FAW Truck Export CNG Model Gas Consumption Calculation Guide: Helping Overseas Users Accurately Control Operating Costs
In recent years, FAW Trucks' CNG (Compressed Natural Gas) models have been gaining increasing recognition in the overseas logistics and transportation market due to their core advantages of economy and environmental friendliness, becoming the preferred equipment for many overseas users to reduce operating costs. As a key indicator measuring the operational efficiency of CNG models, accurate gas consumption calculation is of great significance for overseas users' cost accounting and route planning. Combining industry standards and the technical characteristics of FAW's exported CNG models, this article details the core methods and practical key points of gas consumption calculation for overseas users.
It is understood that all FAW's exported CNG models comply with the national standard JT/T 1411-2022 "Limits and Measurement Methods for Fuel Consumption of Natural Gas Commercial Vehicles", which provides an authoritative basis for gas consumption calculation. Different from fuel-powered models, CNG models have two common measurement methods for gas consumption: volume (cubic meters) and mass (kilograms). Overseas users can flexibly choose the calculation logic according to the pricing unit of local gas stations (some regions charge by cubic meter, while others charge by kilogram).
Core Calculation Logic: Basic Data and Core Formulas Are Indispensable
The core of gas consumption calculation for FAW's exported CNG trucks lies in obtaining accurate basic data, and then deriving the 100km gas consumption value through standard formulas. The core basic data includes cylinder parameters, gas filling/residual pressure, and actual driving mileage. The specific calculation needs to be carried out in two steps.
Step 1: Calculate the Actual Natural Gas Consumption
First, it is necessary to calculate the total actual natural gas consumption during vehicle operation through cylinder parameters and pressure changes. The core formula is derived based on the gas state equation and is applicable to all types of FAW's exported CNG models:
1. Natural gas volume consumption (cubic meters) = Total cylinder volume (liters) × Pressure change value (MPa) × 10 ÷ 1000
2. Natural gas mass consumption (kilograms) = Volume consumption (cubic meters) × Natural gas density (0.716 kilograms/cubic meter)
Key notes: The standard working pressure of cylinders for FAW's exported CNG models is usually 20MPa (200 atmospheres). The total cylinder volume can be queried through the vehicle technical manual (for example, a certain exported tractor unit is equipped with an 8×120L + 4×80L cylinder group, and the total volume is 1280 liters); Pressure change value = Pressure after full gas filling (usually calculated as 20MPa) - Residual pressure after driving (can be read through the cab dashboard).
Example: The total cylinder volume of a FAW exported CNG tractor unit is 1280 liters. After being filled with gas to 20MPa and driven, the residual pressure is displayed as 5MPa. Then the volume consumption = 1280 × (20-5) × 10 ÷ 1000 = 192 cubic meters, and the mass consumption = 192 × 0.716 ≈ 137.47 kilograms.
Step 2: Derive the 100km Gas Consumption Value
100km gas consumption is a core indicator measuring the vehicle's gas consumption level. The calculation formula is:
1. 100km gas consumption (cubic meters/100km) = Actual volume consumption (cubic meters) ÷ Actual driving mileage (kilometers) × 100
2. 100km gas consumption (kilograms/100km) = Actual mass consumption (kilograms) ÷ Actual driving mileage (kilometers) × 100
Combined with the above example, if the actual driving mileage of the tractor unit is 400 kilometers, then the 100km gas consumption (volume) = 192 ÷ 400 × 100 = 48 cubic meters/100km, and the 100km gas consumption (mass) = 137.47 ÷ 400 × 100 ≈ 34.37 kilograms/100km.
Practical Key Points: These Details Affect Calculation Accuracy
Overseas users need to pay attention to the following details in the actual calculation process to ensure accurate results: First, the cylinder pressure should be read after the vehicle is turned off and the cylinder temperature is stable to avoid the impact of temperature changes on the pressure value; Second, natural gas cannot be completely exhausted, and a residual pressure of about 5MPa should usually be reserved (gas should be refilled when it is lower than 2MPa). The actual residual pressure should be used in the calculation, and the full cylinder pressure cannot be used to calculate the consumption in full; Third, the driving mileage is recommended to be accurately recorded through the vehicle odometer to avoid estimation errors.
It is worth noting that the gas consumption performance of FAW's exported CNG models has a clear reference benchmark. Taking the popular exported model Jiefang J6P 6SM6 gas-powered tractor unit as an example, its equipped CA6SM6 engine has improved the comprehensive gas-saving effect by 3% through precise combustion control and vehicle drag reduction technology. In actual operation, the average 100km gas consumption (mass) is about 29.5 kilograms, and the minimum can reach 26 kilograms. Overseas users can compare their own calculation results with this benchmark to find abnormal gas consumption in a timely manner.
Extended Reference: Quick Conversion Between Gas Consumption and Operating Costs
For overseas users who focus on cost control, the per-kilometer gas cost can be quickly calculated through the gas consumption value: Per-kilometer gas cost = 100km gas consumption × Local natural gas unit price ÷ 100. For example, if the local CNG unit price is 3.5 yuan/cubic meter and the vehicle's 100km gas consumption is 48 cubic meters, then the per-kilometer cost = 48 × 3.5 ÷ 100 = 1.68 yuan.
Relevant technical person in charge of FAW said that the gas consumption of exported CNG models is greatly affected by factors such as road conditions (highway/suburb/mountainous area), load, and driving habits. It is recommended that overseas users develop the habit of smooth driving and avoid sudden acceleration and braking, which can effectively reduce gas consumption by about 10%. At the same time, FAW provides exclusive technical manuals for overseas users, including the gas consumption reference range and optimization suggestions for various exported models. Users can obtain them through local service outlets.
With the upgrading of demand for environmentally friendly transportation equipment in the overseas market, FAW Trucks will continue to optimize the energy-saving technology of CNG models, and at the same time provide users with more comprehensive gas consumption accounting and operation guidance services to help overseas users achieve cost reduction and efficiency improvement.
By:Curry
WhatsApp:+86 17753244065
