WO2004094807A1 - 多気筒エンジンの燃焼圧データ収集システム - Google Patents
多気筒エンジンの燃焼圧データ収集システム Download PDFInfo
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- WO2004094807A1 WO2004094807A1 PCT/JP2004/005685 JP2004005685W WO2004094807A1 WO 2004094807 A1 WO2004094807 A1 WO 2004094807A1 JP 2004005685 W JP2004005685 W JP 2004005685W WO 2004094807 A1 WO2004094807 A1 WO 2004094807A1
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- cylinder
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- combustion
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- 238000002485 combustion reaction Methods 0.000 title claims abstract description 75
- 238000005259 measurement Methods 0.000 claims abstract description 8
- 238000013480 data collection Methods 0.000 claims description 9
- 238000012937 correction Methods 0.000 claims description 8
- 238000007599 discharging Methods 0.000 claims description 4
- 230000008054 signal transmission Effects 0.000 claims description 4
- 238000012545 processing Methods 0.000 abstract description 5
- 230000005669 field effect Effects 0.000 description 16
- 238000006243 chemical reaction Methods 0.000 description 9
- 239000003990 capacitor Substances 0.000 description 8
- 230000008859 change Effects 0.000 description 8
- 230000006835 compression Effects 0.000 description 8
- 238000007906 compression Methods 0.000 description 8
- 230000007423 decrease Effects 0.000 description 6
- 239000007789 gas Substances 0.000 description 4
- 239000000567 combustion gas Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 241001634822 Biston Species 0.000 description 2
- FFGPTBGBLSHEPO-UHFFFAOYSA-N carbamazepine Chemical compound C1=CC2=CC=CC=C2N(C(=O)N)C2=CC=CC=C21 FFGPTBGBLSHEPO-UHFFFAOYSA-N 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 230000001960 triggered effect Effects 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000004397 blinking Effects 0.000 description 1
- 238000009530 blood pressure measurement Methods 0.000 description 1
- 230000006837 decompression Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
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- 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
- G01L23/22—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 for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines
- G01L23/221—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 for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines
- G01L23/222—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 for detecting or indicating knocks in internal-combustion engines; Units comprising pressure-sensitive members combined with ignitors for firing internal-combustion engines for detecting or indicating knocks in internal combustion engines using piezoelectric devices
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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
- F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
- F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
- F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/28—Interface circuits
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L9/00—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means
- G01L9/08—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of piezoelectric devices, i.e. electric circuits therefor
- G01L9/085—Measuring steady of quasi-steady pressure of fluid or fluent solid material by electric or magnetic pressure-sensitive elements; Transmitting or indicating the displacement of mechanical pressure-sensitive elements, used to measure the steady or quasi-steady pressure of a fluid or fluent solid material, by electric or magnetic means by making use of piezoelectric devices, i.e. electric circuits therefor with temperature compensating means
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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
- F02D41/00—Electrical control of supply of combustible mixture or its constituents
- F02D41/24—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means
- F02D41/26—Electrical control of supply of combustible mixture or its constituents characterised by the use of digital means using computer, e.g. microprocessor
- F02D41/28—Interface circuits
- F02D2041/281—Interface circuits between sensors and control unit
Definitions
- the present invention relates to a combustion pressure data collection system for a multi-cylinder engine that measures combustion pressure for each cylinder and collects combustion pressure data for each cylinder.
- a pressure sensor using a piezoelectric element as disclosed in Japanese Patent No. 3123798 is generally used.
- a charge amplifier is used as an amplifier circuit to convert the charge signal generated by the piezoelectric element into a voltage signal and use it as an input signal for engine control.
- in-cylinder pressure sensors for measuring combustion pressure are generally complicated to handle due to the structure and control including the circuit, and the use of them together with the in-cylinder pressure sensor requires a significant cost. There is a problem that leads to increase.
- the present invention has been made in view of the above circumstances, and has a combustion pressure data of a multi-cylinder engine capable of efficiently collecting combustion pressure data for each cylinder with a simple configuration without requiring complicated processing. It aims to provide a collection system. Disclosure of the invention
- a combustion pressure data collection system for a multi-cylinder engine includes: an in-cylinder pressure sensor that is mounted for each cylinder and outputs a charge signal corresponding to an in-cylinder pressure;
- the amplifier circuit for each cylinder having a reset function of converting the charge signal into a voltage signal and outputting the voltage signal, and discharging the charge by an externally input reset signal, and a signal based on the cylinder discrimination result of the engine,
- FIG. 1 is a configuration diagram of a combustion pressure data collection system
- FIG. 2 is a circuit configuration diagram of an amplifier unit
- FIG. 3 is a circuit configuration diagram of a channel switching unit.
