摘要:
The invention relates to a thermal type flow meter comprising a support member (4) formed by a material of which the coefficient Δλ of temperature of the thermal conductivity is small. The absolute value of the output error can be decreased to a value smaller than the prior art by a bridge circuit provided with a temperature compensating element (5) and several constant resistors.
摘要:
The invention relates to a thermal type air flow measuring apparatus comprising a body (6) which provides with a main passage (5) and a module which is integrated combination of an auxiliary passage (3) having a bent portion (303) and an electronic circuit (8) electrically connected to a heating resistor (1) disposed in said auxiliary passage (3), wherein said module is attached on said body (6) which has an insertion hole (14) through which said auxiliary passage (3) of said module is inserted into said main passage, said electric circuit (8) is disposed outside of said main passage (5), and wherein said body (6) has a mounting surface (15) for mounting said module thereon, said mounting surface (15) projects from an outer surface of said body, and an inlet (301) of said auxiliary passage (3) is placed in the main passage such that a position the inlet (301) is in an area shifted from a center of a cross section of the main passage and around the center of the main passage.
摘要:
The invention relates to a thermal type air flow measuring apparatus comprising a body (6) which provides with a main passage (5) and a module which is integrated combination of an auxiliary passage (3) having a bent portion (303) and an electronic circuit (8) electrically connected to a heating resistor (1) disposed in said auxiliary passage (3), wherein said module is attached on said body (6) which has an insertion hole (14) through which said auxiliary passage (3) of said module is inserted into said main passage, said electric circuit (8) is disposed outside of said main passage (5), and wherein said body (6) has a mounting surface (15) for mounting said module thereon, said mounting surface (15) projects from an outer surface of said body, and an inlet (301) of said auxiliary passage (3) is placed in the main passage such that a position the inlet (301) is in an area shifted from a center of a cross section of the main passage and around the center of the main passage.
摘要:
A thermal type air flow measuring instrument is mounted to a main passage (5) forming an intake air passage of an internal combustion engine and is provided with an auxiliary passage (3) which includes a heating resistor (1) and a temperature sensing resistor (2) therein and an electronic circuit (8) which is electrically connected to the heating resistor and the temperature sensing resistor. The auxiliary passage is a passage including at least one bent portion (303) composed of a first path (302) substantially parallel to the main passage and a second path (302) having a path different in flow direction from the first path. A member (4) forming the auxiliary passage is fixed in a united form to only a case member for interiorly protecting the electronic circuit, and the case member is fixed to the outer wall surface of the intake air passage. The auxiliary passage structure capable of being handled as a single module united to the case member is effective to the mass production of an air flow control system and the reduction in cost thereof since the structure can be mounted to different kinds of internal combustion engines.
摘要:
The invention relates to a hot-wire type air flow meter comprising a block (230) in which an auxiliary flow path (242) is formed and a circuit unit (2) is coupled to the block (230), wherein the block (230) is inserted removably through a wall of a body (240) forming a primary flow path (241) and constituting an intake air passage of an internal combustion engine, wherein the whole auxiliary flow path (242) can be mounted to and released from the body (240) with the block (230) and wherein the auxiliary flow path (242) having an inlet portion opening to the upstream side of the primary flow path (241) and having a curved and folded auxiliary flow path (242) in order to obtain a length of the auxiliary flow path (242) being larger than the axial length of the block (230).