The fact 20 Isuzu long wheelbase vehicles can use CNG underscores a significant advancement in fuel options for truck fleets. Fuel consumption is the largest operational cost for any truck fleet. Integrating a Compressed Natural Gas - Diesel Dual Fuel (CNG-DDF) system for these Isuzu models places them at a competitive edge in the fluctuating fuel market.
This approach offers reliable, cost-effective, and consistent mobility solutions. The automotive industry widely acknowledges the use of CNG, with approximately 14 million Natural Gas Vehicles (NGVs) operating across 80 countries.
CNG is a different technology unlike LPG, commonly associated with applications such as flame-grilled steaks.
Over the past five years, Isuzu Motors South Africa (IMSAf) has been testing CNG-DDF converted trucks, demonstrating their reliability. CNG, short for Compressed Natural Gas, primarily consists of methane, while LPG, or Liquified Petroleum Gas, comprises propane and butane. While CNG is a viable alternative to petrol and diesel in vehicles, LPG finds use in industrial, refrigeration, agricultural, and catering sectors.
Notably, CNG is lighter than air, dispersing quickly in case of a leak, and posing a lower ignition risk compared to LPG, which can spread on the ground and ignite more easily. CNG's lower carbon content also results in fewer carbon monoxide and carbon dioxide emissions, making it a safer and more environmentally friendly option.
In the quest for greener fleet operations, CNG offers numerous benefits. It significantly reduces the carbon footprint by emitting 20%-25% less greenhouse gases and virtually no toxic pollutants. Other advantages include reduced particulate emissions, quieter engine operation due to smoother combustion, lower fuel consumption, diminished fuel theft and adulteration, fewer engine carbon deposits and improved engine oil quality.
Operating the Isuzu CNG-DDF system is straightforward, retaining the standard diesel engine configuration with a 100% diesel fallback option. A simple button press switches between Dual Fuel mode (Diesel/Gas mixture) and 100% Diesel mode, with automatic reversion to diesel when the natural gas cylinder is empty or if the CNG system detects a fault. The system boasts quick gas filling times compared to the lengthy charging required for electric trucks, although driver training remains necessary.
Engine performance and efficiency remain consistent in Dual Fuel mode, with engine torque and power nearly unchanged, ensuring unaffected trip times. A special engine control unit determines the optimal gas/diesel fuel mixture, maintaining similar torque and power levels.
From a safety perspective, CNG is advantageous as it disperses harmlessly into the atmosphere when leaked, aided by an added odorant for easy detection. It has a narrow flammability range (5%-15%) compared to petrol (1%-8%), and its safety record is statistically superior to conventional fuels. Additionally, CNG is non-toxic.
Considering the volatile diesel fuel prices, with coastal rates at 21,91/litre and a 400-litre tank costing nearly R8 800, along with global oil market uncertainties, adopting CNG becomes a strategic decision beyond mere cost considerations.
However, the distribution network for CNG remains a challenge, with availability currently limited to the Gauteng region. Municipalities represent an ideal application for CNG due to environmental benefits, reduced fuel consumption, anti-theft advantages, and centralized refilling. The CNG gas cylinders, while adding to the vehicle's tare mass and reducing payload, do not affect the Gross Vehicle Mass (GVM) and Gross Combination Mass (GCM).
The ability to fit CNG-DDF systems as an option on 20 Isuzu long wheelbase models significantly benefits fleet replacement planning. Tools like the TruckScience Axle Weight Calculator, available at TruckScience.com, help understand the weight implications of CNG equipment and calculate payload capacity effectively.
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