Description:Complete Specification

The following specification describes and ascertains the nature of this invention and the manner in which it is to be performed.
Field of the invention
[0001] This invention relates to an algorithm for detecting hydrogen gas leakage, and more particularly to the algorithm for detecting hydrogen gas leakage from a high-pressure rail with injectors of a hydrogen engine.

Background of the invention
[0002] CN 218151179 U describes a hydrogen pipeline for a direct injection type hydrogen internal combustion engine. The utility model relates to a hydrogen pipeline for a direct injection type hydrogen internal combustion engine, which relates to the field of internal combustion engines and comprises a housing, a hydrogen injector arranged in the housing, a hydrogen common rail pipe arranged on the outer side of the housing and a hydrogen pipeline component penetrating through the housing and connected with the hydrogen injector and the hydrogen common rail pipe. The hydrogen pipeline assembly is hermetically connected with the housing. According to the utility model, pipeline direct connection is adopted, the number of parts is reduced, the number of interfaces is reduced, and the risk of hydrogen leakage is reduced.

Brief description of the accompanying drawing
[0003] Figure 1 illustrates an algorithm for detecting hydrogen gas leakage from a high-pressure rail with injectors of a hydrogen engine in one embodiment of the invention.

Detailed description of the embodiments
[0004] Figure 1 illustrates an algorithm 100 for detecting hydrogen gas leakage from a high-pressure rail of a hydrogen engine. The algorithm 100 comprises determining 110 if a vehicle is in a switched off condition, determining 120 a pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at a first time, and determining 130 a pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at a second time. The algorithm further comprises determining 140 if the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the second time is lesser than the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the first time, and identifying 150 an internal leakage in the high-pressure rail of the hydrogen engine if the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the second time is lesser than the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the first time.

[0005] Figure 1 illustrates an algorithm 100 for detecting hydrogen gas leakage from a high-pressure rail of a hydrogen engine. The algorithm 100 comprises determining 110 if a vehicle is in a switched off condition. More specifically, the electronic control unit determines if the vehicle is in the switched off condition. Once the electronic control unit determines that the vehicle is in the switched off condition, the electronic control unit determines 120 a pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at a first time after determining 110 that the vehicle is in the switched off condition. Therein, the electronic control unit determines 130 a pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at a second time that occurs after a time interval in which the electronic control unit determines 120 the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the first time.

[0006] The algorithm 100 further comprises determining 140 if the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the second time is lesser than the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the first time by the electronic control unit. If the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the second time is lesser than the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the first time by a threshold limit, the electronic control unit identifies 150 an internal leakage in the high-pressure rail of the hydrogen engine. If the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the second time is not lesser than the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the first time by the threshold limit, the electronic control unit identifies no internal leakage in the high-pressure rail of the hydrogen engine.

[0007] The algorithm 100 for detecting hydrogen gas leakage from the high-pressure rail of the hydrogen engine further comprises determining 160 a pressure of hydrogen gas in an inlet manifold of the hydrogen engine at the first time by the electronic control unit. Therein the electronic control unit determines 170 the pressure of hydrogen gas in the inlet manifold of the hydrogen engine at the second time. If the electronic control unit determines 180 that the pressure of hydrogen gas in the inlet manifold of the hydrogen engine at the second time is lesser than the pressure of hydrogen gas in the inlet manifold of the hydrogen engine at the first time by a threshold limit, the electronic control unit identifies 190 an internal leakage in the high-pressure rail of the hydrogen engine. If the pressure of hydrogen gas in the inlet manifold of the hydrogen engine at the second time is higher than the pressure of hydrogen gas in the inlet manifold of the hydrogen engine at the first time by the threshold limit, the electronic control unit identifies no internal leakage in the high-pressure rail of the hydrogen engine.

[0008] It must be understood that the embodiments explained above are only illustrative and do not limit the scope of the disclosure. Many modifications in the embodiments with regard to dimensions of various components are envisaged and form a part of this invention. The scope of the invention is only limited by the scope of the claims.
, Claims:We Claim

1. An algorithm (100) for detecting hydrogen gas leakage from a high-pressure rail of a hydrogen engine, the algorithm (100) comprising:
determining (110) if a vehicle is in a switched off condition;
determining (120) a pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at a first time;
determining (130) a pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at a second time;
determining (140) if the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the second time is lesser than the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the first time; and
identifying (150) an internal leakage in the high-pressure rail of the hydrogen engine if the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the second time is lesser than the pressure of hydrogen gas in the high-pressure rail of the hydrogen engine at the first time.

2. The algorithm (100) for detecting hydrogen gas leakage from a high-pressure rail of a hydrogen engine in accordance with Claim 1, further comprising:
determining (160) a pressure of hydrogen gas in an inlet manifold of the hydrogen engine at a first time;
determining (170) a pressure of hydrogen gas in the inlet manifold of the hydrogen engine at a second time;
determining (180) if the pressure of hydrogen gas in the inlet manifold of the hydrogen engine at the second time is higher than the pressure of hydrogen gas in the inlet manifold of the hydrogen engine at the first time; and
identifying (190) an internal leakage in the high-pressure rail of the hydrogen engine if the pressure of hydrogen gas in the inlet manifold of the hydrogen engine at the second time is lesser than the pressure of hydrogen gas in the inlet manifold of the hydrogen engine at the first time.