In the thermal type flowmeter for measuring the flow rate by a measuring element (1) with an exothermic resistor (12) and a temperature measuring resistor being shaped in the side of the surface of a substrate, a facing wall facing the surface of the measuring element (1) is arranged, cantilever plate parts (5) protruding from the facing wall toward the measuring element side are arranged, a gap is provided between the tip of the cantilever plate parts (5) and the measuring element (1), and the cantilever plate parts (5) are extended from the upper stream to the down stream of the measuring element (1).

Thermal-type flowmeter

The present invention provides a thermal flow meter capable of accurately detecting a gas to be measured, even when a resinous housing and cover are fused using a laser. This thermal flow meter (300) is equipped with an auxiliary channel for conveying a gas (30) to be measured that was taken in from a principal channel (124), and a flow detector (602) for measuring the flow of the gas (30) to be measured by performing a thermal transmission between itself and the gas (30) to be measured that is flowing through the auxiliary channel. A groove (741) is formed in a manner such that a part of the interface (792) between the rear surface of a cover (303) and the end surface of the auxiliary-channel wall (390) including a fused section (792) is positioned on the wall surface of the groove (741).

Thermal flow meter

Provided is a control device for an internal-combustion engine provided with a throttle valve installed in an intake path. A full intake air amount, which is the intake air amount corresponding to when the throttle valve is fully open, is calculated in accordance with engine revolution speed, and a theoretical intake air amount, which corresponds to when engine exhaust gas does not recirculate to a combustion chamber, is calculated in accordance with the full intake air amount and an intake pressure. An actual intake air amount of the engine is detected or estimated, and an exhaust gas recirculation rate is calculated using the theoretical intake air amount and the actual intake air amount. The engine is controlled using the calculated exhaust gas recirculation rate.

Control device for internal combustion engine

A roadside object present at the side of a road traveled by a vehicle in question, and a preceding vehicle traveling ahead of the vehicle in question at a predetermined speed or above, are detected (S14, S16) on the basis of a group of points derived by projecting, onto a two-dimensional plane, reflection points obtained by transmitting an electromagnetic wave in the direction of advance of the vehicle in question; it is determined (S18, S20) whether the roadside object has moved toward the road within a predetermined time before and after the preceding vehicle has passed close to the roadside object when the preceding vehicle moves past the roadside object; and the roadside object is determined not to be an obstacle (S22) when the roadside object is determined to have moved toward the road. A roadside object is prevented from being mistakenly determined to be an obstacle that has entered the road traveled by the vehicle in question when an object is detected using an electromagnetic wave.

Object detection device for vehicle

A thermal flow sensor includes a heater temperature controller that realizes stable startup characteristics and prevents degradation of a sensor element and can also accommodate a smaller heater. The sensor also includes a semiconductor substrate; a cavity portion provided in the semiconductor substrate; a dielectric film provided on the semiconductor substrate; a thin layer area formed as a result of the dielectric film covering the cavity portion; a heating resistor provided in the thin layer area on the dielectric film; a first temperature-sensitive resistor provided in the thin layer area on the dielectric film; a heating controller; a second temperature-sensitive resistor provided near the heating resistor; and a flow rate detector that detects a flow rate of a fluid on the basis of temperature of the second temperature-sensitive resistor. The heating controller controls the temperature of the heating resistor on the basis of first and second reference temperatures.

Thermal flow sensor

PROBLEM TO BE SOLVED: To measure a flow rate accurately even in pulsation flow by judging the presence or absence of a backward flow based on the maximum and minimum values within a constant sampling time and performing correction. SOLUTION: A pulsation amplitude A=Qmax-Qmin is obtained from the maximum value Qmax and the minimum value Qmin in a memory, and at the same time a tentative average value B=(Qmax+Qmin)/2 is obtained. Then, based on the pulsation amplitude A and the average value B, the ratio A/B is obtained, and it is judged whether a backward flow exists in a suction pipe or not based on the value of the ratio A/B. With the judgment, a specific threshold is provided at the ratio value, it is judged that a backward flow exists when the threshold is exceeded, and it is judged that no backward flow exists when the threshold is not exceeded. When it is judged that no backward flow exists, no correction is made and the value is outputted as an air flow signal. On the other hand, when it is judged that a backward flow exists, a correction value corresponding to the ratio is calculated and a value that is obtained by correcting a pulsation waveform is outputted as an air flow signal, thus accurately controlling the fuel of an engine accurately.

