CN111660823A - Control method based on brake regeneration of hydraulic energy storage system of pure electric truck - Google Patents
Control method based on brake regeneration of hydraulic energy storage system of pure electric truck Download PDFInfo
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- CN111660823A CN111660823A CN202010587418.2A CN202010587418A CN111660823A CN 111660823 A CN111660823 A CN 111660823A CN 202010587418 A CN202010587418 A CN 202010587418A CN 111660823 A CN111660823 A CN 111660823A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 53
- 230000008929 regeneration Effects 0.000 title claims abstract description 41
- 238000011069 regeneration method Methods 0.000 title claims abstract description 41
- 238000000034 method Methods 0.000 title claims abstract description 25
- 238000011084 recovery Methods 0.000 claims abstract description 12
- 239000010720 hydraulic oil Substances 0.000 claims description 14
- 239000003921 oil Substances 0.000 claims description 11
- 230000001172 regenerating effect Effects 0.000 claims description 11
- 230000005484 gravity Effects 0.000 claims description 3
- 238000011217 control strategy Methods 0.000 abstract description 3
- 230000005540 biological transmission Effects 0.000 description 6
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 6
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 5
- 229910001416 lithium ion Inorganic materials 0.000 description 5
- 230000018109 developmental process Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000007717 exclusion Effects 0.000 description 1
- 230000002431 foraging effect Effects 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L7/00—Electrodynamic brake systems for vehicles in general
- B60L7/10—Dynamic electric regenerative braking
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T1/00—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles
- B60T1/02—Arrangements of braking elements, i.e. of those parts where braking effect occurs specially for vehicles acting by retarding wheels
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60T—VEHICLE BRAKE CONTROL SYSTEMS OR PARTS THEREOF; BRAKE CONTROL SYSTEMS OR PARTS THEREOF, IN GENERAL; ARRANGEMENT OF BRAKING ELEMENTS ON VEHICLES IN GENERAL; PORTABLE DEVICES FOR PREVENTING UNWANTED MOVEMENT OF VEHICLES; VEHICLE MODIFICATIONS TO FACILITATE COOLING OF BRAKES
- B60T13/00—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems
- B60T13/10—Transmitting braking action from initiating means to ultimate brake actuator with power assistance or drive; Brake systems incorporating such transmitting means, e.g. air-pressure brake systems with fluid assistance, drive, or release
- B60T13/66—Electrical control in fluid-pressure brake systems
- B60T13/662—Electrical control in fluid-pressure brake systems characterised by specified functions of the control system components
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- Engineering & Computer Science (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Power Engineering (AREA)
- Electric Propulsion And Braking For Vehicles (AREA)
- Regulating Braking Force (AREA)
Abstract
The invention discloses a control method for brake regeneration of a hydraulic energy storage system based on a pure electric truck, which is based on an energy storage device in the hydraulic energy storage regeneration system, provides different brake control strategies aiming at different working conditions of the pure electric truck with the hydraulic energy storage brake energy regeneration system in the brake process, divides the brake process into three different working conditions, namely low-strength deceleration brake, medium-strength deceleration brake and emergency brake, and recycles the brake energy to the maximum extent on the premise of ensuring the brake performance. The pure electric truck brake energy recovery rate of different brake initial speeds and brake strengths can be effectively improved, and the economy of the pure electric truck is improved to a certain extent.
Description
The technical field is as follows:
the invention belongs to the technical field of automobile system control, and particularly relates to a control method based on brake regeneration of a hydraulic energy storage system of a pure electric truck.
