CN115709704A - Electric automobile brake optimization system and method capable of fully utilizing ground adhesion - Google Patents
Electric automobile brake optimization system and method capable of fully utilizing ground adhesion Download PDFInfo
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- CN115709704A CN115709704A CN202211470333.1A CN202211470333A CN115709704A CN 115709704 A CN115709704 A CN 115709704A CN 202211470333 A CN202211470333 A CN 202211470333A CN 115709704 A CN115709704 A CN 115709704A
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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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- Y02T10/72—Electric energy management in electromobility
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Abstract
The invention provides an electric automobile brake optimization system and method which fully utilize the ground adhesive force, comprising an accelerator/brake pedal; a vehicle control unit; a motor controller; a drive motor; a brake disc; the hydraulic braking mechanism is used for applying hydraulic oil with different clamping forces to the brake disc; the brake locking system controls the hydraulic brake mechanism to realize locking brake; the electronic braking system controls the distribution of the hydraulic braking force of the hydraulic braking mechanism to the front wheel brake disc and the rear wheel brake disc before the brake locking system is started; and the chassis domain controller receives the braking parameters fed back by the anti-lock braking system and the electronic braking system and feeds back the braking requirement to the vehicle control unit. The invention increases the maximum braking force for the rear wheel by controlling the driving motor, so that the wheels fully utilize the ground adhesion and solve the problem of braking force utilization rate.
Description
Technical Field
The invention relates to the technical field of electric automobile braking, in particular to an electric automobile braking optimization system and method capable of fully utilizing ground adhesion.
Background
When a driver steps on a brake pedal in the running process of the electric automobile, wheels are gradually decelerated by hydraulic braking or motor braking. During braking, due to inertia, the load of the automobile moves forwards, the deformation of the rear wheels and the pressure on the ground are gradually reduced, so that the rolling friction force of the ground on the rear wheels is correspondingly reduced, if the braking force of the rear wheels is not adjusted, the rear wheels are locked in advance, and the tail flicking or sideslip phenomenon of the automobile occurs;
although an electronic braking auxiliary system is arranged in an electric automobile to adjust the braking force of front and rear wheels at present, the adjustment result is shown as the traditional power distribution curves of the front and rear wheels in fig. 2 and fig. 3, the traditional power distribution curves of the front and rear wheels and the ideal power distribution curves of the front and rear wheels have large differences in the initial stage and the later stage, the hydraulic braking force applied to the wheels is smaller than the maximum adhesive force provided by the ground, the ground adhesive force loss exists, and the ground adhesive force utilization rate is not high.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides the electric automobile braking optimization system which fully utilizes the ground adhesion, and solves the problems mentioned in the background technology.
In order to realize the purpose, the invention is realized by the following technical scheme:
electric automobile braking optimization system of make full use of ground adhesive force includes:
an accelerator/brake pedal;
the vehicle control unit receives the pedal signal to judge the driving intention;
the motor controller receives an instruction of the vehicle control unit and controls the working state of the driving motor;
the driving motor is mechanically connected with the wheels and provides driving force and electric braking force for the whole vehicle;
the brake disc is mechanically connected with the wheel and realizes braking through the friction force between the wheel and the brake disc;
the hydraulic braking mechanism is used for applying hydraulic oil with different clamping forces to the brake disc;
the brake locking system controls the hydraulic brake mechanism to realize locking brake;
the electronic braking system controls the distribution of the hydraulic braking force of the hydraulic braking mechanism to the front wheel brake disc and the rear wheel brake disc before the brake locking system is started;
and the chassis domain controller receives the braking parameters fed back by the anti-lock braking system and the electronic braking system and feeds back the braking requirement to the vehicle control unit.
Furthermore, a real-time front and rear wheel power distribution curve drawing module, a front and rear wheel power distribution curve comparison module, a motor optimization module and a hydraulic optimization module are arranged in the vehicle control unit;
the real-time front and rear wheel power distribution curve drawing module is used for inputting the received front and rear axle braking force parameters into a drawing unit and drawing a real-time front and rear wheel power distribution curve through the drawing unit, an ideal front and rear wheel power distribution curve is arranged in the drawing unit, and the ideal front and rear wheel power distribution curve and the real-time front and rear wheel power distribution curve coexist;
the front and rear wheel power distribution curve comparison module compares and judges an ideal front and rear wheel power distribution curve with a real-time front and rear wheel power distribution curve; when the ideal front and rear wheel power distribution curve is higher than the real-time front and rear wheel power distribution curve, the hydraulic optimization module is linked to work so that the real-time front and rear wheel power distribution curve is close to the ideal front and rear wheel power distribution curve to the maximum extent; when the ideal front and rear wheel power distribution curve is lower than the real-time front and rear wheel power distribution curve, the linkage motor optimization module works to enable the real-time front and rear wheel power distribution curve to be close to the ideal front and rear wheel power distribution curve to the maximum extent;
the motor optimization module controls the driving motor to increase the braking force of the rear wheel;
and the linkage hydraulic optimization module controls the intermittent action of the hydraulic braking mechanism to control the braking force of the front wheel and the rear wheel to increase.
