The mechanism in question is designed to maintain a consistent engine speed when the vehicle is at rest, preventing the engine from stalling. It ensures a minimum throttle opening, compensating for factors like engine load and temperature variations that can affect idle stability. This component contributes to smooth transitions between driving and idling modes.
Stable idling is crucial for overall vehicle performance and fuel efficiency. By maintaining a consistent engine speed, this mechanism reduces the likelihood of stalling, which can be inconvenient and potentially dangerous. Its implementation has historically been refined to optimize engine responsiveness and minimize emissions.