JP4604813B2 - Dynamometer throttle actuator - Google Patents

Description

  The present invention relates to a dynamometer that performs a running test of an automobile and a power test of an engine and a power transmission system, and in particular, for controlling the speed and output torque of the engine and the power transmission system by controlling the throttle opening of the automobile engine. Related to the throttle actuator.

  FIG. 2 shows a configuration example of a dynamometer and shows a case of engine output torque control (see, for example, Patent Document 1). A dynamometer 2 as a load device is coupled to the output shaft of the engine 1, and the engine output torque is detected by a torque detector 3. The throttle actuator includes an actuator body 4 that drives a throttle 1A of the engine 1 and a controller 5 that controls the actuator body 4.

  The actuator body 4 is controlled in rotational speed or rotational angle of a direct current or alternating current servo motor 4A, and rotates the pulley 4D via the clutch 4B and the gear 4C with this rotational output, and the pulley 4D rotates to make a stroke. The wire 6 is wound up, and the opening degree of the throttle 1A is changed depending on the amount of the wire 6 wound up. The clutch 4B is normally turned on and is turned off at the end of one test or at the time of power failure, thereby releasing the coupling between the motor 4A and the pulley 4D. Thereby, the rotation of the pulley 4D is returned to the initial position by the pulling force of the return spring 1B of the throttle 1A, and the throttle 1A is returned to the zero point to make it fully closed (opening degree 0).

  The controller 5 performs a PI (proportional integration) calculation of a deviation between the torque command T * and the detected torque T by the torque control unit 5A, and outputs a throttle opening command θ * as a result of the calculation. The throttle opening control unit 5B obtains a control signal for the servo motor 4A by PI calculation with respect to the deviation between the rotation angle θ of the pulley 4D detected by the angle detector 7 having a potentiometer configuration and the throttle opening command θ *. The power converter 5C is configured as a DC chopper or an AC driver, and supplies a voltage or current output corresponding to the control signal to the servo motor 4A. The clutch control unit 5D controls the clutch 4B to be turned off at the end of the test or when a power failure is detected.

As shown in FIGS. 3A and 3B, the throttle actuator configured as described above is close to the engine 1 because the actuator body 4 requires a wire connection with the throttle of the engine 1. The controller 5 is housed integrally with another measurement control device such as a sequencer and installed in a test management room, and a power cable and a signal line are laid between the two. Further, the power necessary for the actuator body 4 (control power for the angle detector 7 and the like) is supplied from the controller 5 side.
Japanese Patent Laid-Open No. 7-133739

  As described above, the actuator main body 4 and the controller 5 are separated from each other, and the voltage / current decrease and signal attenuation / response delay in the power cable, signal line and DC power supply line laid between them are the control performance. May have an effect.

  For this reason, the distance between the two is limited to about 20 m, and circuit design that takes into account the effect on control performance (control unit gain and time constant design, change of power cable and power line constants and coaxial of signal lines) There was a problem that required cable).

  Next, the motor 4A and the pulley 4D are connected by a clutch 4B and a gear 4C, and the clutch 4B is turned off at the end of the test or when a power failure occurs. In the off control of the clutch 4B, the pulley 4D is mechanically returned to the zero point, the throttle 1A is fully closed, and the opening degree control of the throttle 1A is started from the initial position when the next test or test is resumed. In such clutch off control, the clutch off control eliminates the restraining force between the motor 4A and the pulley 4D, and the backlash of the gear appears as an error in the throttle opening control in the next test, resulting in a highly accurate throttle. Opening control was not possible.

  An object of the present invention is to provide a throttle actuator for a dynamometer that solves the above problems.

  In order to solve the above-mentioned problems, the present invention has a conventional actuator body and a controller that are integrated with each other and arranged near the engine position. Further, the clutch is omitted between the motor and the pulley, and the pulley is directly connected only by the gear. In this initial position control, the throttle opening fully closed control is performed and has the following configuration.

(1) A throttle actuator of a dynamometer that controls the speed and output torque of the engine or power transmission system by controlling the throttle opening of the engine,
An actuator that changes the throttle opening of the engine through a wire by the rotation of a pulley driven by a servo motor, and the rotation speed or rotation of the servo motor according to a speed command or torque command and a detected rotation angle of the pulley The controller for controlling the angle is integrated.

(2) The actuator body has a configuration in which the output shaft of the servo motor is directly connected to the pulley via a gear,
The controller includes a charging circuit capable of supplying control power for the servo motor when a power failure occurs, and a throttle opening fully-closed control means for returning the pulley to an initial position by the servo motor control when the power failure occurs or at the start of the next test It is characterized by having.

