KR20120098002A - Glow plug controling apparatus and method for maintaining proper temperature - Google Patents

Abstract

PURPOSE: A system and method for controlling a glow plug for properly maintaining temperature is provided to increase the service life of the glow plug by preventing a temperature rise range and an excessive temperature rise while maintaining the temperature. CONSTITUTION: A system(100) for controlling a glow plug for properly maintaining temperature comprises a current measuring unit(140), a duty setting unit(130), a unit for calculating compensation duty(150), a control signal generating unit(160). The current measuring unit measures the current flowing through the glow plug. The duty setting unit sets a duty cycle using a measured voltage value from a power unit(300) and a PWM(Pulse Width Modulation) signal from an ECU(Electronic Control Unit)(200). The unit for calculating the compensation duty compares the measured current value with the pre-set target current, and calculates a compensation duty cycle using the set duty cycle. The control signal generating unit generates a control signal using the compensation duty cycle. [Reference numerals] (100) System for controlling a glow plug; (110) Operating control unit; (120) Time setting unit; (130) Duty setting unit; (140) Current measuring unit; (150) Unit for calculating compensation duty; (160) Control signal generating unit; (170) IPS unit; (180) Diagnosis signal generating unit; (200) Electronic control unit; (300) Power unit; (310) Power measuring unit; (400) Glow plug; (AA) Key-on signal; (BB) PWM signal; (CC) Diagnosis signal

Description

Glow plug control apparatus and method for maintaining proper temperature

The present invention relates to a glow plug control device and method for maintaining an appropriate temperature, and more particularly to an apparatus and method for preventing overheating and deterioration of performance of the glow plug.

Unlike a gasoline engine, a diesel engine does not use a separate ignition device, and thus, inhales air, compresses it to a high pressure, and injects fuel into air heated to a high temperature due to compression to generate combustion.

However, in winter, since the air in the combustion chamber may not reach the temperature required for self-ignition, an electric heating aid called a glow plug is used.

That is, it arrange | positions so that the heat generating part of a glow plug may protrude in a combustion chamber, preheat it so that the inside of an engine may become warm before starting, and use it as an ignition source at the time of fuel spraying.

In order to rapidly heat up the glow plug, a high energy is instantaneously applied (high current flows instantaneously) to rapidly increase the temperature above the reference temperature, and then the rated energy is applied to maintain a constant temperature.

That is, as shown in FIG. 1 (FIG. 1 is a graph showing a temperature according to a current flowing in a conventional glow plug), the process of preheating the glow plug may be performed by applying a preset current to the glow plug for a predetermined time. It is divided into a rapid heating section 11, which is a section for raising the plug to a temperature that can be preheated, and a temperature holding section 12, which is a section for applying a current for maintaining a target temperature (temperature to be maintained).

However, the above-described conventional glow plug preheating process continuously applies a current initially set, and does not detect a change in durability resistance distribution and heat generation performance of the glow plug due to an engine condition such as a vehicle's driving distance. The overtemperature section 13 in which the temperature does not compensate and rises above the reference temperature occurs.

Since the over-temperature section 13 occurs every time the vehicle is started (Key on), it is possible to shorten the endurance life of the glow plug, which can lead to premature disconnection.

The present invention has been made to solve such a conventional problem, to prevent the occurrence of excessive temperature rise and deterioration interval, the object of the increase in the durability life of the glow plug and prevention of premature disconnection.

In order to achieve the above object, the glow plug control apparatus capable of temperature compensation according to the present invention includes a current measuring unit, a duty setting unit, a compensation duty calculating unit, and a control signal generating unit.

The current measuring unit measures the current value flowing through the glow plug, and the duty setting unit sets the duty cycle of the pulse width modulated signal using the pulse width modulated signal received from the electronic controller and the measured voltage value of the voltage applied from the power supply unit. .

In addition, the compensation duty calculator calculates a compensation duty cycle according to the current value to be compensated by comparing the preset target current with the measured current value using the set duty cycle, and the control signal generator uses the compensation duty cycle. Generates a control signal to control the voltage supply during the temperature maintenance interval.

For this reason, the occurrence of overheating and a deterioration period in the conventional glow plug can be prevented, and an increase in the endurance life and early disconnection of the glow plug can be prevented.

In addition, since the glow plug can use only a heating coil, the current flowing through the glow plug can be adjusted only by adjusting the voltage.

In addition, the duty setting unit may set the duty cycle by using the pulse width modulated signal data received from the electronic controller instead of the pulse width modulated signal.

In addition, the duty setting unit may set the duty cycle by using a current value to be applied to the glow plug instead of the pulse width modulated signal.

In addition, the glow plug control apparatus capable of temperature compensation according to the present invention may further include an IPS unit. The IPS unit may apply the voltage supplied from the power supply unit to the glow plug according to the control signal and check the state of the glow plug.

In addition, the glow plug control apparatus capable of temperature compensation according to the present invention may further include a diagnostic signal generator, which receives a status check result of the glow plug from the IPS unit, and flows through the glow plug during the temperature maintenance period. If the current does not match the current supplied, a diagnostic signal can be generated and sent to the electronic control device.

In addition, the glow plug control apparatus capable of temperature compensation according to the present invention may further include a time setting unit for setting the time of the rapid heating section using the measured voltage value, wherein the control signal generation unit Can be used to generate a control signal that controls the voltage supply during the rapid ramp up period.

In addition, the diagnostic signal generator may generate a diagnostic signal according to the abnormal state of the glow plug confirmed by the IPS unit during the rapid heating section, and transmit the diagnostic signal to the electronic controller.

In order to achieve the above object, a glow plug control method capable of temperature compensation according to the present invention includes the steps of: (f) the glow plug control device measuring a current value flowing through the glow plug, and the glow plug control device receiving a pulse from the electronic control device (G) setting the duty cycle of the pulse width modulated signal by using the width modulated signal and the measured voltage value of the voltage applied from the power supply unit, and the current measured in the preset target current and the step (f) by the glow plug control device. (H) calculating the duty cycle of the compensation according to the current value to be compensated using the set duty cycle by comparing the values, and the glow plug control device controls the voltage supply during the temperature maintenance period using the compensation duty cycle. (I) generating a control signal.

In addition, in step (g), the glow plug control device may set the duty cycle by using the pulse width modulated signal data received from the electronic controller instead of the pulse width modulated signal.

Further, in step (g), the glow plug control device may set the duty cycle by using a current value to be applied to the glow plug received from the electronic control device instead of the pulse width modulated signal.

In addition, the glow plug control method capable of temperature compensation according to the present invention may further include (j) after the step (i), the glow plug control device applying a voltage supplied from the power supply unit to the glow plug according to the control signal. Can be.

In addition, in the glow plug control method capable of temperature compensation according to the present invention, after the (j) step, if the glow plug control device does not coincide with the current supplied to the glow plug during the temperature maintenance period, a diagnostic signal is output. The method may further include generating and transmitting to the electronic control apparatus.

In addition, in the glow plug control method capable of temperature compensation according to the present invention, before the step (f), the glow plug control device measures the actual magnitude of the voltage applied to the glow plug from the power supply unit. (B) setting a time period of the rapid heating section using the measured voltage value, and (c) generating a control signal for controlling the voltage supply during the rapid temperature raising section by using the time of the rapid heating section. And (d) the glow plug control device applying a voltage supplied from the power supply unit to the glow plug according to the control signal.

In addition, after the step (d), the glow plug control device may further include the step (e) of generating a diagnostic signal according to the abnormal state of the glow plug to the electronic control device during the rapid heating section.

In addition, the glow plug control method capable of temperature compensation according to the present invention may further include the step of (l) stopping the application of the voltage to the glow plug when the glow plug control device receives the key off signal from the electronic control device. .

By measuring and controlling the current supplied to the glow plug in real time according to the present invention, by maintaining the optimum temperature required according to the engine conditions, the occurrence of overheating and deterioration of the temperature during the rapid heating section and temperature maintenance section of the glow plug Since it can prevent, an increase in the durability life of a glow plug and premature disconnection can be prevented.

1 is a graph showing the temperature according to the current flowing in the conventional glow plug.
Figure 2 is a block diagram schematically showing the configuration of a glow plug control device for maintaining an appropriate temperature of the present invention.
Figure 3 is a graph showing the relationship between the temperature and the heat resistance according to the characteristics of the glow plug of the present invention.
Figure 4 is a graph showing the temperature according to the current flowing in the glow plug of the present invention.
Figure 5 is a flow diagram illustrating an embodiment of a glow plug control method for maintaining an appropriate temperature of the present invention.

Hereinafter, preferred embodiments of the present invention will be described with reference to the accompanying drawings. In order to more clearly understand the present invention, the same reference numerals are used for the same components in different drawings.

2 is a block diagram schematically showing the configuration of a glow plug control apparatus 100 for maintaining an appropriate temperature of the present invention, Figure 3 is a graph of the relationship between temperature and heat resistance according to the characteristics of the glow plug 400 of the present invention 4 is a diagram showing a temperature according to the current flowing in the glow plug 400 of the present invention, will be described below with reference to FIGS.

The glow plug control apparatus 100 according to the present invention is connected to the electronic control apparatus 200, the power supply unit 300, and the plurality of glow plugs 400, and includes an operation control unit 110, a time setting unit 120, and a duty. The setting unit 130, the current measuring unit 140, the compensation duty calculator 150, the control signal generator 160, the IPS unit 170, and the diagnostic signal generator 180 are included.

The reason for connecting the power supply unit 300 to the glow plug control device 100 is to operate by applying a voltage to the glow plug control device 100 from the moment the key on signal is applied until the key off signal is applied. As a 300, a battery provided in a diesel vehicle may be generally used, and the battery may have an output of 12V.

When a key on signal is input from the electronic control apparatus 200 to the operation controller 110 and the glow plug control apparatus 100 starts to operate, the power measuring unit 310 is applied to the glow plug 400. To measure the actual magnitude of the voltage, if the battery is used, the battery outputs a constant voltage of 12V, so the magnitude of the voltage is constantly measured at 12V. However, when the service life of the battery is increased or the battery is discharged, the magnitude of the measured voltage may be slightly different from the magnitude of the constant voltage.

The time setting unit 120 may set the time of the rapid heating section 21 by using the measured voltage value input from the power measuring unit 310 and output the time to the control signal generating unit 160.

That is, when the power supplied from the power supply unit 300 is measured at 12V by the power measurement unit 310, a time for allowing a constant current to rapidly increase the temperature of the glow plug 400 to a target temperature to be preheated. (Time of rapid warm-up section 21) can be set.

For example, if the target temperature is 1000 ° C. and 500 V rises when 12 V is applied for 1 second, the time of the rapid heating section 21 is 2 seconds.

The duty setting unit 130 uses the pulse width modulation (PWM) signal input from the electronic control apparatus 200 and the pulse width modulation signal to be applied to the temperature maintenance section 22 using the voltage value measured by the power measuring unit 310. Set a duty cycle of the duty cycle and output it to the compensation duty calculator 150.

If the pulse width modulation signal input from the electronic control apparatus 200 is 50% with respect to the applied voltage of 12V, if the voltage value measured by the power measuring unit 310 is 12V, the duty setting unit 130 is a target. The duty cycle of the pulse width modulated signal for maintaining the temperature (in the temperature holding section 22) is set to the same 50% as the pulse width modulated signal input from the electronic control apparatus 200 to compensate the duty cycle calculation unit 150. Can be printed as

However, when the input pulse width modulation signal is 50% with respect to the applied voltage of 12V, if the measured voltage value is less than 12V, the duty setting unit 130 has a constant magnitude of current flowing through the glow plug 400 In order to maintain the target temperature, the duty cycle of the pulse width modulated signal (in the temperature holding section 22) is set to be greater than 50% of the input pulse width modulated signal and outputted to the control signal generator 160. Can be.

On the other hand, when the input pulse width modulation signal is 50% with respect to the applied voltage of 12V, if the measured voltage value is greater than 12V, the duty setting unit 130 has a constant magnitude of current flowing through the glow plug 400 In order to maintain the target temperature, the duty cycle of the pulse width modulated signal (in the temperature holding section 22) is set to be less than 50% of the input pulse width modulated signal and outputted to the control signal generator 160. Can be.

Description of the duty setting unit 130 described above is a description of the case where the pulse width modulation input method is applied when the glow plug control device 100 communicates with the electronic control device 200, and the communication method is a measurement controller communication network ( CAN, Controller Area Network (LIN), or LIN (Local Interconnect Network) method may be applied.

