CN117207787A - Electric drive system ramp auxiliary parking strategy based on brake pedal opening sensor - Google Patents
Electric drive system ramp auxiliary parking strategy based on brake pedal opening sensor Download PDFInfo
- Publication number
- CN117207787A CN117207787A CN202311374529.5A CN202311374529A CN117207787A CN 117207787 A CN117207787 A CN 117207787A CN 202311374529 A CN202311374529 A CN 202311374529A CN 117207787 A CN117207787 A CN 117207787A
- Authority
- CN
- China
- Prior art keywords
- brake pedal
- opening
- vehicle
- mcu
- ramp
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000004364 calculation method Methods 0.000 claims description 21
- 230000036316 preload Effects 0.000 claims description 15
- 230000003993 interaction Effects 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 4
- 230000000994 depressogenic effect Effects 0.000 claims description 3
- 230000000737 periodic effect Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 claims description 3
- 238000011161 development Methods 0.000 abstract description 2
- 238000005265 energy consumption Methods 0.000 abstract 1
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000011217 control strategy Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
Classifications
-
- 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
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/72—Electric energy management in electromobility
Abstract
The invention discloses an electric drive system ramp auxiliary parking strategy based on a brake pedal opening sensor, which is characterized in that the new energy automobile comprises an electric drive system and a whole automobile controller, wherein the ramp sensor and the brake pedal sensor are specifically included so as to achieve the purposes of releasing feet of a driver and saving battery energy to prolong endurance. The electric driving system can fully combine different opening degrees and gradients of the brake pedal to carry out closed-loop self-adaptive adjustment on the rotating speed, so that the vehicle can stably park in the ramp. The technical scheme can improve the effective control of the motor, save unnecessary battery energy consumption and reduce the development cost of the whole vehicle.
Description
Technical Field
The invention mainly relates to the technical field of new energy automobiles, in particular to an electric drive system ramp auxiliary parking strategy based on a brake pedal opening sensor.
Background
With the continuous development of the current new energy automobile technology, many researches are already carried out in the field of the ramp parking of the new energy automobile. Many researches only put forward a motor torque and power control model and a vehicle speed and current double closed-loop control model respectively from the perspective of a motor, and the methods mainly focus on the output characteristics and the control strategy of the motor, but do not fully consider the influence of the performance of a vehicle during the parking of a ramp. Other studies have proposed schemes for controlling motor speed using a bias-driven PI algorithm. The scheme dynamically adjusts motor control parameters by monitoring the deviation between the motor rotation speed and the current, so as to realize the control of the parking performance of the vehicle ramp, but the scheme does not consider the problem of saving the battery energy. In addition, several different hill-start assist systems have been designed for the vehicle hill-stop problem. These auxiliary systems avoid the occurrence of a roll phenomenon by adding braking force to the rear of the vehicle or taking other measures. However, these auxiliary systems are costly to design and implement, limiting their deployment in practical applications.
Disclosure of Invention
1. Technical problem to be solved by the invention
The invention provides a ramp auxiliary parking strategy of an electric drive system based on a brake pedal opening sensor, which is used for solving the aims of releasing feet of a driver and saving battery energy to prolong the endurance, and realizing the closed-loop self-adaptive adjustment of the rotating speed by the electric drive system by fully combining different brake pedal openings and gradients, so that the vehicle can be parked stably in a ramp.