Background art:
the development of the electric automobile is one of important ways for relieving energy crisis, reducing environmental pollution and realizing the continuous development of low-carbon environment-friendly economy. The lithium ion battery has the advantages of high specific energy, high specific power, long cycle service life and the like, so that the lithium ion battery becomes a preferred power source of the new energy automobile. However, new energy vehicles running in urban areas are limited by traffic congestion and a large number of traffic lights, so that the vehicles are frequently started, accelerated, braked and decelerated. The large-current discharge of the battery pack when starting and accelerating is a main reason for aging of the lithium ion battery pack; and frequent braking accelerates wear of the friction plates of the brake system. In order to improve the energy utilization efficiency, the hydraulic energy storage braking energy regeneration system of the pure electric truck is developed, and the hydraulic energy storage braking energy regeneration system has important theoretical and engineering application values.
The brake energy recovery system of the Insight hybrid electric vehicle developed by Toyota corporation of Japan coordinates the relationship between the mechanical brake force and the electric brake force by adjusting the brake torque through the motor, so as to recover the brake energy as much as possible, thereby improving the driving range of the whole vehicle. However, the vehicle model has poor braking stability and cannot maximize the energy recovery efficiency.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
The invention content is as follows:
the invention aims to provide a control method based on the brake regeneration of a hydraulic energy storage system of a pure electric truck, which is based on an energy storage device in the hydraulic energy storage regeneration system, provides different brake control strategies aiming at different working conditions of the pure electric truck with the hydraulic energy storage brake energy regeneration system in the brake process, and divides the brake process into three different working conditions, namely low-strength deceleration brake, medium-strength deceleration brake and emergency brake, on the premise of ensuring the brake performance, so that the brake energy is recycled to the maximum extent. The pure electric truck brake energy recovery rate of different brake initial speeds and brake strengths can be effectively improved, so that the economy of the pure electric truck is improved to a certain extent, and the defects in the prior art are overcome.
A hydraulic energy storage braking regenerative energy storage control system of a pure electric truck comprises a hydraulic pump, a hydraulic control system controller, a hydraulic oil tank, a high-pressure energy storage device and an electric motor; when the vehicle brakes, the hydraulic control system controller controls the electric motor and the hydraulic pump to work according to the current pressure of the high-pressure energy accumulator and the braking strength of the whole vehicle, so that oil in the hydraulic oil tank enters the high-pressure energy accumulator to compress gas to achieve the purpose of energy storage.
The electric truck is provided with a hydraulic energy storage braking regeneration system, a motor system, a transmission system and a braking system. The transmission system comprises a drive axle and a gearbox. The control system for the hydraulic energy storage brake regeneration of the pure electric truck is shown in figure 1. The motor of the vehicle rotates to generate driving force, and the driving force is transmitted to wheels through a transmission system to drive the vehicle to run; when a driver performs a braking operation, the vehicle is decelerated by a frictional braking force generated to wheels by a brake system.
In order to achieve the aim, the invention also provides a control method based on the brake regeneration of the hydraulic energy storage system of the pure electric truck, wherein a brake system controller receives a brake request signal through a bus and judges the brake request intention of a driver; the brake system controller calculates the braking force required by the whole vehicleF Z And real-time brake strengthz(ii) a The hydraulic control system is based on the real-time braking strengthzAnd pressure of the high-pressure accumulatorPCalculating the regenerative braking force that the hydraulic brake regeneration system can provideF Y (ii) a Finally, according to different braking strengths of the whole vehiclezAnd high pressure accumulator pressurePDifferent braking energy recovery strategies are selected.
The method takes the vehicle braking strength and the high-voltage energy storage device pressure as the basis for selecting the control strategy, can effectively reduce the working current peak value of the lithium ion battery of the pure electric truck while giving consideration to the braking stability of the pure electric truck, and can improve the braking energy recovery rate of the pure electric truck with different braking initial speeds and braking strengths, thereby improving the economy of the pure electric truck to a certain extent.