When the measurement controller communication network (CAN) or the lean (LIN) method is applied, the duty setting unit 130 does not receive a pulse width modulation signal (for example, a signal having a duty cycle of 50%) from the electronic control device 200, instead of receiving a pulse. The width modulated signal may be input as data (eg, data to apply the signal at a duty cycle of 50%).

That is, only the communication method between the glow plug control device 100 and the electronic control device 200 is changed.

In addition, when the measurement controller communication network (CAN) or lean (LIN) method is applied, the duty setting unit 130 requests the electronic control device 200 for the performance of the target temperature of the glow plug 400, the electronic control device The current value to be applied to the glow plug 400 may be received from the 200.

In addition, when a pulse width modulation (PWM) input method is applied, only the fact that the diagnosis signal generator 180 simply causes a problem when the problem of the glow plug 400 is detected in the IPS unit 170 to be described below. Although a known diagnostic signal is generated and transmitted to the electronic control apparatus 200, when the measurement controller communication network (CAN) or lean (LIN) method is applied, the type of the problem detected by the IPS unit 170 (for example, disconnection). , A short circuit, an overvoltage, a communication error, etc.) can be transmitted to the electronic control apparatus 200 as data.

The current measuring unit 140 measures a current value flowing through the glow plug 400 using a current sensing module connected to the IPS unit 170, and outputs the measured current value to the compensation duty calculator 150.

The compensation duty calculator 150 uses the duty cycle of the pulse width modulated signal input from the duty setting unit 130 and the measured current value flowing through the glow plug 400 input from the current measuring unit 140. The duty cycle according to the current value to be compensated for during the temperature maintenance section 22 is calculated by comparing the target current and the measured current value which are set to maintain the value, and output to the control signal generator 160.

For example, if the duty cycle of the pulse width modulated signal is 50% with respect to 12V, the measured current value is 6A and the preset target current for maintaining the target temperature (1000 ° C) is 2A, the current flowing through the glow plug 400 4A should be lowered.

That is, since 4A becomes a current value to be compensated, and thus the supply voltage to be reduced becomes 4V, the duty cycle input to the control signal generator 160 is 17% with respect to 12V (at this time, the glow plug 400 The current flowing through) can be 2A).

In this case, the duty cycle may be easily set only by the current flowing through the glow plug 400 and the applied voltage.

Common glow plugs The heating coil, which is a heating unit, and the control coil that controls the heating current are configured in series. When the preheating device is activated, current flows through each glow plug.When the temperature rises, the resistance of the control coil increases to limit the current to increase the glow plug. Protect.

However, referring to FIG. 3, which is a graph showing a relationship between temperature and heat resistance according to the characteristics of the glow plug 400 of the present invention, since the heating plug uses only the heating coil in the glow plug 400, 1000 ° C. There is no change in room temperature and resistance even when heated. That is, since the resistance value does not change in the formula of 'V = IR', when a constant voltage is supplied, a constant current flows to maintain a constant temperature (within 6% of thermal resistance change rate). Can be applied as

The control signal generator 160 may increase the temperature of the glow plug 400 to a target temperature by using the time of the rapid heating section 21 input from the time setting unit 120. While generating a control signal for controlling the current flowing in the glow plug 400 may be output to the IPS unit 170.

For example, if the voltage is measured at 12V in the power measurement unit 310, the time period of the rapid heating section 21 is set to 2 seconds, the duty cycle of the input pulse width modulation signal is set to 50%, the control signal generator 160 ) May output a control signal, which is a pulse width modulation signal generated so that 12V is continuously applied in a 0 to 2 second period, to the IPS unit 170.

In addition, the control signal generator 160 maintains the temperature of the glow plug 400 that rises to the target temperature by using a duty cycle according to the current value to be compensated from the compensation duty calculator 150. The control signal for controlling the current flowing through the glow plug 400 in real time during the maintenance period 22 may be generated and output to the IPS unit 170.

That is, if the duty cycle input from the compensation duty calculator 150 is 17% with respect to 12V, the control signal generator 160 continuously applies 12V in the 0 to 2 second interval, which is the rapid heating period 21. In addition, a control signal having a duty cycle of 17% with respect to 12V may be generated and output to the IPS unit 170.