- FIG. 4 is a time chart showing the selection timing of the channel selection signal, the combustion pressure data and the transmission timing of the reset signal
- FIG. 5 is a time chart showing the switching time of the combustion pressure data.
- the combustion pressure data collection system shown in Fig. 1 is an example of application to a four-cylinder engine, and operates on a single power supply using a vehicle-mounted battery.
- the character # ⁇ represents the cylinder number
- the amplifier AP # n that amplifies the signal from the in-cylinder pressure sensor CPS # ⁇
- the engine control electronic control unit (ECU) (not shown) synchronized with the engine rotation.
- the system to be measured is selected from the signals of the plurality of systems from the amplifier unit AP # n according to the channel selection signal of the predetermined pulse train that is output, the combustion pressure data is output to the ECU, and the amplifier unit that completes the measurement is selected. It has a channel switching unit MUX that outputs a reset signal to be described later to the AP # n.
- the internal pressure sensor CPS # n of each cylinder is connected to the corresponding amplifier unit AP # n.Each amplifier unit AP # n has its external connector ACN # n connected to the channel selection unit MUX for each data selection channel. Connected to external connector MC N # n.
- the channel switching unit MUX is further connected to an ECU (not shown) via an external connector CN1.
- the combustion stroke of the engine is # 1 cylinder-# 3 cylinder-> # 2 cylinder-> # 4 cylinder.
- the data selection channel is channel # 1.
- One cylinder, channel CH 2 corresponds to # 3 cylinder, channel CH 3 corresponds to # 2 cylinder, and channel CH 4 corresponds to # 4 cylinder.
- Channel switching unit MU X external connector MCN # 1 is connected to channel CH1, cylinder pressure sensor CPS # 2 of cylinder # 2 and amp unit AP # 2.
- the input / output of the external connector MCN # 2 of X is connected to the in-cylinder pressure sensor CPS # 3 of channel CH3 and cylinder # 3 and the channel switching unit MUX external connector MCN # 3 connected to the amplifier unit AP # 3.
- the input / output of the external connector MC N # 4 of the channel switching unit MUX connected to the in-cylinder pressure sensor CPS # 4 and the amplifier AP # 4 of the channel CH2 and # 4 cylinders corresponds to channel CH4.
- the in-cylinder pressure sensor CPS # n is a sensor using a piezoelectric element, and generates an electric charge proportional to the pressure.
- the amplifier circuit 10 incorporated in each amplifier unit AP # n is a charge-to-voltage conversion amplifier that converts a charge signal into a voltage, and the output level of the amplifier circuit 10 is equal to the in-cylinder pressure sensor CPS # n.
- Automatic correction function to correct the zero point offset due to charge leakage by automatically correcting to the same level at the start and end of charge generation, and a reset signal from the channel switching unit MUX
- a forced reset function for forcibly discharging the charge on the input side of the amplifier circuit 10 is provided.
- Fig. 2 shows a circuit example of the amplifier circuit 10, which amplifies and outputs the voltage of the voltage conversion capacitor Cx and the voltage conversion capacitor CX that store the charge generated by the in-cylinder pressure sensor CPS # n.
- Amplifier A 1 Amplifier A 2 for detecting the negative output (output below “0”) from Amplifier A 1 and automatically correcting the input of Amplifier A 1 to “0”
- a photo for discharging the charge on the input side of the amplifier A1 by forcibly turning on the field effect transistor T1 by a reset signal input from the field effect transistor T1 and the channel switching unit MUX.
- the output side of the in-cylinder pressure sensor CPS # n is connected so that the generated charge is stored in the voltage conversion capacitor CX of the amplifier circuit 10, and is connected to the non-inverting input terminal of the amplifier A1.
- the output terminal of amplifier A1 is branched to three directions via resistor R3, and one is directly connected to board connector CN, and connected to channel switching unit MUX via board connector CN via external connector ACN # n. Is done.