2. Technical proposal
In order to achieve the above-mentioned purpose, the embodiment of the present invention provides a hill-hold strategy for an electric drive system based on a brake pedal opening sensor, which is characterized in that the new energy automobile should include an electric drive system and a vehicle controller, a hill sensor, and a brake pedal sensor, and the specific steps are as follows:
s1: the method comprises the steps that a Motor Controller (MCU) and a whole Vehicle Controller (VCU) in an electric drive system in a slope where a new energy vehicle runs to different gradients CAN perform periodic CAN information interaction through a CAN network, wherein the interaction information comprises information such as slope gradient (SP) which is sent by the VCU in charge, brake pedal opening (PP) and vehicle gear information, preloaded Torque (PT) and zero rotation speed zone bit; the MCU is responsible for sending information such as rotating speed, torque, electric drive fault state and the like;
s2: when the new energy vehicle runs on the ramp and the driver presses a brake pedal and then the vehicle keeps stationary in the ramp, the VCU judges whether the vehicle accords with the auxiliary parking function of the ramp or not according to the vehicle state and the interaction information with the MCU, and if so, the VCU sends corresponding preloading target torque to the MCU according to gradient information acquired by a ramp sensor;
s3: then, after receiving zero rotation speed zone bit and vehicle gear information sent by the VCU, the MCU calculates the torque required to be balanced in the ramp of the vehicle according to the preloading target torque sent by the VCU and the related information of the opening degree of a brake pedal and the gradient of the ramp;
s4: after the driver releases the brake pedal, the electric drive system performs closed-loop self-adaptive adjustment of the rotating speed in the ramp according to the calculated output torque so as to ensure that the vehicle can be braked and stopped in the ramp without the help of other external forces.
Preferentially, in step S3, the electric drive system establishes a hill-hold torque calculation model of the vehicle based on the brake pedal opening according to the preload target torque sent by the VCU and the brake pedal opening and hill gradient related information, wherein the specific processing method is as follows:
s3-1, firstly dividing and segmenting the opening position of the brake pedal of the vehicle by four thresholds, and assuming that the opening of the brake pedal fully depressed by a driver is P, the four thresholds of the opening position division of the brake pedal of the vehicle are 25% P, 50% P, 75% P and P respectively. When a driver steps on a brake pedal to stop the vehicle in a slope, the MCU receives information such as zero rotation speed enabling zone bit, preloaded torque PT, brake pedal opening PP and the like sent by the VCU, and different torque output calculation models are built by the MCU according to different brake pedal opening.
S3-2, when the opening of the brake pedal received by the MCU is more than 0 and less than or equal to 25% P and the pre-load torque transmitted by the VCU is PT, the torque output T calculation model established by the MCU according to the opening of the brake pedal in the interval is:
T＝t 1 *PT(0.7≤t 1 <0.8)
s3-3, when the opening of the brake pedal received by the MCU is more than 25% P and less than or equal to 50% P, and when the pre-load torque sent by the VCU is PT, the torque output T calculation model established by the MCU according to the opening of the brake pedal in the interval is:
T＝t 2 *PT(0.8≤t 2 <0.9)
s3-4, when the opening of the brake pedal received by the MCU is more than 50% P and less than or equal to 75% P, and when the pre-load torque sent by the VCU is PT, the torque output T calculation model established by the MCU according to the opening of the brake pedal in the interval is:
T＝t 3 *PT(0.9≤t 3 <1.0)
s3-4, when the opening of the brake pedal received by the MCU is more than 75% P and less than or equal to P, and the pre-load torque transmitted by the VCU is PT, the torque output T calculation model established by the MCU according to the opening of the brake pedal in the interval is:
T＝t 4 *PT(1.0≤t 4 <1.1)
preferably, t in the calculation model of the hill-hold torque based on the opening degree of the brake pedal described in step 3 1 、t 2 、t 3 、t 4 And joint debugging marking determination can be carried out in the actual vehicle testing stage according to different vehicle types.
3. Advantageous effects
Compared with the prior art, the technical scheme provided by the invention has the following beneficial effects:
1. the invention provides an electric drive system ramp auxiliary parking strategy based on a brake pedal opening sensor, which automatically adjusts motor control parameters according to the operation intention of a driver and the state of a vehicle by monitoring the brake pedal opening in real time, so as to optimize the parking performance of the vehicle ramp and save the consumption of battery energy.
2. The invention has higher practical value and lower cost, and is beneficial to solving the problems and improvement scheme in the prior new energy automobile ramp parking control.
