CN111614305A - Overheat protection method of EPS system - Google Patents
Overheat protection method of EPS system Download PDFInfo
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- CN111614305A CN111614305A CN202010551080.5A CN202010551080A CN111614305A CN 111614305 A CN111614305 A CN 111614305A CN 202010551080 A CN202010551080 A CN 202010551080A CN 111614305 A CN111614305 A CN 111614305A
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- current
- overheat protection
- eps system
- protection current
- component
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P29/00—Arrangements for regulating or controlling electric motors, appropriate for both AC and DC motors
- H02P29/60—Controlling or determining the temperature of the motor or of the drive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B62—LAND VEHICLES FOR TRAVELLING OTHERWISE THAN ON RAILS
- B62D—MOTOR VEHICLES; TRAILERS
- B62D5/00—Power-assisted or power-driven steering
- B62D5/04—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear
- B62D5/0457—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such
- B62D5/0481—Power-assisted or power-driven steering electrical, e.g. using an electric servo-motor connected to, or forming part of, the steering gear characterised by control features of the drive means as such monitoring the steering system, e.g. failures
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Power Steering Mechanism (AREA)
Abstract
The invention provides an overheat protection method of an EPS system, which comprises the following steps: step 1: recording a part bearing large current in the EPS system part as a first part, and recording a part bearing small current in the EPS system part as a second part; step 2: respectively estimating the overheating protection current of the first class of components and the overheating protection current of the second class of components in real time, and respectively recording the overheating protection current as I1And I2(ii) a And step 3: the overheating protection current I1And an overheat protection current I2The minimum value of the EPS system is used as the overheat protection current of the EPS system; wherein when the current I is overheat protection1And an overheat protection current I2When equal, the overheat protection current I1And an overheat protection current I2Can be used as the overheat protection current of the EPS system. The minimum overheat protection current of various parts is met by classifying various parts of the EPS system according to the magnitude of the borne current and estimating the overheat protection current of various parts, so that the realizationAnd the accuracy of system overheat estimation and overheat protection is improved for overheat protection of all parts of the EPS system.
Description
Technical Field
The invention relates to the automobile power steering technology, in particular to an overheat protection method of an EPS system.
Background
Because the EPS motor is a short-time working system, the motor can be damaged within short-time working (2-3 min) under the condition that the system has no thermal protection and large current. Under the normal condition, a mode of combining motor thermal protection and ECU thermal protection is adopted to protect a motor and a controller, wherein the temperature rise of the ECU is obtained through a thermistor on a power board, the motor thermal protection is obtained through calculating the heating value through current, but the condition that the motor or the ECU is burnt due to slow thermal protection is often caused by inaccurate system thermal estimation, or the condition that the discomfort of a driver is caused due to the increase of hand strength caused by too fast thermal protection intervention is often caused.
Disclosure of Invention
Aiming at the problems in the prior art, the invention provides an overheat protection method of an EPS system, which is used for calculating the power consumption and heat dissipation generated by a component according to the parameters of the specific heat capacity, the heat conductivity and the like of the component, further calculating the temperature rise of the component, and further accurately estimating the temperature of the EPS system component.
An overheat protection method of an EPS system comprises the following steps:
step 1: recording a part bearing large current in the EPS system part as a first part, and recording a part bearing small current in the EPS system part as a second part;
step 2: respectively estimating the overheating protection current of the first class of components and the overheating protection current of the second class of components in real time, and respectively recording the overheating protection current as I1And I2；
And step 3: the overheating protection current I1And an overheat protection current I2The minimum value of the EPS system is used as the overheat protection current of the EPS system; wherein when the current I is overheat protection1And an overheat protection current I2When equal, the overheat protection current I1And an overheat protection current I2Can be used as the overheat protection current of the EPS system.
