A kind of electric automobile overspeed protection method
Technical field
The present invention relates to electric automobile security technology area, particularly a kind of electric automobile overspeed protection method.
Background technology
The electric automobile that prior art provides, at descending or when wind speed is excessive with the wind, actual speed during acceleration
Can exceed the speed being actually needed, cause driving danger, prior art there is presently no the method for effective regulation speed.
Summary of the invention
For solving above-mentioned technical problem, the invention provides a kind of electric automobile overspeed protection method, it includes following step
Rapid:
S1: gather gas pedal aperture and be converted to throttle analogue signal send to entire car controller, described full-vehicle control
Described throttle analogue signal is sent to throttle explanation module by device, exports throttle torque requests by described throttle explanation module
T2;
S2: Negotiation speed sensor acquisition motor speed to obtain motor after Jie low-pass filtering module LPF real-time
Speed speed, target setting speed is overspeed protection threshold value max_speed, and described overspeed protection threshold value max_speed is with in real time
Speed speed does after the recovery through the 3rd actuator PI3 output protection torque T1;
Whether S4: described torque arbitration module judges to protect torque request T1 less than 0, will protect torque if less than 0
T1 and throttle torque requests T2 sum are assigned to motor torque request T*, described throttle torque requests T2 are composed if greater than 0
Value is to described motor torque request T*;
S5: if torque capacity Tmax that the motor torque request T* obtained in step S4 allows more than motor, restricted T *=
Tmax, does not limits;
S6: described torque request T* obtained in step S5 is inputted the torque capacity current ratio MTPA to electric machine controller
Module, described torque capacity current ratio MTPA module is according to quadrature axis inductance lq, d-axis inductance ld and the motor permanent-magnet magnetic of motor
Described torque request T* is converted to quadrature axis current iq*, the request of direct-axis current id* by chain fai;
S7: while carrying out step S6, gathers the A phase current ia and B phase current ib of motor, processes through standardization
Quadrature axis current iq and direct-axis current id obtaining reality is processed through Clarke inverse transformation and Parker's inverse transformation vector;
S8: regulate through quadrature axis current after the iq obtained in the iq* obtained in step S6 and step S7 is sent into adder
Device PI2 obtains quadrature axis level pressure uq*;The id obtained in the id* obtained in step S6 and step S7 is sent into warp after adder simultaneously
Cross direct-axis current actuator PI3 and obtain d-axis level pressure ud*;
S9: the quadrature-axis voltage uq* that step S8 is obtained and direct-axis voltage ud* send into space vector of voltage impulse modulation obtain
Each the on off state of power switch pipe, eventually passes inverter circuit and completes the driving to motor.
The method have the advantages that
The electric automobile overspeed protection method that the present invention provides can effectively prevent electric automobile during accelerating
The phenomenon of hypervelocity occurs.
Certainly, the arbitrary product implementing the present invention it is not absolutely required to reach all the above advantage simultaneously.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of the embodiment of the present invention, embodiment will be described required use below
Accompanying drawing is briefly described, it should be apparent that, the accompanying drawing in describing below is only some embodiments of the present invention, for ability
From the point of view of the those of ordinary skill of territory, on the premise of not paying creative work, it is also possible to obtain the attached of other according to these accompanying drawings
Figure.
The overspeed protection system schematic diagram that Fig. 1 provides for the embodiment of the present invention;
The work process schematic diagram of the torque arbitration module that Fig. 2 provides for the embodiment of the present invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out clear, complete
Describe, it is clear that described embodiment is only a part of embodiment of the present invention rather than whole embodiments wholely.Based on
Embodiment in the present invention, those of ordinary skill in the art obtained under not making creative work premise all other
Embodiment, broadly falls into the scope of protection of the invention.
The invention provides a kind of electric automobile overspeed protection method, be specifically based on overspeed protection system as shown in Figure 1,
It comprises the following steps:
S1: gather gas pedal aperture and be converted to throttle analogue signal send to entire car controller, described full-vehicle control
Described throttle analogue signal is sent to throttle explanation module by device, exports throttle torque requests by described throttle explanation module
T2;
S2: Negotiation speed sensor acquisition motor speed to obtain motor after Jie low-pass filtering module LPF real-time
Speed speed, target setting speed is overspeed protection threshold value max_speed, and described overspeed protection threshold value max_speed is with in real time
Speed speed does after the recovery through the 3rd actuator PI3 output protection torque T1;
S4: as in figure 2 it is shown, described torque arbitration module judges to protect whether torque request T1 is less than 0, if less than 0
Protection torque T1 is assigned to motor torque request T* with throttle torque requests T2 sum, if greater than 0, described throttle is turned
Square request T2 is assigned to described motor torque request T*;
S5: if torque capacity Tmax that the motor torque request T* obtained in step S4 allows more than motor, restricted T *=
Tmax, does not limits;
S6: described torque request T* obtained in step S5 is inputted the torque capacity current ratio MTPA to electric machine controller
Module, described torque capacity current ratio MTPA module is according to quadrature axis inductance lq, d-axis inductance ld and the motor permanent-magnet magnetic of motor
Described torque request T* is converted to quadrature axis current iq*, the request of direct-axis current id* by chain fai;
S7: while carrying out step S6, gathers the A phase current ia and B phase current ib of motor, processes through standardization
Quadrature axis current iq and direct-axis current id obtaining reality is processed through Clarke inverse transformation and Parker's inverse transformation vector;
S8: regulate through quadrature axis current after the iq obtained in the iq* obtained in step S6 and step S7 is sent into adder
Device PI2 obtains quadrature axis level pressure uq*;The id obtained in the id* obtained in step S6 and step S7 is sent into warp after adder simultaneously
Cross direct-axis current actuator PI3 and obtain d-axis level pressure ud*;
S9: the quadrature-axis voltage uq* that step S8 is obtained and direct-axis voltage ud* send into space vector of voltage impulse modulation obtain
Each the on off state of power switch pipe, eventually passes inverter circuit and completes the driving to motor.
The electric automobile overspeed protection method that the present invention provides can effectively prevent electric automobile during accelerating
The phenomenon of hypervelocity occurs.
Present invention disclosed above preferred embodiment is only intended to help to illustrate the present invention.Preferred embodiment is the most detailed
Describe all of details, be also not intended to the detailed description of the invention that this invention is only described.Obviously, according to the content of this specification,
Can make many modifications and variations.These embodiments are chosen and specifically described to this specification, is to preferably explain the present invention
Principle and actual application so that skilled artisan can be best understood by and utilize the present invention.The present invention is only
Limited by claims and four corner thereof and equivalent.