JPH0345332B2 - - Google Patents
Info
- Publication number
- JPH0345332B2 JPH0345332B2 JP16360282A JP16360282A JPH0345332B2 JP H0345332 B2 JPH0345332 B2 JP H0345332B2 JP 16360282 A JP16360282 A JP 16360282A JP 16360282 A JP16360282 A JP 16360282A JP H0345332 B2 JPH0345332 B2 JP H0345332B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- difference
- signal
- value
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 238000004880 explosion Methods 0.000 claims description 21
- 238000000034 method Methods 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 238000010586 diagram Methods 0.000 description 7
- 238000007493 shaping process Methods 0.000 description 5
- 239000000446 fuel Substances 0.000 description 4
- 238000005259 measurement Methods 0.000 description 3
- 230000000737 periodic effect Effects 0.000 description 3
- 101100191136 Arabidopsis thaliana PCMP-A2 gene Proteins 0.000 description 2
- 101100422768 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) SUL2 gene Proteins 0.000 description 2
- 101100048260 Saccharomyces cerevisiae (strain ATCC 204508 / S288c) UBX2 gene Proteins 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 2
- 230000010355 oscillation Effects 0.000 description 2
- 230000010349 pulsation Effects 0.000 description 2
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 239000000696 magnetic material Substances 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M15/00—Testing of engines
- G01M15/04—Testing internal-combustion engines
- G01M15/042—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12
- G01M15/046—Testing internal-combustion engines by monitoring a single specific parameter not covered by groups G01M15/06 - G01M15/12 by monitoring revolutions
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2200/00—Input parameters for engine control
- F02D2200/02—Input parameters for engine control the parameters being related to the engine
- F02D2200/10—Parameters related to the engine output, e.g. engine torque or engine speed
- F02D2200/1015—Engines misfires
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Force Measurement Appropriate To Specific Purposes (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
【発明の詳細な説明】
本発明は内燃機関の出力変動を測定する方法に
関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for measuring output fluctuations of an internal combustion engine.
近年排気公害防止あるいは省エネルギーの対策
として、エンジンの点火時期や空燃比を最適に調
整するための努力がされているが、点火時期や空
燃比の適否を検出する一手段としてエンジンの出
力変動を測定することが行なわれている。 In recent years, efforts have been made to optimally adjust the ignition timing and air-fuel ratio of engines as a measure to prevent exhaust pollution and save energy, but measuring engine output fluctuations is one way to detect whether the ignition timing and air-fuel ratio are appropriate. things are being done.
この出力変動測定の従来方法として、エンジン
の回転数の変動を測定する方法があるが、従来方
法はいずれもクランクシヤフト一回転ごとの平均
回転数を測定し、その変動を比較するものであ
る。 As a conventional method for measuring this output fluctuation, there is a method of measuring fluctuations in engine rotation speed, but all conventional methods measure the average rotation speed for each rotation of the crankshaft and compare the fluctuations.
しかしながら、この方法によるときはクランク
シヤフト一回転ごとの平均回転数はエンジンの出
力変動以外に路面の凹凸によるエンジンの負荷変
動によつても大きく影響され、出力変動を厳密に
検出することはできない。 However, when using this method, the average rotational speed per revolution of the crankshaft is greatly affected not only by engine output fluctuations but also by engine load fluctuations due to unevenness of the road surface, and output fluctuations cannot be accurately detected.
そこで本発明は実質的にエンジンの出力変動の
みに基因するエンジンの回転数、トルクおよび気
筒内圧力の変化のいずれかを検出してより正確に
出力変動を測定する方法を提供することを目的と
するものである。 Therefore, an object of the present invention is to provide a method for more accurately measuring output fluctuations by detecting changes in engine speed, torque, and cylinder pressure that are substantially caused only by engine output fluctuations. It is something to do.
第１図には４サイクル、４気筒エンジンの回転
数の経時変化を示す。各気筒は第１、第３、第
４、第２の順に爆発行程を繰り返しており、図中
N1，N1′は第１気筒の爆発行程における回転数変
化を示し、N2，N3，N4はそれぞれ第２、第３、
第４の各気筒の爆発行程における回転数変化を示
す。 FIG. 1 shows the change over time in the rotational speed of a 4-cycle, 4-cylinder engine. Each cylinder repeats the explosion stroke in the order of 1st, 3rd, 4th, and 2nd.
