How much power is enough and how much is strong?

2022-07-11 0 By

Novice drivers do not know how to determine whether the power of the vehicle is enough when they choose a car. Most of the displacement can ensure that they can meet their needs after passing the novice period.Choose big fear of high oil consumption, choose small fear of poor power, how to choose?To interpret this problem, we need to analyze the fuel injection system of internal combustion engine and the integrated transmission of air intake system. At the same time, we need to explain the characteristics of the motor thoroughly, otherwise it is difficult to understand the relationship between energy consumption and power.Most readers don’t have the patience, however.So let’s just generalize and learn the simplest way to do it.Multi-point electric injection direct injection natural suction turbocharged fuel power plug-in hybrid plug-in hybrid ≈ pure electric vehicle plug-in hybrid includes range electric vehicles this is the general standard, the reason is not detailed.Two quick notes: first, internal combustion engines don’t burn well, even in hot cars.Therefore, to improve the full degree of fuel combustion can improve power and reduce fuel consumption, direct injection technology and turbocharging technology are used to improve, 1.5T multi-point electronic injection machine most of the maximum power is 100-120KW, peak torque 200-240N·m;And 1.5t cylinder direct injection machine can reach 130-150KW, peak torque can reach 270-300N·m;The 2.0T can increase from 130~ 140kW to 200~ 220kW, and the peak torque increases from less than 300N·m to more than 400N·m.Plug-in hybrid vehicles or pure electric vehicles with added motors will inevitably have stronger power and lower energy consumption, because the motor can burst the maximum torque as soon as it starts, while the maximum torque of naturally aspirated internal combustion engines usually bursts only after 4000 revolutions and then decreases.Turbo supercharger reaches peak speed in the speed range of 1500~2000rpm and continues to output to about 4000 RPM and then slide, which is much worse than the low torque explosive power of motor.The speed of motor easily exceeds 15000 RPM, and the limit of gasoline engine is mostly within 7000 RPM, and the speed limit varies greatly.However, the biggest advantage of motor is high efficiency. The loss of electric energy into mechanical energy is less than 5%, while the loss of internal combustion engine into mechanical energy is close to 70% on average.The internal combustion engine wastes too much and the motor rarely wastes, so even if the plug-in hybrid car is mainly driven by the motor and supplemented by the internal combustion engine, the fuel consumption of 2.0T PHEV can be as low as six or seven liters per hundred kilometers.Horsepower to mass ratio can be used to roughly judge the power standard.Horsepower refers to “PS- metric horsepower”, the standard is 75 kg force;Mass refers to the spare mass of a car, which is the weight of an empty car plus a tank of fuel.One ps can drive 75 kilograms of an object to a meter per second, so 150 kilograms of mass will be half as fast, and double the horsepower will be twice as fast.That is to say horsepower size and “quality discretion” can decide performance strong or weak directly, horsepower quality ratio can serve as the reference of judging power, also can call for “push weight ratio”.Consider a few cars: 1. Trumpchi Shadow Leopard, which is the fastest car to accelerate under 100,000 yuan.The maximum horsepower is 177PS (130kW ×1.36), the maximum weight is 1400kg, and the thrust-to-weight ratio is 126Hp/T.This result should be able to do about 7.5 seconds of 100 km acceleration, even if some should break through 8 seconds, and shadow leopard measured results are just the same.2. Nissan Henyi, this is a “negative textbook”, its 1.6L NA engine maximum horsepower as low as 135PS, the highest weight of 1306kg, thrust-to-weight ratio as low as 103Hp/T;In theory this is can complete hundred km within 10 seconds, but sylphy USES is the low efficiency of step-less transmission (transmission loss big/influence power and fuel consumption), and hundreds of kilometers acceleration is only in 12 seconds, so in esteem than to see a more comprehensive transmission, CVT is poor, dry dual-clutch also do not want to choose.3. Malibu XL 550T (2.0t), the maximum horsepower 237PS, the weight of 1525kg, the maximum thrust-to-weight ratio 155Hp/T, acceleration should be about 7.0 seconds;The actual results are also in this range, which indicates that the reference value of parameters and the standard of AT transmission are acceptable.The second is the regret of the front drive, the front drive acceleration center of gravity moved back, the front wheel power loss increased, if it is the rear drive, the power will be stronger.4. BMW 3 Series 330iM (high power version), maximum horsepower 258PS, trim weight 1610kg, thrust-to-weight ratio of 160Hp/T, should be able to break 7 seconds;Also, the 3 Series is rear-driven and should have better acceleration, so the 330iM of the 3 series should be able to break 7 seconds, but it’s not realistic to go faster.5. Dynasty · Han DM-P has a maximum horsepower of 436PS, a ready weight of 2020kg and a thrust-to-weight ratio of 215Hp/T, which is already the standard of super sports cars and should be within five seconds in theory;The real car Han DM-P can achieve 4.6 seconds, of course, this is also directly related to its full-time four-wheel drive system.At the same time, the EV mode of this car is rear rear drive (motor driven), thrust-to-weight ratio is 121Hp/T, and the acceleration performance is only about 8 seconds, but there is no problem to meet the load. The high-performance mode is oil-electric hybrid all-time four-wheel drive.Through these cars to feel it, you can also calculate.Edit: Tianhe Auto- Auto science Island and MCN published, copyright reserved like our content please like attention oh