This time we did no have our own dual fuel solution so we decided to install Polish Blue Power dual fuel conversion kit. After one year of pilot testing average substitution coefficient was 20-30%, it did not satisfy both us and client. So we have installed our in-house developed dual-fuel conversion kit Triol.
| Engine | DC12, 6 cyl inline |
| Power | 380 HP |
| Axle configuration | 6х4 |
| Full weight | 44,000 kg |
Our tractor truck works at Moscow -Saint-Petersburg highroad, with 2 conveniently situated CNG fueling stations (Tver close to highroad at the middle almost, Petersburg close to highroad beginning and quite fortunately close to fleet base. There also 3 more CNG fueling station, one at Novgorod, 200km from Peterburg, 20km off and 2 more at Moscow ring road, huge traffic jams.
Average consumption when diesel only was 35L per 100km, with 60% of substitution new diesel consumption becomes 14L and CNG consumption 23nm3
We have 3 x 140L type 2 CNG cylinders installed behind the cabin in steel frame. Total weight with CNG full load is around 650kg, storage volume 100nm3 with 200 bar working pressure. So max mileage we got is 400km, which is not enough to run full distance between Petersburg and Tver (500km) in dual-fuel regime. Truck goes in diesel regime last 100km, but in week time we increase cylinders number up to 5, getting 600-700km mileage and full CNG coverage through all distance.
We have installed our quite standard Triol dual-fuel system with PPS (gas pedal) emulation ( description ). One new feature: detonation monitoring system installed for calibration period and removed later.
Please see pictures below:
2 tests were conducted, first with max container (10 concrete block 1 ton each at the bottom plus used tires up to the top = 20-24 tons load full weight) and second test without load, for standard full-load – coming back empty long haul cycle.
Test conditionsScania run round trip Krivko village – Petersburg 130km including hilly part 20km. All tests were performed with the same driver, at first diesel-only round, then dual-fuel round.Diesel fuel consumption was measured using calibrated pump. Before the round vehicle was fueled in full, then after the round it was fueled in full again and liters number became diesel consumption per round trip. CNG consumption was measured by pressure gauge and calculations using cylinders volume and temperature.
Dual-fuel test No 1, full load: 130 km consumption: 17L diesel + 31nm3 CNG, 62% substitution coefficient
Diesel test No 2, no load: 37L per 130km
Dual-fuel test No 2, no load: 130 km consumption: 15L diesel + 28nm3 CNG, 60% substitution coefficient
Driver reported no power losses or uneven torque, vehicle moved even and steady.