The IPS unit 170 applies the voltage supplied from the power supply unit 300 to the glow plug 400 according to the control signal input from the control signal generator 160 and checks the state of the glow plug 400.

Intelligent Power Switching Device (IPS) is a load power control device using a semiconductor device (IC) and can be replaced by a fuse and a relay.

IPS basically measures the current flowing through the glow plug 400 in real time using the connected current sensing module, and protects the circuit by blocking the circuit when detecting current shortage or overload due to disconnection, short circuit, or overload. In addition, when disconnection or short circuit occurs in the load power output terminal, a failure may be detected and the failure code may be transmitted to the diagnostic equipment through the electronic control apparatus 200.

In addition, fast switching control is possible, and small and multi-channel control is possible to control many electric loads simultaneously, and it is easy to upgrade when adding a control function.

Due to this feature, the IPS unit 170 may protect not only the voltage applied to the glow plug 400 according to the control signal but also a circuit for applying the voltage, and the diagnostic signal generation unit may detect the state of the glow plug 400. The diagnostic signal generator 180 may generate a diagnostic signal and transmit the diagnostic signal to the electronic control apparatus 200.

That is, the IPS unit 170 measures the current flowing through the glow plug 400 during the rapid heating section 21, and the diagnostic signal generator 180 determines the disconnection, short circuit, etc. of the initial glow plug 400. May be generated and transmitted to the electronic control apparatus 200.

In addition, the IPS unit 170 measures whether the current compensated in real time is correctly flowing in the glow plug 400 during the temperature maintenance section 22, and when the measured current is not correct, the diagnostic signal generator 180 May generate a diagnostic signal entered and determined in the abnormal mode and transmit the generated diagnostic signal to the electronic control apparatus 200.

Here, the state of the glow plug 400, whether the ground (GND) of the glow plug 400 is short-circuited, the current temperature of the glow plug 400, the magnitude of the current and voltage applied to the glow plug 400, It means a state including at least one or more of the error of the pulse width modulation signal.

As described above, the operation control unit 110, the time setting unit 120, the duty setting unit 130, the current measuring unit 140, the compensation duty calculation unit 150, the control signal generator 160, IPS unit Due to the configuration of the 170 and the diagnostic signal generator 180, after the rapid temperature increase section 21 is completed, the current flowing through the glow plug 400 is measured and compared with a current for maintaining a target temperature, thereby compensating the output. In addition, it is possible to reduce the over temperature phenomenon, and to minimize the supply of energy more than necessary to alleviate the temperature corresponding to the over temperature section 24 as shown in FIG. .

In addition, since it can be designed in the form of adding a compensation algorithm to the existing algorithm, there is no need to modify the structure of the conventional glow plug control device.

4 is a graph showing a temperature according to a current flowing in the glow plug 400 according to the present invention. Referring to FIG. 4, the preheating of the glow plug 400 may include a rapid heating section 21 and a temperature maintaining section ( It can be seen that the procedure proceeds to 22).

Comparing the rapid heating section 21 and the temperature holding section 22 of FIG. 4 with the prior art graph of FIG. 1, a high current flows through the glow plug 400 during the time of the rapid heating section 21. ) Rapidly warms up and begins to warm up.

Although the voltage actually input (current supplied) is a constant voltage in the rapid heating section 11 of FIG. 1, the graph shows that the current flowing through the glow plug 400 decreases during the rapid heating section 21, which is a voltage. This is because when the applied current flows, the internal coil temperature of the glow plug 400 increases, and the amount of current flowing due to the thermal resistance decreases.

However, in the embodiment of the present invention, it can be seen that the current flowing through the glow plug 400 is constant by using the low voltage glow plug 400 having no change in thermal resistance according to temperature.

When the glow plug 400 reaches the target temperature, the rapid temperature increase section 21 ends, and when the temperature maintenance section 22 starts, the duty cycle according to the control signal input to the IPS unit 170 (compensated A duty cycle of, for example, 17%) is supplied with a voltage of 12V.

In the prior art of FIG. 1, when the rapid heating section 21 is terminated, an overheat section 13 is generated as shown in the graph, and the time point at which the rapid heating section 11 ends (temperature maintaining section 12 or over temperature) is shown. Since the resistance of the temperature control coil is not sufficiently raised in the starting point of the section 13, the current flowing in the on state becomes larger than the second half of the temperature maintaining section 12.

