CN208842234U - A kind of electric machine control system reducing functional safety grade - Google Patents
A kind of electric machine control system reducing functional safety grade Download PDFInfo
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- CN208842234U CN208842234U CN201821247623.9U CN201821247623U CN208842234U CN 208842234 U CN208842234 U CN 208842234U CN 201821247623 U CN201821247623 U CN 201821247623U CN 208842234 U CN208842234 U CN 208842234U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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- Y02T10/72—Electric energy management in electromobility
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Abstract
The utility model provides a kind of electric machine control system for reducing functional safety grade, including gas pedal, entire car controller, electric machine control system, motor transmission mechanism and wheel, wherein, the throttle signal output end of the gas pedal is connect with the entire car controller, the entire car controller is connect by CAN bus with the electric machine control system, the electric machine control system is connect by the motor transmission mechanism with the wheel, any position on the motor transmission mechanism or wheel is equipped with revolving speed acquisition device, the output end of the revolving speed acquisition device is connect with the entire car controller.The beneficial effects of the utility model are: reduce the functional safety grade of electric machine control system, to reduce costs and technical difficulty.
Description
Technical field
The utility model relates to electric car functional safety technology more particularly to a kind of motors for reducing functional safety grade
Control system.
Background technique
Electric car is because its energy-saving and emission-reduction, pollution are small, and as each big city gradually limits board, the hair of electric car industry
Exhibition is become better and better.Pure electric automobile becomes the mainstream of the strategy of energy conservation and new energy development more because of its environment-friendly advantage.
Vehicle intellectualized in recent years, networking, motorized become the trend of automobile future development, and as nobody is automatic
The rise of driving, automobile general safety turn to active safety, the probability of happening to fail in reduction system, control from passive security
Risk processed.
With the electrical E/E system of vehicle electric and ADAS(DAS (Driver Assistant System)) quantity is continuously increased, vehicle safety, section
Energy, environmental protection, low-carbon, integrated, information-based, intelligent, networking, automation function are more and more, and the E/E(electronics in vehicle/
Electrically) system is more and more.Promote based on " IEC 61508 ", to meet the specific of the electric system of road vehicle
Demand and the birth for writing " ISO 26262 ".
Because the execution of ISO26262 standard will largely reduce traffic thing caused by the failure of vehicle level
Therefore failure rate and the risk recalled, outstanding vehicle factor (BMW, masses, Toyota, general etc.) is for major components both at home and abroad
Factory proposes the requirement of high functional safety grade and security target, and proposes that being unsatisfactory for ISO26262 standard is not eligible for participating in throwing
Mark activity.It is domestic and international outstanding components factory that thus exploitation, which meets the electric car components of functional safety (ISO26262) standard,
Quotient's technical problem urgently to be resolved.
The implementation of ISO26262 standard and according to the standard development product, cost is that cost that is high, paying will compare
It is larger.Software development uses AUTOSAR(automobile open system framework) the platform progress Embedded exploitation of software；Due to needing to examine
Worry safety leads to entire hardware component and the cost of design is also very big.Entirety gets off the cost of product can be very high, together
The cost of sample vehicle is also very high, moreover without corresponding client, period of cost recovery is long, complete product certification and realizes product volume production
Also not within the foreseeable future, many enterprises are unwilling to undertake the cost of this part, are constantly in the state of looking around.But with national policy
From the point of view of supporting the state of development with electric car industry, commercial vehicle market is gradually saturated, and automobile industry enterprise gradually turns battlefield
To passenger car, therefore passenger car market will welcome one section of outbreak period, and passenger car develops that requirement is higher than commercial vehicle, difficulty
Bigger, passenger car main product currently on the market meets the fewer and fewer of functional safety requirement, so solving the safety of vehicle
Problem, the technological reserve for carrying out related fields become imperative and very urgent, it will improve the core competitiveness of enterprise.
There are four ASIL grades (Automotive Safety Integration Level, vehicle safety grade) etc.
Grade, respectively ASIL A, ASIL B, ASIL C, ASIL D, wherein ASIL A is the lowest class, and ASIL D is highest level.
