6 results about "Automotive emissions" patented technology

This invention provides a fuel injection method for an engine, an engine, a vehicle, and a computer-readable storage medium, relating to the field of vehicle exhaust emission control technology. The fuel injection method provided by this invention includes the following steps: Before the engine reaches a stable idle speed, fuel is injected at a preset fuel pressure during the first intake stroke and the first compression stroke of each working cycle, wherein the fuel injection mass ratio of the first intake stroke to the first compression stroke is greater than 4:1, and the preset fuel pressure ranges from 20 to 50 MPa. When the engine speed is at a stable idle speed, fuel is injected during the second intake stroke and the second compression stroke of each working cycle at a preset fuel pressure, wherein the fuel injection mass ratio of the second intake stroke to the second compression stroke is greater than or equal to 4:1. This method ensures that the vehicle's exhaust emission level meets the requirements of Euro 6 emission standards without requiring a particulate filter, thus optimizing the engine's original emissions.

An automobile emission detection device disclosed by the present invention comprises a circular plate, a cylindrical sleeve penetrates through the circular plate and is rotatably connected with the circular plate through a fixed shaft, the inner wall of one end of the cylindrical sleeve is rotatably connected with a connecting pipe connected with an automobile exhaust pipe, and rectangular through grooves are symmetrically formed in the two ends of the connecting pipe. The inner walls of the rectangular through grooves are movably connected with first L-shaped rods conducting horizontal reciprocating motion, the ends, away from the connecting pipe, of the first L-shaped rods are fixedly connected with the circular plate, and the ends, away from the circular plate, of the first L-shaped rods are fixedly connected with arc-shaped plates matched with the inner wall of the connecting pipe. Connecting rods are fixedly connected to the opposite faces of the two arc-shaped plates, first cylindrical rods are fixedly connected to the opposite faces of the connecting rods, and a gas detector for detecting automobile exhaust is fixedly connected to one connecting rod. The automobile exhaust filtering device has the advantages that the automobile exhaust is filtered, and the air quality is further improved.

The invention relates to a calibration device of an automobile emission analysis system, and belongs to the technical field of automobile exhaust emission detection.The calibration device comprises a flexible air bag, a multi-channel gas divider, a gas circuit control module and a controller, a gas outlet of the multi-channel gas divider is connected with a gas inlet of the flexible air bag, and a gas outlet of the multi-channel gas divider is connected with a gas outlet of the flexible air bag; an air outlet of the flexible air bag is connected with the air path control module through a pipeline, and the flexible air bag is also connected with a sampling port of the discharge analyzer to be calibrated through a pipeline; zero gas and distance gas are mixed through a multi-channel gas divider to generate calibration gas with known concentration, the calibration gas is stored in a flexible gas bag, the pressure of the gas bag is adjusted through a gas path control module to simulate an actual sampling environment, and accurate calibration of the emission analyzer to be calibrated is completed in combination with temperature compensation and a nonlinear correction algorithm. According to the invention, efficient and accurate calibration of the automobile emission analysis system is realized, the calibration efficiency and accuracy are improved, the measurement error is effectively reduced, and emission test requirements under various working conditions are met.

The application relates to the technical field of computational fluid dynamics and structural acoustic simulation, and particularly discloses a fluid-structure-acoustic coupling simulation method and device for an automobile exhaust emission system and a storage medium, which comprises the following steps: constructing a pipeline three-dimensional geometric model of the automobile exhaust emission system; performing finite element grid division on the pipeline three-dimensional geometric model; performing fluid dynamics simulation calculation on the pipeline finite element grid model; extracting flow field load of pipeline fluid characteristics; transferring pipeline flow field load data to a structure grid for fluid-structure coupling analysis according to heterogeneous grid data mapping; performing structural and acoustic coupling simulation analysis according to structural vibration response results; and realizing quantitative evaluation of the aerodynamic noise and structural vibration of the automobile exhaust emission system according to the structural vibration response results and the sound pressure distribution results of the internal sound field of the pipeline. The fluid-structure-acoustic coupling simulation method for the automobile exhaust emission system can realize collaborative analysis of the aerodynamic noise and structural vibration of the automobile exhaust emission system.

The utility model belongs to tail gas emission test field discloses a kind of tail gas secondary combustion test devices, mainly for automobile tail gas emission test, with State environmental protection requirement of automobile is adjusted high, in order to meet the requirement of automobile tail gas emission to meet national emission standard, the utility model mainly through the experiment test equipment of simulating different flow tail gas and tail gas under different temperature influence on nitrogen oxides (NOx) after participating in engine secondary combustion.By simulating engine in different operating conditions inject different flow tail gas and different temperature tail gas participate in combustion after through instrument test emission tail gas nitrogen oxides (NOx) concentration, obtain the data of tail gas injection and engine operating condition, to obtain reference data for the design and optimization of engine tail gas secondary introduction engine combustion.

The utility model discloses an automobile tail gas detection device, which belongs to the technical field of automobile detection, and adopts the technical scheme that the automobile tail gas detection device comprises a tail gas analyzer. The probe is connected with the tail gas analyzer, the gas collecting hood is arranged on the periphery of the probe, the exhaust fan is communicated with the gas collecting hood through a gas pipe, and the tail gas treatment structure is arranged on the gas pipe; a positioning ring for mounting the probe is arranged on the inner wall of the small end of the gas-collecting hood, a lead outlet of the probe is formed in the gas-collecting hood, and a sealing ring is arranged at the joint of the gas-collecting hood and the lead outlet; a lifting support is arranged on the lower portion of the gas collecting hood, and the automobile exhaust pipe is located between the probe and the gas collecting hood. The device has the beneficial effects that the probe collects tail gas for analysis, and the gas collecting hood collects peripheral waste gas and purifies the waste gas through the tail gas treatment structure, so that indoor pollution is reduced; the height-adjustable lifting support can adapt to the positions of tail pipes of different vehicle types.