Drawings
Fig. 1 is a flowchart illustrating an electric drive system hill-hold parking strategy based on a brake pedal opening sensor in accordance with the present invention.
Detailed Description
In order that the invention may be readily understood, a more particular description of the invention will be rendered by reference to specific embodiments thereof which are illustrated in the appended drawings, in which, however, the invention may be embodied in many different forms and are not limited to the embodiments described herein, but are instead provided for the purpose of providing a more thorough and complete disclosure of the invention.
In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "page", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings are merely for convenience in describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present invention, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
In the present invention, unless explicitly stated and limited otherwise, the terms "mounted," "connected," "secured," "provided," and the like are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
Examples
Referring to fig. 1, fig. 1 is a flowchart illustrating an electric drive system hill-hold parking strategy based on a brake pedal opening sensor of the present invention, which, as shown in fig. 1, includes:
s1: the method comprises the steps that a Motor Controller (MCU) and a whole Vehicle Controller (VCU) in an electric drive system in a slope where a new energy vehicle runs to different gradients CAN perform periodic CAN information interaction through a CAN network, wherein the interaction information comprises information such as slope gradient (SP) which is sent by the VCU in charge, brake pedal opening (PP) and vehicle gear information, preloaded Torque (PT) and zero rotation speed zone bit; the MCU is responsible for sending information such as rotating speed, torque, electric drive fault state and the like;
s2: when the new energy vehicle runs on the ramp and the driver presses a brake pedal and then the vehicle keeps stationary in the ramp, the VCU judges whether the vehicle accords with the auxiliary parking function of the ramp or not according to the vehicle state and the interaction information with the MCU, and if so, the VCU sends corresponding preloading target torque to the MCU according to gradient information acquired by a ramp sensor;
s3: then, after receiving zero rotation speed zone bit and vehicle gear information sent by the VCU, the MCU calculates the torque required to be balanced in the ramp of the vehicle according to the preloading target torque sent by the VCU and the related information of the opening degree of a brake pedal and the gradient of the ramp;
s4: after the driver releases the brake pedal, the electric drive system performs closed-loop self-adaptive adjustment of the rotating speed in the ramp according to the calculated output torque so as to ensure that the vehicle can be braked and stopped in the ramp without the help of other external forces.
In step S3, a hill-hold torque calculation model of the vehicle based on the brake pedal opening is established according to the electric drive system according to the preload target torque sent by the VCU and the brake pedal opening and the hill gradient related information, wherein the specific steps are as follows:
s3-1, firstly dividing and segmenting the opening position of the brake pedal of the vehicle by four thresholds, and assuming that the opening of the brake pedal fully depressed by a driver is P, the four thresholds of the opening position division of the brake pedal of the vehicle are 25% P, 50% P, 75% P and P respectively. When a driver steps on a brake pedal to stop the vehicle in a slope, the MCU receives information such as zero rotation speed enabling zone bit, preloaded torque PT, brake pedal opening PP and the like sent by the VCU, and different torque output calculation models are built by the MCU according to different brake pedal opening.
S3-2, when the opening of the brake pedal received by the MCU is more than 0 and less than or equal to 25% P and the pre-load torque transmitted by the VCU is PT, the torque output T calculation model established by the MCU according to the opening of the brake pedal in the interval is:
T＝t 1 *PT(0.7≤t 1 <0.8)
s3-3, when the opening of the brake pedal received by the MCU is more than 25% P and less than or equal to 50% P, and when the pre-load torque sent by the VCU is PT, the torque output T calculation model established by the MCU according to the opening of the brake pedal in the interval is:
T＝t 2 *PT(0.8≤t 2 <0.9)
s3-4, when the opening of the brake pedal received by the MCU is more than 50% P and less than or equal to 75% P, and when the pre-load torque sent by the VCU is PT, the torque output T calculation model established by the MCU according to the opening of the brake pedal in the interval is:
T＝t 3 *PT(0.9≤t 3 <1.0)
s3-4, when the opening of the brake pedal received by the MCU is more than 75% P and less than or equal to P, and the pre-load torque transmitted by the VCU is PT, the torque output T calculation model established by the MCU according to the opening of the brake pedal in the interval is:
T＝t 4 *PT(1.0≤t 4 <1.1)
the above-mentioned electric drive system hill-hold assist parking strategy based on the brake pedal opening sensor is characterized in that t in the above-mentioned hill-hold torque calculation model based on the brake pedal opening 1 、t 2 、t 3 、t 4 And joint debugging marking determination can be carried out in the actual vehicle testing stage according to different vehicle types.
