Tell me about some situations of modifying CNG vehicles?

I would like to know some information about the modification of CNG vehicles. For example, how is the development of CNG vehicles? What are the advantages? How much fuel and maintenance costs can be saved? How is the power after the change? Is it troublesome? Thanks! I would like to know some information about the modification of CNG vehicles. For example, how is the development of CNG vehicles? What are the advantages? How much fuel and maintenance costs can be saved? How is the power after the change? Is it troublesome? Thanks! 1. Emission performance: As a gaseous fuel, natural gas mixes more evenly with air, burns more fully, and emits less harmful substances such as CO and HC; some other harmful components that are not controlled by emission regulations (such as those that have an impact on the regional environment) It also contains less toxic substances, smoke, acidic substances, etc. than gasoline and diesel. Among all hydrocarbon fuels, natural gas has a smaller carbon-to-hydrogen ratio, with a carbon-to-hydrogen ratio of 4:1, and its CO2 emissions are about 25% less than gasoline. It is beneficial to protect the global environmental quality. Based on this characteristic of natural gas, developed countries have identified natural gas as a truly clean fuel and promoted its use. 2. Economical: Maintenance cost: Natural gas does not dilute lubricating oil and does not accumulate any residue after combustion. Carbon can reduce engine wear, extend the lubricant replacement cycle, reduce maintenance costs, and extend engine life; fuel cost: calculated based on 1 cubic meter of natural gas equivalent to 1.1 liters of gasoline, using CNG as vehicle fuel can reduce fuel costs by more than 50%. , can greatly reduce fuel costs 3. Power: The current CNG vehicle is basically a dual-fuel vehicle with a CNG system added to a gasoline vehicle. The engine's compression ratio, ignition system, air intake system, etc. have not changed. Using CNG The performance of natural gas is not fully utilized; the theoretical air-fuel ratio of natural gas is 10:1. When entering the engine, natural gas will occupy about 10% of the volume space, resulting in a reduction of about 10% in the amount of air sucked into the engine, and a decrease in air intake efficiency, thus Causes a decrease in power; natural gas has stable properties, slow burning speed, and requires more energy to ignite; compared with using gasoline, the power when using CNG decreases by about 15%. 4. Safety: The design of each component of the system. , production and inspection fully consider safety: gas storage bottles must be produced by designated professional manufacturers; the pressure-bearing capacity of gas storage bottles is several times the working pressure of CNG; each gas storage bottle must be inspected before leaving the factory; gas storage The bottle is equipped with a safety valve and a manual stop valve to ensure safe use and easy maintenance; the pressure reducer is equipped with a safety valve to ensure safety in the event of system failure; natural gas has stable properties, low density, and high auto-ignition temperature. It is safer than gasoline fuel. Domestic and foreign experience shows that the safety accidents caused by CNG systems are much lower than those of gasoline and diesel vehicles. 5. Driving range: Compressed storage of natural gas has low energy density for the same volume. The driving range of the storage container is only equivalent to 1/4 of gasoline, and the weight of the storage container is large, resulting in an increase in the weight of the vehicle. For small cars, the limitation of the increase in weight and the limited space on the vehicle are taken into consideration when designing. Excessive natural gas storage bottles are not allowed to be installed, and the driving range using natural gas is less @2019