Pacific Automotive Network Technology Channel In the first half of this year, a piece of news that the BRZ\\86 was discontinued due to CAFC and fuel consumption limit standards exploded in the domestic automobile circle. Although the national car was stopped in China, The reason for the sale is not only because of CAFC, but the regulation of the 5L fuel consumption limit per 100 kilometers has entered the attention of the general public. To achieve an average fuel consumption of 5L per 100 kilometers in 2020, is it going to revolutionize the lives of domestic car companies?
Passenger car fuel consumption target
Before we begin, let’s review what the fuel consumption target is:
Passenger car fuel consumption Target value
Time
2016
2017
2018
2019
2020
Total passenger car production forecast (10,000 units)
2100
2200
2300
2400< /p>
2500
Industry fuel consumption target value (L/km)
6.7
6.4
6.0
5.5
5
New energy vehicle production forecast (10,000 units)
20
50
< p>80110
140
New energy vehicle calculation multiple
3
2
Propose new energy vehicles after traditional energy vehicles
Target value (L/km)
7
6.6
6.2
However, compared with the average fuel consumption limit, the fuel consumption limit of a single model is much more friendly, and there is basically not much pressure on most current models. Regarding the seemingly insignificant single-vehicle fuel consumption limit, the explanation given by the Ministry of Industry and Information Technology is: "The purpose is to allow companies to adjust their product structures to meet the national minimum entry requirements on the basis that the fuel consumption of passenger car models meets the national minimum entry requirements." The average fuel consumption requirement allows a certain degree of flexibility for the company’s product structure adjustment.”
Let’s talk about 48V systems
When it comes to fuel saving, the first reaction of onlookers may be. Think hybrid. Yes, using hybrid power can indeed bring significant fuel savings. However, hybrid technology cannot be independently developed overnight, and costs have been rising.
Currently, the P13 power split mode is surrounded by Honda Accord’s sharp hybrid, General Motors’ Voltec, and the CHS hybrid system jointly developed by Geely and Corun. If you want to avoid these technology patents, you have to It has become more difficult.
Currently, the on-board electricity used in cars is mainly based on 12V electrical systems. If it is changed to 48V, it means that all the traditional electrical appliances that you can think of in the car that adapt to 12V voltage will need to be redesigned and produced. It's not just as simple as replacing the battery and wiring harness. But what does 48V have to do with our topic today?
So if you want to introduce a light-hybrid system that is not too expensive to achieve good fuel-saving results, you have to introduce a 48V electrical system. After adopting the 48V electrical system, the fuel saving effect caused by start and stop is better, and braking energy recovery can be applied. The weight of the motor and solenoid valve has also become lighter, which is of great benefit to the energy saving performance.
Involving the upgrade of components such as chassis, powertrain, air-conditioning system and body system, upstream parts suppliers also need to cooperate in technological updates, which is difficult to achieve in a short time. Domestic configurations pursue high standards. For cost-effective car companies, the pressure is even greater.
So the 12V+48V system came into being, that is, adding a 48V battery and a DC-DC voltage converter to the 12V. The idle start-stop system and braking energy recovery system use 48V voltage, while other automotive electrical components continue to use 12V voltage.
In addition, the chassis part also uses an electronic rotary shock absorber, which integrates the functions of an anti-roll bar and a shock absorber. It can actively adjust the roll stiffness and pitch stiffness, and can also use the motor to Recycling the energy generated by wheel beating and arming the vehicle with energy-saving technology is commendable.
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2 Internal combustion engine technology to achieve fuel saving Back to top
Relatively mature internal combustion engine technology
In addition to the fuel-saving and cost-effective light-hybrid systems mentioned above, some existing mature internal combustion engine technologies can also be applied.
Secondly, through EGR exhaust gas circulation, the cooled exhaust gas recirculation can not only lower the combustion temperature and reduce NOx, but also improve the pumping gas loss by increasing the intake pressure.
Summary
Achieving the 5L/100km regulation in 2020 is completely feasible for domestic mainstream car companies. After all, there are more stringent fuel consumption limits in European and American countries. In view of the value (European countries stipulate that the average fuel consumption must reach 3.8L/100km in 2020), the biggest challenge is to weigh the relationship between the benefits and costs brought by various fuel-saving technologies. Although technological breakthroughs and innovations do not have much positive effect, businessmen also understand that if you fall behind, you will be beaten. It is also a good thing to keep up with the pace of the predecessors without widening the gap. Finally, I hope that this time the fuel consumption limit standard will be implemented. Not stillborn. (Pictures/Text/Photography: Zhang Jingsen of Pacific Automotive Network)