CN105216649A - A kind of novel entire car controller being applicable to pure electric automobile - Google Patents
A kind of novel entire car controller being applicable to pure electric automobile Download PDFInfo
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- CN105216649A CN105216649A CN201510738514.1A CN201510738514A CN105216649A CN 105216649 A CN105216649 A CN 105216649A CN 201510738514 A CN201510738514 A CN 201510738514A CN 105216649 A CN105216649 A CN 105216649A
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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
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Abstract
The invention discloses a kind of novel entire car controller being applicable to pure electric automobile.Comprise power supply, main MCU, auxiliary MCU, the first signal processing circuit, secondary signal treatment circuit, communication module, power driving circuit, the mouth of the first signal processing circuit is connected with the input end of main MCU, communication module, power driving circuit are connected with the mouth of main MCU simultaneously, assist MCU to be connected with main MCU and realize two way communication, secondary signal treatment circuit is connected with the input end of auxiliary MCU, and the mouth of auxiliary MCU is also connected with the input end of power driving circuit and communication module; Operationally, main MCU collection signal also carries out computing, then exports corresponding control command to controlled mechanism, the heartbeat signal of the auxiliary main MCU of MCU Real-time Collection; When main MCU breaks down, performed the collection control process of main MCU by auxiliary MCU.Present invention efficiently solves traditional entire car controller in resource, load capacity, the problem of the aspects such as safety monitoring.
Description
Technical field
The present invention relates to a kind of novel entire car controller being applicable to pure electric automobile, belong to full-vehicle control field.
Background technology
Entire car controller is equivalent to the brain of automobile, it performs the multi-task in vehicle traveling process, concrete function comprises: (1) receives, the driver behavior instruction of process chaufeur, and to all parts controller sending controling instruction, makes vehicle expect to travel by driving; (2) carry out reliable communicating with motor, DC/DC, Li-ion batteries piles etc., carry out the Gather and input of state and the output of control command amount by CAN (and analog quantity of key message); (3) receive each components information of process, provide current energy situation information in conjunction with energy management unit; (4) judgement of the system failure and storage, dynamic detection system information, the fault that record occurs; (5) have defencive function to car load, the classification depending on fault carries out cascade protection to car load, in emergency circumstances can cut off bus high-pressure system; (6) other electric equipmenies on car are coordinated and managed.
At present, the similar scheme of entire car controller mainly adopts two kinds: (1) 16 MCU to do main control chip, and peripheral drive circuit uses the discrete components such as capacitance-resistance to build; (2) 32 MCU do main control chip, and peripheral drive circuit uses integrated chip.
Such scheme has following shortcoming:
(1) application software aspect majority rests on functional realiey, and software diagnosis function, car load safety control strategy, monitoring function all have to be optimized and improve.
(2) Some Enterprises can introduce relevant equipment and software according to V-type development process (a kind of software and product development instrument), generally uses general developing instrument to carry out secondary development; Existing instrument biases toward early development, is unfavorable for the industrialized development of product, and basic database imperfection affects entire car controller design level.
(3) integrated strength is weaker, and manufacturing capacity is poor, and reliability and stability still have very large room for promotion.
(4) current each electric automobile whole enterprise control unit interface and network communication protocol definition different, cause the commonality between controller and reusability poor, be unfavorable for industrialization and the scale of controller.
Summary of the invention
The object of the present invention is to provide a kind of novel entire car controller being applicable to pure electric automobile, mainly solve existing entire car controller interface resource not enough, power-handling capability is poor, and quiescent dissipation is high, and safety management is poor, the problem of error detection.Present invention efficiently solves traditional entire car controller in resource, load capacity, the problem of the aspects such as safety monitoring.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind of novel entire car controller being applicable to pure electric automobile, comprise power supply, main MCU, auxiliary MCU, the first signal processing circuit, secondary signal treatment circuit, communication module, power driving circuit, the mouth of the first signal processing circuit is connected with the input end of main MCU, communication module, power driving circuit are connected with the mouth of main MCU simultaneously, assist MCU to be connected with main MCU and realize two way communication, secondary signal treatment circuit is connected with the input end of auxiliary MCU, and the mouth of auxiliary MCU is also connected with the input end of power driving circuit and communication module;
Operationally, main MCU collection signal also carries out computing, then exports corresponding control command to controlled mechanism, the heartbeat signal of the auxiliary main MCU of MCU Real-time Collection; When main MCU breaks down, performed the collection control process of main MCU by auxiliary MCU.