ASIL grade determines the requirement of whole system safety, and ASIL higher grade, higher to the security requirement of system, to realize
The cost paid safely is bigger, it is meant that the diagnosis coverage rate of hardware is higher, and development process is stringenter, and corresponding development cost increases
Add, development cycle extension, demands strict technology.To solve the above difficult point, it is necessary under the premise of meeting security target, propose
Reducing the scheme of ASIL grade --- ASIL grade is decomposed.The function logic of the high system of ASIL grade becomes after decomposing
Simply, so that exploitation becomes simple, overall cost is reduced.
VCU executes driver intention, is the big of vehicle according to Driving Scene and vehicle condition real time monitoring vehicle operation
Brain.BMS is the support of automotive power, is the core of vehicle energy management.MCU is the core component for driving vehicle.ABS is anti-
When driving can be improved in locking brake system, the safety coefficient of emergency brake of vehicle.The security target of VCU under normal conditions: it turns round
Square safety, high-voltage safety；The security target of BMS: high-voltage safety；The security target of MCU: torque safety；ABM security target:
Anti-lock safety.
The development of ISO26262 standard at home only only has several years, everybody is unfamiliar with the understanding of standard.Domestic vehicle
Enterprise do whole vehicle functions it is safe when, all according further to the experience of external vehicle enterprise from vehicle level based on dynamical system
HARA (hazard analysis and risk assessment) analysis is done, torque safety target and corresponding is obtained according to existing Control of Electric Vehicles strategy
ASIL grade.HARA analysis is carried out to other components on vehicle again based on this and obtains other security targets and ASIL etc.
Then grade proposes functional safety demand and target to each components manufacturer, components manufacturer is according to functional safety demand and target
It goes to develop corresponding product；Last main engine plants meet the offer of each components manufacturer zero of corresponding function demand for security and target
Part assembles the test verifying for carrying out Full Vehicle System again.Identical function peace can be inevitably proposed on different components in this way
Full target makes that the exploitation complexity of functional safety components increases, technical difficulty is excessively high, development cost are also higher, development risk
Greatly；And period of cost recovery is long.See Fig. 1, existing vehicle level electric machine control system functional safety block architecture diagram, work
Principle is: VCU(entire car controller) throttle signal is converted into accordingly according to the intention (depth of accelerator pedal) of driver
Torque signal, pass through CAN(controller local area network) bus communication gives MCU(electric machine control system) send corresponding torque and ask
Order is asked, MCU exports corresponding torque according to the torque request order of VCU.The phase current and angle value that MCU passes through acquisition motor
If it is more than the rear entrance of ± 50N.m or opposite that inverse actual torque gives torque and be compared with the difference in torque of preset value with CAN
Safe condition cuts off torque output.Function peace will be done according to the torque output function of present principle Analysis VCU and MCU
Congruent grade show that torque functional safety grade is ASIL C by HARA analysis at present, when security target is that torque occurs abnormal
Directly shutdown torque output；Other component BMS(battery management system) high voltage functionality be ASIL C safely；The torque function of VCU
It can be ASIL C safely；The warning function of instrument is ASIL A safely.The torque functional safety grade ASIL C of VCU and MCU, etc.
The relatively high and two systems of grade do torque functional safety, and not only the ASIL grade of vehicle level is not improved, whole
Highest ASIL grade in interior all components, and also increase the development difficulty of VCU and MCU.
The shortcomings that prior art is that electric machine control system needs to accomplish torque functional safety into ASIL C grade.It is complicated
Degree, technical difficulty are larger；Development cost is also high；Period of cost recovery is long, project development risk is big.VCU and MCU does torque function
Safe design is from the point of view of the ASIL grade of vehicle level, it is not necessary that because the ASIL grade of vehicle has in all components most
High security level determines.Therefore, if the functional safety grade of electric machine control system is reduced, thus to reduce cost, technology
Difficulty and project development risk are those skilled in the art's technical problems urgently to be resolved.
Utility model content
In order to solve the problems in the prior art, the utility model provides a kind of motor control for reducing functional safety grade
System processed.
The utility model provides a kind of electric machine control system for reducing functional safety grade, including gas pedal, vehicle
Controller, electric machine control system, motor transmission mechanism and wheel, wherein the throttle signal output end of the gas pedal and institute
Entire car controller connection is stated, the entire car controller is connect by CAN bus with the electric machine control system, the motor control
System is connect by the motor transmission mechanism with the wheel, and any position on the motor transmission mechanism or wheel is set
There is revolving speed acquisition device, the output end of the revolving speed acquisition device is connect with the entire car controller.