N 1 , N 1 ′ represent the rotational speed changes during the explosion stroke of the first cylinder, and N 2 , N 3 , N 4 represent the changes in the rotation speed during the explosion stroke of the first cylinder, and the
It shows the change in rotational speed during the explosion stroke of each fourth cylinder.
このようにエンジンの回転数変化をミクロ的に
観察すると、エンジンの回転数変化はアクセル操
作や上記負荷変動に基因する比較的周期の長い回
転数変化に各気筒の爆発行程で生じる短かい周期
の脈動的な回転数変化が重畳している。エンジン
のトルクあるいは気筒内圧力についても同様に脈
動的変化が現われる。 If we observe changes in engine speed from a microscopic perspective, we can see that changes in engine speed consist of relatively long-cycle changes in engine speed caused by accelerator operation and the above-mentioned load fluctuations, and short-cycle changes that occur during the explosion stroke of each cylinder. Pulsating rotational speed changes are superimposed. Similarly, pulsating changes appear in engine torque or cylinder pressure.
本発明は内燃機関の爆発行程にあらわれる上記
脈動的な回転数、トルクあるいは気筒内圧力の変
化に着目してなされたもので、多気筒内燃機関の
特定気筒の爆発行程内の第１所定クランク角に於
ける回転数、トルクまたは気筒内圧力のいずれか
を第１の値として検出し、前記気筒の前記爆発行
程と同一爆発行程内の第２所定クランク角に於け
る回転数、トルク、または気筒内圧力のいずれか
を第２の値として検出し、前記第１の値と第２の
値の差を第１の差分として求め、前記気筒の前記
爆発行程の異なる爆発行程内の、前記第１所定ク
ランク角、及び前記第２所定クランク角に於ける
回転数、トルク、または気筒内圧力のいずれか
を、それぞれ第３、第４の値として検出し、該第
３の値と第４の値の差を第２の差分として求め、
前記第１の差分と第２の差分の差を検出し、該差
に基づき内燃機関の出力変動を検知するものであ
る。 The present invention has been made by focusing on the above-mentioned pulsating changes in rotational speed, torque, or cylinder pressure that appear during the explosion stroke of an internal combustion engine. The rotation speed, torque, or cylinder pressure at a second predetermined crank angle within the same explosion stroke as the explosion stroke of the cylinder is detected as a first value. One of the internal pressures is detected as a second value, the difference between the first value and the second value is determined as a first difference, and the first difference is determined in a different explosion stroke of the explosion stroke of the cylinder. The rotation speed, torque, or cylinder pressure at a predetermined crank angle and the second predetermined crank angle are detected as third and fourth values, respectively, and the third value and the fourth value are detected. Find the difference between as the second difference,
The difference between the first difference and the second difference is detected, and the output fluctuation of the internal combustion engine is detected based on the difference.
かかる本発明において、前記第１の差分と第２
の差分の差は負荷変動等によるものが排除されて
正確に内燃機関の出力変動のみに対応している。 In this invention, the first difference and the second difference
The difference in the difference corresponds only to the output fluctuation of the internal combustion engine, excluding factors such as load fluctuation.
以下図示の実施例により本発明を説明する。 The present invention will be explained below with reference to the illustrated embodiments.
第２図は本発明を実施する装置の構成をモデル
的に示すもので、図中Ｅは出力変動測定対象たる
４サイクル、４気筒のエンジンで、そのクランク
シヤフト１の先端に位置するプーリ２には角度信
号板３が取り付けてある。角度信号板３は磁性体
の円板で、その周上には12枚の歯が形成してあ
る。４は上記信号板３の歯と対向するように設け
た角度信号センサで、シヤフト１と一体回転する
上記信号板３の各歯の通過毎にパルス信号を出力
する。したがつてセンサ４はシヤフト１の一回転
で12パルスの信号を出力する。またシヤフト１は
第１気筒より第４気筒まで爆発行程が一巡する間
に２回転する。 Fig. 2 shows a model of the configuration of an apparatus for carrying out the present invention. An angle signal plate 3 is attached. The angle signal plate 3 is a disk made of magnetic material, and 12 teeth are formed on its circumference. Reference numeral 4 denotes an angle signal sensor provided so as to face the teeth of the signal plate 3, which outputs a pulse signal every time each tooth of the signal plate 3, which rotates integrally with the shaft 1, passes. Therefore, the sensor 4 outputs a signal of 12 pulses per revolution of the shaft 1. Further, the shaft 1 rotates twice during one cycle of the explosion stroke from the first cylinder to the fourth cylinder.