Preferably, in the above technical solution, the braking request signal includes an accelerator pedal stroke signal, a brake pedal stroke signal, and a high-pressure accumulator pressurePAnd real-time vehicle speedv。
Preferably, in the above technical solution, the method comprises the following steps:
step 1) a braking system receives a driver braking request;
step 2) the brake system controller receives a brake request signal of a driver through a bus, wherein the brake request signal comprises an accelerator pedal travel signal, a brake pedal travel signal and the pressure of a high-pressure energy accumulatorPAnd real-time vehicle speedv；
Step 3) calculating the braking force required by the whole vehicle by the braking system controllerF Z And real-time brake strengthz；
Step 4) calculating braking force of braking energy regeneration system by using hydraulic control system controllerF Y 。
Step 5) according to different braking strengths of the whole vehiclezAnd high pressure accumulator pressurePDifferent braking energy recovery strategies are selected.
Preferably, in the above technical scheme, the vehicle braking process is divided into three different working conditions, namely low-intensity deceleration braking, medium-intensity deceleration braking and emergency braking, according to the correlation between the vehicle braking intensity and the pressure of the high-pressure accumulator;
under the low-intensity deceleration braking condition, two forms of braking are adopted: regenerative braking and friction braking of the hydraulic energy storage braking system;
under the condition of moderate-intensity deceleration braking, two forms of braking are adopted: hydraulic stored energy braking systems perform regenerative braking and friction braking.
Under the emergency braking condition, friction braking is adopted.
Preferably, in the above technical scheme, step 5) specifically includes selecting the following operating conditions according to the braking strength of the entire vehicle and the pressure of the high-pressure energy accumulator:
step 5.1) emergency braking condition: when real-time braking strengthzWhen the braking force is more than or equal to 0.7, the emergency braking working condition is selected, and the braking force of the whole vehicle is completely provided by the friction braking force, namelyF z =F m (ii) a Wherein,F z the braking force required by the whole vehicle;F m is friction braking force; real time brake strength
Where a is the deceleration at the time of vehicle braking, and g is gravity. For example, the following steps are carried out: when the current braking strength of the vehicle is 0.8, the vehicle is in an emergency braking working condition, and the braking force of the whole vehicle is completely provided by the friction braking force;
step 5.2) medium-intensity braking condition: when the braking strength is more than or equal to 0.4zAnd when the braking force is less than or equal to 0.7, selecting a medium-intensity braking working condition. At the moment, if the pressure value of the high-pressure energy accumulator isPGreater than the rated pressure valueP N When the braking force of the vehicle is provided by friction braking, i.e.F z =F m (ii) a If the pressure value of the high-pressure energy accumulatorPLess than rated pressure valueP N And the running speed of the vehiclevBelow 40 kM/h, the braking force of the vehicle is provided by a hydraulic stored-energy braking energy regeneration system, i.e.F z =F Y (ii) a At the moment, the hydraulic control system controller controls the electric motor and the hydraulic pump to work, so that the oil in the hydraulic oil tank enters the high-pressure energy accumulator to compress gas to achieve the purpose of energy storage. If the pressure value of the high-pressure energy accumulatorPLess than rated pressure valueP N And the running speed of the vehicle is less than or equal to 40vWhen the braking force is less than or equal to 80 kM/h, the braking force of the whole vehicle is provided by the braking energy regeneration system and the hydraulic energy storage braking energy regeneration system at the same time, namelyFz=F Y +F m (ii) a At the moment, the hydraulic control system controller controls the electric motor and the hydraulic pump to work, so that the oil in the hydraulic oil tank enters the high-pressure energy accumulator to compress gas to achieve the purpose of energy storage.
