The "armpit" that the owner often mentions is mainly caused by the problem between the difference of the remaining mileage/SOC (remaining capacity of the battery) of the electric vehicle and the actual situation of the vehicle. The essence is the SOC of the battery, the available energy, and the conversion. To the true cruising range, this is a matter of uncertainty about how many kilometers to open.
First, the actual situation of the owner
Electric car owners actually have a typical mentality, there is no driving (license, limit), in fact, many people are not willing to try to buy electric cars. For a car owner who is over-fueled to an electric car (especially a pure electric car), a big problem is the uncertainty of vehicle use.
1. The actual situation of the owner of the Star Friends Club
The mileage and SOC of electric vehicles are declining, especially in the later stage, and the initial reference mileage is set too high, making this difference very large, and the owners often need to adapt in advance.
2. Some posts on the web describe the armpit encounter of an electric car.
In the case of a foreign Tesla owner, the user is unfamiliar with the electric vehicle. The vehicle used by the owner is fully charged. The meter shows the remaining mileage of 247 miles. From the departure point Barstow to the destination Kingman charging station. The distance is 209 miles and the expected tolerance is 38 miles. The owner drove 100 mph at a high speed. In actual use: the mileage was faster than the energy. After running 100 miles, the available mileage was 120 miles. The owner began to worry, turn off the sound, and dim. Large screen and lower speed to reduce battery consumption. When it was 7 miles from Kingman, the electricity indicator showed zero. At 3 miles before arriving at the destination, the electric car "armpit"
Second, how to improve to meet user needs
There are many factors involved in the mileage estimation process. In simple terms, it can be divided into several main programs:
Procedure 1: Extracting SOC and battery information from battery parameters SOH [Battery Calculation Strategy]
No matter how to do it, the calculation error of SOC is strongly related to the working condition. The SOC algorithm obtained here is effective for one car and one chemical system. Even with a SOC algorithm, the difference in accuracy varies under different use cases. There is also a large temperature effect. In a certain interval (0 to 25 degrees), this precision is effective, and the accuracy will be worse in other ranges, which results in strong coupling of parameters to the thermal management system.
Procedure 2: Estimate available energy from SOC, SOH [intermediate information, management strategy]
Kwh is the available SOC range, or is given a SOC interval that can be compensated. To play reality, the V and SOC and Ah integrals can be made, and a calculated value based on the predetermined discharge current and temperature can be made. The available energy (kwh) is then estimated based on kwh. This method is a bit problematic. The voltage condition is highly correlated with internal resistance and driving profile. It is not very beneficial to the driver through this intermediate quantity. It is somewhat complicated to use this value and output power analysis.
Procedure 3: Estimate the remaining mileage from the available energy and high-pressure energy usage [remaining mileage and energy management strategy]
In fact, program 2 and program 3 can be combined together or not. Taken together, it is an estimate of the SOC and battery capacity corresponding to the mileage.
Essentially, there are indeed three reference mileage values ​​for the upper, upper, and lower limits to be corrected at any time.
The real situation is indeed as follows:
Future development requires more information to be corrected earlier. This procedure, in the future, must be placed in the VCU (VCU is the core electronic control unit that implements vehicle control decisions), and data is coordinated through multiple domains. The simpler approach is to optimize the mileage of the commuter route to meet the estimated basic consumption, and then further collect the main routes. Some cloud processing and data estimation, I believe that can be combined, is similar to the search charging pile. The behavior of the class.
summary
To put it simply, everyone talks about the optimal mileage and working mileage too much, which makes the whole mileage exaggerated. The customer's psychological subconscious mind associates the entire mileage and battery energy. There is actually a powertrain and Additional energy consumption such as HVAC (HeaTIng, VenTIlaTIon and Air CondiTIoning, heating ventilation and air conditioning).
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