CN-116696544-B - Hydrogen fuel engine system, transient control method thereof and vehicle-mounted system

CN116696544BCN 116696544 BCN116696544 BCN 116696544BCN-116696544-B

Abstract

The invention discloses a hydrogen fuel engine system, a transient control method thereof and a vehicle-mounted system, wherein an air inlet pipeline of the hydrogen fuel engine system is connected with an air inlet manifold of an engine, an air filter, a first booster, an intercooler and a throttle valve are sequentially arranged on the air inlet pipeline along the air inlet direction, an air passage injection module of a gas injection device is arranged on the air inlet manifold, a hydrogen nozzle of the air passage injection module stretches into the air inlet manifold, an in-cylinder direct injection module of the gas injection device is arranged on the engine, a hydrogen nozzle of the in-cylinder direct injection module stretches into a cylinder combustion chamber of the engine, an ignition port is arranged in the cylinder combustion chamber and used for igniting the cylinder combustion chamber, an exhaust pipeline is connected with the air outlet manifold of the engine, and a second booster, a lambda sensor and an oxidation catalytic converter are sequentially arranged on the exhaust pipeline along the exhaust direction, so that the problem of long transient response time caused by low exhaust temperature and poor supercharging capacity of the hydrogen fuel engine can be solved.

Inventors

MA HEYANG
HUANG PINGHUI
LI CHUNYU
QIAN DINGCHAO
WANG ZHANFENG
GONG YANFENG

Assignees

中国第一汽车股份有限公司

Dates

Publication Date: 20260505
Application Date: 20230704

Claims (8)

1. A transient control method of a hydrogen-fuelled engine system, the method being applied to a hydrogen-fuelled engine system comprising: The air inlet pipeline is connected with an air inlet manifold of the engine, and an air filter, a first supercharger, an intercooler and a throttle valve are sequentially arranged on the air inlet pipeline along the air inlet direction; The fuel gas injection device comprises an air passage injection module or an in-cylinder direct injection module, wherein the air passage injection module is arranged on the air inlet manifold, and a hydrogen nozzle of the air passage injection module extends into the air inlet manifold; The spark plug is arranged at an ignition port of the cylinder combustion chamber and used for igniting the cylinder combustion chamber; the exhaust pipeline is connected with an exhaust manifold of the engine, and a second supercharger, a lambda sensor and an oxidation catalytic converter are sequentially arranged on the exhaust pipeline along the exhaust direction; the transient control method of the hydrogen fuel engine system includes: Acquiring initial torque and target torque of a vehicle-mounted system at the current moment; comparing the magnitudes of the target torque and the initial torque; when the target torque is larger than the initial torque, controlling a first supercharger to increase the concentration of hydrogen and gas in the engine, and simultaneously controlling a spark plug to ignite at a first ignition angle; Acquiring an excessive air coefficient in an exhaust pipeline in real time through a lambda sensor; when the excess air coefficient is smaller than or equal to a knock boundary value corresponding to the target torque, controlling a first booster to continuously increase the concentration of hydrogen and gas in an engine cylinder, and simultaneously controlling the spark plug to ignite at a second ignition angle so as to increase the vehicle-mounted system from the initial torque to the target torque; The first ignition angle is smaller than the steady-state ignition angle corresponding to the target torque, and the steady-state ignition angle corresponding to the target torque is smaller than the second ignition angle.
2. The transient control method according to claim 1, characterized in that a selective catalytic reduction device is further provided on the exhaust pipe after the oxidation-type catalytic converter in the exhaust direction.
3. The transient control method according to claim 1, characterized in that a NOx trap is further provided on the exhaust pipe after the oxidation catalytic converter in the exhaust direction.
4. The transient control method of claim 1, wherein said hydrogen fuelled engine system further comprises a controller; The exhaust pipe is further provided with a selective catalytic reduction device, the controller is respectively connected with the air filter, the first supercharger, the intercooler, the throttle valve, the air passage injection module, the spark plug, the second supercharger, the lambda sensor, the oxidation type catalytic converter and the selective catalytic reduction device, or the exhaust pipe is further provided with a NOx trapping device, and the controller is respectively connected with the air filter, the first supercharger, the intercooler, the throttle valve, the in-cylinder direct injection module, the spark plug, the second supercharger, the lambda sensor, the oxidation type catalytic converter and the NOx trapping device.
5. The transient control method of claim 1, wherein the hydrogen-fuelled engine system comprises a gas injection apparatus comprising an in-cylinder direct injection module, one cycle of operation of the engine comprising an intake stroke, a compression stroke, a power stroke, and an exhaust stroke, the transient control method further comprising, during an in-cylinder warm-up acceleration phase: Before the power stroke of each working cycle of the engine is finished and the exhaust stroke is started, controlling the in-cylinder direct injection module to inject hydrogen fuel into a cylinder combustion chamber, and simultaneously controlling a spark plug to ignite; wherein the in-cylinder temperature increase acceleration stage refers to a time period during which the torque of the in-vehicle system is controlled to increase to the target torque after the ignition of the spark plug at the second ignition angle.
6. The transient control method of claim 5, wherein during said in-cylinder warming acceleration phase, said engine comprises a plurality of sequentially performed duty cycles; Controlling the first supercharger to continuously increase the concentration of hydrogen gas in an engine cylinder, and simultaneously controlling the spark plug to ignite at a second ignition angle, and further comprising: And simultaneously controlling the second ignition angle of the spark plug to gradually decrease to a steady-state ignition angle corresponding to the target torque in a plurality of working cycles which are sequentially carried out.
7. The transient control method according to claim 6, characterized in that after the vehicle-mounted system increases from the initial torque to the target torque, the transient control method further comprises: and controlling the spark plug to ignite at a steady-state ignition angle corresponding to the target torque.
8. The transient control method according to claim 1, wherein after controlling the first supercharger to increase the hydrogen gas concentration in the engine cylinder while controlling the ignition of the spark plug at the second ignition angle, the transient control method further comprises: Continuously acquiring the excess air coefficient in the exhaust pipeline in real time; And controlling the supercharging proportion of the first supercharger and the second supercharger so as to enable the excess air coefficient to be stabilized at a knock boundary value corresponding to the target torque.

