KR20130066333A - Electric vehicle and control method thereof - Google Patents

Abstract

PURPOSE: A controlling method of an environmental vehicle is provided to increase accuracy of distinguishing a noise signal and a malfunction signal by changing gain to a sensor input signal. CONSTITUTION: A controlling method of an environmental vehicle comprises a step of measuring signals of a voltage conversion part; a step of changing and inputting the gain of the measured signal; a step of comparing the input signal value with a preset standard signal, and generating malfunction signal or normal signal; a step of controlling PMN signal according to the malfunction signal or normal signal, and determining the malfunction of the electricity conversion part, to control driving of a vehicle. [Reference numerals] (123) Comparing machine; (125) Vibrator; (140) Processing part; (150) PWM control part; (AA) Signal input; (BB) Vref(standard signal); (CC) Low output when malfunctioning; (DD) PWM output on/off; (EE) PWM output signal

Description

Control method of environmental vehicle

The present invention relates to a method for controlling an environmental vehicle, and more particularly, to a method of detecting a failure of a power converter by a sensor input signal whose gain has been changed and controlling the running of the vehicle accordingly.

Environmental vehicles are being actively researched in that they are the most likely alternative to solve future automotive pollution and energy problems.

The environmental vehicle may be an electric vehicle, for example, an electric vehicle (EV) is a vehicle that is mainly powered by an AC or DC motor using a battery power source. The electric vehicle for exclusive use of the battery drives the motor by using the power of the battery, recharges when the power is exhausted, and the hybrid electric vehicle operates the engine to generate electricity to charge the battery and to use the electricity The car can be driven by driving the motor.

The hybrid electric vehicle can be classified into a serial system and a parallel system. In the serial system, the mechanical energy output from the engine is converted into electrical energy through the generator, and the electric energy is supplied to the battery or the motor. This is a concept that adds an engine and a generator to increase the mileage of an existing electric vehicle. The parallel method can move a car by battery power. It is also possible to use two motors (gasoline or diesel) Depending on the driving conditions, the parallel system can drive the vehicle at the same time as the engine and the motor.

The environmental vehicle converts the high voltage of the battery into an appropriate voltage for each module of the vehicle by using the power converter, and the power converter detects the failure in a short time if the failure occurs due to the characteristics of the system using the high voltage. Protective action for However, when the fast fault detection and protection operation is performed, there is a problem that a fault may be detected by noise and other distortion signals.

Accordingly, an object of the present invention is to change the gain of the sensor input signal of the power converter to increase the accuracy of the noise signal and the failure signal determination, improve the reliability of the failure determination environment to control the running of the vehicle The present invention provides a control method of a vehicle.

In order to achieve the above object, the control method of the environmental vehicle according to the present invention comprises the steps of measuring the signal of the power converter, changing the gain of the measured signal value and input, the received signal value and the predetermined reference signal Comparing the values, generating a fault signal or a normal signal, controlling a PWM signal according to the fault signal or the normal signal, and determining whether the power converter has a fault and controlling driving of the vehicle.

In the control method of the environmental vehicle according to the present invention, the gain for the sensor input signal may be changed to increase the accuracy of discriminating the noise signal from the fault signal.

Therefore, the reliability of failure detection of the power conversion unit can be increased, and the safety and reliability of the environmental vehicle can be improved.

1 is a view schematically showing the internal configuration of an environmental vehicle according to an embodiment of the present invention.
2A is a circuit diagram illustrating a fault detection system of a power converter in an environmental vehicle according to an exemplary embodiment of the present invention, and FIG. 2B is a timing diagram of FIG. 2A.
3 is a flowchart illustrating a method of controlling an environmental vehicle according to an embodiment of the present invention.

Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art. To fully disclose the scope of the invention to those skilled in the art, and the invention is only defined by the scope of the claims. Like reference numerals refer to like elements throughout.

DETAILED DESCRIPTION OF THE INVENTION Hereinafter, the present invention will be described with reference to the drawings for explaining an electric vehicle and a control method thereof according to embodiments of the present invention.

1 is a view schematically showing the internal configuration of an environmental vehicle according to an embodiment of the present invention.

