CN111835323A - Internal drive ignition IGBT overload protection method and device - Google Patents
Internal drive ignition IGBT overload protection method and device Download PDFInfo
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- CN111835323A CN111835323A CN201910310366.1A CN201910310366A CN111835323A CN 111835323 A CN111835323 A CN 111835323A CN 201910310366 A CN201910310366 A CN 201910310366A CN 111835323 A CN111835323 A CN 111835323A
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- 238000004364 calculation method Methods 0.000 claims abstract description 11
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- 230000010354 integration Effects 0.000 abstract description 4
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- 230000001939 inductive effect Effects 0.000 description 2
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- 230000020169 heat generation Effects 0.000 description 1
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K17/00—Electronic switching or gating, i.e. not by contact-making and –breaking
- H03K17/08—Modifications for protecting switching circuit against overcurrent or overvoltage
- H03K17/082—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit
- H03K17/0826—Modifications for protecting switching circuit against overcurrent or overvoltage by feedback from the output to the control circuit in bipolar transistor switches
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Abstract
The invention relates to a gasoline engine ignition system, in particular to an internal drive ignition IGBT overload protection method and device. The method includes obtaining a current integration value, which is a charging time t at a current ignition cycle1The value of time integral calculation is acquired by collecting the current flowing through the IGBT in real time; comparing the current integral value with a preset overload threshold value in real time, and adjusting the next ignition cycle charging time t when the current integral value is greater than the overload threshold value, wherein t is less than t1. According to the invention, the overload information of the IGBT can be accurately acquired by collecting and analyzing the current flowing through the IGBT, and the ignition cycle charging time of the ignition coil is limited by further utilizing the overload information of the IGBT, so that the continuous overload phenomenon of the IGBT is effectively solved.
Description
Technical Field
The invention relates to a gasoline engine ignition system, in particular to an internal drive ignition IGBT overload protection method and device.
Background
Spark ignition is the primary form of ignition for gasoline engines. Among them, the inductive ignition system is widely used due to its high cost performance.
The basic inductive ignition system typically includes an ignition coil, a power switch, a drive circuit, a spark plug, and an ECU (electronic control unit). The internal-drive ignition IGBT (insulated gate bipolar transistor) is an IGBT integrated in the ECU, and is used to drive an ignition coil connected to the ECU through a wire harness, so as to realize ignition control of the gasoline engine, and during the operation of the gasoline engine, a plurality of ignition cycles are involved. And the ignition coil is charged through the control of the ECU until the electrode of the spark plug breaks down to generate electric sparks, which is a one-time ignition cycle. Referring to fig. 1, fig. 1 is a schematic diagram of the operation of a typical internal drive ignition IGBT, where the internal drive ignition IGBT is integrated in an automobile ECU, a driving signal is input to the internal drive ignition IGBT through an IGBT driving module, and then an ignition coil charges under the control of the internal drive ignition IGBT, so as to finally realize ignition of a spark plug.
In practical application, the overload phenomenon of the internal drive ignition IGBT is often caused due to the factors that the load changes along with the advance of time, the load is short-circuited, the pins between chips in an automobile environment are possibly short-circuited, the ignition charging time is too long and the like. And the continuous overload phenomenon of the internal drive ignition IGBT is very easy to damage the internal drive ignition IGBT, so that the ignition coil fails, and even the ECU of the automobile is damaged.
At present, no method for preventing the internal drive ignition IGBT from generating continuous overload phenomenon exists.
Disclosure of Invention
The invention aims to provide an internal drive ignition IGBT overload protection method and device, and aims to solve the problem that continuous overload is easy to occur in the existing internal drive ignition IGBT.