５はデイストリビユータ、６はデイストリビユ
ータ５に内蔵された気筒判別センサで、第１気筒
の圧縮上死点にてパルス信号を出力する。７は出
力変動の演算ユニツトであり、上記角度信号セン
サ４および気筒判別センサ６のパルス信号が入力
する。 5 is a distributor, and 6 is a cylinder discrimination sensor built into the distributor 5, which outputs a pulse signal at the compression top dead center of the first cylinder. Reference numeral 7 denotes an output fluctuation calculation unit, into which pulse signals from the angle signal sensor 4 and cylinder discrimination sensor 6 are input.
第３図は演算ユニツト７の構成を示すもので、
図中７１Ａ，７１Ｂは波形整形回路、７２は計数
回路、７３は読込回路、７４はマイクロコンピユ
ータ、７５はデジタル−アナログ（Ｄ／Ａ）変換
器である。 FIG. 3 shows the configuration of the calculation unit 7.
In the figure, 71A and 71B are waveform shaping circuits, 72 is a counting circuit, 73 is a reading circuit, 74 is a microcomputer, and 75 is a digital-to-analog (D/A) converter.
角度信号センサ４のパルス信号は波形整形回路
７１Ａを経て計数回路７２に入力される。計数回
路７２では上記パルス信号の周期を計数する。パ
ルス信号はクランクシヤフト一回転につき12パル
ス出力されるから、その周期はシヤフト１が30度
回転する周期である。計数回路７２の出力はコン
ピユータ７４に入力される。 The pulse signal from the angle signal sensor 4 is input to the counting circuit 72 via the waveform shaping circuit 71A. A counting circuit 72 counts the period of the pulse signal. Since 12 pulse signals are output per crankshaft rotation, the period is the period in which shaft 1 rotates 30 degrees. The output of the counting circuit 72 is input to a computer 74.
一方、気筒判別センサ６の判別信号は波形整形
回路７１Ｂ、読込回路７３を経てコンピユータ７
４に入力される。上記コンピユータ７４で演算さ
れたエンジンの回転数ないしトルク変動量はＤ／
Ａ変換器７５でアナログ信号に変換され、図示し
ない空燃比制御装置あるいは点火時期制御装置に
送られる。 On the other hand, the discrimination signal from the cylinder discrimination sensor 6 is sent to the computer 7 via a waveform shaping circuit 71B and a reading circuit 73.
4 is input. The engine speed or torque fluctuation calculated by the computer 74 is D/
The signal is converted into an analog signal by the A converter 75 and sent to an air-fuel ratio control device or an ignition timing control device (not shown).
第４図に計数回路７２の回路例を示す。図中７
２１は水晶振動子を使用した発振回路、７２２は
分周回路で、端子CKに入力する発振回路７２１
の出力を分周して端子Ｑに出力する。７２３はカ
ウンタで、端子Ｒの入力が「０」レベルの場合
に、端子CEと接続された出力端子Ｑ４が「１」
レベルになるまで端子CLに入力するクロツクパ
ルスをカウントする。この間に他の出力端子Ｑ
１，Ｑ３よりパルス信号が発生せられる。 FIG. 4 shows a circuit example of the counting circuit 72. 7 in the diagram
21 is an oscillation circuit using a crystal resonator, 722 is a frequency dividing circuit, and the oscillation circuit 721 inputs to the terminal CK.
The output of is divided and output to terminal Q. 723 is a counter, and when the input of the terminal R is at the "0" level, the output terminal Q4 connected to the terminal CE is "1".
Count the clock pulses input to terminal CL until the level is reached. During this time, other output terminal Q
A pulse signal is generated from Q1 and Q3.