Further, the ideal front and rear wheel power distribution curves include an empty ideal front and rear wheel power distribution curve and a full ideal front and rear wheel power distribution curve, and the drawing unit selects the empty ideal front and rear wheel power distribution curve or the full ideal front and rear wheel power distribution curve according to the vehicle body weight.
Furthermore, the hydraulic brake mechanism comprises an oil cylinder, a pressure increasing valve, a pressure reducing valve and proportional valves, wherein the output end of the oil cylinder is connected in parallel to the pressure increasing valve or the pressure reducing valve through an oil pipe, the pressure increasing valve or the pressure reducing valve is in communication connection with the chassis domain controller, the output ends of the pressure increasing valve or the pressure reducing valve are communicated with a group of proportional valves, the output ends of the proportional valves are collected through the oil pipe and communicated to the brake disc, and the proportional valves are in communication connection with the chassis domain controller.
Further, the front axle braking force and the rear axle braking force parameters comprise vehicle speed information, hydraulic braking force and vehicle body weight information.
The brake optimization method of the electric automobile fully utilizing the ground adhesion comprises the following steps:
s1, executing a braking action:
the vehicle control unit obtains an electric braking signal;
the vehicle control unit transmits the electric braking signal to the motor controller and the chassis domain controller;
the motor controller controls the driving motor to stop working, so that the wheels stop rotating;
the chassis domain controller controls the electronic auxiliary system to work;
the electronic auxiliary system controls the hydraulic brake mechanism to work and applies braking force to the brake disc;
s2, brake optimization:
the vehicle control unit draws a real-time front and rear wheel power distribution curve according to the front and rear axle braking force parameters;
comparing the real-time front and rear wheel power distribution curve with an ideal front and rear wheel power distribution curve:
if the real-time front and rear wheel power distribution curve is lower than the ideal front and rear wheel power distribution curve, the vehicle control unit calculates an addible space value of the rear wheel braking force, and the motor controller controls the driving motor to increase the braking force on the rear wheel, so that the real-time front and rear wheel power distribution curve is close to the ideal front and rear wheel power distribution curve to the maximum extent;
if the real-time front and rear wheel power distribution curve is higher than the ideal front and rear wheel power distribution curve, the electronic braking system controls the hydraulic braking mechanism to work intermittently, and the braking force of the wheels is controlled to increase, so that the real-time front and rear wheel power distribution curve is close to the ideal front and rear wheel power distribution curve to the maximum extent;
and if the real-time front and rear wheel power distribution curve is intersected with the ideal front and rear wheel power distribution curve, the whole vehicle controller does not respond.
The invention provides an electric automobile brake optimization system which makes full use of ground adhesion. Compared with the prior art, the method has the following beneficial effects:
the real-time front and rear wheel power distribution curve is drawn and compared with an ideal front and rear wheel power distribution curve obtained by a long-term test;
when the ideal front and rear wheel power distribution curve is higher than the real-time front and rear wheel power distribution curve, the hydraulic braking force borne by the wheels is smaller than the maximum adhesive force provided by the ground, the ground adhesive force loss exists, the maximum braking force is increased for the rear wheels by controlling the driving motor, the ground adhesive force is fully utilized by the wheels, and the problem of the braking force utilization rate is solved;
when the ideal front and rear wheel power distribution curve is lower than the real-time front and rear wheel power distribution curve, the hydraulic braking mechanism is controlled to intermittently act, so that the front wheel-rear wheel braking force is controlled to increase, the ground adhesive force is fully utilized, the braking efficiency is optimized, and the excessive locking of the braking force is prevented;
thereby realizing the full utilization of the ground adhesive force in the whole braking process.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram illustrating a brake optimization system of an electric vehicle for fully utilizing ground adhesion according to the present invention;
FIG. 2 is a schematic diagram of the drawing unit drawing state in the unloaded state of the present invention;
FIG. 3 is a schematic diagram of the drawing unit drawing states in a fully loaded state of the present invention;
fig. 4 shows a schematic view of the hydraulic brake system of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention are clearly and completely described, and it is obvious that the described embodiments are a part of the embodiments of the present invention, but 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.
