Extended program of pure electric vehicle specifications
The principle of parameter matching of extended range electric vehicle is to match the parameters of the vehicle powertrain according to the structural characteristics of the vehicle powertrain and the vehicle design indicators (power, economy, driving range, etc.).
In view of the special conditions of extended range device, extended range development technology also need to meet the following two requirements:
(1) stable and reliable, can quickly enter the use of state
Extender as an energy supplement device, you need to ensure its stable and reliable, when you need to start the device, you need to be sure to immediately start and into the normal working condition.
(2) Through the control strategies and optimization measures to ensure that the system is in the best condition
Due to the complicated working conditions, the system is required to work at the optimum operating point in order to achieve the high efficiency and low emission requirements. Therefore, the controller is very critical, and the control strategy and optimization measures need to be adopted to improve the economy under the premise of ensuring vehicle power And efficiency.
Exhibit 1: Main technical indicators of extended range electric vehicles
Source: Foresight Industry Institute finishing
Increased by pure electric vehicle principle
If you do not consider the parking and charging process, the basic mode of operation of extended pure electric vehicles (EREV) that is divided into pure electric mode and extended range mode.
1, pure electric mode: belongs to power consumption phase
According to the characteristics of the best working range of power battery, pre-design a state of charge SOC minimum threshold SOCLOW, when the battery SOC value is above this threshold, EREV in pure electric mode.In pure electric mode, the vehicle and pure electric vehicles, from Power battery to provide energy by the driving motor to provide driving power.
Figure 2: Pure electric mode energy transfer route
Source: Foresight Industry Institute finishing
2, extended mode: a power maintenance phase
As the vehicle is running in purely electric mode, battery SOC gradually decreased, when below the set threshold, if you continue to use the battery, will reduce the battery life. At this time, should start the extender, the use of extender And the excess electric energy charges the battery, so that the battery SOC slightly increases to the predetermined threshold SOChi and keeps the SOC between the two closed values, that is, SOC1m≤SOC≤SOCh until the vehicle stops Charging, the battery is full, after the vehicle is running, and into pure electric mode.
Exhibit 3: Extended Range Energy Delivery Routes
Source: Foresight Industry Institute finishing