In order to solve the technical problem, the invention provides an internal drive ignition IGBT overload protection method, which comprises the following steps:
obtaining a current integral value, which is a charging time t in a current ignition cycle1The value of time integral calculation is acquired by collecting the current flowing through the IGBT in real time;
comparing the current integral value with a preset overload threshold value in real time, and determining the current integral valueWhen the score value is larger than the overload threshold value, adjusting the next ignition cycle charging time t, and enabling t to be smaller than t1。
Further, when the current integration value is greater than the overload threshold value, the corresponding ignition charge time is recorded as tactAnd calculating the next ignition cycle charging time t according to the following formula:
t＝(t1-tact)/n+tact；
wherein,
n is a preset overload time threshold value, and n is more than 1.
Further, the method further comprises:
acquiring an overload number value which is the sum of the number of ignition cycles of which the integral value is larger than the overload threshold value;
comparing the overload number value to the overload number threshold;
and when the overload number value is larger than the overload number threshold value, forming a fault signal of the ignition loop, and transmitting the fault signal to a fault display system of the automobile.
Further, if the current integral value at the current moment is smaller than or equal to the overload threshold, continuing to acquire the current integral value at the next moment;
if the current integral value at the current moment is larger than the overload threshold value, stopping acquiring the current ignition cycle charging time t1The current integral value at the subsequent time.
Further, if all the acquired current integral values are less than or equal to the overload threshold value within the current ignition cycle charging time, the next ignition cycle charging time is the same as the current ignition cycle charging time.
In order to solve the above problem, the present invention further provides an overload protection device for an internal drive ignition IGBT, the device including:
the data acquisition unit is used for acquiring the current flowing through the IGBT to obtain a sampling current;
the calculating unit is used for carrying out integral calculation on the current with respect to time to obtain a current integral value;
the comparison unit is used for comparing the current integral value with a preset overload threshold value to obtain a comparison result;
and the calculating unit is also used for calculating the next ignition cycle charging time t according to the comparison result.
Further, the device also comprises an overload frequency counting unit which is used for counting an overload frequency value according to the comparison result, wherein the overload frequency value is the sum of the number of the ignition cycles of which the integral value is larger than the overload threshold value;
the comparison unit is also used for comparing the overload number value with a preset overload number threshold, and when the overload number value is larger than the overload number threshold, an ignition loop fault signal is formed and transmitted to a fault display system of the automobile.
Further, the data acquisition unit is connected with a sampling resistor, and the sampling resistor is connected in series in a current channel of the IGBT;
the data acquisition unit acquires current flowing through the IGBT by acquiring current on the sampling resistor, so as to obtain sampling current.
Furthermore, one end of the collecting resistor is connected to the common end of the IGBT emitter, and the other end of the collecting resistor is grounded.
Further, the data acquisition unit, the calculation unit, the comparison unit and the overload frequency counting unit are all realized by an MCU in an automobile ECU.
Compared with the prior art, the invention has the advantages that:
through collection and analysis to the electric current that flows through the IGBT, the overload information of acquireing the IGBT that can be accurate to further utilize the overload information of IGBT, inject ignition coil's ignition cycle charge time, solved IGBT's continuous overload phenomenon effectively, reduced the risk that the IGBT damages because of continuous overload, and can also reduce the customer and lose efficacy because of igniting and to the complaint of ECU manufacturer, with reduction enterprise manufacturing cost.
Drawings
FIG. 1 is a schematic diagram of the operation of a typical internal drive ignition IGBT;
fig. 2 is an equivalent schematic diagram of an IGBT overload;
fig. 3 is a flowchart of an internal combustion ignition IGBT overload protection method according to an embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a variation of a current curve flowing through an IGBT according to an embodiment of the present invention;
fig. 5 is a schematic diagram of an overload protection device for an internal drive ignition IGBT according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a connection structure of a sampling resistor in an ECU of an automobile according to an embodiment of the present invention.
Detailed Description
As can be seen from the foregoing, the continuous overload phenomenon of the internal-drive ignition IGBT is very likely to damage the internal components of the IGBT. The overload phenomenon of the IGBT can be classified into an overload phenomenon in which the IGBT is turned on and then turned on after the load is in an overload state. As shown in fig. 2, the equivalent diagram of the IGBT overload is shown, and the resulting effect is that the current after the IGBT is turned on is larger than the rated current value. While the overload of the internal drive ignition IGBT can be defined as: current I flowing through IGBTCExceeding the rated current value.
