EP0625635B1 - Electronic system for computing injection time - Google Patents
Electronic system for computing injection time Download PDFInfo
- Publication number
- EP0625635B1 EP0625635B1 EP94107599A EP94107599A EP0625635B1 EP 0625635 B1 EP0625635 B1 EP 0625635B1 EP 94107599 A EP94107599 A EP 94107599A EP 94107599 A EP94107599 A EP 94107599A EP 0625635 B1 EP0625635 B1 EP 0625635B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- injection time
- value
- computing
- computed
- characteristic
- 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 - Lifetime
Links
- 238000002347 injection Methods 0.000 title claims description 42
- 239000007924 injection Substances 0.000 title claims description 42
- 239000000446 fuel Substances 0.000 claims description 11
- 238000002485 combustion reaction Methods 0.000 claims description 8
- 238000000034 method Methods 0.000 claims description 3
- 239000000203 mixture Substances 0.000 claims description 2
- 230000015654 memory Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000001276 controlling effect Effects 0.000 description 2
- 230000006870 function Effects 0.000 description 2
- 230000001052 transient effect Effects 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 239000000498 cooling water Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B1/00—Engines characterised by fuel-air mixture compression
- F02B1/02—Engines characterised by fuel-air mixture compression with positive ignition
- F02B1/04—Engines characterised by fuel-air mixture compression with positive ignition with fuel-air mixture admission into cylinder
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02D—CONTROLLING COMBUSTION ENGINES
- F02D2250/00—Engine control related to specific problems or objectives
- F02D2250/12—Timing of calculation, i.e. specific timing aspects when calculation or updating of engine parameter is performed
Definitions
- the present invention relates to an electronic system for computing the fuel injection time of an internal combustion engine.
- Electronic systems for computing injection time are known wherein an electronic microprocessor system is supplied with a number of signals relative to parameters typical of an internal combustion engine (e.g. air intake and/or pressure, position of the throttle valve in the air intake manifold, air intake temperature, engine cooling water temperature, battery voltage, etc..), and processes the signals to generate an output signal controlling the fuel injection system.
- parameters typical of an internal combustion engine e.g. air intake and/or pressure, position of the throttle valve in the air intake manifold, air intake temperature, engine cooling water temperature, battery voltage, etc..
- Processing of the information signals may be accelerated using faster microprocessors, but only at the expense of increasing the total cost of the computing system.
- Number 1 in Figure 1 indicates an electronic injection time computing system in which an electronic control system 3 is connected to the injection control device 5 of a fuel injection system 7 (shown schematically) of an internal combustion engine, in particular a vehicle petrol engine (not shown).
- Electronic control system 3 comprises an analog-digital interface 13; a central microprocessor unit 15; and an actuating interface 17 output-connected by a number of control lines 20 to injection control device 5.
- Analog-digital interface 13 presents a number of inputs 22a-22n connected by respective lines 24a-24n to sensors 26a-26n in the engine.
- sensors 26a-26n comprise, for example, a sensor for detecting air intake temperature; a sensor for detecting the water temperature of the engine cooling system (not shown); a sensor for detecting the stoichiometric composition of the exhaust gas; two sensors for detecting the position of mechanical members (not shown) on the engine (engine speed and stroke); a sensor for detecting the voltage of the vehicle battery (not shown); a sensor for detecting the position of the throttle valve (not shown) in the intake manifold; an intake air supply sensor; a sensor for detecting the absolute pressure in the intake manifold; and a sensor for detecting the pressure inside the combustion chamber.
- Analog-digital interface 13 presents an input 28 connected by a respective line 29 to a sensor 30 for generating an output signal correlated to an engine parameter which, as explained later on, may be said to be highly significant, and indeed the most significant of the parameters detected by sensors 26a-26n, for injection time computing purposes.
- Sensor 30 may conveniently be formed by the sensor for detecting air supply to the engine, the position of the throttle valve in the intake manifold, intake air pressure, the pressure inside the combustion chamber, or any other parameter of potential interest.
- Interface 13 also presents a number of outputs 32a-32n at which are present the respective digital values X1,...XN of the signals produced by sensors 26a-26n; and an output 36 at which is present the digital value Qt of the signal produced by sensor 30.
- Outputs 32a-32n are connected to processing unit 15 by respective lines 34a-34n, and output 36 by line 37 to the input 40e of a selecting device 40.
- Processing unit 15 comprises a first computing circuit 42 having a first input 43 connected by line 45 to a first output 40a of selecting device 40, and further inputs 42a-42n connected respectively to lines 34a-34n.