Step 5.3) SlowThe slow deceleration braking condition is as follows: when in usezAnd when the speed is less than or equal to 0.4, selecting a slow deceleration braking working condition. At the moment, the pressure value of the high-pressure accumulator is usedPGreater than the rated pressure valueP N The braking force of the vehicle being provided by friction braking, i.e.Fz=F m Otherwise the braking force of the vehicle is provided by a hydraulic stored-energy braking energy regeneration system, i.e.Fz=F Y . At the moment, the hydraulic control system controller controls the electric motor and the hydraulic pump to work, so that the oil in the hydraulic oil tank enters the high-pressure energy accumulator to compress gas to achieve the purpose of energy storage. For example, the following steps are carried out: when the strength of brakingzPressure value of high-pressure accumulator of =0.3PGreater than the rated pressure valueP N When the temperature of the water is higher than the set temperature,Fz=F m (ii) a When in usezPressure value of high-pressure accumulator of =0.3PLess than rated pressure valueP N When the temperature of the water is higher than the set temperature,Fz=F Y 。
compared with the prior art, the invention has the following beneficial effects:
the working current peak value of the lithium ion battery pack in the pure electric truck can be effectively reduced, and the service life of the lithium battery is prolonged; and the pure electric truck brake energy recovery rate with different brake initial speeds and brake strengths can be improved, and the economy of the electric truck is improved to a certain extent.
Description of the drawings:
FIG. 1 is a schematic diagram of a hydraulic regenerative braking control system for a pure electric truck that can employ the present invention;
FIG. 2 is a flow chart for data collection and computation of the present invention;
FIG. 3 is a flow chart of a method of the present invention for determining a hydraulic energy storage system brake regeneration control.
The specific implementation mode is as follows:
the following detailed description of specific embodiments of the invention is provided, but it should be understood that the scope of the invention is not limited to the specific embodiments.
Throughout the specification and claims, unless explicitly stated otherwise, the word "comprise", or variations such as "comprises" or "comprising", will be understood to imply the inclusion of a stated element or component but not the exclusion of any other element or component.
A hydraulic energy storage braking regenerative energy storage control system of a pure electric truck comprises a hydraulic pump, a hydraulic control system controller, a hydraulic oil tank, a high-pressure energy storage device and an electric motor; when the vehicle brakes, the hydraulic control system controller controls the electric motor and the hydraulic pump to work according to the current pressure of the high-pressure energy accumulator and the braking strength of the whole vehicle, so that oil in the hydraulic oil tank enters the high-pressure energy accumulator to compress gas to achieve the purpose of energy storage.
The electric truck is provided with a hydraulic energy storage braking regeneration system, a motor system, a transmission system and a braking system. The transmission system comprises a drive axle and a gearbox. The control system for the hydraulic energy storage brake regeneration of the pure electric truck is shown in figure 1. The motor of the vehicle rotates to generate driving force, and the driving force is transmitted to wheels through a transmission system to drive the vehicle to run; when a driver performs a braking operation, the vehicle is decelerated by a frictional braking force generated to wheels by a brake system.
It can be understood that: the energy storage system disclosed by the invention is only used for facilitating the public to understand the final selection of the deployment method and discloses a structure, and the energy storage process can be obviously realized by adopting the existing mature technology.
A control method based on pure electric truck hydraulic energy storage system brake regeneration is characterized in that a brake system controller receives a brake request signal through a bus and judges the brake request intention of a driver; the brake system controller calculates the braking force required by the whole vehicleF Z And real-time brake strengthz(ii) a The hydraulic control system is based on the real-time braking strengthzAnd pressure of the high-pressure accumulatorPCalculating the regenerative braking force that the hydraulic brake regeneration system can provideF Y (ii) a Finally, according to different braking strengths of the whole vehiclezAnd high pressure accumulator pressurePDifferent braking energy recovery strategies are selected.