The foregoing examples merely illustrate certain embodiments of the invention and are described in more detail and are not to be construed as limiting the scope of the invention; it should be noted that it is possible for a person skilled in the art to make several variants and modifications without departing from the concept of the invention, all of which fall within the scope of protection of the invention; accordingly, the scope of protection of the present invention is to be determined by the appended claims.
Claims (3)
1. The electric drive system ramp auxiliary parking strategy based on the brake pedal opening sensor is characterized in that the new energy automobile comprises an electric drive system and a whole vehicle controller, wherein the ramp sensor and the brake pedal sensor comprise the following specific contents:
s1: the method comprises the steps that a Motor Controller (MCU) and a whole Vehicle Controller (VCU) in an electric drive system in a slope where a new energy vehicle runs to different gradients CAN perform periodic CAN information interaction through a CAN network, wherein the interaction information comprises information such as slope gradient (SP) which is sent by the VCU in charge, brake pedal opening (PP) and vehicle gear information, preloaded Torque (PT) and zero rotation speed zone bit; the MCU is responsible for sending information such as rotating speed, torque, electric drive fault state and the like;
s2: when the new energy vehicle runs on the ramp and the driver presses a brake pedal and then the vehicle keeps stationary in the ramp, the VCU judges whether the vehicle accords with the auxiliary parking function of the ramp or not according to the vehicle state and the interaction information with the MCU, and if so, the VCU sends corresponding preloading target torque to the MCU according to gradient information acquired by a ramp sensor;
s3: then, after receiving zero rotation speed zone bit and vehicle gear information sent by the VCU, the MCU calculates the torque required to be balanced in the ramp of the vehicle according to the preloading target torque sent by the VCU and the related information of the opening degree of a brake pedal and the gradient of the ramp;
s4: after the driver releases the brake pedal, the electric drive system performs closed-loop self-adaptive adjustment of the rotating speed in the ramp according to the calculated output torque so as to ensure that the vehicle can be braked and stopped in the ramp without the help of other external forces.
2. The hill-hold assist parking strategy of the electric drive system based on the brake pedal opening sensor according to claim 1, wherein in the step S3, the electric drive system establishes a hill-hold torque calculation model of the vehicle based on the brake pedal opening according to the preload target torque transmitted by the VCU and the brake pedal opening and the hill gradient related information, wherein the specific steps are as follows:
s3-1, firstly dividing and segmenting the opening position of the brake pedal of the vehicle by four thresholds, and assuming that the opening of the brake pedal fully depressed by a driver is P, the four thresholds of the opening position division of the brake pedal of the vehicle are 25% P, 50% P, 75% P and P respectively. When a driver steps on a brake pedal to stop the vehicle in a slope, the MCU receives information such as zero rotation speed enabling zone bit, preloaded torque PT, brake pedal opening PP and the like sent by the VCU, and different torque output calculation models are built by the MCU according to different brake pedal opening.