Further comprises the following steps: the step of estimating the overheat protection current in the step 2 is as follows:
step 2.1: calculating the heating power P1＝I2*R1；
Step 2.2: calculating the heat dissipation power P2＝T1/R2；
Step 2.3: calculating the heat estimated temperature rise Δ T ═ P1-P2)/C；
Step 2.4: calculating the temperature rise rate T of the cycle2＝T1+ΔT；
Step 2.5: calculating the thermally estimated temperature T ═ Td+T2；
Step 2.6: the overheat protection current I is obtained by looking up the following table 1 according to the thermal estimation temperature by using an interpolation method1And an overheat protection current I2；
TABLE 1 Linear relationship of thermal estimation temperature and overheat protection current
| Heat estimated temperature value (. degree. C.) | Current (A) |
| 100 | 65 |
| 150 | 65 |
| 170 | 20 |
| 200 | 0 |
Wherein: r1Estimating the total resistance to heat of a first type of component or a second type of component for an EPS system component, I being the current flowing through the total resistance to heat, T1For the temperature rise value of the last cycle and the preset value is zero, R2Estimating the thermal resistance of a first type of component or a second type of component in an EPS system component, C being EPSEstimating the heat capacity value of the first type of component or the second type of component in the system component; t isdThe temperature of the driving stage of the controller is measured in real time by a thermistor on the controller.
The invention has the beneficial effects that: the minimum overheat protection current of each component is met by classifying each component of the EPS system according to the magnitude of the borne current and estimating the overheat protection current of each component, so that the overheat protection of each component of the EPS system is realized, and the accuracy of the overheat estimation and the overheat protection of the system is improved; the method for estimating the overheat protection current converts the heat generation power and the heat dissipation power into the intermediate calorimetric estimated temperature, and obtains the overheat protection current by looking up the table of the intermediate calorimetric estimated temperature, and is simple and effective.
Drawings
FIG. 1 is a block flow diagram of the present invention;
FIG. 2 is a block diagram of the system of the present invention;
FIG. 3 is a schematic diagram illustrating the effect of the overheat protection current processing according to the present invention.
Detailed Description
The present invention will be described in detail with reference to the accompanying drawings. Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are illustrative only and should not be construed as limiting the invention.
An overheat protection method of an EPS system, as shown in fig. 1, includes the following steps:
step 1: recording a part bearing large current in the EPS system part as a first part, and recording a part bearing small current in the EPS system part as a second part;
step 2: respectively estimating the overheating protection current of the first class of components and the overheating protection current of the second class of components in real time, and respectively recording the overheating protection current as I1And I2；
And step 3: the overheating protection current I1And overheat protectionStream I2The minimum value of the EPS system is used as the overheat protection current of the EPS system; wherein when the current I is overheat protection1And an overheat protection current I2When equal, the overheat protection current I1And an overheat protection current I2Can be used as the overheat protection current of the EPS system.
Referring to fig. 2, the step of estimating the overheat protection current in step 2 is:
step 2.1: calculating the heating power P1＝I2*R1；
Step 2.2: calculating the heat dissipation power P2＝T1/R2；
Step 2.3: calculating the heat estimated temperature rise Δ T ═ P1-P2)/C；
Step 2.4: calculating the temperature rise rate T of the cycle2＝T1+ΔT；
Step 2.5: calculating the thermally estimated temperature T ═ Td+T2；
Step 2.6: the overheat protection current I is obtained by looking up the following table 1 according to the thermal estimation temperature by using an interpolation method1And an overheat protection current I2；
TABLE 1 Linear relationship of thermal estimation temperature and overheat protection current
| Heat estimated temperature value (. degree. C.) | Current (A) |
| 100 | 65 |
| 150 | 65 |
| 170 | 20 |
| 200 | 0 |
Wherein: r1Estimating the total resistance to heat of a first type of component or a second type of component for an EPS system component, I being the current flowing through the total resistance to heat, T1For the temperature rise value of the last cycle and the preset value is zero, R2Estimating the thermal resistance of the first type of component or the second type of component in the EPS system component, and C estimating the heat capacity value of the first type of component or the second type of component in the EPS system component; t isdThe temperature of the driving stage of the controller is measured in real time by a thermistor on the controller.
