CN112406547A - Safety protection control system for electric automobile electric heater - Google Patents
Safety protection control system for electric automobile electric heater Download PDFInfo
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- CN112406547A CN112406547A CN202011382541.7A CN202011382541A CN112406547A CN 112406547 A CN112406547 A CN 112406547A CN 202011382541 A CN202011382541 A CN 202011382541A CN 112406547 A CN112406547 A CN 112406547A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
Abstract
The invention discloses a safety protection control system for an electric automobile electric heater, and relates to the technical field of electric automobile safety control. The temperature control device comprises a first temperature acquisition unit, a second temperature acquisition unit, an MCU, a voltage acquisition unit, a voltage control execution module, an electric heater control driving unit, a current sampling unit, a temperature switch execution module, an MCU crash prevention protection unit, a current overcurrent comparison unit, a signal comprehensive processing unit and a protection signal output unit; the first temperature acquisition unit is used for acquiring the working temperature information of the electric heater and transmitting the working temperature information to the MCU; the second temperature acquisition unit is used for acquiring circuit board temperature information of the electric heater drive control circuit board; the invention can effectively ensure the reliable operation of the electric heater, timely and effectively close the electric heater control drive unit and cut off the power supply of the electric heater when a fault occurs, and timely and effectively protect the life safety of drivers and passengers and the safety of vehicles.
Description
Technical Field
The invention belongs to the technical field of safety control of electric automobiles, and particularly relates to a safety protection control system for an electric heater of an electric automobile.
Background
In winter, the endurance of the new energy electric automobile generally shrinks greatly, mainly because the viscosity of the electrolyte of the battery pack rises and the charge and discharge performance of the battery pack is reduced at low temperature. The new energy electric automobile can be preheated by installing the automobile parking heater to enable the battery pack of the new energy automobile to be at a normal working temperature, the problem that the cruising ability of the new energy electric automobile is reduced in a low-temperature environment in winter is solved, and the damage of low-temperature charging to the battery pack is avoided.
However, the heating system for the new energy electric automobile has the following problems that because the control circuit fails, the heater cannot be reliably turned off and continuously heats up, so that the potential safety hazard that the vehicle is on fire is caused, and major safety accidents that the life safety of drivers and passengers and the property loss of the vehicle are damaged are caused, and the control circuit mainly has the following problems:
1. the MCU is not protected by crash, and when the MCU is crashed, the heater control interface is not controlled;
2. the circuit can not quickly and timely respond to close the heater effectively when the heater has short circuit and large current impact without auxiliary hardware combination protection;
3. the circuit can not quickly and timely feed back fault abnormality, so that a vehicle host control system and a driver and an occupant can not quickly and timely effectively process safety faults which harm the life safety of the driver and the occupant and property loss of the vehicle.
The safety protection control system for the electric heater of the electric automobile is provided to solve the problems.
Disclosure of Invention
The invention aims to provide a safety protection control system for an electric heater of an electric automobile, and the safety protection control system solves the existing problems.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a safety protection control system for an electric heater of an electric automobile, which comprises a first temperature acquisition unit, a second temperature acquisition unit, an MCU (microprogrammed control unit), a voltage acquisition unit, a voltage control execution module, an electric heater control driving unit, a current sampling unit, a temperature switch execution module, an MCU (microprogrammed control unit) crash-proof protection unit, a current overcurrent comparison unit, a signal comprehensive processing unit and a protection signal output unit, wherein the MCU is used for acquiring the voltage of the electric heater;
the first temperature acquisition unit is used for acquiring the working temperature information of the electric heater and transmitting the working temperature information to the MCU; the second temperature acquisition unit is used for acquiring circuit board temperature information of the electric heater drive control circuit board and transmitting the circuit board temperature information to the MCU;
the MCU receives the working temperature information transmitted by the first temperature acquisition unit, and the MCU receives the circuit board temperature information transmitted by the second temperature acquisition unit;
