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MOSEB sensor is a sensor that measures the air flow drawn into the engine. In electronically controlled gasoline injection engines, to obtain the optimal mixture concentration under various operating conditions, it is necessary to accurately measure the amount of air drawn into the engine at every instant, using this as the main basis for the ECU to calculate (control) the fuel injection quantity. If the air flow sensor or wiring fails, the ECU will not receive the correct intake air signal, preventing normal control of fuel injection quantity, which will cause the mixture to be too rich or too lean, resulting in abnormal engine operation.

MOSEB sensor structure

Consists of two parts: the scale grating and the grating readhead. The figure on the right shows the structure of the grating scale. The key part of the grating detection device is the grating readhead, which consists of a light source, condensing lens, index grating, photoelectric elements, and adjustment mechanisms. There are many structural forms of grating readheads, classified according to structural characteristics and application scenarios into direct-reception readheads (also known as silicon photovoltaic cell readheads, mirror-image readheads, beam-splitter readheads, and metal grating reflective readheads).

MOSEB sensor principle

The essence of a grating displacement sensor is to measure position using the grating pitch as a standard ruler. High-resolution grating scales are generally expensive and difficult to manufacture. To improve system resolution, Moiré fringes need to be subdivided; grating scale sensor systems mostly use electronic subdivision methods. When two gratings overlap with a slight angle, Moiré fringes are generated in a direction roughly perpendicular to the grating lines. As the grating moves, the Moiré fringes move up and down accordingly. This converts the measurement of grating pitch into the measurement of the number of Moiré fringes. Within one Moiré fringe width, placing 4 photoelectric devices at certain intervals enables electronic subdivision and direction determination functions. For example, for a grating scale with 50 line pairs/mm, the grating pitch is 0.02mm. With four-fold subdivision, counting pulses with a resolution of 5μm can be obtained, which achieves high precision in general industrial measurement and control. Since displacement is a vector, both its magnitude and direction must be detected; therefore, at least two photoelectric signals with different phases are required. To eliminate common-mode interference, DC components, and even harmonics, differential amplifiers composed of low-drift operational amplifiers are typically used. The 4 photoelectric signals obtained from 4 photosensitive devices are sent to the input terminals of 2 differential amplifiers respectively. The two signals output from the differential amplifiers have a phase difference of π/2. To obtain direction determination and counting pulses, these two signals need to be shaped, first into square waves with a duty cycle of 1:1. Then, by comparing the phases of the square waves, the movement direction of the grating scale can be determined. By counting the square wave pulses, the displacement and speed of the grating scale can be obtained.

MOSEB sensor usage precautions

When plugging and unplugging the connector of the linear encoder sensor and the digital readout unit, ensure the power is turned off. Install an external protective cover whenever possible, and promptly remove chips and oil splashed onto the scale to strictly prevent any foreign matter from entering the housing of the linear encoder sensor. Regularly check whether the mounting and connection screws are loose. To extend the service life of the dust-proof sealing strip, apply a thin, even layer of silicone oil to the sealing strip, taking care not to splash it onto the glass grating etched surface. To ensure reliable operation of the linear encoder sensor, periodically clean and wipe the linear encoder scale surface and the index grating surface with an ethanol mixture (50%), keeping the glass linear encoder scale surface clean. The linear encoder sensor is strictly prohibited from being subjected to severe vibration or impact, as this may damage the linear encoder scale; if the linear encoder scale breaks, the linear encoder sensor will fail. Do not disassemble the linear encoder sensor yourself, and never arbitrarily change the relative spacing between the main grating scale and the secondary grating scale. Otherwise, this may compromise the accuracy of the linear encoder sensor and cause relative friction between the main grating scale and the secondary grating scale, damaging the chrome layer and thus the grating lines, resulting in scrapping of the linear encoder scale. Take care to prevent oil stains and water from contaminating the linear encoder scale surface, as this may disrupt the distribution of the grating lines and cause measurement errors. Avoid operating the linear encoder sensor in environments with severe corrosive effects, to prevent corrosion of the grating chrome layer and the linear encoder scale surface, which would degrade the quality of the linear encoder scale.

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