- the other one A2 is connected to the inverting input of amplifier A2 via resistor R4, and the other is connected to the inverting input of amplifier A1 via resistors VR1 and R2 to set the gain of amplifier A1. Grounded through one.
- the amplifier A 2 is an inverting amplifier that detects a negative output from the amplifier A 1, and its inverting input terminal is connected to the output terminal of the amplifier A 1 via the resistors R 3 and R 4, and the non-inverting amplifier is used.
- a reference voltage V ref (for example, +2 mV) obtained by dividing the circuit voltage V cc (for example, + DC5 V) by the resistors R5 and R6 is applied to the input terminal.
- This reference voltage V ref is a voltage that determines the "0" point in single power supply operation.
- the amplifier A2 sets the reference voltage V ref to "0", and subtracts a voltage smaller than the reference voltage V ref from the reference voltage V ref. It operates with a voltage higher than the reference voltage V ref as a plus.
- the output terminal of the amplifier A2 is connected to the gate of the field effect transistor T1 via the diode D1.
- the field effect transistor T1 has a gate connected to a gate resistor Rg, a drain connected to a non-inverting input terminal of the amplifier A1 via a resistor Rd, and a source A1 when a source is forcibly reset.
- Connected to the potential point that determines the input voltage of This potential point is set to a voltage Vrt (for example, +6 mV) obtained by dividing the circuit voltage Vcc by the resistors R7 and R8, and is appropriately adjusted depending on the application.
- the output terminal of the photo power blur PC 1 is connected to the gate of the field-effect transistor T 1, and the input terminal of the photo coupler PC 1 is connected to the channel through the external connector A CN # n from the board connector CN. Connected to switching unit MUX.
- the channel switching unit MUX has a built-in switching circuit 20 composed mainly of a multiplexer.
- the switching state of the channel by the switching circuit 20 is displayed by blinking in two bits.
- two light emitting diodes LED 1 and LED 2 are provided, and a switch S 1 for manually switching the pump output at the time of inspection and adjustment is provided.
- the switching circuit 20 is connected to the external connector CN 1 via the board connector CN 2, connected to the switch S 1 via the board connector CN 3, and further connected via the board connectors CN 4 to CN 7.
- the switching circuit 20 as shown in FIG. Two timers IC1 and IC2 that generate a one-shot pulse for each pulse of the signal, a counter IC3 that counts the channel selection signal and generates address data, and an amplifier AP # according to the address data from the counter IC3
- the main configuration is a 2-channel (X, Y-channel) multiplexer IC4 that switches the signal from n and switches the destination using the output from timer IC2 as a reset signal.
- the input end of the photocoupler PC2 is connected to the channel selection signal input pin of the board connector CN2, and the output end of the photocoupler PC2 is connected to one input terminal of the 2-input NAND gate G1. It is connected.
- the other input terminal of the NAND gate G1 is connected to the output terminal of a shunt circuit amplifier A3 for shaping the waveform of a signal input from the switch S1 via the board connector CN3, and is connected to the NAND gate G1.
- the output terminal of the gate G1 is connected to the trigger input (A input) of the timer IC 1 and one input terminal of the 2-input NAND gate G2.
- reference numeral IC6 is a three-terminal regulator that constitutes a power supply circuit.
- the battery voltage Vb (12 V) supplied via the board connector CN3 is stepped down and stabilized, and the circuit power supply + Vcc ( 5 V) is supplied to each unit in the channel switching unit MUX, and is also supplied as power to the amplifier units AP # 1 to AP # 4 connected via the boards CN4 to CN7.
- the Q output of timer IC 1 is connected to the trigger input (B input) of the other timer IC 2 and the clock input (CLK input) end of counter IC 3, and the Q output of timer IC 2 is connected to the NAND gate. It is connected to the other input terminal of G2 and the demultiplexing side (Y input) of one channel of the multiplexer IC4.
- Timers IC1 and IC2 have external resistors R20 and C20, and resistors R21 and C21, respectively, so that the pulse width is set in relation to the channel selection signal from the ECU.
- Timer IC 1 outputs a one-shot pulse of a set pulse width triggered by the rising edge of the output of NAND gate G 1, and timer IC 2 outputs the falling edge of the one-shot pulse of timer IC 1.
- an on-shot pulse having a pulse width shorter than the one-shot pulse of the timer IC 1 is output.