Example one
In order to solve the technical problems in the background art, the following electric automobile brake optimization system which fully utilizes the ground adhesion is provided:
referring to fig. 1-4, the invention provides an electric vehicle braking optimization system, an accelerator/brake pedal, which makes full use of ground adhesion; the vehicle control unit receives the pedal signal to judge the driving intention; the motor controller receives the instruction of the whole vehicle controller and controls the working state of the driving motor; the driving motor is mechanically connected with the wheels and provides driving force and electric braking force for the whole vehicle; the brake disc is mechanically connected with the wheel, and braking is realized through the friction force between the wheel and the brake disc; the hydraulic braking mechanism is used for applying hydraulic oil with different clamping forces to the brake disc; the brake locking system controls the hydraulic brake mechanism to realize locking brake; the electronic braking system controls the distribution of the hydraulic braking force of the hydraulic braking mechanism to the front wheel brake disc and the rear wheel brake disc before the brake locking system is started; and the chassis domain controller receives the braking parameters fed back by the anti-lock braking system and the electronic braking system and feeds back the braking requirement to the vehicle control unit.
In this embodiment, a real-time front and rear wheel power distribution curve drawing module, a front and rear wheel power distribution curve comparison module, a motor optimization module and a hydraulic optimization module are arranged in the vehicle control unit;
the real-time front and rear wheel power distribution curve drawing module is used for inputting the received front and rear axle braking force parameters into a drawing unit and drawing a real-time front and rear wheel power distribution curve through the drawing unit, an ideal front and rear wheel power distribution curve is arranged in the drawing unit, and the ideal front and rear wheel power distribution curve and the real-time front and rear wheel power distribution curve coexist;
the front and rear wheel power distribution curve comparison module compares and judges an ideal front and rear wheel power distribution curve with a real-time front and rear wheel power distribution curve; when the ideal front and rear wheel power distribution curve is higher than the real-time front and rear wheel power distribution curve, the hydraulic optimization module is linked to work so that the real-time front and rear wheel power distribution curve is close to the ideal front and rear wheel power distribution curve to the maximum extent; when the ideal front and rear wheel power distribution curve is lower than the real-time front and rear wheel power distribution curve, the linkage motor optimization module works to enable the real-time front and rear wheel power distribution curve to be close to the ideal front and rear wheel power distribution curve to the maximum extent; the motor optimization module controls the driving motor to increase the braking force of the rear wheel; and the linkage hydraulic optimization module controls the intermittent action of the hydraulic braking mechanism to control the braking force of the front wheel and the rear wheel to increase.
By drawing a real-time front and rear wheel power distribution curve and comparing the real-time front and rear wheel power distribution curve with an ideal front and rear wheel power distribution curve obtained by a long-term test, when the ideal front and rear wheel power distribution curve is higher than the real-time front and rear wheel power distribution curve, controlling a driving motor to increase the maximum braking force for a rear wheel, and when the ideal front and rear wheel power distribution curve is lower than the real-time front and rear wheel power distribution curve, controlling a hydraulic braking mechanism to intermittently act, so that the front wheel-rear wheel braking force is controlled to be increased, the ground adhesive force is fully utilized, the braking efficiency is optimized, and the excessive locking of the braking force is prevented;
by adding the proportional valve, the increase speed of the braking force of the rear wheel can be controlled under the condition that the electronic braking system fails, the rear wheel is prevented from being locked and thrown away too early, and the braking safety of the vehicle is ensured.
In this embodiment, the ideal front and rear wheel power distribution curves include an empty ideal front and rear wheel power distribution curve and a full ideal front and rear wheel power distribution curve, and the drawing unit selects the empty ideal front and rear wheel power distribution curve or the full ideal front and rear wheel power distribution curve according to the vehicle body weight.
According to different wheel loads, different ideal power distribution curves of the front wheels and the rear wheels are matched so as to realize targeted optimization.