1. When the driver issues a braking request:
(1) the braking system receives a braking request through a vehicle bus and enters the next process;
(2) the brake system judges the braking request intention of a driver, wherein the braking request signal comprises an accelerator pedal stroke signal, a brake pedal stroke signal and high-pressure energy accumulator pressurePAnd real-time vehicle speedv；
(3) The braking system judges the braking force required by the whole vehicleF Z And calculating the real-time braking intensityz；
(4) The hydraulic control system is based on the real-time braking strengthzAnd pressure of the high-pressure accumulatorPDetermining whether to provide braking force via a hydraulic brake regeneration systemF Y 。
FIG. 2 shows the analysis chart of step 1
2. When the braking energy recovery condition is met, the following operation conditions are selected according to the braking strength of the whole vehicle and the pressure of the high-pressure energy accumulator:
(1) emergency braking condition: when real-time braking strengthzWhen the braking force is more than or equal to 0.7, the emergency braking working condition is selected, and the braking force of the whole vehicle is completely provided by the friction braking force, namelyF z =F m (ii) a Wherein,F z the braking force required by the whole vehicle;F m is friction braking force; real time brake strength
Where a is the deceleration at the time of vehicle braking, and g is gravity. For example, the following steps are carried out: when the current braking strength of the vehicle is 0.8, the vehicle is in an emergency braking working condition, and the braking force of the whole vehicle is completely provided by the friction braking force.
(2) Medium intensity braking regime: when the braking strength is more than or equal to 0.4zAnd when the braking force is less than or equal to 0.7, selecting a medium-intensity braking working condition. At the moment, if the pressure value of the high-pressure energy accumulator isPGreater than the rated pressure valueP N When the braking force of the vehicle is provided by friction braking, i.e.F z =F m (ii) a If the pressure value of the high-pressure energy accumulatorPLess than rated pressure valueP N And the running speed of the vehiclevBelow 40 kM/h, the braking force of the vehicle is provided by a hydraulic stored-energy braking energy regeneration system, i.e.F z =F Y (ii) a At the moment, the hydraulic control system controller controls the electric motor and the hydraulic pump to work, so that the oil in the hydraulic oil tank enters the high-pressure energy accumulator to compress gas to achieve the purpose of energy storage. If the pressure value of the high-pressure energy accumulatorPLess than rated pressure valueP N And the running speed of the vehicle is less than or equal to 40vWhen the braking force is less than or equal to 80 kM/h, the braking force of the whole vehicle is provided by the braking energy regeneration system and the hydraulic energy storage braking energy regeneration system at the same time, namelyFz=F Y +F m ；
(3) The slow deceleration braking condition is as follows: when in usezAnd when the speed is less than or equal to 0.4, selecting a slow deceleration braking working condition. At the moment, the pressure value of the high-pressure accumulator is usedPGreater than the rated pressure valueP N The braking force of the vehicle being provided by friction braking, i.e.Fz=F m Otherwise the braking force of the vehicle is provided by a hydraulic stored-energy braking energy regeneration system, i.e.Fz=F Y . For example, the following steps are carried out: when the strength of brakingzPressure value of high-pressure accumulator of =0.3PGreater than the rated pressure valueP N When the temperature of the water is higher than the set temperature,Fz=F m (ii) a When in usezPressure value of high-pressure accumulator of =0.3PLess than rated pressure valueP N When the temperature of the water is higher than the set temperature,Fz=F Y . At the moment, the hydraulic control system controller controls the electric motor and the hydraulic pump to work, so that the oil in the hydraulic oil tank enters the high-pressure energy accumulator to compress gas to achieve the purpose of energy storage. At the moment, the hydraulic control system controller controls the electric motor and the hydraulic pump to work, so that the oil in the hydraulic oil tank enters the high-pressure energy accumulator to compress gas to achieve the purpose of energy storage. For example, the following steps are carried out: when the strength of brakingzPressure value of high-pressure accumulator of =0.3PGreater than the rated pressure valueP N When the temperature of the water is higher than the set temperature,Fz=F m (ii) a When in usezPressure value of high-pressure accumulator of =0.3PLess than rated pressure valueP N When the temperature of the water is higher than the set temperature,Fz=F Y 。
the flow chart of step 2 is shown in fig. 3.