Particularly, described first signal processing circuit and secondary signal treatment circuit include the modulate circuit for the treatment of analog signal and the voltage conversion circuit for the treatment of digital signal, and power driving circuit comprises outputting analog signal, digital signal, the D/A converting circuit of digital signal, low-power drive circuit, superpower driving circuit respectively.
Further, described communication module adopts CAN to communicate.
Further, described main MCU, auxiliary between MCU and CAN transceiver, adopt high-speed light every device 4N25.
As preferably, described main MCU has selected micro controller system MPC5634, and auxiliary MCU selects micro controller system MC9S12XEP100.
Further, power driving circuit adopts the smart power switch chip TLE6220GP of 4 passages.
Further, when described main MCU breaks down, auxiliary MCU collection signal, closes the CAN transceiver of main MCU, and the communication undertaken by CAN and each node of car load CAN network under safe condition, and replace main MCU and go the car load of drived control relay to run.
In addition, described power supply is converted to voltage needed for entire car controller by the power supply of electronlmobil through power management module, and this power management module comprises 24V and turns 5V and 5V and turn 3.3V two circuit.
Compared with prior art, the present invention has following beneficial effect:
(1) radical function of auxiliary MCU of the present invention is trouble diagnosing, auxiliary MCU gathers the monitoring of heartbeat signal realization to main MCU operation conditions of main MCU, when main MCU breaks down, collection signal is continued by auxiliary MCU, when support vehicles safety, close the CAN transceiver of main MCU, replace main MCU to perform safety traffic function.The communication under safe condition is carried out by CAN and each node of car load CAN network, and replacing main MCU goes the car load of drived control relay to run, ultimate guarantee vehicle has basic driving functions under the state of entire car controller fault, because the Main Function of auxiliary MCU is the safety traffic function guarantee that fault detection and main MCU break down in situation, such design adds the safety of whole system.
(2) the present invention has High Performance, the entire car controller of high reliability is the basic guarantee realizing Control of Electric Vehicles.Hardware design of the present invention takes into account functional and engineering, and entire car controller has good electromagnetic compatibility; Modular design method reduces cost, shortens the R&D cycle, is conducive to the normalisation of hardware design, seriation, for the hardware and software platform design of entire car controller lays the foundation; HILS test and stand test show that entire car controller hardware system meets hybrid power system requirement, and have carried out early-stage preparations for real train test.The method that the design of some of them important module circuit and system reliability design adopt, for the exploitation of all kinds of electric vehicle controller is from now on laid a good foundation.
Accompanying drawing explanation
Fig. 1 is the system chart of pure electric vehicle.
Fig. 2 is system chart of the present invention.
Fig. 3 is the system chart of the main MCU of the present invention-embodiment.
Fig. 4 is the present invention-embodiment Double MCUs Architecture figure.
Fig. 5 is the present invention-embodiment power-switching circuit figure.
Fig. 6 is the low effective on-off signal modulate circuit figure of the present invention-embodiment.
Fig. 7 is the high effectively on-off signal modulate circuit figure of the present invention-embodiment.
Fig. 8 is the present invention-embodiment analog signal conditioner circuit diagram.
Fig. 9 is the present invention-embodiment heartbeat signal processing circuit figure.
Figure 10 is the present invention-embodiment wheel velocity signal capturing circuit diagram.
Detailed description of the invention
Below in conjunction with embodiment and accompanying drawing, the invention will be further described, and embodiments of the present invention include but not limited to the following example.
As shown in Figure 1, it is made up of entire car controller, motor and electric machine controller thereof, power battery pack, battery management system, change-speed box, main reduction gear, ancillary system etc. the structure of pure electric vehicle.Wherein ancillary system comprises steer motor and steer motor controller, air-conditioner electromotor and air-conditioner electromotor controller, brake system, battery charger, DCDC etc.Power battery pack is vehicle power source, for all devices provides power.Chaufeur is reached by whole-control system and controls the entirety of vehicle.
The principle of design of entire car controller and demand analysis: the overall principle of entire car controller hardware design is the safe and reliable of system; with reference to the designing requirement of ISO26262; when main MCU et out of order or mis-calculate time; auxiliary MCU can independently manage disconnected function to crucial actr, thus plays security monitoring and the defencive function of system.Entire car controller, it performs the multi-task in vehicle traveling process, and concrete function comprises: driver intention analysis; Road condition identification; Complete vehicle fault classification process; Car load driving mode controls; Walk lamely; Constant speed of cruising function; Remaining mileage is estimated; Ability optimum management; Safety management; Online integration is demarcated and monitoring function.