In this state, when outputting a duty cycle such as the rapid heating section 11, the output power is increased, the heating coil continues to convert high energy into heat, such as energy stored in the glow plug 400, overheating phenomenon (over temperature section 13 )).

However, in the case of the present invention, as shown in Figure 4, it can be seen that the current is kept constant to maintain the target temperature in the temperature holding section 22, without the over-temperature section 13 of the prior art, which is This is because the current loss due to the change in the thermal resistance can be reduced because there is no change in resistance due to the thermal resistance.

That is, in the related art, in order to minimize the overheat period 13 and maintain the target temperature, the control signal generator 160 measures the current value measured by the IPS unit 170 (the current flowing through the glow plug 400 is a reference current. Control signal (a type of reducing the duty cycle in proportion to the measured current value) that lowers the current flowing through the glow plug 400 to the reference current using greater than, that is, supplied to the glow plug 400 after 2 seconds. Generate a pulse width modulated signal with a duty cycle of the pulse width modulated signal for voltage 12V lower than 50%.

On the other hand, in the embodiment of the present invention, in order to maintain the target temperature, the control signal generator 160 compares the current value measured by the IPS unit 170 with the current value for maintaining the target temperature, and thus the two current values. If a difference occurs, generate a control signal that compensates the current value so that the current flowing through the glow plug 400 is equal to the current value for maintaining the target temperature (adjusting the duty cycle according to the difference between the two current values). Format).

5 is a flowchart illustrating an embodiment of a glow plug control method for maintaining an appropriate temperature according to the present invention.

When the operation controller 110 receives a key on signal from the electronic control apparatus 200 (S100), the glow plug control apparatus 100 operates.

First, the power measuring unit 310 measures the actual magnitude of the voltage applied from the power supply unit 300 to the glow plug control device 100, and outputs the measured voltage to the time setting unit 120 and the duty setting unit 130 (S200). ).

The time setting unit 120 sets the time of the rapid heating section 21 by using the measured voltage value input from the power measuring unit 310 and outputs the time to the control signal generating unit 160 (S300).

That is, when the power supplied from the power supply unit 300 is measured at 12V by the power measurement unit 310, a time for allowing a constant current to rapidly increase the temperature of the glow plug 400 to a target temperature to be preheated. (Time of rapid warm-up section 21) can be set.

Next, the control signal generation unit 160 generates a control signal for controlling the current flowing through the glow plug 400 during the rapid heating section 21 by using the input time of the rapid heating section 21, and the IPS unit Output to 170 (S310).

For example, if the voltage is measured at 12V in the power measurement unit 310, the time period of the rapid heating section 21 is set to 2 seconds, the duty cycle of the input pulse width modulation signal is set to 50%, the control signal generator 160 ) May output a control signal, which is a pulse width modulation signal generated so that 12V is continuously applied in a 0 to 2 second period, to the IPS unit 170.

The IPS unit 170 applies the voltage supplied from the power supply unit 300 to the glow plug 400 according to the control signal (S320), and checks the state of the glow plug 400 in real time during the rapid heating section, when a problem occurs. The diagnostic signal may be transmitted to the electronic control apparatus 200.

The above-described step S300 to step S320 represents a step for applying a voltage during the rapid heating section, and the following step S400 to step S440 represents a step for applying a voltage during the temperature holding section.

Next, the duty setting unit 130 uses the pulse width modulation (PWM) signal input from the electronic control apparatus 200 and the voltage value measured by the power measuring unit 310 to be applied to the temperature maintenance section 22. The duty ratio of the width modulated signal is set and output to the compensation duty calculator 150 (S400).

For example, when the pulse width modulation signal input from the electronic control apparatus 200 is 50% with respect to the applied voltage of 12V, if the voltage value measured by the power measuring unit 310 is 12V, the duty setting unit 130 is a target. The duty cycle of the pulse width modulated signal for maintaining the temperature (in the temperature holding section 22) is set to the same 50% as the pulse width modulated signal input from the electronic control apparatus 200 to compensate the duty cycle calculation unit 150. Can be printed as

However, when the input pulse width modulation signal is 50% with respect to the applied voltage of 12V, if the measured voltage value is less than 12V, the duty setting unit 130 has a constant magnitude of current flowing through the glow plug 400 In order to maintain the target temperature, the duty cycle of the pulse width modulated signal (in the temperature holding section 22) is set to be greater than 50% of the input pulse width modulated signal and outputted to the control signal generator 160. Can be.