The foregoing descriptions of specific exemplary embodiments of the present invention have been presented for purposes of illustration and description. It is not intended to limit the invention to the precise form disclosed, and obviously many modifications and variations are possible in light of the above teaching. The exemplary embodiments were chosen and described in order to explain certain principles of the invention and its practical application to enable one skilled in the art to make and use various exemplary embodiments of the invention and various alternatives and modifications as are suited to the particular use contemplated. It is intended that the scope of the invention be defined by the claims and their equivalents.
Claims (6)
1. The utility model provides a pure electric freight car hydraulic pressure energy storage braking regenerative energy storage control system which characterized in that: the hydraulic control system comprises a hydraulic pump, a hydraulic control system controller, a hydraulic oil tank, a high-pressure energy accumulator and an electric motor; when the vehicle brakes, the hydraulic control system controller controls the electric motor and the hydraulic pump to work according to the current pressure of the high-pressure energy accumulator and the braking strength of the whole vehicle, so that oil in the hydraulic oil tank enters the high-pressure energy accumulator to compress gas to finish energy storage.
2. A control method based on pure electric truck hydraulic energy storage system brake regeneration is characterized in that: the brake system controller receives the brake request signal through the bus and judges the brake request intention of the driver; the brake system controller calculates the braking force required by the whole vehicleF Z And real-time brake strengthz(ii) a The hydraulic control system is based on the real-time braking strengthzAnd pressure of the high-pressure accumulatorPCalculating the regenerative braking force that the hydraulic brake regeneration system can provideF Y (ii) a Finally, according to different braking strengths of the whole vehiclezAnd high pressure accumulator pressurePDifferent braking energy recovery strategies are selected.
3. The control method based on pure electric truck hydraulic energy storage system brake regeneration as claimed in claim 2, characterized in that: wherein the braking request signal comprises an accelerator pedal travel signal, a brake pedal travel signal and a high-pressure accumulator pressurePAnd real-time vehicle speedv。
4. The control method based on pure electric truck hydraulic energy storage system brake regeneration as claimed in claim 2, characterized in that: the method comprises the following steps:
step 1) a braking system receives a driver braking request;
step 2) the brake system controller receives a brake request signal of a driver through a bus, wherein the brake request signal comprises an accelerator pedal travel signal, a brake pedal travel signal and the pressure of a high-pressure energy accumulatorPAnd real-time vehicle speedv；
Step 3) calculating the braking force required by the whole vehicle by the braking system controllerF Z And real-time brake strengthz；
Step 4) calculating braking force of braking energy regeneration system by using hydraulic control system controllerF Y ；
Step 5) according to different braking strengths of the whole vehiclezAnd high pressure accumulator pressurePDifferent braking energy recovery strategies are selected.
5. The control method based on pure electric truck hydraulic energy storage system brake regeneration according to claim 4, characterized in that: dividing the vehicle braking process into three different working conditions, namely low-strength deceleration braking, medium-strength deceleration braking and emergency braking, according to the correlation between the vehicle braking strength and the pressure of the high-pressure energy accumulator;
under the low-intensity deceleration braking condition, two forms of braking are adopted: regenerative braking and friction braking of the hydraulic energy storage braking system;
under the condition of moderate-intensity deceleration braking, two forms of braking are adopted: regenerative braking and friction braking of the hydraulic energy storage braking system;
under the emergency braking condition, friction braking is adopted.