７２４，７２５はそれぞれ４ビツト、12ビツト
のバイナリカウンタで、直列に接続されて16ビツ
トのカウンタとしてある。端子CKは入力端子、
端子CLRは出力クリア端子、端子Ｑは出力端子
である。７２６Ａ，７２６Ｂ，７２６Ｃ，７２６
Ｄは４ビツトのデータラツチで、端子CKに入力
するパルス信号のタイミングで端子Ｄへの入力信
号を記憶し、かつ端子Ｑへ出力する。７２７はバ
スラインＢとのインターフエース回路で、３ステ
ートバツフアより成る。バスラインＢはライン
BOよりＢ１１までの12ビツト用である。 724 and 725 are 4-bit and 12-bit binary counters, respectively, which are connected in series to form a 16-bit counter. Terminal CK is an input terminal,
Terminal CLR is an output clear terminal, and terminal Q is an output terminal. 726A, 726B, 726C, 726
D is a 4-bit data latch, which stores the input signal to the terminal D at the timing of the pulse signal input to the terminal CK, and outputs it to the terminal Q. 727 is an interface circuit with bus line B, which is composed of a 3-state buffer. Bus line B is the line
This is for 12 bits from BO to B11.
以下第５図のタイムチヤートに基づき、計数回
路７２の作動を説明する。上記波形整形回路７１
Ａで整形された角度検出センサ４の出力パルス信
号すなわちクランクシヤフト１の30度回転周期信
号７１ａ（第５図１）はカウンタ７２３の端子Ｒ
に入力される。カウンタ７２３は周期信号７１ａ
が「０」レベルの間に出力端子Ｑ４がカウントア
ツプするまでカウント動作を行ない、その出力端
子Ｑ１，Ｑ３からそれぞれパルス信号７２３ａ
（第５図２），７２３ｂ（第５図３）を出力する。
この時のインバータ７２８の出力信号７２８ａを
第５図４に示す。上記信号７２８ａが「１」レベ
ルの時NANDゲート７２９が開き、分周回路７
２２の出力パルスがカウント７２４の端子CKに
入力されてカウントされ、カウンタ７２４，７２
５の端子Ｑにはクランクシヤフト１の30度回転周
期に比例した16ビツトのバイナリデータＴが出力
される。上記NANDゲート７２９の出力信号７
２９ａを第５図５に示す。 The operation of the counting circuit 72 will be explained below based on the time chart shown in FIG. The above waveform shaping circuit 71
The output pulse signal of the angle detection sensor 4 shaped by A, that is, the 30 degree rotation period signal 71a of the crankshaft 1 (FIG. 5 1) is sent to the terminal R of the counter 723.
is input. The counter 723 receives the periodic signal 71a
The count operation is performed until the output terminal Q4 counts up while the output terminal Q4 is at "0" level, and the pulse signal 723a is output from the output terminals Q1 and Q3, respectively.
(Fig. 5 2), 723b (Fig. 5 3) are output.
The output signal 728a of the inverter 728 at this time is shown in FIG. When the signal 728a is at the "1" level, the NAND gate 729 opens and the frequency dividing circuit 7
22 output pulses are input to the terminal CK of the counter 724 and counted, and the output pulses of the counters 724, 72
16-bit binary data T proportional to the 30 degree rotation period of the crankshaft 1 is output to the terminal Q of the crankshaft 1. Output signal 7 of the above NAND gate 729
29a is shown in FIG.
カウンタ７２４，７２５の回転周期データＴは
信号７２３ａのタイミングでデータラツチ７２６
Ａ〜７２６Ｄに移つて記憶されるとともにその端
子Ｑより出力される。またカウンタ７２４，７２
５の出力は信号７２３ｂのタイミングでリセツト
される。 The rotation period data T of the counters 724 and 725 is sent to the data latch 726 at the timing of the signal 723a.
The data is transferred to A to 726D and stored, and is output from the terminal Q thereof. Also counters 724, 72
The output of 5 is reset at the timing of signal 723b.
データラツチ７２６Ａ〜７２６Ｄの回転周期デ
ータＴはコンピユータ７４が発するリードパルス
信号SEL１，SEL２、Ｉ／Ｏのタイミングで12ビ
ツトと４ビツトの２回に分けてインターフエース
回路７２７を介し、バスラインＢを経てコンピユ
ータ７４に読込まれる。 The rotation period data T of the data latches 726A to 726D is divided into two parts, 12 bits and 4 bits, at the timing of the read pulse signals SEL1, SEL2 and I/O issued by the computer 74, and is sent via the interface circuit 727 and the bus line B. It is read into the computer 74.