- One-shot pulse of timer IC 1, timer IC The relationship between the one-shot pulse and the channel selection signal from the ECU will be described later.
- the output terminal of the NAND gate G2 is connected to the other input terminal of a two-input NAND gate G3 (ie, an imperter) whose one input terminal is fixed to a logic level "1". Is connected to the reset input (R input) end of counter IC3.
- the counter IC3 is a quaternary counter using the lower output (Q0, Q1) of the hexadecimal counter, and counts up for each pulse of the channel selection signal.
- the lower outputs Q 0 and Q 1 of the counter IC 3 are connected to the control input (A, B input) ends of the multiplexer IC 4 and to the LEDs 1 and 2 via the driver amplifier array IC 5. .
- the multiplexer IC4 is a two-channel analog multiplexer, and switches the internal switch using the output data of the counter IC3 as an address.
- One channel uses the multiplex side X ⁇ , ⁇ ⁇ , ⁇ 2, ⁇ 3 as an input terminal and the demultiplex side X as an output terminal, and the input terminals X ⁇ , ⁇ ⁇ , ⁇ 2, ⁇ 3
- the output terminals X are connected to the amplifier output terminals of the amplifier units AP # 1 to AP # 4 via the amplifiers CN4 to CN7, and the output terminals X are connected to the pump signal output pins of the board connector CN2 via the amplifier A4 for amplification. It is connected.
- the other channel uses the multiplex side ⁇ ⁇ , ⁇ ⁇ , ⁇ 2, ⁇ 3 as the output end, the demultiplex side ⁇ ⁇ ⁇ as the input end, and the output ends ⁇ ⁇ , ⁇ ⁇ , ⁇ 2, ⁇ 3.
- the destination is switched according to the output data of counter IC3.
- the charge signal output according to the pressure from the in-cylinder pressure sensor CPS #n is converted into a voltage signal by the amplifier unit AP # n, and the amplifier converted to this voltage signal
- the output signal is output to the channel switching unit MUX.
- the in-cylinder pressure when biston reaches near top dead center, the exhaust valve closes, and the intake valve opens is
- the pressure is the atmospheric pressure.
- the pressure is the atmospheric pressure plus the supercharging pressure (for example, about 66.66 KPa to 199.98 KPa). .
- a charge proportional to the pressure load in the cylinder is generated on the piezoelectric element of the cylinder pressure sensor CPS #n.
- this charge q is stored in the voltage conversion capacitor Cx of the amplifier unit AP # n, converted into a voltage signal + V by the amplifier A1, and output. Therefore, the signal level when the in-cylinder pressure is atmospheric pressure is zero level, and if there is a supercharging pressure, it will eventually be generated as a level obtained by adding the supercharging pressure as a DC voltage component to the zero atmospheric pressure level This is the basic level of the combustion waveform that rises due to the combustion pressure.
- Combustion pressure is generated by ignition immediately before reaching the top dead center (immediately before the compression pressure reaches the maximum value), and the generation of the twisting pressure causes the electric charge of the piezoelectric element to rapidly increase, and the pump A
- the voltage signal + V converted and output at 1 also rises sharply.
- the signal output as the combustion pressure is a signal from the above-described basic level, that is, a level from the atmospheric pressure in a naturally aspirated engine, and a signal from a supercharged engine in a turbocharged engine. This is a superposition of the DC voltage component of the boost pressure.
- the insulation resistance of the signal transmission system between the in-cylinder pressure sensor CPS # n and the amplifier unit AP # n is finite, and some of the charge stored in the voltage conversion capacitor CX leaks.
- the signal voltage which is turned into a negative voltage is superimposed on the output, and the signal voltage to be returned to the initial level at the start of pressurization may reach the negative region. That is, when the pressure is increased from zero and returned to zero again, the charge of the in-cylinder pressure sensor CPS #n becomes negative by the amount of the charge leak, and the zero point of the signal output from the ampunit AP # n The level may fluctuate and prevent accurate measurement.
- the amplifier unit AP # n leaks the charge and returns to zero, and if the amplifier A1 tries to output a negative output, the amplifier A1 detects the negative output of the amplifier A1 as a charge leak.
- the automatic correction function operates and automatically corrects the offset of the zero point due to charge leakage.
- the amplifier A2 inverts and amplifies the negative voltage of the amplifier A1, and applies the amplified output to the gate of the field effect transistor T1.
- the gate voltage of the field-effect transistor T1 is equal to or lower than the threshold voltage Vth (about 1 to 3 V)
- charges are injected into the voltage conversion capacitor CX through the drain-gate capacitance Cdg.
- the gate voltage of the field-effect transistor T1 exceeds the threshold voltage Vth, conduction between the drain and the source starts.
- the electric charge of the sensor is discharged through the field-effect transistor T1, and the voltage at the output terminal of the amplifier A1 and the output terminal of the other amplifier A1 becomes "0" (2 mV).
- the automatic correction function of the amplifier A2 and the field effect transistor T1 forms a kind of negative feedback circuit when the output is negative, and the input of the amplifier A1 is connected to the field effect transistor. Automatic correction is performed by conducting to the zero point at T1, and when the pressure rises thereafter, the minimum pressure (including negative pressure) operates as the zero point, This continues as long as the input of amplifier A1 is in the negative range.
- the gate voltage of the field-effect transistor T1 decreases, the charge stored in the capacitance Cdg between the drain and the gate acts to lower the input voltage of the amplifier A1, and as a result, the amplifier A1 Act to increase the gate voltage through amplifier A2. Conversely, the same applies when the gate voltage increases. Therefore, as long as the other voltage of the amplifier does not fluctuate, the state is maintained, and when the pressure changes from the lowest pressure state to the increase, the output of the amplifier A1 changes to a positive value and increases.
- the amplifier unit AP # n removes the DC component due to the temperature by the forced reset which discharges the electric charge on the input side of the amplifier A1 by the reset signal sent from the channel switching unit MUX.
- the photovoltaic device PC 1 when a reset signal is input from the channel switching unit MUX, the photovoltaic device PC 1 is turned on, and a voltage higher than the threshold voltage Vth is applied to the gate of the field effect transistor T1.
- the field effect transistor T1 conducts.
- the electric charge is discharged regardless of the input state of the sensor signal, the input of the amplifier A1 becomes the voltage Vrt, and the output becomes the value obtained by multiplying the voltage Vrt by the gain of the amplifier A1.
- the gate voltage goes to the gate due to the gate resistance Rg, so that the charge stored in the drain-gate capacitance Cdg is transferred to the voltage conversion capacitor CX below the threshold voltage Vth.
- the input of the amplifier A1 goes in the negative direction.
- the input voltage of the amplifier A1 is 1 V th ⁇ C d (C s + Cx + Cd g + Cd s) (where C s is the stray capacitance of leakage charge, C ds is the capacitance between drain and source), and this voltage is a value sufficient for automatic correction to operate. Whatever the case, the circuit operates with that point as zero. If the pressure drops, automatic compensation works and the minimum pressure point is set to zero.
- the amplifier unit AP # n has an automatic correction function for charge leakage and a reset function for temperature change, and a sudden increase and a subsequent decrease in pressure are continuously repeated, thereby reducing pressure fluctuation. Leakage of charge generated by rapid outflow and inflow of proportional charge can correct the signal level offset accumulated every cycle and reduce output errors due to temperature changes. .
- the combustion pressure data converted into a voltage signal by the amplifier AP # n is switched by the re-channel switching unit MUX according to a channel selection signal transmitted from the ECU and transmitted to the ECU.
- the channel switching unit MUX the pulse train of the channel selection signal is counted by the counter IC3, and the signal from the amplifier unit AP # n is switched according to the counter value.
- the channel selection signal is a signal output based on, for example, a signal output from the crank angle sensor, a signal output from the cam angle sensor, and a result of cylinder discrimination in the ECU. Specifically, as shown in FIGS. 4 and 5, the channel selection signal is composed of a pulse having a pulse width of 2 msec and three pulses having a pulse width of 1 msec following the pulse having a pulse width of 2 msec. 2ms ec pulse corresponds to # 1 cylinder, and the next three 1ms ec pulses correspond to each cylinder in combustion order, i.e., # 3 cylinder, # 2 cylinder, Corresponds to each # 4 cylinder.
- the combustion pressure measurement period of each cylinder is the period of 180 ° CA of crank angle from the compression top dead center to the bottom dead center of each cylinder as shown in Fig. 5, and the combustion period of # 1 cylinder is 2 ms pulse at compression top dead center, # 1 ms pulse at 3 cylinder compression top dead center, # second 1 ms pulse at 2 cylinder compression top dead center, # 4 cylinder compression top dead
- the third 1 ms ec pulse is output, and the measurement data from the start of combustion to the end of combustion in each cylinder is switched to combustion order and transmitted to the ECU.
- the channel switching unit MUX Ima ICI and IC 2 are set to generate 1.5 ms ec and 1 msec one-shot pulses, respectively, to distinguish between 2 ms ⁇ c pulses and 1 msec pulses.
- the counter IC 3 is reset every time a pulse longer than 1.5 msec (that is, a 2 msec pulse) is input in the signal pulse train.
- the channel selection signal is sent to the channel switching unit MUX, it is isolated and inverted by the photo power bracket PC 2 and input to the NAND gate G1, and the same 2msec from the NAND gate G1. (However, here, it is assumed that the manual switching signal by the switch S1 is not input).
- the 2msec pulse from the NAND gate G1 is input to the timer IC1 at the same time as being input to the NAND gate G2, and the rising edge thereof triggers the timer IC1.
- a pulse of 1.5 ms c is output from the timer IC 1.
- the pulse of 1.5 milliseconds is input to the counter IC 3 and counted up, and further input to the timer IC 2.
- Timer IC2 is triggered by the falling edge of the 1.5msc pulse from timer IC1 and outputs a 1msec pulse.
- This 1 msec pulse is input to the NAND gate G2 and to the Y input terminal of the multiplexer IC4.
- the AND of the 2 ms pulse and the 1 ms ⁇ c pulse is output from the NAND gate G 2 to the reset input terminal of the counter IC 3 via the NAND gate G 3 (functioning as an impeller).
- a pulse of 0.5 ms is generated by the pulse of 2 msmsc of the channel selection signal and the pulse of 1 ms from the timer IC 2, and is input to the counter IC 3 as a reset pulse. Therefore, when the 2 ms e-pulse of the channel selection signal is input, the counter IC 3 is once counted up, but is reset immediately and the counter value becomes 0.
- a 1.5 ms ec pulse and a 1 msec pulse are output from timers IC 1 and IC 2, respectively.
- 1 ms ⁇ c pulse and tie Since there is a time lag from the 1 msec pulse from IC2, a reset pulse to counter IC3 is not generated, and counter IC3 is counted up and the power counter value becomes 1.
- the counter IC 3 counts up and increments the counter value. The counter IC 3 is reset by the 2 ms ec pulse and the counter value returns to 0.
- the counter IC 3 is reset, and if shorter than 1.5 msec, the power IC 3 is counted up.
- the counter value (address data) given to the multiplexer IC 4 changes.
- the multiplexer I C4 switches the X channel to the data selection channel corresponding to the combustion start cylinder to be measured, outputs a signal from the corresponding amplifier unit AP # n to the ECU, and outputs the Y channel to the ECU. Switch to the data selection channel corresponding to the combustion end cylinder at which measurement ends, and send a 1 ms ec pulse from timer IC2 as a reset signal to the corresponding amplifier unit AP # n ( Figure 4 time chart) reference).
- the relationship between the counter value, the data selection channel, the reset signal transmission destination, and the cylinder number is as shown below.
- the 2 ms ec pulse input (counter value 0) of the channel selection signal causes the combustion pressure data of cylinder # 1 to be Is selected, and the offset of the zero point in the combustion pressure data of cylinder # 4 (combustion cylinder before cylinder # 1), which ends combustion, is forcibly reset, and the next 1 ms ec pulse input (counter value) According to 1), the combustion pressure data of the # 3 cylinder is selected, and the offset of the zero point in the combustion pressure data of the # 1 cylinder (combustion cylinder before the # 3 cylinder) at which combustion ends is forcibly reset.
- the second 1 ms ec pulse input selects the combustion pressure data of cylinder # 2, and the combustion of cylinder # 3 (combustion cylinder before cylinder # 2), which ends combustion.
- the offset of the zero point in the pressure data is forcibly reset
- the third 1 ms eo pulse input selects the combustion pressure data of # 4 cylinder and terminates combustion #
- the offset of the zero point in the combustion pressure data of cylinder 2 (combustion cylinder before cylinder # 4) is forcibly reset.