In this embodiment, the hydraulic brake mechanism includes an oil cylinder, a pressure increasing valve, a pressure reducing valve, and a proportional valve, an output end of the oil cylinder is connected in parallel to the pressure increasing valve or the pressure reducing valve through an oil pipe, the pressure increasing valve or the pressure reducing valve is in communication connection with the chassis domain controller, an output end of the pressure increasing valve or the pressure reducing valve is communicated with a group of proportional valves, output ends of the proportional valves are collected through oil pipes and communicated to the brake disc, and the proportional valves are in communication connection with the chassis domain controller.
In this embodiment, the front and rear axle braking force parameters include vehicle speed information, hydraulic braking force magnitude, and vehicle body weight information.
Example two
As shown in fig. 1 to 4, on the basis of the above embodiments, the present embodiment further provides the following:
the brake optimization method comprises the following steps:
s1, executing a braking action:
the vehicle control unit obtains an electric braking signal;
the vehicle control unit transmits the electric braking signal to the motor controller and the chassis domain controller;
the motor controller controls the driving motor to stop working, so that the wheels stop rotating;
the chassis domain controller controls the electronic auxiliary system to work;
the electronic auxiliary system controls the hydraulic braking mechanism to work and applies braking force to the brake disc;
s2, brake optimization:
the vehicle control unit draws a real-time front and rear wheel power distribution curve according to the front and rear axle braking force parameters;
comparing the real-time front and rear wheel power distribution curve with an ideal front and rear wheel power distribution curve:
if the real-time front and rear wheel power distribution curve is lower than the ideal front and rear wheel power distribution curve, the vehicle control unit calculates an addible space value of the rear wheel braking force, and the motor controller controls the driving motor to increase the braking force on the rear wheel, so that the real-time front and rear wheel power distribution curve is close to the ideal front and rear wheel power distribution curve to the maximum extent;
if the real-time front and rear wheel power distribution curve is higher than the ideal front and rear wheel power distribution curve, the electronic braking system controls the hydraulic braking mechanism to work intermittently, the braking force of the wheels is controlled to increase, and the real-time front and rear wheel power distribution curve is close to the ideal front and rear wheel power distribution curve to the maximum extent;
and if the real-time front and rear wheel power distribution curve is intersected with the ideal front and rear wheel power distribution curve, the whole vehicle controller does not respond.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising a … …" does not exclude the presence of another identical element in a process, method, article, or apparatus that comprises the element.
The above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (6)
1. Electric automobile braking optimization system of make full use of ground adhesive force, its characterized in that includes:
an accelerator/brake pedal;
the vehicle control unit receives the pedal signal to judge the driving intention;
the motor controller receives the instruction of the whole vehicle controller and controls the working state of the driving motor;
the driving motor is mechanically connected with the wheels and provides driving force and electric braking force for the whole vehicle;
the brake disc is mechanically connected with the wheel and realizes braking through the friction force between the wheel and the brake disc;
the hydraulic braking mechanism is used for applying hydraulic oil with different clamping forces to the brake disc;
the brake locking system controls the hydraulic brake mechanism to realize locking brake;
the electronic braking system controls the distribution of the hydraulic braking force of the hydraulic braking mechanism to the front wheel brake disc and the rear wheel brake disc before the brake locking system is started;
and the chassis domain controller receives the braking parameters fed back by the anti-lock braking system and the electronic braking system and feeds back the braking requirement to the vehicle control unit.
2. The electric vehicle braking optimization system fully utilizing the ground adhesion according to claim 1, wherein a real-time front and rear wheel power distribution curve drawing module, a front and rear wheel power distribution curve comparison module, a motor optimization module and a hydraulic optimization module are arranged in the vehicle control unit;
the real-time front and rear wheel power distribution curve drawing module is used for inputting the received front and rear axle braking force parameters into a drawing unit and drawing a real-time front and rear wheel power distribution curve through the drawing unit, an ideal front and rear wheel power distribution curve is arranged in the drawing unit, and the ideal front and rear wheel power distribution curve and the real-time front and rear wheel power distribution curve coexist;
the front and rear wheel power distribution curve comparison module compares and judges an ideal front and rear wheel power distribution curve with a real-time front and rear wheel power distribution curve; when the ideal front and rear wheel power distribution curve is higher than the real-time front and rear wheel power distribution curve, the hydraulic optimization module is linked to work so that the real-time front and rear wheel power distribution curve is close to the ideal front and rear wheel power distribution curve to the maximum extent; when the ideal front and rear wheel power distribution curve is lower than the real-time front and rear wheel power distribution curve, the linkage motor optimization module works to enable the real-time front and rear wheel power distribution curve to be close to the ideal front and rear wheel power distribution curve to the maximum extent;
the motor optimization module controls the driving motor to increase the braking force of the rear wheel;
and the linkage hydraulic optimization module controls the intermittent action of the hydraulic braking mechanism to control the braking force of the front wheel and the rear wheel to increase.