第６図には読込回路７３の回路例を示す。波形
整形回路７１Ｂで整形された気筒判別信号７１ｂ
はコンピユータ７４が発するリードパルス信号
SEL３、Ｉ／Ｏのタイミングで３ステートバツフ
ア７３１を介し、バスラインＢのMSBラインＢ
１１を経てコンピユータ７４に読込まれる。 FIG. 6 shows a circuit example of the reading circuit 73. Cylinder discrimination signal 71b shaped by waveform shaping circuit 71B
is the read pulse signal issued by the computer 74
MSB line B of bus line B via 3-state buffer 731 at SEL3, I/O timing.
11 and is read into the computer 74.
次にコンピユータ７４内で行なわれる回転数変
動の算出手段を第７図、第８図により説明する。 Next, the means for calculating rotational speed fluctuations performed within the computer 74 will be explained with reference to FIGS. 7 and 8.
第７図１に気筒判別信号７１ｂを示す。信号７
１ｂは第１気筒が上死点に達したしばらく後から
クランクシヤフト１が30度回転したしばらく後ま
で「０」レベルとなる。 FIG. 71 shows the cylinder discrimination signal 71b. signal 7
1b remains at the "0" level from a while after the first cylinder reaches top dead center until a while after the crankshaft 1 has rotated 30 degrees.
第７図２には回転周期信号７１ａを示す。信号
７１ａの各パルスの番号はクランクシヤフト１が
第１気筒上死点から30度回転する毎に順次したも
ので、第１気筒は０ないし５に対応し、以下順次
第３、第４、第２の各気筒に対応して23まで付し
てある。 FIG. 72 shows the rotation period signal 71a. The number of each pulse of the signal 71a is sequentially numbered every time the crankshaft 1 rotates 30 degrees from the top dead center of the first cylinder. Up to 23 are assigned corresponding to each cylinder of 2.
さて、回転周期信号７１ａの立下り毎にコンピ
ユータ７４には割込信号が発せられ、第８図にフ
ローチヤートを示す回転数変動演算プログラムが
起動する。 Now, every time the rotation period signal 71a falls, an interrupt signal is issued to the computer 74, and the rotation speed fluctuation calculation program whose flowchart is shown in FIG. 8 is activated.
上記演算プログラムはステツプ801にて割込前
のレジスタの内容をメモリに退避し、次にステツ
プ802にてリードパルス信号SEL３を発してバス
Ｂに現われた気筒判別信号７１ｂをレジスタＡ１
に読込む。ステツプ803にてレジスタＡ１のMSB
すなわち気筒判別信号７１ｂのレベルを判定し、
第１気筒の爆発行程開始を示す「０」レベルであ
る場合にはステツプ805にてカウント用メモリｍ
をクリアする。「１」レベルの場合にはステツプ
804にてメモリｍに１を加える。ステツプ806では
メモリｍの内容が１、３、７、９、13、15、19、
21のいずれがであればステツプ807以降に進み、
それ以外はステツプ815ヘジヤンプして処理を終
える。 The above calculation program saves the contents of the register before the interrupt to the memory in step 801, and then issues the read pulse signal SEL3 in step 802 and transfers the cylinder discrimination signal 71b appearing on bus B to register A1.
Read into. MSB of register A1 at step 803
That is, the level of the cylinder discrimination signal 71b is determined,
If the level is "0" indicating the start of the explosion stroke of the first cylinder, in step 805 the count memory m
Clear. If the level is “1”, step
804 adds 1 to memory m. At step 806, the contents of memory m are 1, 3, 7, 9, 13, 15, 19,
If any of 21 is true, proceed to step 807 and onwards.
Otherwise, jump to step 815 and finish the process.
ステツプ807ではリードパルス信号SEL１，
SEL２を発し、計数回路７２（第４図参照）より
レジスタＡ２に回転周期データＴを読込む。続く
ステツプ808にてレジスタＡ２の内容すなわち回
転周期データＴの逆数をとり、適当な比例定数Ｋ
を乗じて平均回転数を算出し、レジスタＡ３に格
納する。レジスタＡ３の内容はステツプ809にて
メモリNb、ｍに記憶される。このメモリNb、ｍ
はメモリｍのとりうる値、すなわち１、３、７、
９、13、15、19、21に対応して８個準備される。
すなわちNb、１には第１気筒の爆発行程におい
てクランクシヤフト１が30度から60度まで回転す
る場合の平均回転数が記憶され、メモリNb、21
には回転数変動測定サイクルの最後の気筒である
第２気筒の爆発行程においてクランクシヤフト１
が90度から120度まで回転する場合の平均回転数
が記憶される。 In step 807, the read pulse signal SEL1,
SEL2 is issued and the rotation period data T is read into the register A2 from the counting circuit 72 (see FIG. 4). In the following step 808, the content of register A2, that is, the reciprocal of the rotation period data T, is taken, and an appropriate proportionality constant K is obtained.
The average number of revolutions is calculated by multiplying by , and is stored in register A3. The contents of register A3 are stored in memory Nb,m in step 809. This memory Nb, m
is the possible value of memory m, i.e. 1, 3, 7,
Eight pieces are prepared corresponding to 9, 13, 15, 19, and 21.
That is, the average rotation speed when the crankshaft 1 rotates from 30 degrees to 60 degrees during the explosion stroke of the first cylinder is stored in Nb, 1, and the memory Nb, 21
In this case, during the explosion stroke of the second cylinder, which is the last cylinder in the rotation speed fluctuation measurement cycle, the crankshaft 1
The average number of rotations when rotating from 90 degrees to 120 degrees is stored.
ステツプ810ではメモリｍの内容が３、９、15、
21のいずれかであればステツプ811以降に進み、
それ以外はステツプ815へジヤンプして処理を終
える。ステツプ811では前ステツプ807、808、809
で算出されてメモリNb、ｍに記憶した所定の気
筒の所定のクランクシヤフト回転角における平均
回転数と前測定サイクルで算出してメモリNa、
ｍに記憶した所定の気筒の所定のクランクシヤフ
ト回転角における平均回転数とから所定の気筒の
回転変動△Nmを計算する。この計算式を次式で
示す。 At step 810, the contents of memory m are 3, 9, 15,
If it is one of 21, proceed to step 811 or later.
Otherwise, the process jumps to step 815 and ends the process. In step 811, previous steps 807, 808, 809
The average rotation speed at a predetermined crankshaft rotation angle of a predetermined cylinder calculated in the memory Nb, m and stored in the memory Na, calculated from the previous measurement cycle.
The rotational fluctuation ΔNm of a predetermined cylinder is calculated from the average rotational speed of the predetermined cylinder at a predetermined crankshaft rotation angle stored in m. This calculation formula is shown below.
△Nm＝Na，ｍ−2−Na、ｍ−（Nb，ｍ−2−
Nb，ｍ） ……(a)
上式(a)中、ｍは第１、第３、第４、第２の各気
筒に対応して３、９、15、21の値となる。△Nm=Na, m- 2 -Na, m-(Nb, m- 2 -
Nb, m)...(a) In the above formula (a), m takes values of 3, 9, 15, and 21 corresponding to the first, third, fourth, and second cylinders.
ステツプ812では前ステツプ811で計算した各気
筒の回転数変動△NmをＤ／Ａ変換器７５（第３
図参照）に出力する。ステツプ813ではメモリｍ
の内容をチエツクし、その内容が21であればステ
ツプ814に進み、それ以外はステツプ815にジヤン
プして処理を終える。ステツプ814ではｍ＝１、
３、７、９、13、15、19、21についてメモリNb，
ｍ内容をメモリNa，ｍに移す。ステツプ815では
演算プログラムの最初にメモリに退避した割込前
のレジスタの内容を復帰する。 In step 812, the rotational speed fluctuation △Nm of each cylinder calculated in the previous step 811 is transferred to the D/A converter 75 (third
(see figure). In step 813, memory m
If the content is 21, the process advances to step 814; otherwise, the process jumps to step 815 and ends the process. In step 814, m=1,
Memory Nb for 3, 7, 9, 13, 15, 19, 21,
Move the contents of m to memory Na,m. In step 815, the contents of the register before the interrupt, which were saved in memory at the beginning of the arithmetic program, are restored.
上記回転数変動演算プログラムは周期信号７１
ａの立下りごとに起動せしめられ、メモリNa，
ｍないしメモリNb，ｍには第７図３に模式的に
示すような平均回転数が記憶される。図中棒グラ
フの高さは平均回転数の大きさを示し、各グラフ
の上部に各平均回転数が記憶されるメモリを示
す。図は第３気筒の爆発行程中クランクシヤフト
１が60度を過ぎた状態である。 The above rotation speed fluctuation calculation program is based on the periodic signal 71.
It is activated every time a falls, and the memory Na,
The average rotational speed as schematically shown in FIG. 7 is stored in m or memory Nb,m. The height of the bar graph in the figure indicates the size of the average rotation speed, and the upper part of each graph indicates the memory in which each average rotation speed is stored. The figure shows a state in which the crankshaft 1 has exceeded 60 degrees during the explosion stroke of the third cylinder.
クランクシヤフト１の30度毎の平均回転数は各
気筒の爆発行程に伴なつて図中点線で示すように
周期的な脈動を示す。コンピユータ７４では第８
図のフローチヤートで示した如く、各気筒の爆発
行程についてクランクシヤフト１の30度から60度
までおよび90度から120度までの平均回転数のみ
を計算している。これを図中実線で示す。そして
例えば第１気筒の回転数変動△N3は上式(a)によ
り
△N3＝Na，1−Na，3−（Nb，1−Nb，3）
で算出され、この回転数変動△N3より第１気筒
の出力変動が知られる。 The average rotational speed of the crankshaft 1 every 30 degrees exhibits periodic pulsations as shown by the dotted line in the figure as the explosion stroke of each cylinder progresses. In the computer 74, the eighth
As shown in the flowchart in the figure, only the average rotational speed of the crankshaft 1 from 30 degrees to 60 degrees and from 90 degrees to 120 degrees is calculated for the explosion stroke of each cylinder. This is shown by the solid line in the figure. For example, the rotational speed fluctuation △N 3 of the first cylinder is calculated by the above formula (a) as △N 3 = Na, 1 − Na, 3 − (Nb, 1 − Nb, 3 ), and this rotational speed fluctuation △N 3 , the output fluctuation of the first cylinder is known.
以上の如く、本発明は内燃機関の出力変動を所
定の気筒の相続く爆発行程における所定タイミン
グの脈動変化量の差によつて測定するようにした
ので、負荷変動やアクセルペダルの操作に影響さ
れることなく、実車走行時にも正確に機関の出力
変動を測定することができ、点火時期や空燃比を
最適に調整することができる。 As described above, the present invention measures the output fluctuation of an internal combustion engine by the difference in the amount of pulsation change at a predetermined timing in successive explosion strokes of a predetermined cylinder, so it is not affected by load fluctuations or accelerator pedal operation. This makes it possible to accurately measure engine output fluctuations even when the vehicle is running, and to optimally adjust ignition timing and air-fuel ratio.
なお、上記実施例ではエンジンの出力変動を回
転数変化によつて測定したが、トルクあるいは気
筒内圧力の変化によつても同様の測定が可能であ
る。 In the above embodiments, engine output fluctuations were measured by changes in engine speed, but similar measurements can also be made by changes in torque or cylinder pressure.
第１図は４サイクル、４気筒のエンジンの回転
数の経時変化を示す図、第２図は本発明を実施す
る装置の構成を示す図、第３図は演算ユニツトの
構成を示す図、第４図は計数回路の回路図、第５
図は計数回路中の各信号のタイムチヤート、第６
図は読込回路の回路図、第７図は気筒判別信号、
回転周期信号のタイムチヤートおよび回転数変動
演算プログラムで演算された回転数を模式的に示
す図、第８図は上記演算プログラムのフローチヤ
ートである。
Ｅ……エンジン、１……クランクシヤフト、３
……角度信号板、４……角度信号センサ、５……
デイストリビユータ、６……気筒判別センサ、７
……演算ユニツト、７２……計数回路、７３……
読込回路、７４……マイクロコンピユータ、７５
……デジタル−アナログ変換器。
FIG. 1 is a diagram showing the change over time in the rotational speed of a 4-cycle, 4-cylinder engine, FIG. 2 is a diagram showing the configuration of an apparatus for implementing the present invention, FIG. Figure 4 is the circuit diagram of the counting circuit, and Figure 5 is the circuit diagram of the counting circuit.