the MCU is used for carrying out difference analysis on the working temperature information and the circuit board temperature information, and the specific difference analysis steps are as follows:
the method comprises the following steps: firstly, acquiring working temperature information, acquiring the working temperature information once every T1 time, and marking the working temperature information as a growth working temperature Gi, i is 1. Wherein G1 represents the growth process temperature at the initial time;
step two: then obtaining circuit board temperature information, synchronously obtaining the circuit board temperature information once at intervals of T1 with the working temperature information, and marking the circuit board temperature information as a growing electric temperature Di, i is 1.. n, and n is a positive integer; wherein D1 represents the growing electric temperature at the initial time;
step three: acquiring a growth working temperature Gi, automatically calculating the average value of the growth working temperature Gi, and marking the average value as a working average value Pg;
step four: the variable value Bc is calculated by using a formula, and the specific calculation formula is as follows:
Bc＝0.412*(Gn-G1)+0.588*(Gn-Pg)；
in the formula, 0.412 and 0.588 are preset weights;
step five: then, acquiring a growing electric temperature Di, automatically calculating the average value of the growing electric temperature Di, and marking the average value as an electric average value Pd;
step six: and calculating the electrical difference value Dc by using a formula, wherein the specific calculation formula is as follows:
Dc＝0.574*(Dn-Du)+0.426*(Dn-Pd)；
wherein u-n-X1; x1 is a preset value; 0.574 and 0.426 are preset weights;
step seven: acquiring a variation value Bc and an electrical difference value Dc; carrying out difference judgment on the variation value Bc and the electrical difference value Dc to obtain a first variation value and a second variation value, and generating a variation signal according to the first variation value and the second variation value;
when the MCU detects that a change signal is generated, the MCU sends a signal to close the electric heater control driving unit and the power supply;
and when the temperature of the electric heater acquired by the temperature switch execution module is abnormal, the MCU also sends a signal to close the electric heater control driving unit and the power supply.
Further, the MCU is also used for electrifying the system for the first time, the self-check is normal, the MCU crash-proof protection unit sends a crash-proof signal, and when the MCU crash-proof protection unit is used for carrying out crash-proof operation analysis on the MCU, the specific analysis steps are as follows:
SS 1: the MCU crash-proof protection unit is used for transmitting a crash-proof signal to the MCU;
SS 2: if the MCU crash-proof protection unit detects that the MCU is in an uncontrolled state, the next step of checking is carried out;
SS 3: after T2 time, the MCU crash-proof protection unit transmits a crash-proof signal to the MCU again, and if the MCU is still in an uncontrolled state at the moment, the MCU enters the next step;
SS 4: after T3 time, the MCU crash-proof protection unit transmits a crash-proof signal to the MCU again, and if the MCU is still in an uncontrolled state at the moment, the MCU crash-proof protection unit automatically generates a crash-proof signal; otherwise, canceling the alarm and not doing any operation;
when the MCU is in a halt uncontrolled state, the electric heater control driving unit and the power supply are forcibly turned off.
Furthermore, the current sampling unit is used for collecting the working current of the electric heater and transmitting the collected working current of the electric heater to the current overcurrent comparison unit;
the current overcurrent comparison unit is used for judging the current overcurrent condition of the electric heater according to the received working current of the electric heater, and when the current is too large, the electric heater is forcibly closed to control the driving unit and the power supply.
Further, the current overcurrent comparison unit transmits the current overcurrent condition judgment result of the electric heater to the protection signal output unit.
Further, the difference determination in the step seven specifically comprises the following steps:
s1: when Bc < X2, generating a change signal, marking the change value one as 1;
when X2 is more than or equal to Bc is more than or equal to X3, a two-variable signal is generated, and the variation value one is marked as 2;
when Bc is greater than X3, generating a three-variable signal, and marking the variation value one as 3;
s2: similarly, substituting Dc into Bc, and marking the Dc as a specific numerical value of a variation value two through the same treatment;
s3: and then, when the first variation value is added with the second variation value, and when the sum exceeds three, a variation signal is generated.
The invention has the following beneficial effects:
the invention can effectively ensure the reliable operation of the electric heater, timely and effectively close the electric heater control drive unit and cut off the power supply of the electric heater when a fault occurs, and timely and effectively protect the life safety of drivers and passengers and the property safety of vehicles.
