Due to the configuration of IPB braking technical scheme, the braking distance and corresponding time of Hanche family at safety level are shortened, and the active and passive safety performance of the whole vehicle is directly improved; The brake pad of the brake cylinder is marked as "zero" contact with the brake disc, in exchange for lower driving power consumption (Korean EV model) and higher driving power generation (Korean DM model).
The New Energy Information Analysis Network will continue to launch a series of manuscripts on the interpretation of BYD Hanche family technology, and comprehensively display and analyze the vehicle platform, electric drive technology, super lithium iron phosphate battery technology, thermal management strategy of power battery, charging and discharging efficiency and vehicle application in the "three highs" environment.
Red Arrow: Han EV
Blue arrow: Han DM
Because the technical status of the modified subsystem of BYD Korean Car Family is still in the confidential stage, the electric drive technology of DM and EV cars in the new generation of Tang Car Family and Song Pro Car Family on sale is referenced. The DM car series and EV car series of Hanche family should be iteratively upgraded based on the existing technology, compared with Song Pro? DM cars are used interchangeably like that.
While continuously optimizing and upgrading the technical status of DM and EV, BYD will apply the IPB technical solution jointly developed with Bosch to the Korean car family. This technical solution for the requirements of driving braking, energy recovery and intelligent driving developed by new energy vehicles will be the first in the whole industry.
1, what is the IPB braking technology solution:
IPB technology can be understood as a braking system with motor as the driving unit, which replaces the braking system with power, and consists of vacuum pump, gas storage tank and brake master cylinder used by traditional fuel vehicles and most new energy vehicles at present.
IPB module monomer includes motor (power source), valve body (distribution source), computer (control source), brake master cylinder (actuator) and liquid storage tank (energy carrier), which are integrated together to form an electro-hydraulic integrated braking force generation, distribution and transmission assembly.
IPB braking technology solution integrated in new energy vehicles can seamlessly combine various control systems such as energy recovery, intelligent driving and body posture with vehicle control system and electric drive system.
In fact, the introduction of IPB braking technology solution is to make new energy vehicles (without the vacuum gas output from traditional internal combustion engines to help the brake master cylinder run) pass through the "electro-hydraulic integration" braking system.
Firstly, the node flexibility of energy recovery and braking force connection is solved, the energy recovery efficiency of driving motor end is improved, and the dependence (wear degree) on brake cylinder (brake pad and brake disc) is reduced.
Secondly, communicate directly with the vehicle control system (VCU) to obtain higher-level data. By calculating the step release control force, the body posture is more stable during acceleration and braking, and the comfort of drivers and passengers is improved.
Finally, under the premise of establishing and perfecting laws and regulations, vehicles should keep a safe distance from the vehicles in front in the case of complex urban morning rush hours and frequent acceleration of braking, and be wary of cutting in line.
2, the existing new energy vehicle braking system technology:
At present, the brake master cylinder +ABS system equipped with vacuum booster for mass-produced fuel vehicles in the world constitutes a simple and reliable braking technology solution. However, according to the different market positioning of vehicle models, the functions of brake master cylinder +ABS system+ESP system with vacuum assistance are becoming more and more perfect, with more accurate braking force distribution, traction control, wheel speed difference suppression and other functions to ensure active driving safety.
The above picture shows a close-up of Navarra's master brake cylinder and ABS valve body produced by Zhengzhou Nissan. When the brake master cylinder is repeatedly trampled, the vacuum booster outputs vacuum gas to reduce the torque, and the brake fluid is input into the ABS valve body through the pipeline and calculated, and then the brake fluid with different torques is distributed to each wheel brake cylinder, so that the attitude of the vehicle under acceleration and braking conditions is controlled within a safe range.
The braking system and ABS system (including ESP system) based on traditional fuel vehicles all rely on the vacuum gas output from traditional internal combustion engines, but the proportion of electro-hydraulic energy of ABS system has increased, which cannot completely replace the mechanical energy of braking system.
Considering the cost and technology, most mass-produced new energy vehicles in China market are equipped with vacuum-assisted brake master cylinder +ABS system (including ESP system) similar to those used in fuel vehicles. But it is not the vacuum gas of internal combustion engine, but the vacuum valve body and gas storage tank are used to replace the motor and cooperate with the brake master cylinder to form a complete "electromechanical" braking system.
