Measuring and testing – Fluid pressure gauge – Combined
Patent
1998-07-02
2000-11-07
McCall, Eric S.
Measuring and testing
Fluid pressure gauge
Combined
731173, 73756, G01M 1500
Patent
active
061420204
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates, in general, to pressure and temperature sensors for internal combustion engines and, more particularly, to a pressure and temperature sensor assembly commonly used as a conventional MAP sensor installed in a surge tank of an engine and used for sensing the internal pressure of a cylinder prior to auxiliarily controlling suction timing of mixed gas into the cylinder and as a temperature sensor used for sensing the temperature of filtered inlet air of the cylinder prior to allowing an ECU for the engine to calculate an appropriate amount of air for the engine in accordance with a density variation of air caused by variable temperature.
BACKGROUND ART
As well known to those skilled in the art, an internal combustion engine for automobiles is typically and separately provided with two types of sensors, that is, a MAP (manifold absolute pressure) sensor and a temperature sensor. The MAP sensor is used for auxiliarily controlling suction timing of mixed gas into a cylinder by sensing the internal pressure of a surge tank and outputting a pressure signal to an ECU (electronic control unit) for the engine. Meanwhile, the temperature sensor is used for sensing the temperature of inlet air, which is sucked into the cylinder through an air cleaner, prior to outputting a temperature signal to the ECU. The temperature sensor thus allows the ECU to effectively calculate an appropriate amount of air for the engine in accordance with a density variation of air caused by the variable temperature. The MAP sensor is installed in a surge tank of an engine, while the temperature sensor is installed in an intake tube. However, the two sensors are designed to perform different functions and are separately mounted to their positions in an engine, thus having the following problems.
1. The conventional MAP and temperature sensors are separately positioned in an engine, thus complicating the construction of the engine and consuming labor and time and reducing work efficiency while being installed in the engine.
2. The temperature sensor, which is installed in the intake tube of the engine, is regrettably exposed to impurities such as moisture, dust and powdered rock in the inlet air and so such impurities easily damage the temperature sensor and reduce the sensitivity of the sensor, thereby reducing the operational precision of the temperature sensor.
3. The separately mounted MAP and temperature sensors increase the numbers of parts of the sensors, thus lengthening the processing time, reducing productivity and increasing the production cost.
DISCLOSURE OF THE INVENTION
Accordingly, the present invention has been made keeping in mind the above problems occurring in the prior art, and an object of the present invention is to provide a pressure and temperature sensor assembly for internal combustion engines, which is commonly used as a conventional MAP sensor and a conventional temperature sensor for such engines, thus reducing the number of sensing parts in such an engine, simplifying the sensor manufacturing process, improving productivity, reducing the production cost, simplifying the construction of the sensor, reducing the damaged area of the temperature sensor caused by impurities of inlet air, and effectively accomplishing the operational precision of the sensors.
In order to accomplish the above object, the present invention provides a pressure and temperature sensor assembly for internal combustion engines, comprising a pressure sensor member having a pressure inlet pipe on its bottom center, a circuit board electrically connected to the sensor member, a housing receiving both the sensor member and the circuit board therein and being formed by integrating top and bottom cases into a single structure, the top case being integrated with a connector having a plurality of connection pins, and the bottom case being provided with a pressure inlet port being concentric with the pressure inlet pipe of the sensor member, wherein the bottom case is partially protruded downward at
REFERENCES:
patent: 4630028 (1986-12-01), Kelly et al.
patent: 5756899 (1998-05-01), Ugai et al.
patent: 5834638 (1998-11-01), Taylor et al.
Kim Joo-Young
Lee Sang-Jo
Park Hyun-Ju
Park Tae-Wook
Yu Dae-Hyun
Kefico Corporation
McCall Eric S.
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