1, an electric vehicle according to an embodiment of the present invention includes a power converter 160, a sensor 110, a comparator 120, a gain changer 130, a processor 140, and a PWM controller. 150, the motor controller 170, and the motor 180 may be included.

The power converter 160 is a device for converting a high voltage of a battery into a suitable voltage used in a vehicle, and may be an inverter, a converter, a charger, and the like, but is not limited thereto.

The sensor unit 110 detects and receives various signals of the power converter 160 generated during a vehicle driving or a predetermined operation, and inputs the signals to the gain change unit 130 or the comparator 120. In this case, the type of sensor may be different according to the installed position.

The comparison unit 120 compares the signal received from the sensor unit 110 or the gain change unit 130 with a preset reference signal value, for example, a reference voltage, to compare the failure signal or the normal signal with the processor 140 and the PWM. Output to the controller 150.

The PWM controller 150 may apply the voltage output from the power converter 160 to the motor controller 170 through the PWM switching. In addition, the PWM controller 170 may cut off the power applied from the power converter 160 to the motor controller 170. When the power supplied to the motor 180 is cut off, the motor 180 stops. The vehicle will also stop.

The motor controller 170 generates a control signal for driving at least one motor 180 connected to the motor controller 170, and generates and applies a predetermined signal for motor control.

The processor 140 operates the timer according to the signal received from the comparator 120, counts the number of failures, and determines whether the power converter 160 has failed. In addition, according to a failure result, a signal is applied to the PWM controller 150 to control the driving of the vehicle.

2A is a circuit diagram illustrating a fault detection system of a power converter in an environmental vehicle according to an exemplary embodiment of the present invention, and FIG. 2B is a timing diagram of FIG. 2A.

Referring to FIG. 2A, the sensor unit 110 measures the signal of the power converter 160 and inputs it to the comparator 120. In this case, the signal of the power converter 160 may be an output voltage, and the comparator 120 may include a comparator 123 and a vibrator 125. However, it is not limited thereto.

The sensor unit 110 inputs the signal measured as the gain changer 130 is on / off to the comparator 123 with a normal gain, or changes the gain of the measured signal to lower the gain. (low gain) can be input to the comparator 123.

The comparator 123 compares the input signal value with a preset reference signal value and outputs a low signal when the input signal is larger than the reference signal, and outputs a low signal when the input signal is smaller than the preset reference signal. Output a high signal.

The gain changer 130 receives the signals of the comparator 123 and the processor 140 and inputs the measured signals to the comparator 123 as normal gain or low gain. Judge.

The gain change unit 130 may be configured as a voltage divider 133 using a NAND gate 135 and a resistor, but is not limited thereto.

The NAND gate 135 receives a signal from the comparator 123 and a signal from the processor 140. The processor 140 outputs a low signal when the operation time timer is operated after a failure signal is detected. Output a high signal.

Therefore, when the signal input to the comparator 123 is larger than the reference signal or the operation time timer operation is performed after the detection of the fault signal, the NAND gate 135 outputs a high signal to the sensor unit 110. The measured signal is passed through the voltage divider 133 and input to the comparator 123. Accordingly, a low gain signal is input to the comparator 123 by the voltage divider 133 composed of R1 and R2 by the ratio R2 / (R1 + R2).

The comparator 123 compares the low gain signal with the reference signal, and outputs a fault signal that is a low signal when the low gain signal is greater than the reference signal, and low gain. ) When the signal is smaller than the preset reference signal, a normal signal that is a high signal is output.

The vibrator 125 inputs the signal received from the comparator 123 to the PWM controller 150 and the processor 140.

The PWM controller 150 may control to stop outputting the PWM signal for a predetermined time when the failure signal is input.

When the processor 140 receives a failure signal, the processor 140 counts the number of failures and operates the operation time timer after the failure. In addition, by comparing the number of failures and the preset limit number of times during the driving time after the failure, it is possible to determine the failure of the power converter 160, and to control the running of the vehicle.

Referring to FIG. 2B, referring to the signal value in Node A of FIG. 2A, first, a signal value is initially input with normal gain and a signal input with the comparator 123 is larger than a reference signal value. The input signal is changed into a low gain for a predetermined time t from the time A entered, but the low gain signal becomes less than or equal to the reference signal value, and the normal gain signal is returned to the comparator 123 again. Is input.