During normal charging, the later the moment of overload, the less the thermal stress on the IGBT current. After the overload occurs, the rate of rise of the current is increased. Since the maximum current is related to the degree of overload and the conduction time after overload, the greater the degree of overload, the longer the corresponding conduction time, the greater the maximum current. When the degree of overload is large, the current may overshoot and then fall back to a stable value, and the power of the IGBT increases and the heat generation amount increases, so that the devices in the system are easily damaged. Therefore, the ignition cycle charging time is continuously subjected to parameterized adjustment, so that the current value of the internal-drive ignition IGBT flowing through is always in a small state, and the phenomenon of continuous overload of the IGBT can be effectively avoided.
The internal drive ignition IGBT overload protection method proposed by the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments. The advantages and features of the present invention will become more fully apparent from the appended claims and the following description. It is to be noted that the drawings are in a very simplified form and are not to precise scale, which is merely for the purpose of facilitating and distinctly claiming the embodiments of the present invention.
Referring to fig. 3, fig. 3 is a flowchart of the overload protection method for the internal combustion ignition IGBT provided in this embodiment. The embodiment provides an internal-drive ignition IGBT overload protection method which can be applied to a three-cylinder gasoline engine or a four-cylinder gasoline engine. The method comprises the following steps:
obtaining a current integral value, which is a charging time t in a current ignition cycle1And the value obtained by integrating the time through collecting the current flowing through the IGBT in real time is used for reflecting the overload degree of the IGBT.
Comparing the current integral value with a preset overload threshold value in real time, judging that the IGBT is overloaded when the current integral value is larger than the overload threshold value, and adjusting the next ignition cycle charging time t to make t smaller than t1。
In order to enable the next ignition cycle charging time t to be more accurate and reduce the overload duration of the IGBT to a greater extent, the next ignition cycle charging time t may also be calculated by the following formula (1):
t＝(t1-tact)/n+tact；
wherein,
n is a preset overload frequency threshold value, and n is more than 1;
tactis the corresponding ignition charging time when the current integral value is larger than the overload threshold value.
The overload duration of the IGBT can be greatly reduced through the method, however, if the IGBT is subjected to transient overload for many times, damage to the drive ignition IGBT still can be caused. Therefore, the IGBT can be further protected by obtaining the overload number value and comparing the overload number value with the overload number threshold. Wherein the overload times value is the sum of the number of ignition cycles for which the current integration value is greater than the overload threshold value.
It should be noted that, during each ignition cycle charging time, whether the current integral value is greater than the overload threshold value once or more than once, an overload is recorded, and the overload count value is incremented once. With continued operation of a gasoline engine, multiple ignition cycles may accompany. Therefore, the overload times value will also vary according to the overload condition of the IGBT during the charging time of each ignition cycle. And comparing the overload number value with the overload number threshold value in real time along with the ignition cycle, and if the overload number value is greater than the overload number threshold value, forming an ignition loop fault signal to prompt that the ignition loop has a fault so as to carry out automobile preset fault processing program processing or manual intervention as soon as possible.
To more clearly illustrate the way in which the next firing cycle charging time is calculated, the value of the next firing cycle charging time t is obtained by setting a specific time value and an overload number threshold. For example, the overload number threshold is 5, the current ignition cycle charging time is 3ms, and when the current integrated value is greater than the overload threshold in the current ignition cycle charging time, the corresponding ignition charging time is 2 ms. By substituting equation (1): t ═ t (t)1-tact)/n+tactThe next ignition cycle charging time t can be found to be 2.2 ms.
As shown in fig. 4, the current flowing through the IGBT shows a curve change with the passage of time. Therefore, the current flowing through the IGBT needs to be continuously collected and integrated in real time. And comparing the overload threshold value with the preset overload threshold value in real time. As will be readily understood by those skilled in the art, the higher the frequency of the sampling current, the earlier the overload detection time can be, and therefore, the control accuracy of the method can be adjusted by appropriately adjusting the sampling frequency.
