Abstract: An ultra-compact post-processing system, a supercharger assembly and an engine are provided. The ultra-compact post-processing system includes a mixer provided with an inlet joint to be connected to the supercharger body, a urea nozzle connected to the inlet joint, a shell provided outside a part of the mixer and provided with a gas outlet, and a catalytic disc provided in the shell between an outer periphery of the mixer and an inner wall of the shell and dividing an inner cavity of the shell into a mixing cavity and a gas-return cavity. The gas outlet of the shell is located at the gas-return cavity, and an outlet end of the mixer is provided with a mixing section that is located in the mixing cavity.

Abstract: A urea pump, and a control method and control system for the urea pump are described. The urea pump comprises: a liquid intake pipeline; an instant heating type filtering device, an inlet of the instant heating type filtering device being in communication with a urea tank via the liquid intake pipeline, and the instant heating type filtering device being configured to filter and heat a urea solution flowing in through the inlet pipeline; a pressure build-up pump arranged at the inlet pipeline and configured to drive the urea solution flowing to the instant heating filtering device through the liquid intake pipeline; a liquid output line in communication with a first outlet of the instant heating filtering device and configured to deliver a filtered and heated urea solution to a nozzle; and a liquid return pipeline.

Abstract: A urea pump, and a control method and control system for the urea pump are disclosed. The urea pump comprises: a liquid intake pipeline; an instant heating type filtering device, an inlet of the instant heating type filtering device being in communication with a urea tank via the liquid intake pipeline, and the instant heating type filtering device being configured to filter and heat a urea solution flowing in through the inlet pipeline; a pressure build-up pump arranged at the inlet pipeline and configured to drive the urea solution flowing to the instant heating filtering device through the liquid intake pipeline; a liquid output line in communication with a first outlet of the instant heating filtering device and configured to deliver a filtered and heated urea solution to a nozzle; and a liquid return pipeline.

Abstract: A special-shaped plane reflecting mirror including a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a fourth reflecting mirror and a fifth reflecting mirror; wherein the second reflecting mirror and the fourth reflecting mirror are constructed the same and symmetrically arranged on both sides of the first reflecting mirror, the third and fifth reflecting mirrors have the same structure and are arranged symmetrically on both sides of the first reflecting mirror, the first reflecting mirror is placed at an angle of 45° with the horizontal plane, and the second reflecting mirror. The first mirror is placed at an angle of 45° with the horizontal plane, the angle between the reflection surface of the second mirror and the reflection surface of the first mirror is 165°, and the angle between the reflection surface of the third mirror and the reflection surface of the first mirror is 163°.

Abstract: A rail vehicle and a guide device and a guide wheel mounting base used for the rail vehicle are provided. The guide wheel mounting base includes a mounting bracket and a wheel shaft fixing shaft. A through guide hole is provided on the mounting bracket. An outer end of the wheel shaft fixing shaft is connected with a guide wheel. An inner end of the wheel shaft fixing shaft extends through the guide hole. The wheel shaft fixing shaft is movable along an extending direction of the guide hole.

Abstract: A special-shaped plane reflecting mirror including a first reflecting mirror, a second reflecting mirror, a third reflecting mirror, a fourth reflecting mirror and a fifth reflecting mirror; wherein the second reflecting mirror and the fourth reflecting mirror are constructed the same and symmetrically arranged on both sides of the first reflecting mirror, the third and fifth reflecting mirrors have the same structure and are arranged symmetrically on both sides of the first reflecting mirror, the first reflecting mirror is placed at an angle of 45° with the horizontal plane, and the second reflecting mirror. The first mirror is placed at an angle of 45° with the horizontal plane, the angle between the reflection surface of the second mirror and the reflection surface of the first mirror is 165°, and the angle between the reflection surface of the third mirror and the reflection surface of the first mirror is 163°.

Abstract: A method for detecting lens cleanliness of a lens in a flat-field optical path, the flat-field optical path includes a light source, the lens, a camera, the light source is a narrow-band multispectral uniform surface light source, the camera's light-sensitive surface is disposed perpendicular to an optical axis of the lens and in the light position of the lens and a pupil interposed between the lens and the light source, the method including collecting the bright-field image data and dark-field image data for a plurality of pupil aperture sizes through the lens; for each pixel, performing a pupil differential flat field correction to yield a plurality of PiPj pupil differentials; and displaying the pupil differentials in the form of a plurality of images to show uniformity of each the image, wherein a non-uniform area on each the image is determined to have been caused by an impurity of the lens.

Abstract: A method for detecting lens cleanliness of a lens in a flat-field optical path, the flat-field optical path includes a light source, the lens, a camera, the light source is a narrow-band multispectral uniform surface light source, the camera's light-sensitive surface is disposed perpendicular to an optical axis of the lens and in the light position of the lens and a pupil interposed between the lens and the light source, the method including collecting the bright-field image data and dark-field image data for a plurality of pupil aperture sizes through the lens; for each pixel, performing a pupil differential flat field correction to yield a plurality of PiPj pupil differentials; and displaying the pupil differentials in the form of a plurality of images to show uniformity of each image, wherein a non-uniform area on each image is determined to have been caused by an impurity of the lens.