  As described above, according to the present invention, the conventional actuator main body and the controller are integrated and arranged near the engine position, and the motor and the pulley are omitted from the clutch and are directly connected only by the gear, and the initial pulley Since the throttle opening fully closed control is performed in the position control, the following effects are obtained.

  (1) By integrating the actuator body and controller, the power cable, signal line and DC power line connecting the actuator body and controller are shortened to the shortest length, and control performance by these connection lines is reduced. The circuit design that eliminates the influence and considers the control performance becomes unnecessary.

  (2) Since the motor and the pulley are always connected, the backlash of the gear does not enter as an error between the motor rotation position and the rotation angle of the pulley.

  (3) Since the charging circuit is provided, the throttle opening control can be resumed with high accuracy when a power failure occurs and at the next test.

  FIG. 1 is a configuration diagram of a dynamometer showing an embodiment of the present invention, and components equivalent to those in FIG. 2 are denoted by the same reference numerals.

  The throttle actuator 10 has the actuator body 4 and the controller 5 shown in FIG. 2 as a unitary structure and is disposed in the vicinity of the engine 1 to obtain a connection by the wire 6 between the pulley 4D and the throttle 1A.

  The torque command T * that is input to the throttle actuator 10 is taken in through the signal line from the test management room side in which other measurement control devices and the like are accommodated. The detection signal of the torque detector 3 is taken into the throttle actuator 10 via the test management room or directly.

  As described above, in the present embodiment, the power cable, the signal line, and the DC power supply line that connect between the actuator body 4 and the controller 5 are shortened to the shortest length by integrating the conventional actuator body 4 and the controller 5 together. Thus, the influence of the connection lines on the control performance is eliminated, and the circuit design considering the control performance becomes unnecessary. This is particularly effective when a new throttle actuator is installed in place of the existing actuator body or controller.

  Next, the throttle actuator 10 is configured such that the conventional clutch 4B is omitted and the output shaft of the motor 4A is directly connected to the pulley 4D via the gear 4C. In addition to this configuration, a charging circuit 11 is provided for enabling control of the motor 4A for a certain period of time during a power failure, so that power necessary for controlling the motor 4A can be supplied to the power converter 5C and the throttle opening degree control unit 5B. . In this motor control, as a throttle opening command θ * to the throttle opening control unit 5B, a fully closed set value θ * = 0 stored in the throttle fully closed position memory 12 is used instead of that from the torque control unit 5A. Given, the rotation angle detection value of the pulley 4D by the angle detector 7 is used as a feedback signal to perform the fully closed control of the throttle 1A.

  The memory 12 stores the detected angle of the angle detector 7 as an initial set value after the pulley 4D and the throttle 1A are coupled by the wire 6, in addition to the fully closed control of the throttle 1A at the time of power failure, It is also used for initial position control of the pulley 4D at the start of the test.

  Thus, in this embodiment, since the conventional clutch is omitted and the motor 4A and the pulley 4D are always coupled, the backlash of the gear is an error between the rotation position of the motor 4A and the rotation angle of the pulley 4D. The throttle opening control can be resumed with high accuracy when a power failure occurs and at the next test.

  Further, even when a slack is generated in the wire 6 due to the release of the binding force of the pulley 4D, it can be accurately returned to the initial position by the opening degree 0 control.

  Although the embodiment shows the case of torque control, it can be applied to a dynamometer that controls the speed of an engine or a power transmission system by throttle control, and the same effect can be obtained.

The block diagram of the dynamometer which shows embodiment of this invention. The structural example of the conventional dynamometer. An example of a connection form between a conventional actuator body and a controller.

Explanation of symbols

1 Engine 2 Dynamometer 3 Torque detector 4 Actuator body 5 Controller 6 Throttle wire 7 Angle detector 10 Throttle actuator 11 Charging circuit 12 Memory

Claims (2)

A dynamometer throttle actuator that controls the speed or output torque of the engine or power transmission system by controlling the throttle opening of the engine,
An actuator that changes the throttle opening of the engine through a wire by the rotation of a pulley driven by a servo motor, and the rotation speed or rotation of the servo motor according to a speed command or torque command and a detected rotation angle of the pulley A throttle actuator for a dynamometer, characterized in that a controller for controlling the angle is integrated. The actuator body has a configuration in which the output shaft of the servo motor is directly connected to the pulley via a gear,
The controller includes a charging circuit capable of supplying control power for the servo motor when a power failure occurs, and a throttle opening fully-closed control means for returning the pulley to an initial position by the servo motor control when the power failure occurs or at the start of the next test A throttle actuator for a dynamometer according to claim 1.

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