On the other hand, when the input pulse width modulation signal is 50% with respect to the applied voltage of 12V, if the measured voltage value is greater than 12V, the duty setting unit 130 has a constant magnitude of current flowing through the glow plug 400 In order to maintain the target temperature, the duty cycle of the pulse width modulated signal (in the temperature holding section 22) is set to be less than 50% of the input pulse width modulated signal and outputted to the control signal generator 160. Can be.

The current measuring unit 140 measures a current value flowing through the glow plug 400 using a current sensing module connected to the IPS unit 170, and outputs the measured current value to the compensation duty calculator 150. (S410).

The compensation duty calculator 150 measures the duty cycle of the pulse width modulated signal to be applied to the temperature holding section 22 input from the duty setting unit 130 and flows through the glow plug 400 input from the current measuring unit 140. The current value is used, and the control signal generator 160 calculates a duty cycle according to the current value to be compensated for during the temperature maintenance section 22 by comparing the preset target current to maintain the target temperature with the measured current value. Output as S420.

For example, if the duty cycle of the pulse width modulated signal is 50% with respect to 12V, the measured current value is 6A and the preset target current for maintaining the target temperature (1000 ° C) is 2A, the current flowing through the glow plug 400 4A should be lowered.

That is, since 4A becomes a current value to be compensated, and thus the supply voltage to be reduced becomes 4V, the duty cycle input to the control signal generator 160 is 17% with respect to 12V (at this time, the glow plug 400 The current flowing through) can be 2A).

The control signal generator 160 maintains the temperature of the glow plug 400 that has risen to a target temperature by using a duty cycle according to a current value to be compensated from the compensation duty calculator 150. While generating the control signal for controlling the current flowing in the glow plug 400 in real time (22) and outputs to the IPS unit 170 (S430).

That is, if the duty cycle input from the compensation duty calculator 150 is 17% with respect to 12V, the control signal generator 160 continuously applies 12V in the 0 to 2 second interval, which is the rapid heating period 21. In addition, a control signal having a duty cycle of 17% with respect to 12V may be generated and output to the IPS unit 170.

The IPS unit 170 applies the voltage supplied from the power supply unit 300 to the glow plug 400 according to the control signal (S440), and checks the state of the glow plug 400 in real time during the rapid heating section.

In addition, the diagnostic signal generator 180 receives a status check result of the glow plug 400 from the IPS unit 170, and generates a diagnostic signal when a current compensated in real time does not flow correctly in the glow plug 400. To the electronic control device 200.

Thereafter, the current measuring unit 140 in step S410 described above returns to the step of measuring the current value flowing through the glow plug 400 and outputting the measured current value to the compensation duty calculator 150.

In FIG. 5, when the key off signal is input from the electronic control apparatus 200 after step S440, voltage application is stopped (S500 and S600). However, the key is input from the electronic control apparatus 200 anywhere between steps S100 and S440. When the off signal is input, voltage application can be stopped.

So far I looked at the center of the preferred embodiment for the present invention. It will be understood by those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. Therefore, the disclosed embodiments should be considered in descriptive sense only and not for purposes of limitation. The scope of the present invention is defined by the appended claims rather than by the foregoing description, and all differences within the scope of equivalents thereof should be construed as being included in the present invention.

21 Rapid heating zone
22 Temperature Maintenance Section
100 glow plug control unit
110 Operation Controls
120 hours setting part
130 duty setting section
140 current measuring unit
150 compensation duty calculator
160 control signal generator
170 IPS Department
180 Diagnostic signal generator
200 electronic control unit
300 power supply
310 power measurement unit
400 glow plugs

Claims (16)