- Unit 15 also comprises a computing circuit 50 having two inputs 51, 52 connected to lines 45, 48, and an output 54 connected to a second computing circuit 56.
- computing circuit 50 At output 54, computing circuit 50 generates a signal which is the quotient of the signals at inputs 52 and 51.
- the second computing circuit 56 presents an input 58 connected to a second output 40b of device 40, and an output 60 connected by line 62 to a second input of interface 17, and generates an output signal which is the product of the signal at input 58 and the signal on line 54.
- Block 90 then goes on to block 110 controlling selecting device 40. More specifically, in the event the content of counter J equals M, input 40e of device 40 is connected to output 40a, and block 110 goes on to block 101. Conversely, input 40e of device 40 is connected to output 40b, and block 110 goes on to block 130.
- Block 101 provides, by means of interface 13, for analog-digital conversion of the signals generated by sensors 26a-26n and sensor 30, and for storing the values X1,...XN and Qt of the signals in memory 13a ( Figure 1).
- Block 101 then goes on to block 120, which provides for reading in memory 13a the value Qt of the signal generated by sensor 30.
- Block 150 is followed by block 155 which resets the content of counter J, and then goes on to block 160 where the injection time T computed in block 140 is transferred to actuating interface 17, which provides for opening the injectors (not shown) according to the computed value T. At this point, block 160 goes back to block 110.
- Block 170 provides, by means of interface 13, for analog-digital conversion of the signal generated by sensor 30, and for storing the value Qt+1 of the signal in memory 13a.
- Block 180 then goes on to block 160 where, via line 62, the value Tn computed in block 180 is transferred to actuating interface 17 which provides for opening the injectors (not shown) according to the computed value Tn.
- injection time is initially computed exactly (and fairly slowly) in block 140 by means of circuit 42, and is subsequently approximated (at a faster rate) M consecutive times by circuit 56.
- the overall speed of system 1 is greater than that of known systems.
- System 1 is therefore also capable of "following" even rapid transient operating states of the engine; all of which advantages are achieved with no need for more complex microprocessors, or for increasing the capacity of the memories interacting with the microprocessor.
- System 1 is also easily implementable, even on not particularly high-capacity microprocessors, by virtue of employing straightforward algebraic operations (division and multiplication).
- the parameter detected by sensor 30 and considered significant for injection time computation purposes may be other than those described by way of example, depending on the type of parameters detected by the sensors as a whole, and the type of performance demanded of the engine.
- the number of sensors may be other than as indicated.
- a subset of engine parameters may be employed as significant parameters for computing approximate injection time.
Landscapes
- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
Description
- The present invention relates to an electronic system for computing the fuel injection time of an internal combustion engine.
- Electronic systems for computing injection time are known wherein an electronic microprocessor system is supplied with a number of signals relative to parameters typical of an internal combustion engine (e.g. air intake and/or pressure, position of the throttle valve in the air intake manifold, air intake temperature, engine cooling water temperature, battery voltage, etc..), and processes the signals to generate an output signal controlling the fuel injection system.
- Known computing systems take some time (normally in the order of a few tens of milliseconds) to process all the incoming information signals, so that, during transient operating states of the engine (e.g. sharp acceleration), they fail to respond promptly to rapid variations in the input signals, thus resulting in an inadequate output control signal.
- Processing of the information signals may be accelerated using faster microprocessors, but only at the expense of increasing the total cost of the computing system.
- It is an object of the present invention to provide a low-cost electronic computing system designed to enable high-speed processing.
- According to the present invention, there is provided an electronic system computing the fuel injection time of an internal combustion engine, and applying in use the computed fuel injection time supplied to an output of the electronic system to a fuel injection control apparatus, comprising first computing means supplied with a number of information signals (X1,...XN,Qt) measured in said engine; said first computing means generating at the output a fuel injection time (T) computed on the basis of a characteristic (T=F(X1,...XN,Qt)) depending on said information signals at a first rate; characterized by the fact that it also comprises: means for processing an expansion of said characteristic (T=F(X1,...XN,Qt)), which expansion is computed, as a function of a previously computed injection time (T) and of a first value (Qt) of at least one significant information signal used for computing said injection time, about said first value (Qt) of said significant signal; second computing means supplied with said expansion of said characteristic (T=F(X1,...XN,Qt)) and with a second value (Qt+1) of said significant signal; said second computing means generating at the output an approximate injection time (Tn) computed as a function of the expansion of said characteristic (T=F(X1,...XN,Qt)) and of said second value (Qt+1) of said significant signal at a second rate higher than the first rate.
