A system is proposed for converting any vehicle into a hybrid (from the components shown in Figure 1) with a set of functions close to the technology "mild hybrid." A feature of the new system is the acquisition by vehicles of special functions that are not inherent in the classic hybrid built on the technology of "mild hybrid," through the use of low-power electric drive and traction rechargeable battery (TRB) of small capacity. The new system provides the following functions for vehicles:
- braking energy recuperation (traditional);
- ICE assistance (change of ICE operating point and acceleration, traditional);
- electric start (when high dynamics is not required, for example when driving in traffic jams) (extension of this function to the technology of "mild hybrid" see Figure 2);
- support for sustainable movement (new function, see Figure 2).
The connection to the OBD provides the ECU with additional information, the receipt of which does not require a high speed of information retrieval (see Figure 1). The connection to the E-Gas provides information from the electronic pedal to form the required power distribution between the ICE and the EM. In the absence of an electronic pedal, its additional installation is required. If there is no connection to the E-Gas, you can use the signal from the choke position sensor. In this case, it is impossible to implement the mode of take-off on electric traction. In the context of optimizing the size and cost of the motor and traction rechargeable battery (TRB) for the hybridization system of the vehicle is not rational to use these components with technical characteristics that can cover the entire range of accelerations of the vehicle while driving. Judging by the distribution of accelerations, noticeable effects can be achieved with significantly less motor power and TRB capacity. In addition to reducing the cost of the system, the focus on less power will lead to a moderate increase in the weight of the vehicle, which is converted into a hybrid, primarily due to the small TRB. This will have a positive effect on the dynamic properties without overloading the ICE either or the electric machine.
The new function provides for the spread of such a function as movement on pure electric drive on vehicle built according to the "mild hybrid" technology. The speed V1 in Figure 3 indicates the speed limit to which movement is possible when the electric motor is fully covered by the power to move the vehicle. To the right of point V1, in green, are marked options for changing the power of the electric motor to provide different percentages of power compensation of the ICE. After point V2, the movement of the vehicle is fully provided by ICE, and the electric machine can turn off or go into generator mode to charge the TRB. The points V1 and V2 can be adjusted according to the length and speed of the city route.