Description

Hydrogen fuel engine system, transient control method thereof and vehicle-mounted system Technical Field The embodiment of the invention relates to the technical field of hydrogen fuel engines, in particular to a hydrogen fuel engine system, a transient control method thereof and a vehicle-mounted system. Background At present, environmental protection and energy protection are faced, emission regulations and oil consumption regulations are becoming stricter in the industry, hydrogen is used as a clean energy without carbon, only water is generated by combustion, and zero emission of carbon and pollutants can be basically realized, so that a carbon neutralization process can be propelled by using a hydrogen fuel engine. Current hydrogen-fuelled engines basically employ lean-burn strategies, which have the advantages of high thermal efficiency and low NOx emissions. However, because the air inflow of lean combustion is more than 2 times of stoichiometric combustion, the engine cylinder has more combustion working medium, low combustion temperature and low exhaust energy, and is unfavorable for pushing the turbine to do work. Because the air inlet pressure of the engine cylinder is difficult to build, the low air inlet pressure can cause low lean combustion degree and poor dynamic property for the steady state property of the engine, and the low exhaust temperature can cause poor turbo-charging transient property for the transient property of the engine, so that the time consumed for achieving the target dynamic property is longer and the acceleration property is poor. At present, hydrogen fuel engines at home and abroad are in a research stage, industrial consensus is not achieved for industrial application routes of hydrogen fuel engines of passenger cars, and steady state and transient state control of the hydrogen fuel engines are basically in a blank state. The existing hydrogen fuel engine design generally refers to the development experience of an engine of a passenger car, achieves the steady-state dynamic performance goal through performance and structural design, and improves the transient state through adopting two-stage supercharging measures of electric and turbocharging. If the development experience of the engine of the passenger car is referred, transient response needs to be improved through two-stage supercharging, and problems of structural arrangement, control complexity and increased part cost of the electric supercharger are caused. In the electric market background, in the future, hydrogen fuel engines are mostly applied to new energy vehicles by hybrid special power, and then the solution of adopting electric two-stage supercharging causes problems of difficult cabin arrangement, high cost and the like. Therefore, the response performance of the hydrogen fuel engine is optimized, and the combustion stability, the NOx emission and the knocking performance are all in reasonable ranges, so that the method is a technical problem to be solved in the popularization of the hydrogen fuel engine at present. Disclosure of Invention The invention provides a hydrogen fuel engine system, a transient control method thereof and a vehicle-mounted system, which can solve the problem of long transient response time caused by low exhaust temperature and poor supercharging capacity of the hydrogen fuel engine In a first aspect, the present application provides a hydrogen fuelled engine system comprising: The air inlet pipeline is connected with an air inlet manifold of the engine, and an air filter, a first supercharger, an intercooler and a throttle valve are sequentially arranged on the air inlet pipeline along the air inlet direction; The fuel gas injection device comprises an air passage injection module or an in-cylinder direct injection module, wherein the air passage injection module is arranged on the air inlet manifold, and a hydrogen nozzle of the air passage injection module extends into the air inlet manifold; the spark plug is arranged at an ignition port of the cylinder combustion chamber and used for igniting the cylinder combustion chamber; and the exhaust pipeline is connected with an exhaust manifold of the engine, and a second supercharger, a lambda sensor and an oxidation catalytic converter are sequentially arranged on the exhaust pipeline along the exhaust direction. Optionally, a selective catalytic reduction device is further disposed on the exhaust pipe after the oxidation-type catalytic converter along the exhaust direction. Optionally, a NOx trapping device is further disposed on the exhaust pipe after the oxidation-type catalytic converter in the exhaust direction. Optionally, the hydrogen fuel engine system further comprises a controller; The exhaust pipe is further provided with a selective catalytic reduction device, the controller is respectively connected with the air filter, the first supercharger, the intercooler, the throttle valve, the air passage injection module, the