a width of the resistor forming the variable region.

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