Referring to fig. 3, in this example, the thermal equilibrium point current of the first type of component is set to be 36A, and the temperature is set to be 162 ℃; the heat treatment of the second type of part was set at a thermal equilibrium point current of 18A and a temperature of 173 ℃. Namely, the heat treatment of the first type of component and the heat treatment of the second type of component reach the heat balance at 162 ℃ and 173 ℃, the heating power and the heat dissipation power are the same, and the current is respectively maintained at 36A and 18A. The specific estimation model parameter selection range is shown in the attached table 2.
In this example, the parameters of the estimated models of the heat treatment of the first type of component and the heat treatment of the second type of component are selected as follows:
| treatment method | Heating resistor (m omega) | Thermal resistance (DEG C/W) | Heat capacity (J/. degree. C.) |
| Component of the first kind | 16 | 4.6 | 1.9 |
| Parts of the second kind | 3 | 145 | 5.2 |
Wherein, the heating resistance, the thermal resistance and the heat capacity of the first type of component and the second type of component can be calculated and experimentally estimated, and the parameters of the heating resistance, the thermal resistance, the heat capacity and the like of the components of different EPS systems have differences and need to be independently confirmed; the method for obtaining the heating resistance, the thermal resistance and the thermal capacity of each part is a conventional technology and is not a main invention point in the scheme of the invention, and the method is not repeated.
Aiming at the overheating protection treatment effect of two types of components in an EPS system, the environment temperature is 30 ℃, the test working condition of given motor current 65A locked rotor is taken as an example, and the driving stage temperature TdFast thermal estimation of temperature TfSlow thermal estimation of temperature TsAnd a thermal protection current IpThe test results are shown in table 3 below:
| test time(s) | Td(℃) | Tf(℃) | Ts(℃) | Ip(A) |
| 0 | 30 | 30 | 30 | 65 |
| 8 | 36 | 140 | 63 | 65 |
| 26 | 38 | 161 | 68 | 40 |
| 160 | 84 | 162 | 121 | 36 |
| 276 | 57 | 162 | 162 | 36 |
| 354 | 57 | 101 | 170 | 20 |
| 472 | 58 | 83 | 173 | 18 |
| 548 | 58 | 82 | 173 | 18 |
According to experimental data, the estimated temperature of the first-class component basically enters a thermal equilibrium state after 160s, and the overheat protection current of the first-class component is stabilized to about 36A; 276s, the second type component estimated temperature substantially corresponds to the first type component estimated temperature; then the overheating protection current of the second type of component acts, the overheating protection current is reduced to 18A after 354s, the corresponding overheating estimated temperature of the second type of component is 173 ℃ at the moment, the temperature is consistent with that in the table 3, then the overheating estimated temperature of the second type of component is higher and higher along with the increase of time, and the overheating protection current is reduced along with the overheating estimated temperature according to the table 3, so that the function of protecting the EPS system component is achieved.
The working principle of the invention is as follows: calculating power consumption and heat dissipation generated by the components according to parameters such as heat capacity, heat resistance and resistance of various components in the EPS system, and further calculating temperature rise of the components; meanwhile, each part of the EPS system is mainly divided into two types according to the heating condition of each part: the parts bearing large current comprise a motor coil winding, a motor driving port and the like; conventional devices, i.e., components subject to small currents, include power supply filter capacitors, filter inductors, bus relays, and the like. And the overheating protection treatment is realized by an overheating protection current estimation model and by combining the selection of different parameters of each part.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (2)
1. An overheat protection method of an EPS system is characterized by comprising the following steps:
step 1: recording a part bearing large current in the EPS system part as a first part, and recording a part bearing small current in the EPS system part as a second part;
step 2: respectively estimating the overheating protection current of the first class of components and the overheating protection current of the second class of components in real time, and respectively recording the overheating protection current as I1And I2；
And step 3: the overheating protection current I1And an overheat protection current I2The minimum value of the EPS system is used as the overheat protection current of the EPS system; wherein when the current I is overheat protection1And an overheat protection current I2When equal, the overheat protection current I1And an overheat protection current I2Can be used as the overheat protection current of the EPS system.