The vacuum gas generated by the vacuum valve body is stored in the gas storage tank and transferred to the brake master cylinder structure, which still does not get rid of the problem that the air of the traditional fuel truck is thin at high altitude, or the vacuum gas is exhausted due to frequent braking, which leads to the reduction of braking force assistance effect.
20 17 elantra EV made by Beijing Hyundai is the first to introduce the point-liquid integrated braking technology solution provided by mandu. The vacuum valve body and air storage tank are abandoned, and the braking system and energy recovery system of the whole vehicle are jointly controlled by the electronic control pressure unit and the braking valve body. This braking technical scheme, named iBAU, has the most remarkable effect of improving energy recovery efficiency and replacing part of braking force. When the braking force generated by energy recovery is insufficient and mechanical braking force is involved, the braking attitude of the vehicle is more linear.
The above picture shows a close-up of the technical status of the iBooster electro-hydraulic integrated brake master cylinder integrated by Aichi U5 electric vehicle and provided by Bosch. This second-generation iBooster technical scheme adopts the structure that the brake assembly and ABS valve body are set separately.
The above picture is a close-up of the technical status of the second generation iBAU electro-hydraulic integrated brake master cylinder provided by Beijing Hyundai ANSINO EV Adaptor Mentor. Compared with Elantra EV mass-produced in 20 17 and Anginot EV mass-produced in 20 19, the second-generation iBAU system integrates the brake master cylinder with the ABS valve body, which directly improves the speed of signal feedback, calculation, output and execution.
Obviously, it is undoubtedly a technical route that conforms to the law of scientific development to adapt special vehicle platform and electro-hydraulic integrated brake master cylinder for new energy vehicles.
3. Why does BYD adopt IPB technology for Han car owners?
To be sure, BYD's IPB braking technology solution for Korean car owners comes standard with functions such as "AEB automatic emergency braking", "CRBS regenerative braking" and "CST comfortable braking".
Through this cold test in yakeshi, the author most intuitively experienced that the suspension stroke of the front and rear drive axles will be stretched or squeezed during the rapid acceleration and emergency brake release of the DM and EV models of Han family with integrated IPB braking technology solution.
When accelerating rapidly, the center of gravity of the car body shifts to the rear drive axle, the front suspension stretches and the rear suspension squeezes; During emergency braking, the center of gravity of the car body shifts to the front drive axle, and the front suspension squeezes and the rear suspension stretches.
For the Korean EV four-wheel drive version with an acceleration of 100 kilometers for X.X seconds, the intervention of IPB braking technology scheme can more accurately control the traction distribution of front and rear drive axles during rapid acceleration and obtain a safe driving posture; During emergency braking, the braking force distribution of the front and rear drive axles is constantly adjusted, and the forward range of the center of gravity and the torque release intensity are restrained, so that the stretching and squeezing ranges of the front and rear suspension strokes are similar, and the comfort of drivers and passengers is improved.
Both Han DM and Han EV are equipped with super electric four-wheel drive technology and electric four-wheel drive technology. When the road conditions with different adhesion are accelerated, the torque distribution speed of wheels on both sides of the same drive axle and wheels of different drive axles is Bitang 80 more frequently.
When carrying out emergency braking under road conditions with different adhesion, the intervention of IPB braking technology solution can distribute torque more quickly, always firmly control the attitude of the car and ensure the safety of drivers and passengers.
IPB technical scheme inevitably requires BYD engineers to consider the load of front and rear drive axles of different models and the control strategy brought by the power output switching process of different power sources.
China automobile family with integrated IPB braking technology solution, TTL (time? Where to? Lock) <150ms (the smaller TTL, the better braking response). Compared with traditional vehicles, the driver's TTL is reduced by 50ms, and the corresponding braking distance is reduced by1.38 m. Another advantage of short braking response time is that the performance of active braking AEB will be very good. Compared with traditional vehicles, TTL is reduced by150-350ms during active braking. Because the braking response time and braking distance are shortened, the Korean car family will get better results in the C-NACP test.
As an additional function, BYD developed the BDW function (brake disc wiping) for Korean car owners. When driving in rainy season, rain splashes on the brake disc, which will affect the friction. The appearance of BDW function can automatically eliminate the rain film on the brake disc, ensure that the braking force is in a normal state, and provide users with safer driving protection.