The electric machine control system for reducing functional safety grade further includes electricity as a further improvement of the utility model,
Pond management system and instrument, the entire car controller are connect with the battery management system, instrument respectively by CAN bus, institute
Battery management system is stated to connect with the high voltage input terminal of the electric machine control system.
The electric machine control system for reducing functional safety grade further includes storing as a further improvement of the utility model,
Battery and water-cooling system, the battery, water-cooling system are connect with the electric machine control system respectively.
The motor transmission mechanism includes motor output shaft and rotation shaft of wheel as a further improvement of the utility model,
The electric machine control system is connect with the motor output shaft, and the motor output shaft is connect with the rotation shaft of wheel, the vehicle
Wheel is arranged in the both ends of the rotation shaft of wheel, and the motor output shaft is arranged in, in rotation shaft of wheel in the revolving speed acquisition device
Any one or any combination.
The beneficial effects of the utility model are: through the above scheme, the functional safety grade of electric machine control system is reduced,
That is ASIL grade, so that complexity and technical difficulty are reduced, so that project development cost and development risk obtain to a certain extent
Reduction.
Detailed description of the invention
Fig. 1 is the schematic diagram of electric machine control system in the prior art.
Fig. 2 is a kind of schematic diagram for the electric machine control system for reducing functional safety grade of the utility model.
Fig. 3 is a kind of ASIL C grade resolution model for the electric machine control system for reducing functional safety grade of the utility model
Figure.
Specific embodiment
The utility model is described in further detail for explanation and specific embodiment with reference to the accompanying drawing.
As shown in Fig. 2, a kind of electric machine control system for reducing functional safety grade, including gas pedal 1, entire car controller
(VCU) 2, electric machine control system (MCU) 3, motor transmission mechanism 4 and wheel 5, wherein the throttle signal of the gas pedal 1 is defeated
Outlet is connect with the entire car controller 2, and the entire car controller 2 is connect by CAN bus with the electric machine control system 3,
The electric machine control system 3 is connect by the motor transmission mechanism 4 with the wheel 5, the motor transmission mechanism 4 or vehicle
Wheel 5 is equipped with revolving speed acquisition device, and the output end of the revolving speed acquisition device is connect with the entire car controller 2.
As shown in Fig. 2, the electric machine control system for reducing functional safety grade further includes battery management system (BMS) 6
With instrument 7, the entire car controller 2 is connect with the battery management system 6, instrument 7 respectively by CAN bus, the battery
Management system 6 is connect with the high voltage input terminal of the electric machine control system 3.
As shown in Fig. 2, the electric machine control system for reducing functional safety grade further includes battery 8 and water-cooling system 9,
The battery 8, water-cooling system 9 are connect with the electric machine control system 3 respectively.
As shown in Fig. 2, the motor transmission mechanism 4 includes it is preferred that being equipped with revolving speed acquisition device on motor transmission mechanism 4
Motor output shaft and rotation shaft of wheel, the electric machine control system 3 are connect with the motor output shaft, the motor output shaft and institute
Rotation shaft of wheel connection is stated, the both ends of the rotation shaft of wheel are arranged in the wheel 5, and the revolving speed acquisition device is arranged in the electricity
Any one in machine output shaft, rotation shaft of wheel or any combination.
As shown in Fig. 2, it is a kind of reduce functional safety grade electric machine control system, the course of work the following steps are included:
S1, gas pedal 1 send throttle signal to entire car controller 2；
Throttle signal is converted into revolving speed request and is sent to electric machine control system 3 by CAN bus by S2, entire car controller 2；
S3, electric machine control system 3 are requested according to revolving speed, export corresponding torque to wheel 5 by motor transmission mechanism 4；
S4, entire car controller 2 acquire vehicle revolving speed on motor transmission mechanism 4 or wheel 5, and by collected vehicle
Revolving speed is compared with revolving speed request, if entire car controller cuts off electricity by CAN communication beyond the secure threshold pre-seted
The high pressure of pond management system BMS, so that both electric machine controller and entire car controller cut off torque output enters safe condition,
Then guarantee vehicle safety.
As shown in Fig. 2, in step s 4, if entire car controller 2 crosses CAN bus to electricity beyond the threshold value pre-seted
Pond management system 6, which is sent, disconnects main contactor request, and battery management system 6 disconnects main contactor to disconnect electric machine control system
3 high pressure then guarantees vehicle so that both electric machine controller and entire car controller cut off torque output enters safe condition
Safety.