A current measuring unit measuring a current value flowing through the glow plug;
A duty setting unit for setting a duty cycle of the pulse width modulated signal by using a pulse width modulated signal received from an electronic controller and a measured voltage value of a voltage applied from a power supply unit;
A compensation duty calculator configured to compare a preset target current with the measured current value and calculate a compensation duty cycle according to the current value to be compensated using the set duty cycle; And
A control signal generator configured to generate a control signal for controlling the voltage supply during the temperature maintenance period by using the compensation duty cycle; Glow plug control device for maintaining an appropriate temperature comprising a. The method of claim 1,
The glow plug,
Glow plug control device for maintaining an appropriate temperature, characterized in that only using a heating coil. The method of claim 1,
The duty setting unit,
And a duty cycle set using pulse width modulated signal data received from the electronic controller instead of the pulse width modulated signal. The method of claim 1,
The duty setting unit,
And a duty cycle set using a current value to be applied to the glow plug, received from the electronic control device, instead of the pulse width modulated signal. The method of claim 1,
An IPS unit which applies a voltage supplied from the power supply unit to the glow plug according to the control signal and checks the state of the glow plug; Glow plug control device capable of temperature compensation further comprising a. 6. The method of claim 5,
Receives a status check result of the glow plug from the IPS unit, and if the current flowing through the glow plug does not match the current supplied during the temperature maintenance period, generates a diagnostic signal and transmits to the electronic control device Generation unit; Glow plug control device capable of temperature compensation further comprising a. 6. The method of claim 5,
A time setting unit configured to set a time for a rapid temperature increase section by using the measured voltage value; Further comprising:
The control signal generator,
And a glow plug control device for generating temperature compensation, wherein the control signal is configured to control a voltage supply during the rapid heating-up period using the time of the rapid heating-up period. 8. The method of claim 7,
The diagnostic signal generator,
During the rapid heating period, the glow plug control device capable of temperature compensation, characterized in that for generating a diagnostic signal according to the abnormal state of the glow plug confirmed by the IPS unit to the electronic control device. (f) the glow plug control device measuring a current value flowing through the glow plug;
(g) setting, by the glow plug control device, a duty cycle of the pulse width modulated signal by using a pulse width modulated signal received from an electronic controller and a measured voltage value of a voltage applied from a power supply unit;
(h) calculating, by the glow plug control device, a compensation duty cycle according to the current value to be compensated by comparing the preset target current with the current value measured in step (f) using the set duty cycle. ; And
(i) generating, by the glow plug control device, a control signal for controlling the voltage supply during the temperature maintenance period using the compensation duty cycle; Glow plug control method for maintaining an appropriate temperature comprising a. The method of claim 9,
In the step (g),
And setting the duty cycle by the glow plug control device using pulse width modulated signal data received from the electronic control device instead of the pulse width modulated signal. The method of claim 9,
In the step (g),
The glow plug control device sets the duty cycle by using a current value to be applied to the glow plug, which is received from the electronic control device, instead of the pulse width modulation signal. Control method. The method of claim 9,
After step (i),
(j) the glow plug control device applying a voltage supplied from the power supply unit to the glow plug according to the control signal; Glow plug control method for maintaining an appropriate temperature, characterized in that it further comprises. 13. The method of claim 12,
After step (j),
(k) generating and transmitting a diagnostic signal to the electronic control device when the glow plug control device does not match the current supplied to the glow plug during the temperature maintenance period; Glow plug control method for maintaining an appropriate temperature, characterized in that it further comprises. The method of claim 9,
Before step (f),
(a) measuring, by the glow plug control device, the actual magnitude of the voltage applied from the power supply to the glow plug;
(b) setting, by the glow plug control device, a time for a rapid heating section using the measured voltage value;
(c) generating, by the glow plug control device, the control signal for controlling a voltage supply during the rapid heating-up period by using the time of the rapid heating-up period; And
(d) the glow plug control device applying a voltage supplied from the power supply unit to the glow plug according to the control signal; Glow plug control method for maintaining an appropriate temperature, characterized in that it further comprises. The method of claim 14,
After the step (d)
(e) generating, by the glow plug control device, a diagnostic signal corresponding to an abnormal state of the glow plug during the rapid temperature increase section and transmitting the generated diagnostic signal to the electronic control device; Glow plug control method for maintaining an appropriate temperature, characterized in that it further comprises. The method of claim 14,
(l) stopping the application of voltage to the glow plug when the glow plug control device receives a key off signal from the electronic control device; Glow plug control method for maintaining an appropriate temperature, characterized in that it further comprises.

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