2. The method of claim 1, wherein the method comprises the steps of: the step of estimating the overheat protection current in the step 2 is as follows:
step 2.1: calculating the heating power P1＝I2*R1；
Step 2.2: calculating the heat dissipation power P2＝T1/R2；
Step 2.3: calculating the heat estimated temperature rise Δ T ═ P1-P2)/C；
Step 2.4: calculating the temperature rise rate T of the cycle2＝T1+ΔT；
Step 2.5: calculating the thermally estimated temperature T ═ Td+T2；
Step 2.6: using interpolation based on thermally estimated temperaturesTABLE 1 obtaining the overheat protection Current I1And an overheat protection current I2；
TABLE 1 Linear relationship of thermal estimation temperature and overheat protection current
Wherein: r1Estimating the total resistance to heat of a first type of component or a second type of component for an EPS system component, I being the current flowing through the total resistance to heat, T1For the temperature rise value of the last cycle and the preset value is zero, R2Estimating the thermal resistance of the first type of component or the second type of component in the EPS system component, and C estimating the heat capacity value of the first type of component or the second type of component in the EPS system component; t isdThe temperature of the driving stage of the controller is measured in real time by a thermistor on the controller.
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| CN202010551080.5A CN111614305A (en) | 2020-06-17 | 2020-06-17 | Overheat protection method of EPS system |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113765465A (en) * | 2021-07-27 | 2021-12-07 | 岚图汽车科技有限公司 | Steering motor thermal protection control method and device |
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| JPH11289790A (en) * | 1998-04-03 | 1999-10-19 | Lumitter Ind Corp Ltd | Overheat protector for motor |
| CN105584519A (en) * | 2014-11-12 | 2016-05-18 | 上海航天汽车机电股份有限公司 | Heat management method and system for electric power steering system |
| CN106998170A (en) * | 2016-08-31 | 2017-08-01 | 南京奥联汽车电子技术有限公司 | Direct current generator method for excessive heating protection and implementation step based on feedback current |
| CN108248679A (en) * | 2018-01-16 | 2018-07-06 | 北京汽车股份有限公司 | The control method for over-heating protection of vehicle and its electric boosting steering system, device |
| US20180254734A1 (en) * | 2017-03-06 | 2018-09-06 | Denso Corporation | Rotary electric machine controller and electric power steering device using the same |
| CN109412500A (en) * | 2018-11-15 | 2019-03-01 | 厦门嘉裕德汽车电子科技有限公司 | A kind of method for building up of EPS motor method for excessive heating protection and Correlation model |
| CN109600096A (en) * | 2019-01-02 | 2019-04-09 | 常州朗奇威电器有限公司 | Motor heat management system and working method, motor |
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2020
- 2020-06-17 CN CN202010551080.5A patent/CN111614305A/en active Pending
Patent Citations (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH11289790A (en) * | 1998-04-03 | 1999-10-19 | Lumitter Ind Corp Ltd | Overheat protector for motor |
| CN105584519A (en) * | 2014-11-12 | 2016-05-18 | 上海航天汽车机电股份有限公司 | Heat management method and system for electric power steering system |
| CN106998170A (en) * | 2016-08-31 | 2017-08-01 | 南京奥联汽车电子技术有限公司 | Direct current generator method for excessive heating protection and implementation step based on feedback current |
| US20180254734A1 (en) * | 2017-03-06 | 2018-09-06 | Denso Corporation | Rotary electric machine controller and electric power steering device using the same |
| CN108248679A (en) * | 2018-01-16 | 2018-07-06 | 北京汽车股份有限公司 | The control method for over-heating protection of vehicle and its electric boosting steering system, device |
| CN109412500A (en) * | 2018-11-15 | 2019-03-01 | 厦门嘉裕德汽车电子科技有限公司 | A kind of method for building up of EPS motor method for excessive heating protection and Correlation model |
| CN109600096A (en) * | 2019-01-02 | 2019-04-09 | 常州朗奇威电器有限公司 | Motor heat management system and working method, motor |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113765465A (en) * | 2021-07-27 | 2021-12-07 | 岚图汽车科技有限公司 | Steering motor thermal protection control method and device |
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