- Such a process is repeated, and the combustion pressure data of each cylinder is sequentially switched as shown in FIG. It is transmitted to the ECU as a series of continuous data, enabling optimal combustion control for each cylinder in the ECU.
- the data obtained by measuring the combustion pressure of each cylinder in a multi-cylinder engine is used to calculate the leakage of electric charge from the sensor, the individual difference of the sensor, and the temperature change.
- the data obtained by measuring the combustion pressure of each cylinder in a multi-cylinder engine is used to calculate the leakage of electric charge from the sensor, the individual difference of the sensor, and the temperature change.
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- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
EP04728652A EP1632669A4 (en) | 2003-04-21 | 2004-04-21 | COMBUSTION PRESSURE DATA COLLECTION SYSTEM FOR POLYCRYLINDRICULAR ENGINE |
US11/249,110 US7062955B2 (en) | 2003-04-21 | 2005-10-11 | Combustion-pressure-data acquisition system of multi-cylinder engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2003116073A JP4094475B2 (ja) | 2003-04-21 | 2003-04-21 | 多気筒エンジンの燃焼圧データ収集システム |
JP2003-116073 | 2003-04-21 |
Related Child Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US11/249,110 Continuation US7062955B2 (en) | 2003-04-21 | 2005-10-11 | Combustion-pressure-data acquisition system of multi-cylinder engine |
Publications (1)
Publication Number | Publication Date |
---|---|
WO2004094807A1 true WO2004094807A1 (ja) | 2004-11-04 |
Family
ID=33307973
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2004/005685 WO2004094807A1 (ja) | 2003-04-21 | 2004-04-21 | 多気筒エンジンの燃焼圧データ収集システム |
Country Status (4)
Country | Link |
---|---|
US (1) | US7062955B2 (ja) |
EP (1) | EP1632669A4 (ja) |
JP (1) | JP4094475B2 (ja) |
WO (1) | WO2004094807A1 (ja) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1519176A1 (en) * | 2003-09-19 | 2005-03-30 | Fuji Jukogyo Kabushiki Kaisha | Combustion pressure data collection system with multi-cylinder engine with charge amplifiers with correction circuits |
Families Citing this family (11)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JP4387738B2 (ja) * | 2003-09-18 | 2009-12-24 | 富士重工業株式会社 | 電荷信号変換アンプ |
DE102004048330B4 (de) * | 2004-10-05 | 2014-10-16 | Volkswagen Ag | Verfahren zur Diagnose für eine Motorsteuerung und entsprechende Motorsteuerung |
US8375777B2 (en) * | 2008-11-21 | 2013-02-19 | Bg Soflex Llc | Manifold pressure determination device |
US8706383B2 (en) * | 2010-02-15 | 2014-04-22 | GM Global Technology Operations LLC | Distributed fuel delivery system for alternative gaseous fuel applications |
US8364385B2 (en) * | 2010-03-30 | 2013-01-29 | GM Global Technology Operations LLC | Cylinder pressure sensor reset systems and methods |
JP5413422B2 (ja) * | 2011-08-11 | 2014-02-12 | 株式会社デンソー | 内燃機関の筒内圧検出装置 |
DE102012207291A1 (de) | 2012-05-02 | 2013-11-07 | Robert Bosch Gmbh | Verfahren zur Bestimmung eines Offsets eines Ausgangssignales einer, in einem Sensor integrierten Auswerteschaltung, vorzugsweise eines in einem Brennraum einer Brennkraftmaschine verbauten Drucksensors und ein Sensor |
US9279406B2 (en) | 2012-06-22 | 2016-03-08 | Illinois Tool Works, Inc. | System and method for analyzing carbon build up in an engine |
CN103234693A (zh) * | 2013-04-02 | 2013-08-07 | 深圳市元征科技股份有限公司 | 一种数字缸压检测装置及方法 |
