Enhancing Engine Starting Performance using High-Power Density Brushless Starter 2020-01-0459
Modern hybrid technologies, especially mild hybrid and Auto-Start-Stop, demand a starter with higher power, better performance, and much higher life cycles. Therefore a new design of the starter using brushless motor is proposed in this paper which improves the functions of the brush-type starter due to lower inertia, higher torque and wider power band capability of the brushless motor, especially at higher speeds. The overall integrated system includes the motor, inverter, controller packaged in the same form factor of the original assembly housing and can be dropped in the existing engine designs. The design as the example in this paper applies 48V and 4kW can also be applied to various voltages such as the widely standard 12V.
This paper will describe in detail the functionalities of the over systems, the simulation and experimental results of the prototype on engine test fixture with a 4-cylinder engine, and application in a crossover vehicle.