The reason for this topic is that in the previous year, we have seen a lot of riders discussing the power performance of some gasoline-electric hybrid cars. In their view, some of the current "extended range hybrid" power data looks "very unremarkable", and the continuous power generation power is only between 60 and 80Kw, which is basically less than 100 horsepower.
Such a weak power, open up is not meat dead? On the other hand, the old drivers have been warning us: "There is no meat car, only meat man"! ——So is the power of 60~80Kw in a car enough, and what kind of power data is the real meat? Let's unravel the mystery together!
At least 100 horsepower per ton is enough?
Start with "simple tons of power"
There is a "talk of experience" circulating in the circle of car play: if a car can make the driver feel full of power, then its "power per ton" needs to reach 73.5Kw/ ton (equivalent to 100 horsepower / ton). In the case of a 1.5-ton sedan (almost the weight of an A+ class or an entry-level B-class sedan, which is the most common on the road at present), the engine power needs to have 150 horsepower to ensure basic power performance.
Is this true? —— Let's start with the concept of "unit ton of power": for example, if a car weighs 2 tons and the engine power is 200Kw, then the power of "average to every ton" is obviously 100Kw. Converted into "horsepower" is 136 horsepower. Remember a rough conversion formula: 1 Kw≈ 1.36 horsepower.
So how is the weight of the car calculated? The weight of a car is divided into two different definitions: "curb weight" and "total mass at full load". The most popular saying "maintenance quality" refers to: in the empty car state, the fuel tank is full of the weight of the whole car; and the "full load total mass" is the full weight of a car after the fuel tank is filled with oil, the whole car is filled with "200 pounds of fat", and then the trunk is stuffed with things.
Trucks only need "10 hp per ton"
It's still running at high speed
And the "power per ton" of the car must be calculated with "full load total mass"! Therefore, the saying that "the weight of the empty car is distributed by 100 horsepower per ton" is obviously not rigorous enough! ——So how much is the "power per ton" of the car to be "enough"? In the professional field, we need to look at it in terms of the type of vehicle. Different types of cars require different "unit tons of power".
Internationally, it is usually stipulated that the unit power of the car is greater than 5KW/ton. In fact, the minimum required indicator is 6KW/ton (heavy trucks, big buses and other fields). For example, the maximum full load total mass of Continental heavy trucks is stipulated at 49 tons, and according to the calculation of 6KW/ton, 294Kw of diesel engine power is required. Equivalent to 400 horsepower.
In Italy, as well as mountainous areas such as the southwest of the continent, considering the climb, it is hoped that the vehicle can have a 7.5kw/ton indicator, calculated according to 49 standard tons, the maximum is 367.5 kilowatts of power demand, equivalent to 500 horsepower. In fact, the "European" heavy trucks of 400 to 500 horsepower diesel engines can be seen everywhere in the streets and alleys of the mainland. They can also speed at speeds of more than 100Km/h on the highway, not slow at all.
Family cars: "35 to 40 hp per ton"
Enough is enough!
For small motor vehicles, taking into account the acceleration indicators, usually the industry does not allow the unit ton of power to be less than 22Kw / ton, generally hope that the unit ton of power can reach more than 24kw / ton (for example, we calculate according to 26Kw / ton), for example: a small car empty weight (curb weight) 1.5 tons, the total load after full load is 2.2 tons, then 2.2 × 26Kw / ton = 58Kw (equivalent to 80 horsepower)
That is to say, such a small car, the engine rating reaches 58Kw, as long as the gearbox design is reasonable, then it can already meet the normal operation of various road surfaces, including climbing, acceleration, high speed and other working conditions. If you want the vehicle to get better dynamic indicators, then you need to further improve the power index per ton, such as to the 30Kw/ton level.
The old cars of the 90s are not much "ton power"
But in the hands of the old driver are running screaming
Also calculated according to the above-mentioned car with an empty load of 1.5 tons and a full load of 2.2 tons, the engine power required is 66.5Kw, equivalent to 90 horsepower. —— In today's 90 horsepower looks very LOW, but in the 90s of the last century, ordinary cars or SUVs, the engine power can have 90 horsepower, really is already burning incense!
The classic gods of the 90s," the "Square Santana" and the "Audi 100," use the famous Volkswagen EA113 cast iron locomotive with a maximum power of only 70Kw, but they do not run slowly in the hands of the old driver. Instead, at countless intersections, old drivers used it to wipe out countless more powerful private cars at intersections...
Human obsession with power,
The consequence is to make us pay more money
Regarding the concept of "unit ton of power", I think I have said it thoroughly enough at this point. Here's a little joke for everyone: a half-trailer driver asked a Rolls-Royce driver, your car consumes 30 tons of fuel per 100 kilometers, my car pulls dozens of tons, and the fuel consumption is also 30 or so, why is your car so expensive?
The Rolls-Royce driver weakly replied, daring to ask your car to accelerate from stationary to 100 kilometers per hour, can it be done in 5 seconds? The truck driver was speechless... As a result, the truck driver's wife was fast-headed, and came up to make up the knife: you let Rolls-Royce also pull dozens of tons, and then compare with the truck to see who is faster?
Sometimes, we're too obsessed with the power of the car. You know, the power of the car is actually related to the "3 power" of the car speed. The Deluxe S-Class costs about 180 horsepower when running at 200 km/h and about 400 hp at a Porsche 911 at 300 km/h; but is that really what the average family scooter needs?
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