S3-2, when the opening of the brake pedal received by the MCU is more than 0 and less than or equal to 25% P and the pre-load torque transmitted by the VCU is PT, the torque output T calculation model established by the MCU according to the opening of the brake pedal in the interval is:
T＝t 1 *PT(0.7≤t 1 <0.8)
s3-3, when the opening of the brake pedal received by the MCU is more than 25% P and less than or equal to 50% P, and when the pre-load torque sent by the VCU is PT, the torque output T calculation model established by the MCU according to the opening of the brake pedal in the interval is:
T＝t 2 *PT(0.8≤t 2 <0.9)
s3-4, when the opening of the brake pedal received by the MCU is more than 50% P and less than or equal to 75% P, and when the pre-load torque sent by the VCU is PT, the torque output T calculation model established by the MCU according to the opening of the brake pedal in the interval is:
T＝t 3 *PT(0.9≤t 3 <1.0)
s3-4, when the opening of the brake pedal received by the MCU is more than 75% P and less than or equal to P, and the pre-load torque transmitted by the VCU is PT, the torque output T calculation model established by the MCU according to the opening of the brake pedal in the interval is:
T＝t 4 *PT(1.0≤t 4 <1.1)。
3. the brake pedal opening sensor-based hill-hold parking strategy for an electric drive system according to claim 2, wherein t is calculated in the brake pedal opening-based hill-hold torque calculation model 1 、t 2 、t 3 、t 4 And joint debugging marking determination can be carried out in the actual vehicle testing stage according to different vehicle types.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311374529.5A CN117207787A (en) | 2023-10-23 | 2023-10-23 | Electric drive system ramp auxiliary parking strategy based on brake pedal opening sensor |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311374529.5A CN117207787A (en) | 2023-10-23 | 2023-10-23 | Electric drive system ramp auxiliary parking strategy based on brake pedal opening sensor |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117207787A true CN117207787A (en) | 2023-12-12 |
Family
ID=89040849
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311374529.5A Pending CN117207787A (en) | 2023-10-23 | 2023-10-23 | Electric drive system ramp auxiliary parking strategy based on brake pedal opening sensor |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117207787A (en) |
-
2023
- 2023-10-23 CN CN202311374529.5A patent/CN117207787A/en active Pending
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| EP4015280A1 (en) | Energy recovery control method and device, controller, and electric car | |
| KR100820489B1 (en) | Compensation method for amount of regenerative braking when regenerative braking of vehicle is out of order | |
| CN104118329B (en) | A kind of Recovering Waste Energy of Braking in Automobiles control system and control method thereof | |
| CN107415704B (en) | Composite braking method and device and adaptive cruise controller | |
| CN102700419B (en) | Parallel-type braking energy recovery system and control method thereof | |
| EP2505423B1 (en) | Electric vehicle | |
| JP2005253126A (en) | Brake controller of hybrid vehicle and vehicle mounting that controller | |
| CN102407785A (en) | Apparatus for controlling motor torque | |
| US9199544B2 (en) | Method of controlling electric vehicle | |
| JP6153857B2 (en) | Braking device for vehicle | |
| CN109968990B (en) | Regenerative braking control method and device | |
| CN107599889A (en) | One kind reversing control method, device and electric automobile | |
| CN105946856A (en) | Self-adaptive slipping control method of pure electrically driven automobile | |
| CN115583154A (en) | Intelligent marshalling truck hybrid driving system and method based on trailer self-sensing | |
| CN208376535U (en) | Regenerative brake control system | |
| CN112918443B (en) | Brake control method, device, equipment and storage medium | |
| CN112874525A (en) | Crawling method and device for electric automobile and vehicle | |
| CN117207787A (en) | Electric drive system ramp auxiliary parking strategy based on brake pedal opening sensor | |
| CN112389393B (en) | Brake system, control method and device thereof, storage medium and controller | |
| CN111674263A (en) | Auxiliary braking method and system for vehicle | |
| CN114312347B (en) | Trailer auxiliary driving method and system | |
| KR101500348B1 (en) | Method for brake controlling of hybrid vehicle | |
| CN112959894B (en) | Vehicle energy-saving control method and device, storage medium and computer equipment | |
| KR100897114B1 (en) | Torque control method in brake operation of electric vehicle | |
| KR20070062230A (en) | A method for increasing regeneration energy of hybrid vehicle |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |