JP2007162480A - Atmospheric pressure detection device for engine - Google Patents

Atmospheric pressure detection device for engine Download PDF

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JP2007162480A
JP2007162480A JP2005356015A JP2005356015A JP2007162480A JP 2007162480 A JP2007162480 A JP 2007162480A JP 2005356015 A JP2005356015 A JP 2005356015A JP 2005356015 A JP2005356015 A JP 2005356015A JP 2007162480 A JP2007162480 A JP 2007162480A
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intake pipe
value
atmospheric pressure
pressure
pipe pressure
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Hiroto Ota
博途 太田
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Nikki Co Ltd
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Nikki Co Ltd
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Priority to KR1020060094905A priority patent/KR20070061314A/en
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D45/00—Electrical control not provided for in groups F02D41/00 - F02D43/00
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
    • G01L23/00—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid
    • G01L23/24—Devices or apparatus for measuring or indicating or recording rapid changes, such as oscillations, in the pressure of steam, gas, or liquid; Indicators for determining work or energy of steam, internal-combustion, or other fluid-pressure engines from the condition of the working fluid specially adapted for measuring pressure in inlet or exhaust ducts of internal-combustion engines
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/40—Engine management systems

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)

Abstract

<P>PROBLEM TO BE SOLVED: To perform appropriate atmospheric pressure correction by enabling to continuously detect accurate atmospheric pressure without increase of cost in an engine control system provided with an intake pipe pressure sensor. <P>SOLUTION: In an atmospheric pressure detection device used for an engine control system in which an electronic control device 10 performs operation control based on intake pipe pressure valve measured by the intake pipe pressure sensor 11, intake pipe pressure is continuously measured by the intake pipe pressure sensor 11, an average value of intake pipe pressure of a predetermined period of time is calculated and is used as atmospheric pressure value when the intake pipe pressure value during the predetermined period of time is in a range between a predetermined lower limit pressure value and an upper limit pressure value, and intake pipe pressure change quantity during the period is a predetermined pressure change quantity limit value or less. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

本発明は、エンジン制御のために大気圧を検出する装置に関し、殊に、吸気管圧力センサを備えたエンジン制御システムにおいて、測定した吸気管圧力値を用いて大気圧を検出するエンジンの大気圧検出装置に関する。   The present invention relates to an apparatus for detecting atmospheric pressure for engine control, and more particularly to an engine atmospheric pressure for detecting atmospheric pressure using a measured intake pipe pressure value in an engine control system having an intake pipe pressure sensor. The present invention relates to a detection device.

エンジンの制御システムにおいては、大気圧が変動すると吸入空気量も変動することから、最適な空燃費を維持するために空気密度の変動量に応じて燃料噴射量を補正する制御が必要となる。この場合、大気圧センサを用いて大気圧を検出することが一般的である。   In the engine control system, when the atmospheric pressure changes, the amount of intake air also changes, so that control for correcting the fuel injection amount in accordance with the amount of change in air density is necessary in order to maintain optimum air-fuel consumption. In this case, it is common to detect atmospheric pressure using an atmospheric pressure sensor.

しかし、芝刈り機や発電機等に搭載される汎用エンジンにおいては、大気圧センサが比較的高価格ということもありこれを省略した制御システムを採用していることが多い。そのため、このような制御システムにおいては、大気圧の変動に対応したエンジンの自動制御を行えないことから、変動しやすい大気圧の外的要素により、排ガス特性や出力などに代表されるエンジン性能を充分に発揮できない場合が生じてしまう。   However, general-purpose engines mounted on lawn mowers, generators, and the like often employ a control system that omits the atmospheric pressure sensor because it is relatively expensive. For this reason, in such a control system, the engine cannot be controlled automatically in response to fluctuations in atmospheric pressure. Therefore, engine performance typified by exhaust gas characteristics and output can be achieved by external factors that tend to fluctuate. The case where it cannot fully demonstrate will arise.

そこで、特開平５−１６１５号公報に記載されているように、エンジンを制御する電子制御ユニットがエンジン回転速度および吸気管圧力のデータを基にして吸入空気量を算出するスピード・デンティシティ方式を採用している場合に、吸気管圧力センサを利用してスタータキイをＯＮとしてから所定時間内の吸気管圧力を近似大気圧とし、これを基に燃料噴射量の補正を行う技術が知られている。しかし、この技術ではエンジン運転中に大気圧の変動があった場合に対応できないため、エンジンの運転性を損なってしまう場合がある。   Therefore, as described in Japanese Patent Application Laid-Open No. 5-1615, a speed-dentity system in which an electronic control unit that controls an engine calculates an intake air amount based on engine rotational speed and intake pipe pressure data. Is known, a technology for correcting the fuel injection amount based on the intake pipe pressure within a predetermined time after the start key is turned on using the intake pipe pressure sensor is set to the approximate atmospheric pressure. ing. However, since this technique cannot cope with a change in atmospheric pressure during engine operation, the operability of the engine may be impaired.

この問題に対し、特開平６−２８０６６６号公報や特開２００３−１７６７４９号公報には、エンジン始動後において吸気管圧力センサで検知した吸気管圧力の変動量が所定期間に亘って所定の許容値内である場合に、電子制御ユニットにその平均値を大気圧として記憶する技術が提案されている。これらは、エンジン運転中においても吸気管圧力を継続的に検出し、圧力変動幅が少ない部分を取り出してその平均値を算出することで大気圧として記憶するものである。   In response to this problem, Japanese Patent Laid-Open Nos. 6-280666 and 2003-176749 disclose that an intake pipe pressure fluctuation amount detected by an intake pipe pressure sensor after engine startup is a predetermined allowable value over a predetermined period. If it is within the range, a technique for storing the average value as an atmospheric pressure in the electronic control unit has been proposed. In these, the intake pipe pressure is continuously detected even during engine operation, a portion having a small pressure fluctuation range is taken out, and an average value thereof is calculated and stored as an atmospheric pressure.

しかしながら、これらの技術では、何らかの原因で吸気管圧力値が大気圧において想定される変動域外において所定期間に亘って許容値内の変動量となった場合は、そのときの吸気管圧力の平均値を大気圧として認識してしまい、実際とはかけ離れた大気圧補正を行ってエンジンの運転性が急に悪化させてしまう心配がある。
特開平５−１６１５号公報 特開平６−２８０６６６号公報 特開２００３−１７６７４９号公報 However, in these technologies, if the intake pipe pressure value becomes a fluctuation amount within the allowable value for a predetermined period outside the fluctuation range assumed at atmospheric pressure for some reason, the average value of the intake pipe pressure at that time May be recognized as the atmospheric pressure, and there is a concern that the drivability of the engine may be suddenly deteriorated by correcting the atmospheric pressure far from the actual pressure.
JP-A-5-1615 JP-A-6-280666 JP 2003-176749 A

本発明は、上記のような問題点を解決しようとするものであり、吸気管圧力センサを備えたエンジン制御システムにおいて、コストの高騰を伴うことなく正確な大気圧を連続的に検出可能として、適正な大気圧補正を行えるようにすることを課題とする。   The present invention is intended to solve the above-described problems, and in an engine control system equipped with an intake pipe pressure sensor, it is possible to continuously detect an accurate atmospheric pressure without increasing costs. It is an object to enable proper atmospheric pressure correction.

そこで、本発明は、吸気管圧力センサで測定した吸気管圧力値に基いて、電子制御装置が運転制御を行うエンジンの制御システムに用いられる大気圧検出装置において、吸気管圧力センサで連続的に吸気管圧力を測定し、所定時間中の吸気管圧力値が予め定めた下限圧力値と上限圧力値の範囲内で、且つその時間中の吸気管圧力変化量が予め定めた圧力変化量リミット値以下に収まる場合に、その時間中の吸気管圧力の平均値を算出して、大気圧値として用いるものとした。   Therefore, the present invention provides an atmospheric pressure detection device used in an engine control system in which an electronic control unit performs operation control based on an intake pipe pressure value measured by an intake pipe pressure sensor. Measure the intake pipe pressure, the intake pipe pressure value during the predetermined time is within the range of the predetermined lower limit pressure value and upper limit pressure value, and the intake pipe pressure change amount during that time is the predetermined pressure change amount limit value When the value falls within the following range, the average value of the intake pipe pressure during that time is calculated and used as the atmospheric pressure value.

これにより、測定した吸気管圧力値を用いて、所定時間中の吸気管圧力変化量が所定の圧力変化量リミット値以下に収まる部分、即ちエンジン駆動に起因する圧力変動の影響の少ない部分を検出しコストを高騰させることなく大気圧値として利用できることに加えて、それが一般的に想定される大気圧の範囲内であることを検証するようにしたことでイレギュラーな値を大気圧として認識してしまうリスクを容易に回避できる。   As a result, using the measured intake pipe pressure value, a part where the amount of change in the intake pipe pressure during the predetermined time falls below the predetermined pressure change amount limit value, that is, a part where the influence of the pressure fluctuation caused by the engine drive is small is detected. In addition to being able to use it as an atmospheric pressure value without increasing the cost, it has been confirmed that it is within the generally assumed atmospheric pressure range, thereby recognizing irregular values as atmospheric pressure. Can easily avoid this risk.

また、この大気圧値を所定回数連続して算出し、さらにその回数分の大気圧値の平均値が予め定めた最低圧力値と最高圧力値の範囲内に収まっている場合に、これを大気圧データとして記憶しまたは出力してエンジン制御用データとして利用するものとした。   In addition, when the atmospheric pressure value is calculated continuously a predetermined number of times, and the average value of the atmospheric pressure values within the predetermined number of times is within a predetermined range between the minimum pressure value and the maximum pressure value, this value is increased. The data is stored or output as atmospheric pressure data and used as engine control data.

このような手順とすることで、仮に測定値にイレギュラーを含む場合であってもその影響を小さくすることができ、より正確な大気圧データとしてエンジンの制御に有効に利用できるものとなる。   By adopting such a procedure, even if the measured value includes irregularity, the influence can be reduced, and it can be effectively used for engine control as more accurate atmospheric pressure data.

本発明によると、コストの高騰を伴うことなく正確な大気圧を連続的に検出可能となり、適正な大気圧補正を行うことを可能とするものである。   According to the present invention, it is possible to continuously detect an accurate atmospheric pressure without causing an increase in cost, and to perform an appropriate atmospheric pressure correction.

以下に、図面を参照して本発明を実施するための最良の形態を説明する。   The best mode for carrying out the present invention will be described below with reference to the drawings.

図１は、本発明の大気圧検出装置を兼ねる電子制御ユニット１０が配置されたエンジンシステムの配置図を示している。エンジン１の気筒には吸気管２が接続されているとともに排気管４が延設されており、吸気管２は入口側にエアクリーナ５を有し、これに続いて絞り弁３が配置されたスロットルボディ２ａを備えている。   FIG. 1 is a layout diagram of an engine system in which an electronic control unit 10 that also serves as an atmospheric pressure detection device of the present invention is disposed. An intake pipe 2 is connected to a cylinder of the engine 1 and an exhaust pipe 4 is extended. The intake pipe 2 has an air cleaner 5 on the inlet side, and a throttle valve 3 is subsequently disposed. A body 2a is provided.

そして、吸気管２に圧力検出手段としての吸気管圧力センサ１１が配設されており、これが配線で電子制御ユニット１０に接続されている。また、このエンジンシステムは、エンジン１に回転数センサ１２が配設されて電子制御ユニット１０が検知した吸気管圧力データおよびエンジン回転数を基に吸入空気量を算出するスピード・デンティシティ方式を採用したものとなっている。   The intake pipe 2 is provided with an intake pipe pressure sensor 11 as pressure detection means, which is connected to the electronic control unit 10 by wiring. The engine system is also provided with a speed-dentity method in which the engine 1 is provided with a rotation speed sensor 12 and the intake air pressure is calculated based on the intake pipe pressure data detected by the electronic control unit 10 and the engine rotation speed. It has been adopted.

尚、電子制御ユニット１０は、ＣＰＵ、ＲＯＭ、ＲＡＭ、入出力インターフェース等を備えて、主としてエンジンの基本的な運転制御を実行するものであって、低価格で一般的なものであり、その記憶手段としてのＲＯＭに、以下に述べるエンジンの大気圧検出装置として作動させるためのプログラムが記憶されたものである。   The electronic control unit 10 includes a CPU, a ROM, a RAM, an input / output interface, and the like, and mainly executes basic operation control of the engine. In the ROM as means, a program for operating as an engine atmospheric pressure detection device described below is stored.

次に、本実施の形態の大気圧検出装置の動作について、図２の吸気管圧力値のグラフおよび図３のフローチャートを用いて詳細に説明する。   Next, the operation of the atmospheric pressure detection device of the present embodiment will be described in detail using the graph of the intake pipe pressure value in FIG. 2 and the flowchart in FIG.

図３のフローチャートを参照して、大気圧検出装置はエンジン運転中において、連続する各Ｔ時間中の吸気管圧力値P（図２参照）を、吸気管圧力センサ１１を用いて連続的に測定する（Ａ１）。   Referring to the flowchart of FIG. 3, the atmospheric pressure detection device continuously measures the intake pipe pressure value P (see FIG. 2) during each continuous T time using the intake pipe pressure sensor 11 during engine operation. (A1).

そして、そのＴ時間中の吸気管圧力値Pが、最低圧力値Pmin＜P＜最高圧力値Pmaxかつ、吸気管圧力変化量ΔP≦変化量リミット値ΔPlimitであるか否かを判定する（Ａ２）。即ち、最低圧力値Pminと最高圧力値Pmaxの間に収まるとともに変化量リミット値ΔPlimit以下である場合を正常とし（Ａ３）、最低圧力値Pminと最高圧力値Pmaxの間に収まらないか変化量リミット値ΔPlimitを超える場合はイレギュラー値であると判定して、最初に（Ａ１）に戻るものとした。尚、最低圧力値Pmin、最高圧力値Pmax、変化量リミット値ΔPlimitは予め適正な値を決定して大気圧検出装置を兼ねる電子制御ユニット１０の記憶手段に記憶されたものである。   Then, it is determined whether or not the intake pipe pressure value P during the time T satisfies the minimum pressure value Pmin <P <maximum pressure value Pmax and the intake pipe pressure change amount ΔP ≦ change amount limit value ΔPlimit (A2). . That is, it is normal if it falls between the minimum pressure value Pmin and the maximum pressure value Pmax and is not more than the change amount limit value ΔPlimit (A3), and the change amount limit does not fit between the minimum pressure value Pmin and the maximum pressure value Pmax. When the value ΔPlimit is exceeded, it is determined that the value is irregular, and the process first returns to (A1). The minimum pressure value Pmin, the maximum pressure value Pmax, and the change amount limit value ΔPlimit are determined in advance and stored in the storage means of the electronic control unit 10 that also serves as the atmospheric pressure detection device.

このように、吸気管圧力変化量ΔPが予め定めた変化量リミット値ΔPlimit以内であるか否かを判定することで、図２に示す吸気管圧力値Pのグラフのうち平坦な部分を検出することができ通常これを大気圧として用いるものであるが、さらに図２に示すように、一般的に想定される大気圧の変動範囲である最低圧力値Pminと最高圧力値Pmaxの間に収まるか否かを判定して、何らかの原因で吸気管圧力値のグラフにおいて大気圧とは異なる位置で平坦部分が生じること等によるイレギュラーな値の採用を回避可能なものとした。   Thus, by determining whether or not the intake pipe pressure change amount ΔP is within the predetermined change amount limit value ΔPlimit, a flat portion is detected in the graph of the intake pipe pressure value P shown in FIG. Usually, this is used as the atmospheric pressure. However, as shown in FIG. 2, does it fall between the lowest pressure value Pmin and the highest pressure value Pmax, which are generally assumed fluctuation ranges of atmospheric pressure? Therefore, it is possible to avoid the use of irregular values due to the occurrence of a flat portion at a position different from atmospheric pressure in the graph of the intake pipe pressure value for some reason.

