Peugeot Forums - Peugeot Fan Club

TORQUE AND POWER RELATION

Homepage » PEUGEOT MODIFIED PLATFORM » Modification and Tuning Information
08.05.2020 14:02 # 1
Guests
The relationship between power and torque is often confusing for many. We often use these two terms when comparing cars, but most of us leave out which one is more important, we don't even know exactly what it means. There is an old saying: Torque wins racing, power makes cars sell. Is this really true? Here in this article we will clarify these two topics. In summary, power and torque are completely separate things, and their units of measurement are also different. Torque: Torque is the rotating force. The measurement unit of torque, which is a concept independent of motion and time, is Nm (Newton * meter). Torque is created with the help of a lever when force acts on a fixed, rotating point. When we apply 1 Newton (1 / 9.8 kg. - 9.8 N = 1 kg.) Force to a fixed, rotating point with the help of a 1 meter long arm, 1 Nm torque arises. In cars, torque arises on the crankshaft. It travels through the transmission to the axle where the traction wheel is located and is transferred to the road as a linear force with the wheels connected to the axle. We can easily calculate the linear force transferred by the wheels to the ground, knowing the torque transmitted to the axle where the traction wheel is located. Linear force = (torque transmitted to the axle) / (radius of the wheel) The torque produced by an engine varies with the speed of the engine and is indicated by a curve on the graph. This curve creates points that indicate torque values measured momentarily at each revolution. By ignoring the power losses at the time of driving, we can say that the torque on the crankshaft is always proportional to any gear with the linear force that drives the car. If it had a perfectly flat torque "curve", the car would accelerate with constant acceleration, no matter what gear, at what speed. However, in real life torque "curves" are not straight. they rise to make ceilings and fall again at very high speeds. An automobile accelerates best when it drives the engine (in any gear) at the speed it gives its highest torque. Notice, we have determined how to achieve the best acceleration and have not even mentioned about horsepower. Power: Power is the rate of doing work and the unit of measure is W (Watt). Unlike torque, power is dependent on the concepts of time and motion. We can show a direct link between power and torque. The power generated by an automobile varies depending on the circuit the engine rotates, and is typically indicated by a curve on the graph. To put the relation between power and torque into the formula: Power = Torque * (the revolution at which the torque value is produced) / 5252 Note: This formula is valid only when torque is lbf and power is in units of HP. To summarize what we have learned up to this point: - The acceleration of the car is the conversion of torque on the axle to linear force on the wheel. - The best acceleration in any gear is provided at the speed at which the engine produces the highest torque. - Power, torque and circuit is a function dependent. If you have decided at this point that power is insignificant, you are wrong. Please continue reading. The transmission is the most important factor in the acceleration of the car. To explain the relationship between power and torque, and to show that power is not as insignificant as described in the article so far, let's consider a two-speed gearbox with a 2: 1 ratio of the first gear and a 1: 1 ratio of the second gear. And again, as a hypothesis, let's connect this gearbox to a motor that produces 100 Nm of torque in the crankshaft at every revolution. The second gear with a 1: 1 ratio rotates the driving shaft at the same speed as the crankshaft and exactly 100 Nm force is transmitted to the ground (We assume no friction forces.). However, the first gear with a ratio of 2: 1 turns the driving shaft at half the crankshaft and twice the power produced by the crankshaft, that is 200 Nm, is transmitted to the ground. So our car accelerates two times better than in first gear, than in second gear. At this point, the key to the importance of horsepower lies. By downshifting, the maximum torque (for a certain speed) transmitted to the wheels is ensured when the car's engine is operating at the speed at which it produces the highest power. As a result of the product of torque, we can say that an automobile accelerates best whenever a gear is selected that brings the circuit in which the engine produces the highest power at any speed. This is the reason why small engines with high speeds are sometimes superior to large motors that cannot convert much. In a motor capable of rotating high speeds, although the torque transferred to the crank is low, a much higher torque can be transferred to the wheels thanks to the torque multiplication.
08.05.2020 14:02 # 2
AydinBeyol
thanks for informations
Peugeot Forums - Peugeot Fan Club © 2024
“The most auspicious of people, it is people who are useful.”