An intake device includes an air filter that filters intake air for an internal combustion engine, a filter casing housing the air filter, and an air physical quantity sensor. The filter casing includes an intake passage to allow the intake air to pass from upstream to downstream of the air filter. The filter casing has a passage wall portion that is electrically conductive and exposed to the intake passage on a downstream side of the air filter. The air physical quantity sensor has: a sensor element that detects a specific physical quantity related to the intake air on a downstream side of the air filter; and a grounding structure electrically connected to the passage wall portion for grounding the sensor element.

Embodiments of the present disclosure may suppress conduction between an anode and a cathode caused by condensed water in an oil removal apparatus in which oil particles are collected in a filter disposed between the anode and the cathode. An insulating layer may be sandwiched either between the filter and at least one of the anode and the cathode of the bipolar electrode, or within the filter so as to extend in a flow direction of blow-by gas, and may have an insulating property so as to prevent condensed water generated when moisture in the blow-by gas condenses, from connecting the anode and the cathode of the bipolar electrode.

An engine air intake dust removal system and method, comprising an air intake dust removal system inlet (1011), an air intake dust removal system outlet and an air intake electric field device (1014). The air intake dust removal system (101) and method can effectively remove particulate matters from air trying to enter the engine, and make the air entering the engine cleaner.

A method for reducing dust removal electric field couplings includes the following steps: selecting a ratio between a dust collection area of a dust removal electric field anode and a discharge area of a dust removal electric field cathode to be 1.667:1-1680:1. A dust removal electric field anode and/or dust removal electric field cathode size is selected so that the number of electric field couplings is less than or equal to 3. The number of electric field couplings is reduced, electric field energy consumption is low, electric field coupling consumption for an aerosol, water mist, oil mist and loose smooth particulate matter is reduced, and electric field energy is saved.

An air dust removal method, comprising the following steps: 1) using an ionization dust removal electric field to adsorb particulate matters in intake air; and 2) using the ionization dust removal electric field to charge an intake air electret element. The method can effectively remove dust in air, the dust removal ability is better, and the dust removal efficiency is higher.

An air dust removal system (101) includes a dust removal system inlet (1011), a dust removal system outlet, and an electric field apparatus (1014). The electric field apparatus (1014) has an electric field apparatus inlet, an electric field apparatus outlet, a dust removal electric field cathode (10142), and a dust removal electric field anode (10141); the dust removal electric field cathode (10142) and the dust removal electric field anode (10141) are used for generating an ionization dust removal electric field. When dust is collected in the ionization dust removal electric field, the electric field apparatus (1014) detects an electric field current. The air dust removal system (101) can effectively remove particulate matters in air.

A system for removing dust from the air includes a dust-removing system inlet, a dust-removing system outlet and an electric field apparatus. The electric field apparatus has an electric field apparatus inlet, an electric field apparatus outlet, a dust-removing electric field cathode and a dust-removing electric field anode. The dust-removing electric field cathode and the dust-removing electric field anode are used to generate an ionizing electric field for dust removal. The system for removing dust from the air can effectively remove particulates in the air.

An air dust removal system (101) includes a dust removal system inlet, a dust removal system outlet, and an electric field device (1014). The electric field device (1014) has an electric field device inlet (1011), an electric field device outlet, a dust removal electric field cathode (10142), and a dust removal electric field anode (10141). The dust removal electric field cathode (10142) and the dust removal electric field anode (10141) generates an ionizing dust removal electric field. The dust removal electric field anode (10141) has a first anode portion (101412) and a second anode portion (101411). The first anode portion (101412) is close to the inlet of the electric field device (1014), and the second anode portion (101411) is close to the outlet of the electric field device (1014). At least one insulating mechanism (1015) is provided between the first anode portion (101412) and the second anode portion (101411).

A system for removing dust from air (101) includes a dust removal system inlet (1011), a dust removal system outlet, and an electric field apparatus (1014). The electric field apparatus (1014) has an electric field apparatus inlet (3085), an electric field apparatus outlet (3088), a dust removal electric field cathode (3081) and a dust removal electric field anode (3082). The dust removal electric field cathode (3081) and the dust removal electric field anode (3082) are used to generate an ionization dust removal electric field. By means of the present system for removing dust from air (101), particulate matter can be effectively removed from air.

An air dust removal system (101) and method, comprising a dust removal system inlet, a dust removal system outlet, and an electric field device. The electric field device comprises an electric field device inlet (1011), an electric field device outlet (1012), a dust removal electric field cathode (10142), and a dust removal electric field anode (10141). The dust removal electric field cathode (10142) and the dust removal electric field anode (10141) are used to generate an ionizing dust removal electric field. The present air dust removal system (101) and method may effectively remove particulate matter from the air.