Since the launch of the first gasoline car in 1886, the fuel car has come more than 120 years. Over the years, the various technologies of the automotive industry have been rapidly advancing, and the measurement technology of fuel consumption of automobiles has been slow and even has stalled.
There are three reasons for this:
First, the pulsating fuel supply process of the engine makes the frequency response of the fuel consumption sensor unsatisfactory, resulting in a large frequency error.
Second, the fluidity of fuel oil is affected by the ambient temperature and the fuel grade, which will produce a large liquid error.
The third is that the car is finally switched between idle (micro flow), acceleration (high flow), medium and high speed (general flow) and other operating conditions, requiring a wide range of sensors, and the manufacture of such sensors is a worldwide problem.
In view of this, there are three types of real-time measurement of vehicle fuel consumption:
The first type of products originate from abroad. It is characterized by a complex structure and high prices. A unit worth several hundred thousand yuan is only suitable for research institutes, universities, or energy-saving product R&D units.
The second type of product is the method for calculating the fuel injection data. In some cars with an EFI engine, when the fuel injection stroke is adjusted before the engine is shipped, the calibrated fuel consumption, the relationship between the engine speed, the vehicle speed, and the fuel consumption are input to the computer in advance. When the car is running, the computer calculates the instantaneous fuel consumption and cumulative fuel consumption based on the engine speed and vehicle speed. Because the engine calibration is performed on the gantry and does not fully reflect the actual condition of the vehicle, this measurement result can only serve as a reference value for fuel consumption.
The third type of product is a commonly used fuel consumption measurement method in China. Its characteristics are simple structure, can not compensate for the errors caused by changes in temperature, viscosity, pulsation, frequency response, range, etc., can not meet the accuracy, error and stability required for automobile fuel consumption testing, and can only be used as a measure of fuel consumption trends. There are: oil dipstick measurement method, liquid level sensor measurement method (oil meter reading), dual sensor measurement method (into the oil to reduce oil measurement), gas station fuel metering method.
The fuel consumption of automobiles is the most important indicator for evaluating the economic performance and overall cost performance of automobiles, and is also the most important indicator for evaluating the effect of energy conservation and emission reduction of automobiles. Especially in industries such as public transport, freight transportation, passenger transport, and construction machinery, fuel costs have accounted for 60% of the total operating costs. Accurately measuring the fuel consumption of automobiles has important significance and effect on the cost control of enterprises, the improvement of the operating skills of drivers, and the implementation of energy-saving and emission-reduction policies.