Reasons for Insufficient Power of LNG Vehicles on Uphill Roads
2 Answers
The main reason for insufficient power of LNG vehicles on uphill roads is insufficient fuel in the LNG cylinder. Below are other reasons and solutions: 1. Insufficient fuel in the LNG cylinder: The minimum remaining amount of LNG should not be less than 50L; otherwise, it needs to be replenished in time. 2. The LNG cylinder valve is not fully opened: If the LNG cylinder valve is not fully opened, similar to a blocked fuel supply line in a diesel engine, it will cause poor fuel supply. First, carefully check whether the manual liquid outlet valve is fully opened; otherwise, the valve needs to be reopened correctly. 3. The pressure in the cylinder and buffer tank is too low: If the pressure in both the cylinder and buffer tank is below 0.8Mpa, it will result in poor fuel output from the cylinder. In this case, it is necessary to check whether the manual pressurization valve of the LNG cylinder and the manual valve (or vent valve) on the gas phase circuit are fully opened.
I've been driving LNG trucks for long-distance freight for three years, and lack of power when climbing hills is all too common. It's especially noticeable when the gas cylinder pressure can't build up—stepping on the accelerator feels like stepping on cotton. If the boost valve fails, power drops by 30% instantly, and you need the repair shop to check the fault codes with a computer. Air intake system leaks are even worse—just a loose clamp can make the truck sluggish. Last time my truck suddenly lost power, it turned out the exhaust brake was stuck in a semi-engaged state, choking the engine with trapped exhaust. Driving on plateaus requires extra attention to altitude compensation—the ECU needs recalibration. If you've just refueled with low-calorific-value gas before a climb, even flooring the pedal won't get the RPM up. These tricks are well-known among veteran drivers.