Of course, it is not necessary for any product in which the invention is practiced to achieve all of the above-described advantages at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a safety protection control system for an electric heater of an electric vehicle according to the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, the invention relates to a safety protection control system for an electric heater of an electric vehicle, which comprises a first temperature acquisition unit, a second temperature acquisition unit, an MCU, a voltage acquisition unit, a voltage control execution module, an electric heater control driving unit, a current sampling unit, a temperature switch execution module, an MCU crash prevention protection unit, a current overcurrent comparison unit, a signal comprehensive processing unit, and a protection signal output unit;
the first temperature acquisition unit is used for acquiring the working temperature information of the electric heater and transmitting the working temperature information to the MCU; the second temperature acquisition unit is used for acquiring circuit board temperature information of the electric heater drive control circuit board and transmitting the circuit board temperature information to the MCU;
the MCU receives the working temperature information transmitted by the first temperature acquisition unit, and the MCU receives the circuit board temperature information transmitted by the second temperature acquisition unit;
the MCU is used for carrying out difference analysis on the working temperature information and the circuit board temperature information, and the specific difference analysis steps are as follows:
the method comprises the following steps: firstly, acquiring working temperature information, acquiring the working temperature information once every T1 time, and marking the working temperature information as a growth working temperature Gi, i is 1. Wherein G1 represents the growth process temperature at the initial time;
step two: then obtaining circuit board temperature information, synchronously obtaining the circuit board temperature information once at intervals of T1 with the working temperature information, and marking the circuit board temperature information as a growing electric temperature Di, i is 1.. n, and n is a positive integer; wherein D1 represents the growing electric temperature at the initial time;
step three: acquiring a growth working temperature Gi, automatically calculating the average value of the growth working temperature Gi, and marking the average value as a working average value Pg;
step four: the variable value Bc is calculated by using a formula, and the specific calculation formula is as follows:
Bc＝0.412*(Gn-G1)+0.588*(Gn-Pg)；
in the formula, 0.412 and 0.588 are preset weights, and because the final results are affected differently by the two weights, the different weights are introduced for embodying;
step five: then, acquiring a growing electric temperature Di, automatically calculating the average value of the growing electric temperature Di, and marking the average value as an electric average value Pd;
step six: and calculating the electrical difference value Dc by using a formula, wherein the specific calculation formula is as follows:
Dc＝0.574*(Dn-Du)+0.426*(Dn-Pd)；
wherein u-n-X1; x1 is a preset value, and is specifically 5; both 0.574 and 0.426 are preset weights, and because the influence of the two on the final result is different, the weights are introduced for embodying;
step seven: acquiring a variation value Bc and an electrical difference value Dc; and (3) carrying out difference judgment on the variation value Bc and the electrical difference value Dc, wherein the specific difference judgment steps are as follows:
s1: when Bc < X2, generating a change signal, marking the change value one as 1;
when X2 is more than or equal to Bc is more than or equal to X3, a two-variable signal is generated, and the variation value one is marked as 2;
when Bc is greater than X3, generating a three-variable signal, and marking the variation value one as 3;
s2: similarly, substituting Dc into Bc, and marking the Dc as a specific numerical value of a variation value two through the same treatment;
s3: then, when the first variation value is added with the second variation value, and when the sum exceeds three, a variation signal is generated;
when the MCU detects that a change signal is generated, the MCU sends a signal to close the electric heater control driving unit and the power supply;
and when the temperature of the electric heater acquired by the temperature switch execution module is abnormal, the MCU also sends a signal to close the electric heater control driving unit and the power supply.
The MCU is also used for electrifying the system for the first time, the MCU crash-proof protection unit sends a crash-proof signal, when the MCU crash-proof protection unit is used for carrying out crash-proof operation analysis on the MCU, the specific analysis steps are as follows:
SS 1: the MCU crash-proof protection unit is used for transmitting a crash-proof signal to the MCU;
SS 2: if the MCU crash-proof protection unit detects that the MCU is in an uncontrolled state, the next step of checking is carried out;
SS 3: after T2 time, the MCU crash-proof protection unit transmits a crash-proof signal to the MCU again, and if the MCU is still in an uncontrolled state at the moment, the MCU enters the next step;
SS 4: after T3 time, the MCU crash-proof protection unit transmits a crash-proof signal to the MCU again, and if the MCU is still in an uncontrolled state at the moment, the MCU crash-proof protection unit automatically generates a crash-proof signal; otherwise, canceling the alarm and not doing any operation;
when the MCU is in a halt uncontrolled state, forcibly turning off the electric heater control driving unit and the power supply;
the current sampling unit is used for collecting the working current of the electric heater and transmitting the collected working current of the electric heater to the current overcurrent comparison unit;
the current overcurrent comparison unit is used for judging the current overcurrent condition of the electric heater according to the received working current of the electric heater, and when the current is too large, the electric heater is forcibly closed to control the driving unit and the power supply.