3. The system of claim 2, wherein the ideal distribution curves of the front and rear wheels include an empty ideal distribution curve of the front and rear wheels and a full ideal distribution curve of the front and rear wheels, and the mapping unit selects the empty ideal distribution curve of the front and rear wheels or the full ideal distribution curve of the front and rear wheels according to the weight of the vehicle body.
4. The system of claim 1, wherein the hydraulic brake mechanism comprises an oil cylinder, a pressure increasing valve, a pressure reducing valve, and a proportional valve, the output end of the oil cylinder is connected in parallel to the pressure increasing valve or the pressure reducing valve through an oil pipe, the pressure increasing valve or the pressure reducing valve is in communication connection with the chassis domain controller, the output end of the pressure increasing valve or the pressure reducing valve is in communication connection with a set of proportional valves, the output ends of the proportional valves are collected through oil pipes and communicated to the brake disc, and the proportional valves are in communication connection with the chassis domain controller.
5. The electric vehicle brake optimization system making full use of the ground adhesion according to claim 1, wherein the front and rear axle brake force parameters comprise vehicle speed information, hydraulic brake force magnitude and vehicle body weight information.
6. The electric automobile brake optimization method fully utilizing the ground adhesion is characterized by comprising the following steps of:
s1, executing a braking action:
the vehicle control unit acquires an electric braking signal;
the vehicle control unit transmits the electric braking signal to the motor controller and the chassis domain controller;
the motor controller controls the driving motor to stop working, so that the wheels stop rotating;
the chassis domain controller controls the electronic auxiliary system to work;
the electronic auxiliary system controls the hydraulic braking mechanism to work and applies braking force to the brake disc;
s2, brake optimization:
the vehicle control unit draws a real-time front and rear wheel power distribution curve according to the front and rear axle braking force parameters;
comparing the real-time front and rear wheel power distribution curve with an ideal front and rear wheel power distribution curve:
if the real-time front and rear wheel power distribution curve is lower than the ideal front and rear wheel power distribution curve, the vehicle control unit calculates an addible space value of the rear wheel braking force, and the motor controller controls the driving motor to increase the braking force on the rear wheel, so that the real-time front and rear wheel power distribution curve is close to the ideal front and rear wheel power distribution curve to the maximum extent;
if the real-time front and rear wheel power distribution curve is higher than the ideal front and rear wheel power distribution curve, the electronic braking system controls the hydraulic braking mechanism to work intermittently, and the braking force of the wheels is controlled to increase, so that the real-time front and rear wheel power distribution curve is close to the ideal front and rear wheel power distribution curve to the maximum extent;
and if the real-time front and rear wheel power distribution curve is intersected with the ideal front and rear wheel power distribution curve, the whole vehicle controller does not respond.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211470333.1A CN115709704A (en) | 2022-11-23 | 2022-11-23 | Electric automobile brake optimization system and method capable of fully utilizing ground adhesion |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211470333.1A CN115709704A (en) | 2022-11-23 | 2022-11-23 | Electric automobile brake optimization system and method capable of fully utilizing ground adhesion |
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| Publication Number | Publication Date |
|---|---|
| CN115709704A true CN115709704A (en) | 2023-02-24 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211470333.1A Pending CN115709704A (en) | 2022-11-23 | 2022-11-23 | Electric automobile brake optimization system and method capable of fully utilizing ground adhesion |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115709704A (en) |
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- 2022-11-23 CN CN202211470333.1A patent/CN115709704A/en active Pending
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Effective date of registration: 20230714 Address after: 201400 Building 5, 936 Guoshun Road, Nanqiao Town, Fengxian District, Shanghai Applicant after: Shanghai Liangzi Technology Co.,Ltd. Address before: Building 24, Beihang Wuhu General Aviation Innovation Park, Anhui Xinwu Economic Development Zone, Wanzai District, Wuhu City, Anhui Province, 241000 Applicant before: Keda Guochuang Polestar (Wuhu) Technology Co.,Ltd. |
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