Heating resistor type air flow measuring device, backward flow judging method, and error-correcting method

PURPOSE: To obtain a heating type air flow rate measuring device having good measuring accuracy even to a dynamic air flow condition by providing output, memory and calculation means and also providing a correction means which corrects a reverse side air flow rate conversion function before the calculation means converts a reverse flow signal to an reverse air flow rate. CONSTITUTION: Reverse flow of an air flow in a passage is detected. Before correction of air flow rate to the reverse flow is executed, a reverse side air flow rate conversion function, i.e., a reverse flow map (flow rate map of the reverse side) for converting a signal from a heating resistor into the air flow rate is corrected. Then, the air flow rate upon the occurrence of the reverse flowing is corrected in two steps by utilizing the corrected reverse flow map. Thereby, it is possible to improve the measuring accuracy of a heating type air flow rate measuring device. Thus, the corrected reverse flow map that the map represented by static characteristics is changed beforehand to the map suitable for a dynamic air flow condition is used so that it is possible to obtain the heating type air flow rate measuring device having good measurement accuracy to the dynamic air flow condition.

Heating type measuring method and device for air flow rate

PROBLEM TO BE SOLVED: To obtain a method and an apparatus in which the pulsation of an air current can be measured without delay and precisely by a method wherein, on the basis of a flow-rate detection signal whose response delay is restored, a threshold value is detected and the direction of the flow of the air is estimated on the basis of the crossing of the threshold value with the flow-rate detection signal whose response delay is restored. SOLUTION: A microcomputer 40 compensates the response delay of a flow-rate detection signal which is obtained from a heat-ray probe 11 and which contains a response delay. It sets a threshold value on the basis of the maximum value and the minimum value of the detection signal whose response delay is compensated, and it judges a reverse-flow section. According to the judged reverse-flow section, the detection signal is compensated, and an air flow rate is measured precisely. That is to say, in order to reduce a measuring error at the pulsation of the air flow rate, the response delay of the flow-rate detection signal obtained from the heat-ray probe 11 is restored. A threshold value is computed on the basis of the detection signal whose response delay is restored. The direction of the flow of the air is estimated on the basis of the crossing of the threshold value with the detection signal whose response delay id restored. Thereby, a following-flow section is discriminated from the reverse-flow section without delay. A correction processing operation can be performed, and the measuring accuracy of an average air flow rate can be increased when a reverse flow is generated.

Method and apparatus for measurement of air flow rate

PURPOSE: To realize an optical radar device for vehicles with high resolution with a simple optical system. CONSTITUTION: This device has a light transmission part 100 emitting pulse- modulated light signal in beam in the air, a light reception part 106 for receiving the reflection light from a reflective object and a distance measuring part 107 measuring the existence of a reflective object and the distance and the like from the outputs of the light transmission part 100 and the light reception part 106. The laser beam emitted from the luminous element 104 of the light transmission part 100 is reflected with a polygon mirror 101 and scanned, and the luminous element 104 is made em,t at a timing gradually delayed from the synchronized signal 200 of motor 102 rotation using an emission timing controller, which is scanned with smaller angle divisions than the spread angle of the emitted laser beam. COPYRIGHT: (C)1996,JPO

Optical radar device

PURPOSE:To obtain a radar in which a plurality of objects can be captured at high speed and the distances thereof can be measured. CONSTITUTION:The radar comprises a synchronous processing section 400 for mixing a receiving signal demodulated at a receiving section 300 and a PN code generated and delayed at a PN code generator 100, a correlation processing section 500 for delivering signals corresponding to the distances up to a plurality of objects reflected the radar radio wave based on a correlation output derived from the mixed output, and an execution processing section 700 for calculating the distances up to respective objects. The synchronizing section 400 mixes the receiving signal with the PN code delayed through variable delay circuits 401,...,404 using multipliers 451,...,453. The correlation processing section 500 receives the mixed output and determines a correlated output through correlation processing circuits 501,...,503 thus capturing a plurality of objects simultaneously.

菅家厚

Papers

Heating resistor type air flow measuring device, backward flow judging method, and error-correcting method

Heating type measuring method and device for air flow rate

Method and apparatus for measurement of air flow rate

Optical radar device

Radar employing spread spectrum technology

菅家 厚

Papers

Heating resistor type air flow measuring device, backward flow judging method, and error-correcting method

Heating type measuring method and device for air flow rate

Method and apparatus for measurement of air flow rate

Optical radar device

Radar employing spread spectrum technology

菅家厚