4. Return to the traditional car-making field and continuously expand the technological advantages of Korean car owners;
In addition to the advantages of stronger linear braking force and higher energy recovery efficiency, the above-mentioned IPB braking technical scheme has a special contribution to new energy vehicles, that is, it can save the loss of brake cylinders (brake discs and brake pads).
At present, the traditional vacuum assisted brake master cylinder, iBAU electro-hydraulic brake master cylinder, the second generation iBooster electro-hydraulic brake master cylinder, and new energy vehicles, all the adapted brake discs and brake pads are in a "contact" state, and start to float when driving, but there are still braking force settings. Invisible, the energy consumption from the braking system is ignored by the designer from the technical root.
The above picture shows a close-up of the brake disc of the front brake cylinder of the new generation Tang DM in the parking state.
Due to the integration of IPB system, the energy feedback utilization rate of Han DM or Han EV reaches over 86%. Under more than 90% braking conditions (city car mode), the motor can be driven to "reverse" to play a braking role, and the hydraulic braking part is rarely used, so the brake pad utilization rate of the brake cylinder is reduced to a very small state. The stability of energy feedback when the vehicle is taxiing and the stability of energy feedback under braking conditions are handled by IPB braking technology solutions. The wheel dynamics can be obtained directly through the wheel speed sensor, and the stability of the vehicle can be ensured through fast and efficient processing.
Therefore, the energy recovery efficiency of the electric drive system is higher, and the service efficiency of the brake cylinder will be reduced. During driving, the brake pad and the brake disc of the brake cylinder can be set to be completely out of contact, instead of being set to a "semi-linkage" floating state.
The combination of IPB braking technology solution with Korean DM and Korean EV can completely get rid of the fuel consumption and power consumption caused by brake cylinder during driving. The reduction of energy consumption brought by this sudden technological progress is translated into the improvement of power generation efficiency of BSG driven by DM liquid cooling in Korea. Reduction of comprehensive power consumption of Korean electric vehicles in 100 km conversion.
As of press time, BYD Korean DM and EV models will become the first China-made new energy vehicle family in the world to adopt IPB braking technology solutions. This also leads to the combination of IPB braking technology scheme and DM vehicle with more complicated technology, and there is no mature scheme to learn from. In order to combine IPB braking technology with Korean DM and Korean EV more naturally and smoothly, BYD engineers have done a lot of preparatory work.
In particular, the problems encountered by DM models and EV models of other car families are sorted out, and finally transformed into the control strategy of IPB system, trying to achieve the best state of energy feedback utilization, stability and comfort adaptation.
The author has something to say:
It is almost certain that the Hanche family only includes DM and EV models, and fuel vehicles will no longer be introduced. Previously, the author wrote the article "Comprehensive Research on the Technical Status of BYD Hanche Electric Drive and Power Battery". Among them, the vehicle platform, electric drive and power battery technology of Hanche family are predicted.
Comparison, comparison of relevant data obtained by cold evaluation of yakeshi Hanche family,
The popularization and application of Korean car family electric drive technology is based on the existing DM and EV technologies in different ranges. Compared with lithium iron phosphate batteries adapted to e6 and K series electric buses, the new super lithium iron phosphate battery technology has more performance evolution based on structural optimization (indirectly improving energy density).
The improvement of the platform technology of Hanche family car comes from the refinement of the medium and large platforms being developed. While satisfying the design and calibration of DM and EV models, the setting of different sizes of super-ferrous lithium phosphate power batteries, fuel tanks and suspensions, and the solution of IPB braking technology, BYD's breakthrough in manufacturing new energy has once again shifted from electric drive technology to traditional car-making level.
Basically, it can be determined whether the wheelbase of Hanche family is close to 3000mm, which is conducive to the arrangement of super lithium iron phosphate batteries with density and energy, and ensures that many functions of the car body meet the preset requirements.
It is exciting that BYD is cooperating with foreign countries to seek the improvement of handling and comfort of Korean car owners and even a new generation of Tang car owners and new car owners introduced later. In order to meet the needs of different car users, the economy of DM models and the improvement of extreme climate cruising range stability of EV models will also be reflected in the Korean car family.
To be continued. . .
Text/New Energy Information Analysis Network Song?
This article comes from car home, the author of the car manufacturer, and does not represent car home's position.