As can be seen from the current variation curve through the IGBT in fig. 4, if the current integral value at the present time exceeds the overload threshold value, the current integral value at the subsequent time also exceeds the overload threshold value. In order to reduce the number of times of collecting current, unnecessary calculation amount is reduced. Therefore, the present embodiment can also decide whether to continuously collect and calculate the current flowing through the IGBT according to the actual determination situation. That is, if the current integral value at the current moment is less than or equal to the overload threshold, the current integral value at the next moment needs to be continuously obtained, so as to ensure that whether the overload phenomenon occurs within a complete ignition cycle charging time can be accurately judged. And if the current integral value at the current moment is larger than the overload threshold, stopping acquiring the current integral value at the subsequent moment in the current ignition cycle charging time.
In general, when the integral value of the current flowing through the IGBT with respect to time does not exceed the overload threshold, the IGBT may be considered to have a low risk of damage. Therefore, if all the acquired current integral values are less than or equal to the overload threshold value within the current ignition cycle charging time, the next ignition cycle charging time is the same as the current ignition cycle charging time.
Referring to fig. 5, fig. 5 is a schematic diagram of an overload protection device for an internal drive ignition IGBT provided in this embodiment, and the present embodiment further provides an overload protection device for an internal drive ignition IGBT, including:
the data acquisition unit 11 is used for acquiring current flowing through the IGBT to obtain sampling current;
a calculating unit 12, configured to perform time-integration calculation on the current to obtain a current integration value;
the comparison unit 13 is used for comparing the current integral value with a preset overload threshold value to obtain a comparison result;
the calculation unit 12 is further configured to calculate the next ignition cycle charging time t according to the comparison result, for example, according to the calculation manner provided by the overload protection method described above. Namely, when overload occurs, calculating to obtain the next ignition cycle charging time t by adopting a formula (1); when overload does not occur, the charging time t of the next ignition cycle can be made to be t ═ t1。
Further, the device comprises an overload frequency counting unit 14 for counting an overload frequency value according to the comparison result, wherein the overload frequency value is the sum of the number of the ignition cycles of which the integral value is larger than the overload threshold value;
the comparison unit 13 is further configured to compare the overload number value with a preset overload number threshold, and when the overload number value is greater than the overload number threshold, form an ignition circuit fault signal, and transmit the fault signal to a fault display system of the vehicle.
Further, the data obtaining unit 11 is connected to a sampling resistor (shoot) 1a, and the sampling resistor 1a is connected in series in a current channel of the IGBT;
the data obtaining unit 11 obtains the current flowing through the IGBT by collecting the current on the sampling resistor 1a, so as to obtain a sampling current.
Furthermore, one end of the collecting resistor 1a is connected to the common end of the emitter of the IGBT, and the other end is grounded.
As shown in fig. 6, fig. 6 is a schematic diagram of a connection structure of the sampling resistor in the ECU of the vehicle according to the present embodiment. The IGBT contains 4 emitters for controlling the ignition coil. When the 4 emitters are all connected to the sampling resistor 1a, it is equivalent that the sampling resistor 1a is connected to one common terminal of the 4 emitters.
Further, the data obtaining unit 11, the calculating unit 12, the comparing unit 13, and the overload frequency counting unit 14 are all implemented by an MCU (micro control unit) unit in the vehicle ECU, as shown in fig. 6, and the sampling resistor 1a is connected to the MCU unit in the vehicle ECU.
In summary, in the present embodiment, the current flowing through the IGBT is collected and analyzed, the overload information of the IGBT can be accurately obtained, and the overload information of the IGBT is further utilized to limit the ignition cycle charging time of the ignition coil, thereby effectively solving the continuous overload phenomenon of the IGBT, reducing the risk of damage of the IGBT due to continuous overload, and reducing complaints of customers to ECU manufacturers due to ignition failure, so as to reduce the production cost of enterprises.
