What is the relationship between the transmission and the engine?

[Ulysses]

The relationship between the transmission and the engine is: the engine outputs power to the transmission, which controls the power and then transmits it to the car wheels. The functions of the transmission: 1. Change the transmission ratio to expand the variation range of driving wheel torque and speed, adapting to frequently changing driving conditions while keeping the engine working under favorable conditions; 2. Enable the car to reverse while keeping the engine rotation direction unchanged; 3. Use neutral gear to interrupt power transmission, allowing the engine to start, idle, and facilitating gear shifting or power output. The function of the engine is: to convert the thermal energy of gasoline into mechanical energy by expanding gas after combustion in a sealed cylinder, pushing the piston to do work.

[JuliannaFitz]

The relationship between the transmission and the engine is akin to a running partnership. The engine is responsible for providing powerful propulsion, much like the legs generating forceful strides, while the transmission acts as the coordinating arms that adjust speed changes, ensuring the pace is neither sluggish nor strenuous. In actual driving, the engine's power output is directly transmitted to the transmission, which, by shifting through different gear ratios, allows the car to have strength when climbing at low speeds and fuel efficiency at high speeds. For example, starting from a red light in a low gear enables quick acceleration, but attempting to climb a hill in third gear would strain the engine and waste fuel. If the transmission malfunctions, even the most powerful engine may struggle to move the car and could damage the drivetrain. Only when they work in harmony can the car run smoothly and efficiently. In short, understanding this partnership helps me drive more smoothly each time and reduces potential issues.

[LaJaxon]

From a physical principle perspective, the engine is the component that generates the original power. It burns gasoline to produce torque and rotational speed, but if directly connected to the wheels, the car would only operate like a fixed machine. The transmission plays the role of a converter here, adjusting the output power through changes in gear ratios. For example, when the engine speed is high, the low gear of the transmission can amplify the force, making it suitable for climbing steep slopes. On highways, the high gear of the transmission reduces the speed, thereby improving fuel efficiency and reducing noise. Automatic transmissions can monitor the vehicle speed in real time and shift gears automatically, while manual transmissions rely on human operation to select the appropriate gear. Both work together to prevent engine overload or resource wastage. During maintenance, changing the transmission oil ensures proper lubrication of the gears, preventing power transmission blockages, thereby extending the lifespan of the entire system.

[OStephen]

Driving safety heavily relies on the coordination between the transmission and the engine. The engine provides driving power, while the transmission controls the smoothness of power delivery. If the transmission responds sluggishly or malfunctions, such as causing gear shift confusion during emergency braking, it can lead to wheel slippage or loss of control. Especially in rainy conditions, quick gear shifts ensure stable power distribution from the engine to the tires, preventing skidding on slippery roads. A good transmission system promptly responds to acceleration demands, preventing sudden engine knocking or stalling. Regular maintenance of both, such as checking transmission fluid levels, helps detect issues early and avoids potential breakdowns on the road.