The figure is a time chart of each signal in the counting circuit, 6th
The figure shows the circuit diagram of the reading circuit, Figure 7 shows the cylinder discrimination signal,
FIG. 8 is a diagram schematically showing a time chart of the rotation period signal and the rotation speed calculated by the rotation speed fluctuation calculation program, and FIG. 8 is a flow chart of the calculation program. E...Engine, 1...Crankshaft, 3
...Angle signal board, 4...Angle signal sensor, 5...
Distributor, 6... Cylinder discrimination sensor, 7
... Arithmetic unit, 72 ... Counting circuit, 73 ...
Reading circuit, 74...Microcomputer, 75
...Digital-to-analog converter.
Claims (1)
１所定クランク角に於ける回転速度、トルクまた
は気筒内圧力のいずれかを第１の値として検出
し、前記気筒の前記爆発行程と同一爆発行程内の
第２所定クランク角に於ける回転速度、トルク、
または気筒内圧力のいずれかを第２の値として検
出し、前記第１の値と第２の値の差を第１の差分
として求め、前記気筒の前記爆発行程と異る爆発
行程内の、前記第１所定クランク角、及び前記第
２所定クランク角に於ける回転速度、トルク、ま
たは気筒内圧力のいずれかを、それぞれ第３、第
４の値として検出し、該第３の値と第４の値の差
を第２の差分として求め、前記第１の差分と第２
の差分の差を検出し、該差に基づき内燃機関の出
力変動を検知することを特徴とする内燃機関の出
力変動測定方法。1. Detect either the rotational speed, torque, or cylinder pressure at a first predetermined crank angle within the explosion stroke of a specific cylinder of a multi-cylinder internal combustion engine as a first value, and detect the same explosion as the explosion stroke of the cylinder. Rotational speed and torque at the second predetermined crank angle within the stroke,
Alternatively, one of the cylinder pressures is detected as a second value, and the difference between the first value and the second value is determined as the first difference, and the cylinder pressure is detected as a second value, and the difference between the first value and the second value is determined as the first difference, Either the rotational speed, torque, or cylinder pressure at the first predetermined crank angle and the second predetermined crank angle are detected as third and fourth values, respectively, and the third value and the fourth value are detected. 4 is obtained as a second difference, and the difference between the first difference and the second difference is determined.
1. A method for measuring output fluctuations in an internal combustion engine, comprising: detecting a difference in the difference between the two, and detecting output fluctuations in the internal combustion engine based on the difference.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16360282A JPS5952726A (en) | 1982-09-20 | 1982-09-20 | Measuring method for power variation of internal combustion engine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16360282A JPS5952726A (en) | 1982-09-20 | 1982-09-20 | Measuring method for power variation of internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5952726A JPS5952726A (en) | 1984-03-27 |
| JPH0345332B2 true JPH0345332B2 (en) | 1991-07-10 |
Family
ID=15777040
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16360282A Granted JPS5952726A (en) | 1982-09-20 | 1982-09-20 | Measuring method for power variation of internal combustion engine |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5952726A (en) |
Families Citing this family (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0733809B2 (en) * | 1984-06-27 | 1995-04-12 | 株式会社日本自動車部品総合研究所 | Internal combustion engine output fluctuation measurement method |
| US4697561A (en) * | 1985-04-15 | 1987-10-06 | Purdue Research Foundation | On-line engine torque and torque fluctuation measurement for engine control utilizing crankshaft speed fluctuations |
| US5132909A (en) * | 1990-07-30 | 1992-07-21 | Saturn Corporation | Apparatus for diagnosing individual cylinder performance by estimated instantaneous engine speeds |
| US5182512A (en) * | 1990-10-29 | 1993-01-26 | Snap-On Tools Corporation | Method and apparatus for determining relative contributions of individual cylinders of internal combustion engine using contact tachometer |
| JP2835672B2 (en) * | 1993-01-28 | 1998-12-14 | 株式会社ユニシアジェックス | Surge and torque detector for internal combustion engine |
| CN112161810B (en) * | 2020-08-26 | 2022-09-16 | 深圳市云伽智能技术有限公司 | Method, device, equipment and medium for detecting power of automobile engine |
-
1982
- 1982-09-20 JP JP16360282A patent/JPS5952726A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5952726A (en) | 1984-03-27 |
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