JP4045225B2 - Motor position control device - Google Patents

Description

  The present invention relates to a motor position control device for the purpose of causing an object to reach a target position or target angle based on motor position information, and in particular, to control a variable blade angle in a turbocharger of an automobile to increase a pressurizing pressure. The present invention relates to a control method in a case where the control device to be controlled is in a high temperature environment, and relates to controlling a power source of a motor position control device which is a sub control device on the main control device side.

  Conventionally, when an electronic control device for engine control is mounted on the vehicle, the ambient temperature of the electronic control device exceeds the operation limit temperature of the electronic control device even in the worst case so as not to exceed the operating temperature range of electronic components such as CPU. It is installed in a place where there is no operation, and measures are taken so as not to exceed the operating limit temperature including the heat generation of the control circuit itself during operation.

  However, since the control device for adjusting the variable blade angle in the turbocharger to obtain the desired boost pressure is installed in the immediate vicinity of the turbocharger, the operating temperature is suppressed below the operating limit temperature. Difficult to do. In this regard, there is Patent Document 1 as a known example.

  The present invention is characterized in that the output stage is shut off by detecting that the element of the output stage has abnormally generated heat by another heat generation detection circuit.

JP 2002-151970 A

  However, in the case of this known example, when the ambient temperature of another heat generation detection circuit for detecting the heat generation in the output stage is equal to or higher than the operating temperature of this heat generation detection circuit, it cannot be expected to function normally, or a circuit failure may occur. There may be.

  The present invention has been devised as a method for avoiding the above-mentioned state. By shutting off the power shut-off element of the motor position control device from the external control device, the motor control device is again set in the high temperature state after the engine is stopped. When the power is turned on again, the motor position control device is not operated, and when the ambient temperature decreases thereafter, the power is turned on so that the ambient temperature of the motor control position device can be reduced to the operation limit value or less.

  When the power of the motor position control device is energized in an environment that is equal to or higher than the operation limit temperature of the motor position control device, it is possible to prevent a failure due to the destruction of the control device.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of the present invention.

  When the ignition switch IG SW is energized, the engine control device 1 turns on the engine control cutoff relay 4 to start supplying power and start engine control. The engine control device 1 outputs a signal for controlling the power shut-off device 3 of the motor position control device 2 at the same time, and controls the power shut-off device 3 according to the control algorithm in the engine control device 1.

  In FIG. 1, the interrupting device uses a relay which is an electromechanical contact. However, this interrupting device can achieve the same effect even if a semiconductor-made communication element is used. Even if it is set in the device 2 or the engine control device 1, the same effect can be obtained.

  In addition, a temperature sensor for detecting the ambient temperature in the vicinity of the motor position control device or an engine water temperature sensor is set in the engine control device, and this signal is taken into the engine control device, so that the engine control device can control the ambient temperature of the motor position control device. Control such as energization of the motor position control device is also possible.

  FIG. 2 shows the configuration of a motor position control apparatus according to an embodiment of the present invention.

  The variable blades in the turbocharger 6 are pushed in and pulled out via the gear 12a-pinion gear 12b-wheel gear 12c-rod 9-movable link 6a provided on the motor output shaft. The angle of 6a changes. By changing the angle of the variable blade, the cross-sectional area of the intake air introduction path in the turbocharger is changed, and the supply pressure of the turbocharger is changed.

  In addition to the gear 2-a, rotary encoders 10A and 10B for detecting the rotational position of the motor are provided on the motor output shaft 12-e.

  In this embodiment, two incremental encoders are used.

  The encoder 3 is provided with Hall elements 11A and 11B for converting the rotational position into a signal, and the rotational position of the encoder is converted into a signal and input to the control device 7.

  FIG. 4 shows a signal waveform from the encoder described above.

  Table 1 shows a signal processing method of the encoder signal.

  The ΦA signal and the ΦB signal are 90 degrees out of phase. For example, by looking at the level of the ΦB signal at the rise or fall of ΦA, the rotation direction of the motor can be determined, and by counting the number of pulses of the signal, It is possible to detect the rotational position. On the other hand, the control target position signal 8a of the turbocharger motor rotation position (turbocharger inner rotor blade angle) is inputted from the other control device 8 to the control device 7, and the control device 7 has the same motor rotation position as the control target position signal 8a. In this system, a signal 7a for driving the motor 12 is output so that the rotational position of the motor 12 is controlled according to the control target position signal 8a.

