Will diesel cars be more fuel efficient than gasoline cars of the same displacement?

Diesel and gasoline fuels are different in nature.

1.Diesel compression ratio is high, for the same cylinder, gasoline and diesel consumption, because diesel compression is more complete, in a stroke, diesel burns longer and more fully (which can be understood as pushing the piston movement trajectory longer), so the efficiency is higher, which is why diesel tachometer is lower than gasoline.

2.Diesel is direct injection in the cylinder, which can be directly compressed and ignited by cylinder compression, and how much is sprayed with gasoline, while gasoline is unstable, and it needs to be mixed with air in a certain proportion before entering the cylinder, and then ignited in the cylinder, because the proportion is placed there, no matter how much is used, it is mixed so much, so the fuel economy is low. If you look at the enthalpy entropy curve, one is isochoric combustion and the other is isobaric combustion.

No, this needs to be determined according to the kinetic energy of the car, not all diesel cars will be very fuel-efficient, which has no scientific basis.

Yes, because it often does not need to consume too much diesel when it is used, and the ** of diesel is relatively low, it is also very convenient when using it, and it will not produce waste.

In terms of fuel consumption, owners who have used diesel vehicles say that diesel vehicles are very fuel-efficient, while gasoline vehicles are more fuel-efficient than diesel vehicles of the same displacement, and diesel vehicles of the same level will be about 30% more fuel-efficient than gasoline vehicles.

Diesel vehicles are more fuel-efficient than gasoline vehicles, which is determined by the technical characteristics of the engine, because the compression-ignition diesel engine has a higher energy conversion ratio than the ignition gasoline engine, and the energy consumption is 45%-60% of the gasoline engine; The fuel consumption of a liter electronically controlled common rail turbocharged diesel engine is comparable to that of a liter of electronically controlled gasoline engine.

The low-speed torque of the diesel engine is greater than that of the gasoline car, and in the case of the same displacement, the diesel car will feel the power of the diesel car when starting and climbing.

Compared with gasoline vehicles with the same displacement, diesel engine CO2, CO, HC emissions are lower, NOx and particles are higher, through technical improvement, CO2 emissions are about 25% lower, NOx and particles are more than 98% lower than the old type, and the greenhouse effect of diesel engine emissions is 45% lower than that of gasoline

It should be noted that modern diesel engines must be matched with clean diesel to fully exert energy saving and emission reduction effects. In short, poor oil does increase environmental pollution.

There are several factors that must be considered when buying a diesel or petrol car.

1. In the past 7-8 years, the average annual increase in fuel ** is about 11%. In the next 5 years, oil prices should increase by an average of 11%-15%.

2. In the standard use of 100,000 kilometers in 5 years, the maintenance cost of diesel vehicles and gasoline vehicles (that is, the cost of ordinary maintenance such as oil change and filter element change) is basically the same. Some say diesel is more expensive, some say diesel is cheaper. It's hard to say, anyway, after 5 years, the total maintenance cost will vary by up to 2,000 yuan, with an average of 400 yuan per year.

3. The purchase cost of diesel vehicles is about 10,000 yuan on average. Then the price of this car is more expensive when purchasing, a one-time purchase tax, and an annual insurance cost. This cost will be 2,500 yuan more expensive in 5 years. On average, it costs 500 yuan a year.

4. Diesel vehicles and gasoline vehicles are more fuel-efficient than gasoline vehicles under various road conditions. It is generally believed that diesel vehicles are 30% more fuel-efficient than gasoline vehicles under comprehensive road conditions. In other words, if the comprehensive fuel consumption of a gasoline vehicle is 12, then the comprehensive fuel consumption of a diesel vehicle is.

Gasoline vehicles cost more fuel than diesel vehicles of the same displacement, and diesel vehicles of the same level will save about 30% of fuel compared with gasoline vehicles.

Diesel vehicles are more fuel-efficient than gasoline vehicles, which is determined by the technical characteristics of the engine, because the compression-ignition diesel engine has a higher energy conversion ratio than the ignition gasoline engine, and the energy consumption is 45%-60% of the gasoline engine; The fuel consumption of a liter electronically controlled common rail turbocharged diesel engine is comparable to that of a liter of electronically controlled gasoline engine.

Which is more fuel-efficient, diesel or gasoline, needs to be decided according to the model and displacement, not necessarily which is more fuel-efficient.

A gasoline engine is a type of spark ignition. When the mixed gases in a gasoline engine ignite, they are immediately burned and energy is produced. Therefore, for high-speed high-power outputs, multiple cycles per unit time can be repeated.

As a result, it's small and lightweight, allowing for higher performance and responsiveness, while a wide speed range for better handling. Diesel vehicles have obvious advantages in power and economy, but many consumers will still choose gasoline vehicles. Owners who have used diesel vehicles say that diesel vehicles are very fuel-efficient, while gasoline vehicles are more fuel-efficient than diesel vehicles of the same displacement.

The diesel engine is compression-ignition type, that is, the temperature in the cylinder is increased by compressing the air in the cylinder to reach the ignition point of the diesel engine, which determines that the starting conditions of the diesel engine at low temperature and low pressure are more stringent than those of the gasoline engine with spark plugs, and it is generally difficult to start.

Diesel-powered cars. If you ask about the steaming diesel cars that drove on the road in the last century, you have nothing to say. Today's green diesel cars emit cleaner and more environmentally friendly exhaust gases than gasoline vehicles. As a result, European automakers have launched their own diesel versions.

Fuel-saving: Mainly diesel engine, because it is compression-ignition, diesel engine is lean burn under most working conditions, except for large cargo conditions. Torque:

Diesel engines dominate. The diesel engine has a long range and the highest volumetric calorific value of the diesel engine, which makes the diesel engine more torque. Responsibilities:

The diesel engine has excellent performance. Diesel engines do not accelerate. The accelerator pedal directly controls the fuel injection.