- A preferred, non-limiting embodiment of the present invention will be described by way of example with reference to the accompanying drawings, in which:
- Figure 1 shows a circuit block diagram of an electronic injection system in accordance with the teachings of the present invention;
- Figure 2 shows a logic block diagram of the operations performed by the Figure 1 system.
-
Number 1 in Figure 1 indicates an electronic injection time computing system in which an electronic control system 3 is connected to the injection control device 5 of a fuel injection system 7 (shown schematically) of an internal combustion engine, in particular a vehicle petrol engine (not shown). Electronic control system 3 comprises an analog-digital interface 13; acentral microprocessor unit 15; and anactuating interface 17 output-connected by a number ofcontrol lines 20 to injection control device 5. Analog-digital interface 13 presents a number of inputs 22a-22n connected byrespective lines 24a-24n tosensors 26a-26n in the engine. More specifically,sensors 26a-26n comprise, for example, a sensor for detecting air intake temperature; a sensor for detecting the water temperature of the engine cooling system (not shown); a sensor for detecting the stoichiometric composition of the exhaust gas; two sensors for detecting the position of mechanical members (not shown) on the engine (engine speed and stroke); a sensor for detecting the voltage of the vehicle battery (not shown); a sensor for detecting the position of the throttle valve (not shown) in the intake manifold; an intake air supply sensor; a sensor for detecting the absolute pressure in the intake manifold; and a sensor for detecting the pressure inside the combustion chamber. - Analog-
digital interface 13 presents aninput 28 connected by arespective line 29 to asensor 30 for generating an output signal correlated to an engine parameter which, as explained later on, may be said to be highly significant, and indeed the most significant of the parameters detected bysensors 26a-26n, for injection time computing purposes.Sensor 30 may conveniently be formed by the sensor for detecting air supply to the engine, the position of the throttle valve in the intake manifold, intake air pressure, the pressure inside the combustion chamber, or any other parameter of potential interest.Interface 13 also presents a number of outputs 32a-32n at which are present the respective digital values X1,...XN of the signals produced bysensors 26a-26n; and anoutput 36 at which is present the digital value Qt of the signal produced bysensor 30. Outputs 32a-32n are connected toprocessing unit 15 byrespective lines 34a-34n, andoutput 36 byline 37 to theinput 40e of aselecting device 40. -
Processing unit 15 comprises afirst computing circuit 42 having afirst input 43 connected byline 45 to a first output 40a of selectingdevice 40, andfurther inputs 42a-42n connected respectively tolines 34a-34n.Circuit 42 also presents anoutput 47 connected by line 48 to a first input ofactuating interface 17, and comprises a number of algebraic computing circuits (not shown) for producing a characteristic T=F(X1,...XN,Qt) which, for the set of values X1,...XN,Qt of the signals supplied to the input ofcircuit 42, gives an output variable T representing an injection time.Unit 15 also comprises acomputing circuit 50 having twoinputs lines 45, 48, and anoutput 54 connected to asecond computing circuit 56. - At
output 54,computing circuit 50 generates a signal which is the quotient of the signals atinputs second computing circuit 56 presents an input 58 connected to asecond output 40b ofdevice 40, and anoutput 60 connected byline 62 to a second input ofinterface 17, and generates an output signal which is the product of the signal at input 58 and the signal online 54. - Operation of
system 1 will now be described with reference to the Figure 2 block diagram showing the sequence of operations performed by electronic control system 3. -
-
Block 90 then goes on to block 110 controlling selectingdevice 40. More specifically, in the event the content of counter J equals M,input 40e ofdevice 40 is connected to output 40a, andblock 110 goes on toblock 101. Conversely,input 40e ofdevice 40 is connected tooutput 40b, andblock 110 goes on to block 130.Block 101 provides, by means ofinterface 13, for analog-digital conversion of the signals generated bysensors 26a-26n andsensor 30, and for storing the values X1,...XN and Qt of the signals in memory 13a (Figure 1).Block 101 then goes on toblock 120, which provides for reading in memory 13a the value Qt of the signal generated bysensor 30.Block 120 is followed byblock 140 which provides for computing an injection time T on the basis of values X1,...XN and Qt of all the signals supplied tocircuit 42. More specifically, time T is computed (in known manner) by means of characteristic T=F(X1,...XN,Qt) ofcircuit 42. -
Block 140 is followed byblock 150 which provides for generating a coefficient K; which coefficient K is generated bycircuit 50 on the basis of the signals supplied toinputs circuit 42 and the value Qt read byblock 120, according to the equation: -