As shown in Fig. 2, in step s 4, the secure threshold pre-seted includes rotary speed threshold value and acceleration rate threshold, vehicle control
Device 2 processed by collected vehicle revolving speed compared with revolving speed requests to carry out rotational speed difference, if beyond the rotary speed threshold value that pre-sets, it is whole
Vehicle controller cuts off the high pressure of battery management system BMS by CAN communication, so that entire car controller and electric machine controller are both
Cutting torque output enters safe condition, then guarantees vehicle safety.Entire car controller 2 is obtained according to collected vehicle revolving speed
Acceleration value (i.e. percentage of speed rise) compares acceleration value with acceleration rate threshold, if acceleration value exceeds acceleration threshold
Value, then entire car controller cuts off the high pressure of battery management system BMS by CAN communication, thus entire car controller and motor control
Both device cuts off torque output and enters safe condition, then guarantee vehicle safety.
According to the understanding now to ISO26262 standard, go to understand whether functional safety, final vehicle pacify from vehicle level
Entirely, it will be all embodied directly in the rotary speed of vehicle forward or backward, traditional functional safety scheme is exactly by by torque at present
Function accomplishes that safety reaches revolving speed safety or even vehicle safety with this.It is subsequently assumed that directly doing revolving speed control function in vehicle level
Safety is that the torque function of vehicle does not just have to reach high ASIL grade, and electric machine control system 3 is made not have to follow ISO
26262 standards are developed, to greatly save functional safety research and development and the Material Cost of great number.As shown in Fig. 2, VCU
Throttle signal is directly changed into revolving speed request according to driving intention and carries out CAN communication hair by CAN bus by (entire car controller 2)
Give MCU(electric machine control system 3), MCU(electric machine control system 3) directly in response to corresponding revolving speed, then VCU(full-vehicle control
Device 2) in any one of machine shaft output end to vehicle wheel side place (these places of the A point or B point of such as Fig. 2) acquisition vehicle revolving speed
(scheme including any acquisition vehicle revolving speed) is compared with the VCU request revolving speed request for issuing MCU, if beyond pre-seting
Revolving speed and acceleration range, VCU by CAN bus to BMS send disconnect main contactor request, disconnect high pressure, such MCU and
VCU cutting torque output enters safe condition, to guarantee the safety of vehicle.This scheme is according to ASIL grade decomposition method, VCU
Rotating speed functions security level be ASIL C (C)；Moment of torsion control and torque output are exactly QM (C).According to 26262 standard of ISO,
MCU is developed with regard to only needing to follow QM grade；The high pressure cut-off security level of BMS is ASIL C.
As shown in figure 3, condition and principle that ASIL grade is decomposed, as follows:
ASIL decomposition needs demand for security to have redundancy, and is executed by mutually independent element.
ASIL decomposition allows to be used to ensure the same of the same security target several by the ASIL grade of demand for security
It is allocated between the element of demand for security.Under given conditions, allow to carry out between expectation function and its corresponding security mechanism
ASIL is decomposed.
It is decomposed according to the demand for security of a pair of ASILC of following modes:
The demand of one ASIL B (C) and the demand of an ASIL A (C)；
The demand of one ASIL C (C) and the demand of a QM (C).
A kind of electric machine control system reducing functional safety grade provided by the utility model, is related to electric car function peace
Full technology, in particular to electric car reduce the functional safety side of electric machine control system torque safety ASIL grade in vehicle level
The shortcomings that case, prior art is that electric machine control system needs to accomplish torque functional safety into ASIL C grade.Complexity, skill
Art difficulty is larger；Development cost is also high；And the utility model only needs torque functional safety accomplishing that QM can meet vehicle
The security target of level, so that the complexity and technological difficulties of torque control system are reduced, integral vehicle cost can also be dropped
It is low.
Note: QM is the grade that quality requirement is not belonging to functional safety system；ASIL grade is divided into four grade difference
Are as follows: ASIL A, ASIL B, ASIL C, ASIL D.ASIL D is highest level.
A kind of electric machine control system reducing functional safety grade provided by the utility model, has the advantage that
1, according to the standard of functional safety, the functional safety scheme for reducing vehicle safety grade is considered from vehicle level；
2, the security level of the security target of vehicle level is decomposed, reduces the functional safety etc. of vehicle components
Grade, thus the complexity and technical difficulty of exploitation；
3, functional safety project development expense and production cost are reduced to reduce the cost and project development wind of vehicle
Danger.
