Solenoid Assembly Electronic Switch Starter Motor Pinion Protection

The patent replaces the conventional mechanical switch with an electronic switch (MOSFET) that can independently control motor current. This electronic control system allows for precise timing and sequencing of pinion engagement and motor activation, preventing pinion damage by ensuring proper synchronization while enabling quick restarts even during negative engine rotation. The electronic switch provides more reliable control compared to mechanical contacts, resolving the contradiction between reliability improvement and structural complexity.

The patent segments the control functions by separating the pinion engagement control (solenoid) from the motor current control (electronic switch). This segmentation allows independent optimization of each function - the solenoid handles mechanical pinion engagement while the electronic MOSFET switch handles motor current timing. This independent control enables quick engine restarts during oscillating periods by precisely controlling when motor current is supplied, without being constrained by mechanical switch limitations.

The electronic switch assembly serves multiple functions: it controls motor current timing, prevents pinion damage through synchronized control, enables quick restarts during negative rotation, and provides protective functionality. By consolidating these multiple functions into a single electronic control module rather than requiring separate mechanical mechanisms for each function, the patent improves reliability and performance while managing manufacturing complexity through functional integration.