  In this embodiment, the motor position of the motor position control device is detected by signals of two incremental encoders. However, the number of encoders can be increased, an absolute type encoder or a contact type or non-contact type potentiometer can be installed. The same applies to the absolute position detection device used.

  FIG. 3 shows an internal block diagram of the control device 1 of the present embodiment.

CPU9 (Central Processing Unit), I / O14 (Input / Output), A / D18
(Analog to Digital converter), RAM15 (Random Access Memory), ROM16
(Read Only Memory), a non-volatile memory 17, a motor driver 10, and a communication driver 13, and in the case of this embodiment, the target opening signal 13a inputted to the communication driver and the value of the rotational position signal 11 of the motor are equal. The control signal 9a is output to the motor driver 10 as described above.

  The CPU 9 has a function of reading a control arithmetic expression from the ROM 16 and holding the calculated value in the RAM 15.

  The non-volatile memory is used when it is desired to retain the calculation data and the like even after the control device is turned off, and may not be provided if there is no data to be retained.

  When a potentiometer is used, the signal is analog data, so the gear position is detected via the A / D 14.

  FIG. 5 shows the operation state of this embodiment, and FIG. 7 shows the operation logic of FIG.

  The engine control unit starts energizing the engine control unit after turning on the ignition switch, then monitors the engine water temperature, calculates the delay time to start energizing the motor control unit according to the water temperature state at this time, and calculates the internal timer Is activated and energization of the motor position control device is started after the delay time Td has elapsed.

  In the prior art, since the motor position control device is energized simultaneously with the start of energization of the engine control device, when the engine control device is turned on immediately after being turned off as shown in FIG. It is possible that the entire engine will be shut off in the heated state, and may exceed the operating limit temperature of the motor position control device. In the case of the conventional technology, energization is started in the region above the operating limit temperature of the motor. This is not desirable.

  In the present invention, after the ignition switch is energized by the logic of FIG. 7, the engine control device captures the engine water temperature, detects the engine load state with this engine water temperature, and delays Td according to the engine state after the engine restarts. By starting energization of the motor position control device later, it is possible to avoid starting energization in a state of the operation limit temperature or more of the motor position control device, thereby preventing failure of the motor position control device.

  In this embodiment, the engine water temperature is used to detect the engine load state. However, as an alternative, the same control is possible based on the ambient temperature information of the motor position control device, the engine exhaust temperature, the engine oil temperature, and the like.

  FIG. 6 shows an example in which the present invention is implemented according to the ambient temperature of the motor position control device. The ambient temperature of the motor position control device is taken in on the engine control device side, and the motor position control device is energized or not according to the value. The same effect can be obtained by prohibiting energization when energization is controlled and the temperature exceeds the operation limit temperature.

The block diagram of this invention. Motor position control device. Motor position control device. Encoder waveform. Motor position control method. Motor position control method. The operational logic of the present invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Engine control apparatus, 1a ... Engine water temperature signal, 1b ... Motor position control apparatus ambient temperature signal, 2 ... Motor position control apparatus, 3 ... Motor position control apparatus energization apparatus, 4 ... Engine control apparatus energization apparatus, 5 ... Battery, 6 ... turbocharger, 6a ... variable blade, 6b ... rotor, 7 ... control device, 8 ... other control device.

Claims (5)

A main controller for controlling the engine;
A sub-control device for controlling a mechanism related to the control of the engine;
In a control device comprising a switch for energizing and shutting off the power supplied to the sub-control device,
The switch is controlled by the main controller ,
The main control unit, after starting of the engine, the control device for controlling the engine characterized that you control the energization side the switch after a predetermined time has elapsed. The control device according to claim 1 ,
The sub-control device comprises a temperature detecting means for detecting the temperature of the sub-control device itself. The control device according to claim 2 , wherein
The said sub-control apparatus is provided with the means to communicate this temperature to the said main control apparatus, when the temperature more than predetermined is detected by the said temperature detection means. The control device according to claim 3 ,
The said main control apparatus interrupts | blocks the said switch based on the said temperature from the said sub control apparatus, The control apparatus characterized by the above-mentioned. An engine control device for controlling the engine;
A motor position control device for causing the motor to reach a target position based on position information from the motor;
A control device having a switch for energizing or shutting off the power to the motor position control device,
The switch is for energizing or shutting off the power to the motor position control device based on a signal from the engine control device,
When energization of the engine control device is started, the control device takes in the water temperature of the engine, and starts energization of the motor position control device after a lapse of time according to the water temperature of the engine. A control device.

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