When an input signal larger than the reference signal value is input again, the input signal is changed to low gain, and the input signal is changed to low gain so that the timer starts from the time point B when the input signal is larger than the reference signal value. The vibrator 125 outputs a low signal for a predetermined time T2.

 During the time T1 when the timer is running, the signal changed to low gain is continuously input. When the timer operating time T1 ends, a normal gain signal is input again.

Therefore, when a low gain signal is input for noise, the low gain signal is smaller than the reference signal value, thereby reducing the probability of false detection due to noise, which reduces reliability of failure detection. Can be improved.

3 is a flowchart illustrating a method of controlling an environmental vehicle according to an embodiment of the present invention.

The sensor unit 110 measures the signal of the power converter 160 and inputs it to the comparator 123 (S210). The comparator 123 compares the input signal with a preset reference signal value (S220), and when the input signal is equal to or less than the reference signal or when a timer for measuring time after failure does not operate, the vibrator 125 receives a normal signal. The high signal is output to the PWM controller 150 and the processor 140 (S223). The PWM controller 150 receiving the normal signal turns on the PWM signal, and the processor 140 controls the driving of the vehicle in the normal state (S225).

On the other hand, when the input signal is larger than the reference signal or when the timer measuring time after the failure is in operation, the signal of the power converter 160 is changed to a low gain by the gain changer 130. The input to the comparator 123 (S230).

The comparator 123 compares the low gain signal with the reference signal value (S235), and when the low gain signal is less than or equal to the reference signal, the vibrator 125 outputs a normal signal (S223).

On the other hand, when the low gain signal is greater than the reference signal, the vibrator 125 outputs a low signal, which is a failure signal, to the PWM controller 150 and the processor 140 (S240). The PWM controller 150 receiving the failure signal turns off the PWM signal for a predetermined time, and the processor 140 operates a timer to measure the time after the failure, and counts the number of failures during the preset time T1. It counts (S245).

The processor 140 compares the number of failures with a preset limit and compares the time measured by the timer with the set time T1 (S250, S255, and S260).

If the number of failures is equal to or less than the number of times of recall and the timer time is less than or equal to the set time T1, the vibrator 125 outputs a normal signal (S223).

If the number of failures is greater than the limit and the timer time is less than or equal to the set time T1, the processor 140 determines the failure of the power converter 160, stops the operation, and turns off the PWM signal. (S265).

Even if the number of failures is greater than the limit and the timer time is greater than the set time T1, the processor 140 determines the failure of the power converter 160, stops the operation, and turns off the PWM signal. (S265).

If the number of failures is less than the limit and the timer time is greater than the set time (T1), the timer is initialized, the number of failures are reset to zero (S270), and the processor 140 controls the vehicle to run in a normal state. , Turns on the PWM signal (S280).

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It should be understood that various modifications may be made by those skilled in the art without departing from the spirit and scope of the present invention.

110: sensor unit 120: comparison unit
130: gain change unit 140: processing unit
150: PWM controller 160: power converter
170: motor control unit 180: motor

Claims (7)

Measuring a signal of the power converter;
Changing and inputting a gain of the measured signal value;
Generating a fault signal or a normal signal by comparing the input signal value with a preset reference signal value; And
Controlling a PWM signal according to the fault signal or a normal signal, and determining whether a failure of the power converter is performed to control driving of the vehicle. The method of claim 1,
The method may further include comparing the measured signal value with the preset reference signal value.
And controlling the gain of the measured signal value when the measured signal value is larger than the reference signal value. The method of claim 1,
When the fault signal is generated, the control method of the environmental vehicle to control not to output the PWM signal for a predetermined time. The method of claim 1,
When the failure signal is generated, counting the number of failures, the control method of the environmental vehicle to determine whether the power failure of the power conversion unit by comparing the number of failures with a preset limit. 5. The method of claim 4,
And controlling the number of failures for a preset time period from the time when the failure signal occurs. The method of claim 5,
And determining that a failure of the power conversion unit is greater than the limiting number within the reference time, and stopping driving of the vehicle. The method of claim 5,
And if the number of failures is not greater than the limit number within the set time, initialize the number of failures to zero.

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