A safety protection control method for an electric automobile electric heater specifically comprises the following steps:
the method comprises the following steps: according to the temperature change condition of the electric heater and the temperature condition of the circuit board, temperature runaway judgment and protection are carried out, and the specific judgment and protection steps are as follows:
s01: the first temperature acquisition unit is used for acquiring the working temperature information of the electric heater and transmitting the working temperature information to the MCU; the second temperature acquisition unit is used for acquiring circuit board temperature information of the electric heater drive control circuit board and transmitting the circuit board temperature information to the MCU;
s02: the MCU receives the working temperature information and the circuit board temperature information;
s03: and then the MCU performs difference analysis on the working temperature information and the circuit board temperature information, wherein the specific difference analysis steps are as follows:
s031: firstly, acquiring working temperature information, acquiring the working temperature information once every T1 time, and marking the working temperature information as a growth working temperature Gi, i is 1. Wherein G1 represents the growth process temperature at the initial time;
s032: then obtaining circuit board temperature information, synchronously obtaining the circuit board temperature information once at intervals of T1 with the working temperature information, and marking the circuit board temperature information as a growing electric temperature Di, i is 1.. n, and n is a positive integer; wherein D1 represents the growing electric temperature at the initial time;
s033: acquiring a growth working temperature Gi, automatically calculating the average value of the growth working temperature Gi, and marking the average value as a working average value Pg;
s034: the variable value Bc is calculated by using a formula, and the specific calculation formula is as follows:
Bc＝0.412*(Gn-G1)+0.588*(Gn-Pg)；
in the formula, 0.412 and 0.588 are preset weights, and because the final results are affected differently by the two weights, the different weights are introduced for embodying;
s035: then, acquiring a growing electric temperature Di, automatically calculating the average value of the growing electric temperature Di, and marking the average value as an electric average value Pd;
s036: and calculating the electrical difference value Dc by using a formula, wherein the specific calculation formula is as follows:
Dc＝0.574*(Dn-Du)+0.426*(Dn-Pd)；
wherein u-n-X1; x1 is a preset value, and is specifically 5; both 0.574 and 0.426 are preset weights, and because the influence of the two on the final result is different, the weights are introduced for embodying;
s04: acquiring a variation value Bc and an electrical difference value Dc; and (3) carrying out difference judgment on the variation value Bc and the electrical difference value Dc, wherein the specific difference judgment steps are as follows:
s041: when Bc < X2, generating a change signal, marking the change value one as 1;
when X2 is more than or equal to Bc is more than or equal to X3, a two-variable signal is generated, and the variation value one is marked as 2;
when Bc is greater than X3, generating a three-variable signal, and marking the variation value one as 3;
s042: similarly, substituting Dc into Bc, and marking the Dc as a specific numerical value of a variation value two through the same treatment;
s043: then, when the first variation value is added with the second variation value, and when the sum exceeds three, a variation signal is generated;
s05: when the MCU detects that a change signal is generated, the MCU sends a signal to close the electric heater control driving unit and the power supply;
s06: and when the temperature of the electric heater acquired by the temperature switch execution module is abnormal, the MCU also sends a signal to close the electric heater control driving unit and the power supply.
Step two: MCU is normal at the first power-on self-test of system, and MCU prevents that the protection unit that crashes sends and prevents the signal of crashing, works as MCU prevents that the protection unit that crashes is used for preventing crashing operation analysis to MCU, and concrete analysis step is:
SS 1: the MCU crash-proof protection unit is used for transmitting a crash-proof signal to the MCU;
SS 2: if the MCU crash-proof protection unit detects that the MCU is in an uncontrolled state, the next step of checking is carried out;
SS 3: after T2 time, the MCU crash-proof protection unit transmits a crash-proof signal to the MCU again, and if the MCU is still in an uncontrolled state at the moment, the MCU enters the next step;
SS 4: after T3 time, the MCU crash-proof protection unit transmits a crash-proof signal to the MCU again, and if the MCU is still in an uncontrolled state at the moment, the MCU crash-proof protection unit automatically generates a crash-proof signal; otherwise, canceling the alarm and not doing any operation;
when the MCU is in a halt uncontrolled state, forcibly turning off the electric heater control driving unit and the power supply;
step three: collecting the working current of the electric heater by using a current sampling unit, and transmitting the collected working current of the electric heater to a current overcurrent comparison unit;
the current overcurrent comparison unit is used for judging the current overcurrent condition of the electric heater according to the received working current of the electric heater, and when the current is too large, the electric heater is forcibly closed to control the driving unit and the power supply.