US10012155B2 (en) | 2015-04-14 | 2018-07-03 | Woodward, Inc. | Combustion pressure feedback based engine control with variable resolution sampling windows |
US10934965B2 (en) | 2019-04-05 | 2021-03-02 | Woodward, Inc. | Auto-ignition control in a combustion engine |
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JPS6344133U (ja) * | 1986-09-08 | 1988-03-24 | ||
JPS6398535A (ja) * | 1986-10-15 | 1988-04-30 | Nippon Denso Co Ltd | 気筒内圧力センサの入力処理回路 |
JPH03246352A (ja) * | 1990-02-23 | 1991-11-01 | Nissan Motor Co Ltd | 内燃機関の燃焼状態検出装置 |
JPH07280686A (ja) * | 1994-04-07 | 1995-10-27 | Unisia Jecs Corp | 内燃機関の筒内圧検出装置 |
JP2000045857A (ja) * | 1998-07-29 | 2000-02-15 | Honda Motor Co Ltd | エンジンの筒内圧検出装置 |
Family Cites Families (12)
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AT377132B (de) * | 1982-08-26 | 1985-02-11 | List Hans | Ladungsverstaerkerschaltung |
JPH0681944B2 (ja) * | 1985-10-17 | 1994-10-19 | 日産自動車株式会社 | 内燃機関の制御装置 |
US4821194A (en) * | 1985-10-22 | 1989-04-11 | Nissan Motor Company, Limited | Cylinder combustion monitoring apparatus |
JP2830305B2 (ja) | 1990-02-21 | 1998-12-02 | 日産自動車株式会社 | 内燃機関の燃焼状態検出装置 |
JPH03246327A (ja) | 1990-02-23 | 1991-11-01 | Nissan Motor Co Ltd | 内燃機関の失火検出装置 |
US5076098A (en) | 1990-02-21 | 1991-12-31 | Nissan Motor Company, Limited | System for detecting combustion state in internal combustion engine |
DE19506133B4 (de) * | 1994-03-04 | 2004-05-27 | Volkswagen Ag | Vorrichtung zur Erfassung des Brennrauminnendruckes mindestens eines Zylinders einer Verbrennungskraftmaschine |
CH693074A5 (de) * | 1998-05-19 | 2003-02-14 | Kk Holding Ag | Schaltungsanordnung zur Messung piezoelektrischer Signale. |
JP2002332908A (ja) * | 2001-05-02 | 2002-11-22 | Ngk Spark Plug Co Ltd | 内燃機関の失火検出方法及び失火検出システム |
JP4309158B2 (ja) * | 2003-03-19 | 2009-08-05 | 富士重工業株式会社 | 電荷信号変換アンプ、及び筒内圧測定装置 |
JP4334959B2 (ja) * | 2003-09-19 | 2009-09-30 | 富士重工業株式会社 | 多気筒エンジンの燃焼圧データ収集システム |
CA2622016A1 (en) | 2005-09-09 | 2007-03-15 | Imperial Innovations Limited | Interferon lambda therapy for treatment of respiratory diseases |
-
2003
- 2003-04-21 JP JP2003116073A patent/JP4094475B2/ja not_active Expired - Fee Related
-
2004
- 2004-04-21 EP EP04728652A patent/EP1632669A4/en not_active Withdrawn
- 2004-04-21 WO PCT/JP2004/005685 patent/WO2004094807A1/ja active Application Filing
-
2005
- 2005-10-11 US US11/249,110 patent/US7062955B2/en not_active Expired - Fee Related
Patent Citations (5)
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JPS6344133U (ja) * | 1986-09-08 | 1988-03-24 | ||
JPS6398535A (ja) * | 1986-10-15 | 1988-04-30 | Nippon Denso Co Ltd | 気筒内圧力センサの入力処理回路 |
JPH03246352A (ja) * | 1990-02-23 | 1991-11-01 | Nissan Motor Co Ltd | 内燃機関の燃焼状態検出装置 |
JPH07280686A (ja) * | 1994-04-07 | 1995-10-27 | Unisia Jecs Corp | 内燃機関の筒内圧検出装置 |
JP2000045857A (ja) * | 1998-07-29 | 2000-02-15 | Honda Motor Co Ltd | エンジンの筒内圧検出装置 |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1519176A1 (en) * | 2003-09-19 | 2005-03-30 | Fuji Jukogyo Kabushiki Kaisha | Combustion pressure data collection system with multi-cylinder engine with charge amplifiers with correction circuits |
Also Published As
Publication number | Publication date |
---|---|
JP4094475B2 (ja) | 2008-06-04 |
JP2004324429A (ja) | 2004-11-18 |
EP1632669A1 (en) | 2006-03-08 |
EP1632669A4 (en) | 2009-02-25 |
US20060032291A1 (en) | 2006-02-16 |
US7062955B2 (en) | 2006-06-20 |
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