Embodiment
As shown in Figure 2, a kind of novel entire car controller being applicable to pure electric automobile, comprises power supply, main MCU, auxiliary MCU, the first signal processing circuit, secondary signal treatment circuit, communication module, power driving circuit.Wherein, power supply is above-mentioned all module for power supply, the input end of the first signal processing circuit is connected with the input end of main MCU, communication module, power driving circuit are connected with the mouth of main MCU simultaneously, assist MCU to be connected with main MCU and realize two way communication, secondary signal treatment circuit is connected with the input end of auxiliary MCU, and the mouth of auxiliary MCU is also connected with the input end of power driving circuit and communication module.
In the present embodiment, as shown in Figure 3, first signal processing circuit and secondary signal treatment circuit include the modulate circuit of Analog signals and the voltage conversion circuit of processing digital signal, and power driving circuit comprises outputting analog signal, digital signal, the D/A converting circuit of digital signal, low-power drive circuit, superpower driving circuit respectively.Communication module output communication signal.
In the present embodiment, communication module adopts CAN to communicate.Main MCU has selected 32 micro controller system MPC5634 of freescale, and power based on 5V, this chip all has superior performance in arithmetic capability, storage space, digital quantity, analog quantity, input and output and CAN communication, is the main product of vehicle electric field.Auxiliary MCU selects 16 micro controller system MC9S12XEP100 of freescale.
MCU is the core of entire car controller, it is responsible for all logic operations of data sampling and processing, in order to improve the reliability of controller, the present invention adopts Double MCUs Architecture, main MCU is responsible for collection signal and carries out computing, then according to control logic, corresponding control command is exported to controlled mechanism, thus complete entire car controller expectation function.
In the present embodiment, the concrete structure of Double MCUs Architecture as shown in Figure 4.
In the diagram, first signal processing circuit is connected with incoming signal with secondary signal treatment circuit simultaneously, these incoming signals comprise acceleration pedal signal, brake pedal signal, gear pedal signal, impact switch signal, high-voltage interlocking signal, ignition lock signal etc., in the middle of these signals, acceleration pedal signal, brake pedal signal are analog signal, therefore send into modulate circuit to process, other are digital signal, send into voltage conversion circuit and process.Auxiliary MCU is connected with the input end of power driving circuit with the mouth of main MCU simultaneously.
Assist MCU to be connected with main MCU and realize two way communication, the radical function of auxiliary MCU is trouble diagnosing, auxiliary MCU gathers the monitoring of heartbeat signal realization to main MCU operation conditions of main MCU, when main MCU breaks down, collection signal (acceleration pedal, brake pedal, gear pedal, impact switch etc.) is continued by auxiliary MCU, when support vehicles safety, close the CAN transceiver of main MCU, replace main MCU to perform safety traffic function.The communication under safe condition is carried out by CAN and each node of car load CAN network, and replacing main MCU goes the car load of the relays such as drived control water pump, fan, vacuum pump to run, and ultimate guarantee vehicle has basic driving functions under the state of entire car controller fault.
Due to the driving of power driving circuit mainly relay; comprise water pump relay, vacuum pump relay, cooling fan relay, air conditioner electrical equipment, charge relay; therefore in the present embodiment; power driving circuit adopts the smart power switch chip TLE6220GP of 4 passages; this chip can drive No. 4 relays simultaneously, and 4 tunnel parallel drive abilities are 1A, and single channel fan-out capability is 3A; have excess temperature, overvoltage and short trouble defencive function, failure message is transmitted by spi bus.Under car load service condition, main MCU is controlled No. 4 relays by the IN1 ~ IN4 of TLE6220GP, when auxiliary MCU detects that main MCU exists fault, controlled by auxiliary MCU No. 4 relays by the IN1 ~ IN4 of TLE6220GP, in whole process, auxiliary MCU also reads the failure message of TLE6220GP by spi bus.Because the Main Function of auxiliary MCU is the safety traffic function guarantee that fault detection and main MCU break down in situation, such design adds the safety of whole system.
In the present embodiment, power supply due to pure electric truck is 24V, and the operating voltage of the chip MCU such as the microprocessor of entire car controller is 5V or 3.3V, therefore needing by power management module is the voltage that MCU chip is applicable to by 24V Power convert, power management module comprises 24V and turns 5V and 5V and turn 3.3V two circuit, entire car controller also will provide 5V power supply for acceleration pedal, brake pedal, sensor, consistent with the datum that analog signal inputs to ensure the reference pad of AD converter.