さらに、Ｔ時間中の吸気管圧力値Pの平均値Paveを算出して大気圧値とし（Ａ４）、この平均値Paveの算出を同様にｎ回実施し、ｎ回分の平均値Ptotalaveを算出する（Ａ５）。このようにすることで、グラフが曲線になるとともに常に変動しやすい吸気管圧力値Pを用いて算出しエンジン制御に用いる大気圧データの適正化をはかることができる。   Further, the average value Pave of the intake pipe pressure value P during the time T is calculated to obtain the atmospheric pressure value (A4), and the average value Pave is calculated n times in the same manner to calculate the average value Ptotalave for n times. (A5). By doing in this way, it is possible to optimize the atmospheric pressure data that is calculated using the intake pipe pressure value P that tends to be a curve and always varies, and that is used for engine control.

次に、その平均値Ptotalaveが、最小リミット値Ptotalavemin≦Ptotalave≦最大リミット値Ptotalavemaxとなる場合に、大気圧＝平均値Ptotalaveであるものとし、大気圧データとして記憶手段に記憶または更新する（Ａ７）。一方、最小リミット値Ptotalaveminと最大リミット値Ptotalavemaxの間に収まらない場合は、イレギュラー値であると判定して、最初（Ａ１）に戻る。尚、最小リミット値Ptotalaveminおよび最大リミット値Ptotalavemaxも、予め適正な値を決定して電子制御ユニット１０の記憶手段に記憶されたものである。   Next, when the average value Ptotalave satisfies the minimum limit value Ptotalavemin ≦ Ptotalave ≦ maximum limit value Ptotalavemax, it is assumed that atmospheric pressure = average value Ptotalave, and is stored or updated in the storage means as atmospheric pressure data (A7). . On the other hand, if it does not fall between the minimum limit value Ptotalavemin and the maximum limit value Ptotalavemax, it is determined as an irregular value and the process returns to the first (A1). Note that the minimum limit value Ptotalavemin and the maximum limit value Ptotalavemax are also determined in advance and stored in the storage means of the electronic control unit 10.

そして、大気圧検出装置に記憶・更新された大気圧データを用いてエンジン１の運転制御を実行するものであるが、エンジン運転中は常に上述した手順を繰り返して大気圧データを更新するようになっており、このようにすることで、例えばエンジン１を搭載した車両が連続走行して標高が常に変動する場合等においても、きめ細かく対応可能としてエンジン１の運転性能を良好に維持することが容易になるものである。   Then, the operation control of the engine 1 is executed using the atmospheric pressure data stored and updated in the atmospheric pressure detection device. While the engine is operating, the above procedure is always repeated to update the atmospheric pressure data. In this way, for example, even when a vehicle equipped with the engine 1 continuously travels and the altitude constantly fluctuates, it is possible to respond finely and easily maintain the driving performance of the engine 1 satisfactorily. It will be.

尚、本実施の形態において、算出した平均値Ptotalaveを大気圧データとして記憶し、これを運転制御に利用する場合を説明したが、その前段階で検出した大気圧値を大気圧データとして利用する構成としてもエンジン制御のために有用なものとなる。また、本実施の形態においてエンジン１の運転制御を実行する電子制御ユニット１０が大気圧検出装置を兼ねている場合について説明したが、本発明はこれに限定されるものではなく、エンジン運転制御用の制御装置と大気圧検出装置とが別体であってもよいことはいうまでもない。この場合、検出した大気圧データは大気圧検出装置において記憶しないで、エンジン制御用の制御装置に出力して記憶されるような構成としてもよい。   In the present embodiment, the calculated average value Ptotalave is stored as atmospheric pressure data and used for operation control. However, the atmospheric pressure value detected in the previous stage is used as atmospheric pressure data. The configuration is also useful for engine control. Moreover, although the case where the electronic control unit 10 that executes the operation control of the engine 1 also serves as the atmospheric pressure detection device has been described in the present embodiment, the present invention is not limited to this and is for engine operation control. It goes without saying that the control device and the atmospheric pressure detection device may be separate. In this case, the configuration may be such that the detected atmospheric pressure data is not stored in the atmospheric pressure detection device but is output and stored in the control device for engine control.

本発明における実施の形態の大気圧検出装置を搭載したエンジンシステムの配置図。1 is a layout diagram of an engine system equipped with an atmospheric pressure detection device according to an embodiment of the present invention. 図１の大気圧検出装置が測定する吸気管力値のグラフ。The graph of the intake pipe force value which the atmospheric pressure detection apparatus of FIG. 1 measures. 図１の大気圧検出装置の動作を説明するためのフローチャート。The flowchart for demonstrating operation | movement of the atmospheric pressure detection apparatus of FIG.