Step four: finishing the safety protection step;
the control system has 2 overcurrent detection and judgment modes of software and hardware, when overcurrent occurs, the hardware mode rapidly acts protection through an overcurrent detection comparison unit to forcibly close the electric heater control driving unit and the power supply, meanwhile, the MCU judges whether the current sampling value has overcurrent through the software, if so, the electric heater control driving unit and the power supply are forcibly closed, and a protection signal and an alarm signal are output.
And the current overcurrent comparison unit transmits the current overcurrent condition judgment result of the electric heater to the protection signal output unit.
There are 3 ways to protect the signal output: A. the MCU controls an indicator lamp of the new energy electric automobile panel to alarm; B. the signal driving circuit directly controls the panel indicator lamp of the new energy electric automobile to alarm; C. and the MCU is connected to a finished automobile central control system through a finished automobile CAN bus, and the central control system controls and outputs alarm.
When the MCU is judged to be halted, the MCU can be judged by the following principle, when the MCU works normally, the MCU continuously outputs a pulse signal EMC _ OUT with a certain frequency, and EMC _ OUT1 outputs a low level through a differential driving circuit and the like; when the MCU is in a halt uncontrolled state, the output of the pulse signal EMC _ OUT with a certain frequency is stopped, the EMC _ OUT1 outputs a high level, and the EMC _ OUT1 outputs state change to forcibly turn off the electric heater control driving unit and the power supply.
In the description herein, references to the description of "one embodiment," "an example," "a specific example" or the like are intended to mean that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The preferred embodiments of the invention disclosed above are intended to be illustrative only. The preferred embodiments are not intended to be exhaustive or to limit the invention to the precise embodiments disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best utilize the invention. The invention is limited only by the claims and their full scope and equivalents.
Claims (5)
1. A safety protection control system for an electric heater of an electric automobile is characterized by comprising a first temperature acquisition unit, a second temperature acquisition unit, an MCU, a voltage acquisition unit, a voltage control execution module, an electric heater control driving unit, a current sampling unit, a temperature switch execution module, an MCU crash prevention protection unit, a current overcurrent comparison unit, a signal comprehensive processing unit and a protection signal output unit;
the first temperature acquisition unit is used for acquiring the working temperature information of the electric heater and transmitting the working temperature information to the MCU; the second temperature acquisition unit is used for acquiring circuit board temperature information of the electric heater drive control circuit board and transmitting the circuit board temperature information to the MCU;
the MCU receives the working temperature information transmitted by the first temperature acquisition unit, and the MCU receives the circuit board temperature information transmitted by the second temperature acquisition unit;
the MCU is used for carrying out difference analysis on the working temperature information and the circuit board temperature information, and the specific difference analysis steps are as follows:
the method comprises the following steps: firstly, acquiring working temperature information, acquiring the working temperature information once every T1 time, and marking the working temperature information as a growth working temperature Gi, i is 1. Wherein G1 represents the growth process temperature at the initial time;
step two: then obtaining circuit board temperature information, synchronously obtaining the circuit board temperature information once at intervals of T1 with the working temperature information, and marking the circuit board temperature information as a growing electric temperature Di, i is 1.. n, and n is a positive integer; wherein D1 represents the growing electric temperature at the initial time;
step three: acquiring a growth working temperature Gi, automatically calculating the average value of the growth working temperature Gi, and marking the average value as a working average value Pg;
step four: the variable value Bc is calculated by using a formula, and the specific calculation formula is as follows:
Bc＝0.412*(Gn-G1)+0.588*(Gn-Pg)；
in the formula, 0.412 and 0.588 are preset weights;
step five: then, acquiring a growing electric temperature Di, automatically calculating the average value of the growing electric temperature Di, and marking the average value as an electric average value Pd;
step six: and calculating the electrical difference value Dc by using a formula, wherein the specific calculation formula is as follows:
Dc＝0.574*(Dn-Du)+0.426*(Dn-Pd)；
wherein u-n-X1; x1 is a preset value; 0.574 and 0.426 are preset weights;
step seven: acquiring a variation value Bc and an electrical difference value Dc; carrying out difference judgment on the variation value Bc and the electrical difference value Dc to obtain a first variation value and a second variation value, and generating a variation signal according to the first variation value and the second variation value;
when the MCU detects that a change signal is generated, the MCU sends a signal to close the electric heater control driving unit and the power supply;
and when the temperature of the electric heater acquired by the temperature switch execution module is abnormal, the MCU also sends a signal to close the electric heater control driving unit and the power supply.