For ensureing the stability that voltage exports and good antijamming capability, 24V turns 5V circuit and adopts GM7130 chip, the switching power source chip of GM7130 to be a fan-out capability be 3A.Adopt rational components and parts configure can make GM7130 output accuracy under 7 ~ 40V DC input voitage be positive and negative 4% 5V voltage.Power supply necessarily requires by tests such as electrostatic discharge, conducted emission, radiation-emittings.Therefore, will accomplish good bypass and filtering in the input and output side of GM7130, filter capacitor is withstand voltage is 50V, to ensure the electrostatic discharge testing bearing 38V.Common mode inductance to be adopted to suppress common mode current, increase TVS pipe and absorb surge current.
5V turns 3.3V circuit layout and adopts linear power supply GM6605-3.3 chip.Consider the Switching Power Supply of this chip PWM chop control, output stage work dominant frequency is the MCU of 40MHz, and input and output level all has higher requirements to isolation and filtering, therefore, uses filter in input and output level.
The 5V power supply externally provided uses automotive grade three terminal regulator TL431 to export from the power taking of 24V power plane.As shown in Figure 5.
In the present embodiment, the first signal processing circuit and secondary signal treatment circuit all will gather signal, and these signals comprise analog signal and digital signal.
(1) digital signal acquiring
The incoming signal of entire car controller comprises on-off signal, analog signal, impulse singla.Wherein on-off signal comprises high effectively and low effective two kinds, for on-off signal collection, and demand fulfillment: to power supply with to the short-circuit protection of bonding, MCU low and high level threshold requirement, electrostatic and conducted interference protection.As shown in Figure 6, high effectively on-off signal modulate circuit as shown in Figure 7 for low effective on-off signal modulate circuit.
For low effective on-off signal modulate circuit, wherein, pull-up resistor demand fulfillment is to power supply and the short-circuit protection requirement to bonding; Divider resistance need meet the requirement of micro controller system to the requirement of low and high level threshold value, voltage clamping and micro controller system Injection Current; Electric capacity will meet the requirement of electrostatic and conducted interference.
For the effective on-off signal modulate circuit of height, wherein, divider resistance need meet the requirement of micro controller system to the requirement of low and high level threshold value, voltage clamping and micro controller system Injection Current; Electric capacity will meet the requirement of electrostatic and conducted interference.
(2) collection of simulant signal
The mimic imput signal of entire car controller comes from acceleration pedal, brake pedal, baroceptor etc., and voltage range is between 0 ~ 5V.After this kind of signal filtering, for increasing power-handling capability, the AD mouth delivering to MCU after generally carrying out voltage transitions with voltage follower carries out A/D conversion.Analog signal conditioner circuit as shown in Figure 8.
Frequency signal comprises from electric machine controller and the heartbeat signal of battery management system and the wheel speed signal of 4 road wheel speed sensors.Heartbeat signal characteristic: OC door exports, frequency 1Hz, as shown in Figure 9.
Wheel speed sensors is Hall, and the signal that wheel speed sensors exports is current impulse, and as shown in Figure 10, R1 is sampling resistor to wheel velocity signal capturing circuit, and received current pulse is converted into voltage impulse.C1 position input filter capacitor, T is Transient Suppression Diode, and amplifier output voltage, amplifies input voltage, and the level after amplification is carried out shaping by 74HC14, becomes the acceptable impulse singla of micro controller system, sends into the input capture port of micro controller system.
In the present embodiment, rely on CAN communication between each control system of electronlmobil, entire car controller is one of them very important node unit.Two CAN210B bus controller modules (TouCAN) due to MPC555 Embedded, so the CAN of entire car controller does not need to add the outer CAN controller of sheet, circuit layout is comparatively simple.CAN communication interface adopts the PCA82C250 of Philips.As CAN transceiver, this chip is applicable to the high-speed applications (up to 1Mbaud) in automobile, can provide different transmittabilities to bus and provide different receiving capabilities to CAN controller, it meets CAN210 standard, completely compatible with " ISO11898 " standard.PCA82C250 can bear issuable high transient voltage in automotive environment, and have bus protection transition, the function such as short-circuit protection, Thermal protection to battery and ground, anti-electromagnetic interference capability is strong, is the chip aiming at vehicle electronics Environment Design.
In order to protection system circuit, improve antijamming capability, between MCU and CAN transceiver, have employed high-speed light every device 4N25, the impact of CAN network on system can be eliminated.
