What is the relationship between torque and engine speed?
2 Answers
Under the condition of fixed power, torque is inversely proportional to engine speed. The faster the speed, the smaller the torque, and vice versa. The specific introduction is as follows: 1. Speed: In the engine, speed refers to the number of revolutions the crankshaft makes per unit of time and is directly related to the vehicle speed. When the gear remains unchanged, an increase in engine speed leads to a corresponding increase in vehicle speed. The speed is ultimately reflected on the wheels after being reduced and torque increased by the entire transmission system, including the gearbox and final drive. Therefore, the ratio of engine speed to wheel speed is the final drive ratio of the entire transmission system. 2. Torque: Torque is probably the most abstract parameter in the minds of car owners, used to describe the rotational force of the engine crankshaft. For example: it's like using a wrench to tighten a screw. The more force you apply to the wrench, the greater the torque on the screw, and vice versa. This means that the greater the torque, the more traction it provides to the car. The greater the engine torque, the faster the car accelerates, and the stronger its towing capacity.
The coordination between engine RPM and torque during throttle application determines the vehicle's acceleration feel. Simply put, torque represents the engine's instantaneous power output, similar to the force used when tightening a screw, while RPM indicates how fast the engine is rotating. Starting or climbing requires high torque, typically at lower RPMs but with strong pulling power, creating that intense push-back sensation. During high-speed cruising, maintaining RPM is crucial while torque demand decreases. The most fascinating part occurs when you floor the accelerator - the engine delivers peak torque within a specific RPM range, accompanied by a sudden deepening of the engine note. Different engine calibrations vary significantly - some vehicles deliver strong power at low RPMs, while others need to rev higher to unleash their full potential.