符号の説明Explanation of symbols

１ エンジン、 ２ 吸気管、 １０ 電子制御ユニット、 １１ 吸気管圧力センサ、 １２ 回転数センサ
DESCRIPTION OF SYMBOLS 1 Engine, 2 Intake pipe, 10 Electronic control unit, 11 Intake pipe pressure sensor, 12 Rotation speed sensor

Claims (2)

吸気管圧力センサで測定した吸気管圧力値に基いて、電子制御装置が運転制御を行うエンジンの制御システムに用いられる大気圧検出装置において、前記吸気管圧力センサで連続的に吸気管圧力を測定し、所定時間中の吸気管圧力値が予め定めた下限圧力値と上限圧力値の範囲内で、且つ前記所定時間中の吸気管圧力変化量が予め定めた圧力変化量リミット値以下に収まる場合に、前記所定時間中の吸気管圧力の平均値を算出して、大気圧値として用いることを特徴とする大気圧検出装置。   Based on the intake pipe pressure value measured by the intake pipe pressure sensor, the intake pipe pressure sensor continuously measures the intake pipe pressure in the atmospheric pressure detection device used in the engine control system that is controlled by the electronic control unit. When the intake pipe pressure value during the predetermined time is within the range between the predetermined lower limit pressure value and the upper limit pressure value, and the intake pipe pressure change amount during the predetermined time is less than or equal to the predetermined pressure change amount limit value In addition, an average value of the intake pipe pressure during the predetermined time is calculated and used as an atmospheric pressure value. 前記大気圧値を所定回数連続して算出するとともに、前記所定回数分の大気圧値の平均値が予め定めた最低圧力値と最高圧力値の範囲内に収まっている場合に、前記大気圧の平均値を大気圧データとして記憶手段に記憶しまたは出力してエンジン制御用データとして利用する請求項１に記載した大気圧検出装置。
The atmospheric pressure value is continuously calculated a predetermined number of times, and when the average value of the atmospheric pressure values for the predetermined number of times is within a predetermined range of the minimum pressure value and the maximum pressure value, The atmospheric pressure detection apparatus according to claim 1, wherein the average value is stored or output as atmospheric pressure data in a storage means and used as engine control data.
JP2005356015A 2005-12-09 2005-12-09 Atmospheric pressure detection device for engine Pending JP2007162480A (en)

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JP2005356015A JP2007162480A (en) 2005-12-09 2005-12-09 Atmospheric pressure detection device for engine
KR1020060094905A KR20070061314A (en) 2005-12-09 2006-09-28 Atmospheric pressure detecting apparatus of engine

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015190402A (en) * 2014-03-28 2015-11-02 マツダ株式会社 atmospheric pressure measuring device
CN110397526A (en) * 2019-08-15 2019-11-01 江门市大长江集团有限公司 Engine and its pressure measuring mechanism

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02256853A (en) * 1989-03-29 1990-10-17 Japan Electron Control Syst Co Ltd Intake pressure detection self-diagnosis device for internal combustion engine
JPH0544564A (en) * 1991-08-08 1993-02-23 Nippondenso Co Ltd Atmospheric pressure detecting device for controlling enigne
JP2002030981A (en) * 2000-07-18 2002-01-31 Denso Corp Atmospheric pressure detecting device

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH02256853A (en) * 1989-03-29 1990-10-17 Japan Electron Control Syst Co Ltd Intake pressure detection self-diagnosis device for internal combustion engine
JPH0544564A (en) * 1991-08-08 1993-02-23 Nippondenso Co Ltd Atmospheric pressure detecting device for controlling enigne
JP2002030981A (en) * 2000-07-18 2002-01-31 Denso Corp Atmospheric pressure detecting device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2015190402A (en) * 2014-03-28 2015-11-02 マツダ株式会社 atmospheric pressure measuring device
CN110397526A (en) * 2019-08-15 2019-11-01 江门市大长江集团有限公司 Engine and its pressure measuring mechanism

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