US 12,404,818 B2
Apparatus and method for injecting a pilot fuel into an internal combustion engine
Sandeep Munshi, Delta (CA); Michael C. Wickstone, North Vancouver (CA); Jian Huang, Surrey (CA); and Ashish Singh, Surrey (CA)
Assigned to HPDI Technology LP, Vancouver (CA)
Appl. No. 18/575,165
Filed by HPDI TECHNOLOGY LIMITED PARTNERSHIP, Vancouver (CA)
PCT Filed Jun. 29, 2022, PCT No. PCT/CA2022/051042
§ 371(c)(1), (2) Date Dec. 28, 2023,
PCT Pub. No. WO2023/272392, PCT Pub. Date Jan. 5, 2023.
Claims priority of provisional application 63/216,515, filed on Jun. 29, 2021.
Prior Publication US 2024/0318608 A1, Sep. 26, 2024
Int. Cl. F02D 41/38 (2006.01); F02D 35/02 (2006.01); F02D 41/00 (2006.01); F02D 41/40 (2006.01)
CPC F02D 41/3827 (2013.01) [F02D 35/023 (2013.01); F02D 41/0027 (2013.01); F02D 41/401 (2013.01)] 19 Claims
OG exemplary drawing
 
1. A method of operating a gaseous fuelled direct injection diesel cycle internal combustion engine, comprising
introducing a quantity of gaseous fuel directly into a combustion chamber-of said engine, wherein said gaseous fuel comprises at least 60% hydrogen by volume at standard temperature and pressure,
introducing a quantity of pilot fuel directly into said combustion chamber of said engine, such that the quantity of pilot fuel has a pilot energy ratio of less than 1% and greater than 0.26% of a total fuel introduced for at least one engine operating condition; and
igniting said pilot fuel whereby combustion of said pilot fuel triggers the ignition of said gaseous fuel; and said engine maintains good ignition stability of the gaseous fuel for the at least one engine operating condition;
wherein over an entire engine operating map said pilot fuel is on average between 0.26% and 3% of the fuel that is consumed by said engine on an energy basis.