6. The control method based on pure electric truck hydraulic energy storage system brake regeneration as claimed in claim 2, characterized in that: step 5) specifically selecting the following operating conditions according to the braking strength of the whole vehicle and the pressure of the high-pressure energy accumulator:
step 5.1) emergency braking condition: when real-time braking strengthzWhen the braking force is more than or equal to 0.7, the emergency braking working condition is selected, and the braking force of the whole vehicle is completely provided by the friction braking force, namelyF z =F m (ii) a Wherein,F z the braking force required by the whole vehicle;F m is friction braking force; real time brake strength
Wherein a is the deceleration of the vehicle during braking, and g is gravity;
step 5.2) medium-intensity braking condition: when the braking strength is more than or equal to 0.4zWhen the brake pressure is less than or equal to 0.7, selecting a medium-strength brake working condition; at the moment, if the pressure value of the high-pressure energy accumulator isPGreater than the rated pressure valueP N When the braking force of the vehicle is provided by friction braking, i.e.F z =F m (ii) a If the pressure value of the high-pressure energy accumulatorPLess than rated pressure valueP N And the running speed of the vehiclevBelow 40 kM/h, the braking force of the vehicle is provided by a hydraulic stored-energy braking energy regeneration system, i.e.F z =F Y (ii) a If the pressure value of the high-pressure energy accumulatorPLess than rated pressure valueP N And the running speed of the vehicle is less than or equal to 40vWhen the braking force is less than or equal to 80 kM/h, the braking force of the whole vehicle is provided by the braking energy regeneration system and the hydraulic energy storage braking energy regeneration system at the same time, namelyFz=F Y +F m (ii) a At the moment, the hydraulic control system controller controls the electric motor and the hydraulic pump to work, so that oil in the hydraulic oil tank enters the high-pressure energy accumulator to compress gas to achieve the purpose of energy storage;
step 5.3) slow deceleration braking condition: when in usezWhen the speed is less than or equal to 0.4, selecting a slow deceleration braking working condition; at the moment, the pressure value of the high-pressure accumulator is usedPGreater than the rated pressure valueP N The braking force of the vehicle being provided by friction braking, i.e.Fz=F m Otherwise the braking force of the vehicle is provided by a hydraulic stored-energy braking energy regeneration system, i.e.Fz=F Y ；
At the moment, the hydraulic control system controller controls the electric motor and the hydraulic pump to work, so that the oil in the hydraulic oil tank enters the high-pressure energy accumulator to compress gas to achieve the purpose of energy storage.
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| CN116432131A (en) * | 2023-03-16 | 2023-07-14 | 安徽海博智能科技有限责任公司 | Online identification method for abnormal state of mine car braking system |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070013230A1 (en) * | 2005-07-12 | 2007-01-18 | Mando Corporation | Braking system for vehicle and braking method thereof |
| JP2013085456A (en) * | 2011-10-07 | 2013-05-09 | Dr Ing Hcf Porsche Ag | Method and device for controlling vehicle braking system including braking device |
| KR20160133765A (en) * | 2015-05-13 | 2016-11-23 | 현대중공업 주식회사 | Brake system and braking method for working machine |
| CN106314392A (en) * | 2016-08-18 | 2017-01-11 | 江苏大学 | Brake regeneration control method based on hybrid electric vehicle hydraulic energy storage system |
| CN106904079A (en) * | 2017-02-27 | 2017-06-30 | 中国第汽车股份有限公司 | A kind of regenerating brake control method of pure electric automobile |
-
2020
- 2020-06-24 CN CN202010587418.2A patent/CN111660823A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20070013230A1 (en) * | 2005-07-12 | 2007-01-18 | Mando Corporation | Braking system for vehicle and braking method thereof |
| JP2013085456A (en) * | 2011-10-07 | 2013-05-09 | Dr Ing Hcf Porsche Ag | Method and device for controlling vehicle braking system including braking device |
| KR20160133765A (en) * | 2015-05-13 | 2016-11-23 | 현대중공업 주식회사 | Brake system and braking method for working machine |
| CN106314392A (en) * | 2016-08-18 | 2017-01-11 | 江苏大学 | Brake regeneration control method based on hybrid electric vehicle hydraulic energy storage system |
| CN106904079A (en) * | 2017-02-27 | 2017-06-30 | 中国第汽车股份有限公司 | A kind of regenerating brake control method of pure electric automobile |
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| CN116432131A (en) * | 2023-03-16 | 2023-07-14 | 安徽海博智能科技有限责任公司 | Online identification method for abnormal state of mine car braking system |
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