In the present embodiment, in vehicle electronics environment, entire car controller can face from many-sided interference, comprise the ringing pulse voltage, electromagnetic wave signal transmitting etc. of power supply noise, the generation of various power actuators, this can produce very adverse influence to the reliability of system.In order to improve functional reliability and the durability of control system, just must take appropriate measures to improve its antijamming capability in the Hardware Design stage.Electromagnetic compatibility has become the problem more and more obtaining in Auto Electronic Controlled System design paying attention to.Entire car controller hardware system has done comprehensive consideration to electromagnetic compatibility, takes corresponding interference protection measure at different design phases.
(1) design safety failure-free power management module
The use of intelligent power chip, and the measure such as anti-reverse, voltage stabilizing, capacitor filtering and decoupling zero effectively can suppress outside electromagnetic interference, improves power supply reliability.
(2) signal condition is carried out
By circuit such as RC filtering, capacitor filtering, stabilivolt voltage stabilizings, filtering and voltage stabilizing conditioning are carried out to the I/O signal of turnover entire car controller, filtered signal noise.
(3) IC chip power supply decoupling zero
To integrated circuit, between the VDD-to-VSS pin of chip, connect Large Copacity tantalum electric capacity and low capacity non-electrolytic capacitor, removing input power coupled noise, reduce interference.
(4) reasonably PCB layout and module isolation
The mutual independence of the circuit modules such as analogous circuit, digital circuit and high-power drive circuit is also isolated, and avoids mutual interference; The PCB design of entire car controller adopts 6 layers of mask-making technology, leaves independently power plane and ground level; And according to different VDD-to-VSS types, power plane and ground level are split, adopt multipoint earth.After taking above measure, entire car controller hardware cell obtains good obstacle overcome ability, by meeting the electromagnetic compatibility detection experiment of GB/T17619-1998 standard.
According to above-described embodiment, just the present invention can be realized well.What deserves to be explained is; under prerequisite based on said structure design, for solving same technical matters, even if some making on the invention are without substantial change or polishing; the essence of the technical scheme adopted is still the same with the present invention, therefore it also should in protection scope of the present invention.
Claims (8)
1. one kind is applicable to the novel entire car controller of pure electric automobile, it is characterized in that, comprise power supply, main MCU, auxiliary MCU, first signal processing circuit, secondary signal treatment circuit, communication module, power driving circuit, the mouth of the first signal processing circuit is connected with the input end of main MCU, communication module, power driving circuit is connected with the mouth of main MCU simultaneously, assist MCU to be connected with main MCU and realize two way communication, secondary signal treatment circuit is connected with the input end of auxiliary MCU, the mouth of auxiliary MCU is also connected with the input end of power driving circuit and communication module,
Operationally, main MCU collection signal also carries out computing, then exports corresponding control command to controlled mechanism, the heartbeat signal of the auxiliary main MCU of MCU Real-time Collection; When main MCU breaks down, performed the collection control process of main MCU by auxiliary MCU.
2. a kind of novel entire car controller being applicable to pure electric automobile according to claim 1, it is characterized in that, described first signal processing circuit and secondary signal treatment circuit include the modulate circuit for the treatment of analog signal and the voltage conversion circuit for the treatment of digital signal, and power driving circuit comprises outputting analog signal, digital signal, the D/A converting circuit of digital signal, low-power drive circuit, superpower driving circuit respectively.
3. a kind of novel entire car controller being applicable to pure electric automobile according to claim 1 and 2, is characterized in that, described communication module adopts CAN to communicate.
4. a kind of novel entire car controller being applicable to pure electric automobile according to claim 3, is characterized in that, described main MCU, auxiliary adopts high-speed light every device 4N25 between MCU and CAN transceiver.
5. a kind of novel entire car controller being applicable to pure electric automobile according to claim 1 and 2, it is characterized in that, described main MCU has selected micro controller system MPC5634, and auxiliary MCU selects micro controller system MC9S12XEP100.
6. a kind of novel entire car controller being applicable to pure electric automobile according to claim 1 and 2, is characterized in that, power driving circuit adopts the smart power switch chip TLE6220GP of 4 passages.
7. a kind of novel entire car controller being applicable to pure electric automobile according to claim 4, it is characterized in that, when described main MCU breaks down, auxiliary MCU collection signal, close the CAN transceiver of main MCU, and the communication undertaken by CAN and each node of car load CAN network under safe condition, and replace main MCU and go the car load of drived control relay to run.
8. a kind of novel entire car controller being applicable to pure electric automobile according to claim 1 and 2, it is characterized in that, described power supply is converted to voltage needed for entire car controller by the power supply of electronlmobil through power management module, and this power management module comprises 24V and turns 5V and 5V and turn 3.3V two circuit.
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