The above description is only for the purpose of describing the preferred embodiments of the present invention, and is not intended to limit the scope of the present invention, and any variations and modifications made by those skilled in the art based on the above disclosure are within the scope of the appended claims.
Claims (10)
1. An internal drive ignition IGBT overload protection method is characterized by comprising the following steps:
obtaining a current integral value, which is a charging time t in a current ignition cycle1The value of time integral calculation is acquired by collecting the current flowing through the IGBT in real time;
comparing the current integral value with a preset overload threshold value in real time, and adjusting the next ignition cycle charging time t when the current integral value is greater than the overload threshold value, wherein t is less than t1。
2. The internal drive ignition IGBT overload protection method of claim 1,
when the current integral value is greater than the overload threshold value, recording the corresponding ignition charge time as tactAnd calculating the next ignition cycle charging time t according to the following formula:
t＝(t1-tact)/n+tact；
wherein,
n is a preset overload time threshold value, and n is more than 1.
3. The internal drive ignition IGBT overload protection method of claim 1, further comprising:
acquiring an overload number value which is the sum of the number of ignition cycles of which the integral value is larger than the overload threshold value;
comparing the overload number value to the overload number threshold;
and when the overload number value is larger than the overload number threshold value, forming a fault signal of the ignition loop, and transmitting the fault signal to a fault display system of the automobile.
4. The internal drive ignition IGBT overload protection method of claim 1,
if the current integral value at the current moment is smaller than or equal to the overload threshold, continuing to acquire the current integral value at the next moment;
if the current integral value at the current moment is larger than the overload threshold value, stopping acquiring the current ignition cycle charging time t1The current integral value at the subsequent time.
5. The internal drive ignition IGBT overload protection method of claim 4,
and if all the acquired current integral values are less than or equal to the overload threshold value in the current ignition cycle charging time, the next ignition cycle charging time is the same as the current ignition cycle charging time.
6. An overload protection device for an internal drive ignition IGBT, comprising:
the data acquisition unit is used for acquiring the current flowing through the IGBT to obtain a sampling current;
the calculating unit is used for carrying out integral calculation on the current with respect to time to obtain a current integral value;
the comparison unit is used for comparing the current integral value with a preset overload threshold value to obtain a comparison result;
and the calculating unit is also used for calculating the next ignition cycle charging time t according to the comparison result.
7. The overload protection device for the internal-drive ignition IGBT according to claim 6, further comprising an overload number counting unit for counting an overload number value according to the comparison result, wherein the overload number value is the sum of the number of ignition cycles of which the integral value is larger than the overload threshold value currently appears;
the comparison unit is also used for comparing the overload number value with a preset overload number threshold, and when the overload number value is larger than the overload number threshold, an ignition loop fault signal is formed and transmitted to a fault display system of the automobile.
8. The overload protection device for the internal drive ignition IGBT as claimed in claim 6, wherein a sampling resistor is connected with the data acquisition unit, and the sampling resistor is connected in series in a current channel of the IGBT;
the data acquisition unit acquires current flowing through the IGBT by acquiring current on the sampling resistor, so as to obtain sampling current.
9. The overload protection device for an internal drive ignition IGBT as claimed in claim 8, wherein one end of the collection resistor is connected to the common end of the IGBT emitter, and the other end is grounded.
10. The overload protection device for the internal combustion ignition IGBT according to claim 7, wherein the data acquisition unit, the calculation unit, the comparison unit and the overload number counting unit are all realized by an MCU unit in an automobile ECU.
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| CN201910310366.1A CN111835323A (en) | 2019-04-17 | 2019-04-17 | Internal drive ignition IGBT overload protection method and device |
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| CN201910310366.1A CN111835323A (en) | 2019-04-17 | 2019-04-17 | Internal drive ignition IGBT overload protection method and device |
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2019
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Application publication date: 20201027 |