4, electric machine control system components producer is freed, is designed without being directed to torque functional safety again, only
Torque safety is done in VCU, conceptual design is relatively easy.
Compared with prior art, a kind of electric machine control system reducing functional safety grade provided by the utility model, tool
There are following characteristics:
1, what the prior art was more is that functional safety is done on electric machine controller, and the application then looks for another way from vehicle level
Consider to integrate the design that each components reach said function security level, realizes and the decomposition of motor control feature capability safety is dropped
Grade.
2, the implementation of the application be from motor output shaft to wheel on any one place acquisition vehicle revolving speed letter
Exception is judged with percentage of speed rise compared with number carrying out rotational speed difference with the VCU revolving speed value request for being sent to MCU, if there is different
Often, VCU sends abnormal signal by CAN and cuts off electrical source of power output to BMS, hence into safe condition.
3, the complexity and technological difficulties of the exploitation of electric machine control system functional safety are reduced.
4, components functional safety project development cost and material are reduced simultaneously originally, to reduce the cost of vehicle.
It, cannot the above content is specific preferred embodiment further detailed description of the utility model is combined
Assert that the specific implementation of the utility model is only limited to these instructions.For the ordinary skill of the utility model technical field
For personnel, without departing from the concept of the premise utility, a number of simple deductions or replacements can also be made, should all regard
To belong to the protection scope of the utility model.
Claims (4)
1. it is a kind of reduce functional safety grade electric machine control system, it is characterised in that: including gas pedal, entire car controller,
Electric machine control system, motor transmission mechanism and wheel, wherein the throttle signal output end of the gas pedal and the vehicle control
Device connection processed, the entire car controller are connect by CAN bus with the electric machine control system, and the electric machine control system passes through
The motor transmission mechanism is connect with the wheel, and any position on the motor transmission mechanism or wheel is adopted equipped with revolving speed
The output end of acquisition means, the revolving speed acquisition device is connect with the entire car controller.
2. the electric machine control system according to claim 1 for reducing functional safety grade, it is characterised in that: the reduction function
The electric machine control system of energy security level further includes battery management system and instrument, and the entire car controller passes through CAN bus point
It is not connect with the battery management system, instrument, the high voltage input terminal of the battery management system and the electric machine control system
Connection.
3. the electric machine control system according to claim 1 for reducing functional safety grade, it is characterised in that: the reduction function
Can the electric machine control system of security level further include battery and water-cooling system, the battery, water-cooling system respectively with it is described
Electric machine control system connection.
4. the electric machine control system according to claim 1 for reducing functional safety grade, it is characterised in that: the motor passes
Motivation structure includes motor output shaft and rotation shaft of wheel, and the electric machine control system is connect with the motor output shaft, the motor
Output shaft is connect with the rotation shaft of wheel, and the both ends of the rotation shaft of wheel are arranged in the wheel, and the revolving speed acquisition device is set
Set any one in the motor output shaft, rotation shaft of wheel or any combination.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821247623.9U CN208842234U (en) | 2018-08-03 | 2018-08-03 | A kind of electric machine control system reducing functional safety grade |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201821247623.9U CN208842234U (en) | 2018-08-03 | 2018-08-03 | A kind of electric machine control system reducing functional safety grade |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108749648A (en) * | 2018-08-03 | 2018-11-06 | 深圳市大地和电气股份有限公司 | A kind of electric machine control system and method reducing functional safety grade |
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2018
- 2018-08-03 CN CN201821247623.9U patent/CN208842234U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108749648A (en) * | 2018-08-03 | 2018-11-06 | 深圳市大地和电气股份有限公司 | A kind of electric machine control system and method reducing functional safety grade |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20191216 Address after: 563000 Guizhou new energy automobile industrial park, Nanguan sub district office, southern New District, Zunyi City, Guizhou Province Patentee after: ZUNYI DADIHE ELECTRIC CO., LTD. Address before: 518000 floor 3 A7, Fuhai information port, Qiaotou community, Fuhai street, Shenzhen, Guangdong, China, Baoan District, China Patentee before: SHENZHEN GREATLAND ELECTRICS INC. |
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| TR01 | Transfer of patent right |