As soon as you step on the accelerator, the power is on.

8% discount. I almost sold the car. Again, the Tucson transmission, or the Hyundai car, drops every time the speed drops to 50, and then regrets the speed to more than 2,000.

But it feels like stepping on the brakes. It's not huge, but someone pulled it back.

The problem is that the main brands of Chinese cars are all gasoline-powered vehicles. Due to the inapplicability of the quality of domestic diesel, few diesel vehicles can be used. Most diesel cars are trucks or long-distance buses!

A diesel car with the same displacement is better than gasoline because the gasoline engine is better, which is different from a diesel car. Gasoline vehicles of the same displacement have high power. The power of the gasoline car is high, fast and quiet, but the diesel car has high torque, a strong start, and the displacement is very obvious.

Engine diesel with the same displacement is more powerful than gasoline, and starting diesel also has an advantage, but high-speed diesel cars are not as good as gasoline cars. In terms of maintenance, ordinary diesel engines are relatively cheap.

In the case of the same displacement, the more power is of course, the better, some car manufacturers use advanced technology, such as intake valve stroke control, EGR, 5 valves, etc., the increase in power is inevitable, but at the same time, this means an increase in engine costs. The engine selected by the manufacturer for a certain model is actually to find a balance between power, economy, emissions and cost.

1) "Vehicle" means motor vehicle and non-motor vehicle.

2) "Motor vehicle" refers to a wheeled vehicle that is driven or towed by a power unit and driven on the road for personnel or for transporting goods and carrying out special engineering operations.

3) "Non-motorized vehicles" refers to vehicles driven by human or animal power and driven on the road, as well as motorized wheelchairs for the disabled, electric bicycles and other vehicles that are driven by power units but have a design maximum speed, empty mass and external dimensions that meet the relevant national standards.

The gasoline engine has strong explosive power, and the diesel engine has strong power;

Diesel is strong, but the speed is slow and the noise is high, and the gasoline has a strong explosive force, fast speed, and low noise.

Hope it helps!

Diesel vehicles have high energy utilization, and different working modes determine their torque and power output characteristics, and diesel vehicles have greater torque in the low-speed range.

1. Diesel has a higher energy density than gasoline.

2. The compression ratio of the diesel engine is higher and the thermal efficiency is higher.

3. The mixture concentration of the diesel engine is lower, and the compression ignition type is adopted; The mixture of gasoline engines is generally controlled in the standard concentration range, and ignition is carried out using spark plugs.

Diesel and gasoline engines are the two most common power units found in automobiles. Due to the different fuels, diesel and gasoline engines work in different modes. Because gasoline can burn more fully than diesel, diesel cars do not have spark plugs, diesel cars are faster than cars at low speeds, but diesel cars are not as good as gasoline cars at high speeds, and diesel cars are also noisy.

Do you prefer to drive a silent gasoline engine SUV or a diesel SUV that hums when it starts? Gasoline has a low boiling point and is easily vaporized as compared to diesel, whereas diesel has a low autoignition temperature.

Diesel engines use compressed air to raise the air temperature so that the air temperature exceeds the spontaneous combustion test of diesel. At this time, diesel, diesel spray and air are injected into the diesel engine, and the diesel spray is mixed with air and ignites on its own. Compared with the gasoline engine, the diesel engine has the advantages of low and good economy, and it has no ignition system, so there are fewer failures.

However, due to the high working pressure of the diesel engine, all related parts are required to have high structural strength and rigidity, so the diesel engine is large in volume and large in volume.

The manufacturing accuracy of the fuel injection pump and fuel injection nozzle of the diesel engine is high, so the cost is high; In addition, the diesel engine works roughly, and the vibration noise is large; Diesel does not evaporate easily, and it is difficult to start when the car is cold in winter. First of all, the injections are different. Generally, gasoline engines (except direct injection engines) mix gasoline with fuel and enter the cylinder, while diesel engines inject diesel directly into a cylinder filled with compressed air.

Different ignition methods. Gasoline engines require spark plugs to ignite the mixture, while diesel engines use compression ignition. The compression ratio is different.

The compression ratio of a diesel engine is generally larger than that of a gasoline engine, so its expansion ratio and thermal efficiency are higher, and the fuel consumption is lower than that of a gasoline engine. Suction stroke: the diesel engine sucks pure air; Gasoline inhales a mixture of air and gasoline.

Power stroke: The diesel engine injects high-pressure atomized diesel through the fuel injector, and spontaneously combustifies when encountering high-pressure and high-temperature compressed air; The engine ignites the compressed gasoline and air mixture through a spark plug. Therefore, diesel engines are more used in occasions that require low speed and high torque, such as trucks, ships, tanks, etc.

There is also a more important reason that diesel has a higher flash point than gasoline and is also safer than gasoline. Starting diesel cars are better than gasoline cars, and high-speed gasoline cars are better than diesel cars.

Because when refining, one ton of diesel can be refined into tons of gasoline, and at the same time, tons of diesel can be refined, so the output of diesel is more than that of gasoline, resulting in the lower production of diesel; Diesel vehicles are generally large trucks, coal trucks, earth-pulling trucks and semi-trailers, while gasoline vehicles are more of our family cars or cars.

Because the demand for diesel is relatively large, it is more commonly applied to places, and it is used to do some safety and security activities, and has a certain public welfare, so it will be cheaper; The price is different, the capacity is different, the range of use is different, the effect is different, and the places where you can go are different.

The reason is that diesel is more convenient to refine, and the output of diesel is about 2 times more than that of gasoline. The difference is that diesel vehicles focus on torque output and load more cargo; Gasoline cars focus on power delivery and run fast.