2. The safety protection control system for the electric heater of the electric automobile according to claim 1, wherein the MCU is further configured to power on the system for the first time and perform self-test normally, the MCU crash prevention protection unit sends a crash prevention signal, and when the MCU crash prevention protection unit is configured to perform crash prevention operation analysis on the MCU, the specific analysis steps are as follows:
SS 1: the MCU crash-proof protection unit is used for transmitting a crash-proof signal to the MCU;
SS 2: if the MCU crash-proof protection unit detects that the MCU is in an uncontrolled state, the next step of checking is carried out;
SS 3: after T2 time, the MCU crash-proof protection unit transmits a crash-proof signal to the MCU again, and if the MCU is still in an uncontrolled state at the moment, the MCU enters the next step;
SS 4: after T3 time, the MCU crash-proof protection unit transmits a crash-proof signal to the MCU again, and if the MCU is still in an uncontrolled state at the moment, the MCU crash-proof protection unit automatically generates a crash-proof signal; otherwise, canceling the alarm and not doing any operation;
when the MCU is in a halt uncontrolled state, the electric heater control driving unit and the power supply are forcibly turned off.
3. The safety protection control system for the electric heater of the electric automobile according to claim 1, wherein the current sampling unit is used for collecting the working current of the electric heater and transmitting the collected working current of the electric heater to the current overcurrent comparison unit;
the current overcurrent comparison unit is used for judging the current overcurrent condition of the electric heater according to the received working current of the electric heater, and when the current is too large, the electric heater is forcibly closed to control the driving unit and the power supply.
4. The safety protection control system for the electric heater of the electric automobile according to claim 3, wherein the current overcurrent comparison unit transmits the current overcurrent condition determination result of the electric heater to the protection signal output unit.
5. The safety protection control system for the electric heater of the electric automobile according to claim 1, wherein the difference determination in the seventh step is as follows:
s1: when Bc < X2, generating a change signal, marking the change value one as 1;
when X2 is more than or equal to Bc is more than or equal to X3, a two-variable signal is generated, and the variation value one is marked as 2;
when Bc is greater than X3, generating a three-variable signal, and marking the variation value one as 3;
s2: similarly, substituting Dc into Bc, and marking the Dc as a specific numerical value of a variation value two through the same treatment;
s3: and then, when the first variation value is added with the second variation value, and when the sum exceeds three, a variation signal is generated.
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| US20070212598A1 (en) * | 2006-03-07 | 2007-09-13 | Panasonic Ev Energy Co., Ltd. | Apparatus for controlling temperature of secondary battery, vehicle battery pack, and computer-readable medium storing program for controlling temperature of secondary battery |
| US20080009980A1 (en) * | 2006-05-16 | 2008-01-10 | Wistron Corp. | Method for controlling system to work at appropriate temperature |
| CN203084530U (en) * | 2013-01-30 | 2013-07-24 | 北京汽车新能源汽车有限公司 | Control system for PTC electric heater used for pure electric automobile |
| CN108382208A (en) * | 2018-02-26 | 2018-08-10 | 杭州翼兔网络科技有限公司 | A kind of electric vehicle integrated control system electric vehicle terminal |
| CN108923724A (en) * | 2018-08-14 | 2018-11-30 | 山东梅拉德能源动力科技有限公司 | A kind of driving motor for electric automobile and controller overheat protector system and excess temperature protection method |
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