Block 150 is followed byblock 155 which resets the content of counter J, and then goes on to block 160 where the injection time T computed inblock 140 is transferred to actuatinginterface 17, which provides for opening the injectors (not shown) according to the computed value T. At this point,block 160 goes back toblock 110.Block 130 increases the content of the counter by one unit according to operation J=J+1 , and is followed byblock 170 in which is detected asensor 30 signal value Qt+1 subsequent to value Qt formerly used for computing injectiontime T. Block 170 provides, by means ofinterface 13, for analog-digital conversion of the signal generated bysensor 30, and for storing the value Qt+1 of the signal in memory 13a. -
- The approximate injection time supplied by
circuit 56 is a linearization of the characteristic T=F(X1,...XN,Qt) about value Qt assumed by the variable at the last complete recomputation byblock 140, taking as a constant the contribution to the variation produced by the other variables X1,...XN. This is effected by means of an expansion (to the first term) of characteristic T=F(X1,...XN,Qt) according to the following type of equation: -
-
Block 180 then goes on to block 160 where, vialine 62, the value Tn computed inblock 180 is transferred to actuatinginterface 17 which provides for opening the injectors (not shown) according to the computed value Tn. - The calculation in
block 140, therefore, is effected relatively slowly by means of characteristic T=F(X1,...XN, Qt), whereas that ofcircuit 56 is extremely fast by virtue of being reduced to a single algebraic multiplication of coefficient K and value Qt+1 of the signal generated bysensor 30. - As such, injection time is initially computed exactly (and fairly slowly) in
block 140 by means ofcircuit 42, and is subsequently approximated (at a faster rate) M consecutive times bycircuit 56. - For a given microprocessor, therefore, the overall speed of
system 1 is greater than that of known systems. -
System 1 is therefore also capable of "following" even rapid transient operating states of the engine; all of which advantages are achieved with no need for more complex microprocessors, or for increasing the capacity of the memories interacting with the microprocessor. -
System 1 is also easily implementable, even on not particularly high-capacity microprocessors, by virtue of employing straightforward algebraic operations (division and multiplication). - To those skilled in the art it will be clear that changes may be made to the system as described and illustrated herein without, however, departing from the scope of the present invention.
- In particular, the parameter detected by
sensor 30 and considered significant for injection time computation purposes may be other than those described by way of example, depending on the type of parameters detected by the sensors as a whole, and the type of performance demanded of the engine. Moreover, as shown by the dotted line in Figure 1, the number of sensors may be other than as indicated. Finally, instead of a single parameter, a subset of engine parameters may be employed as significant parameters for computing approximate injection time.
Claims (7)
- An electronic system computing the fuel injection time of an internal combustion engine, and applying in use the computed fuel injection time supplied to an output of the electronic system to a fuel injection control apparatus, comprising first computing means (42, 140) supplied with a number of information signals (X1,...XN,Qt) measured in said engine; said first computing means (42, 140) generating at the output a fuel injection time (T) computed on the basis of a characteristic (T=F(X1,...XN,Qt)) depending on said information signals at a first rate; characterized by the fact that it also comprises: means (50, 56, 150, 180) for processing an expansion of said characteristic (T=F(X1,...XN,Qt)), which expansion is computed, as a function of a previously computed injection time (T) and of a first value (Qt) of at least one significant information signal used for computing said injection time, about said first value (Qt) of said significant signal; second computing means (56, 180) supplied with said expansion of said characteristic (T=F(X1,...XN,Qt)) and with a second value (Qt+1) of said significant signal; said second computing means (56, 180) generating at the output an approximate injection time (Tn) computed as a function of the expansion of said characteristic (T=F(X1,...XN,Qt)) and of said second value (Qt+1) of said significant signal at a second rate higher than the first rate.
- A system as claimed in Claim 1, characterized by the fact that said processing means comprise means (50, 56, 150, 180) for linearizing said characteristic (T=F(X1,...XN,Qt)) about said first value (Qt) of said significant signal.
- A system as claimed in Claim 2, characterized by the fact that said means (50, 56, 150, 180) for linearizing said characteristic (T=F(X1,...XN,Qt)) process a coefficient (K) computed as a function of a previously computed injection time (T) and of said first value (Qt) of said significant information signal; said second computing means being supplied with said coefficient (K) and with said second value (Qt+1) of said significant signal; and said second computing means generating at the output an approximate injection time (Tn) computed as a function of said coefficient (K) and of said second value (Qt+1) of said significant signal.
- A system as claimed in Claim 3, characterized by the fact that said processing means (50, 150) produce said coefficient (K) as the ratio between said injection time (T) and said first value (Qt) of said significant signal used for computing said injection time (T).
- A system as claimed in Claim 3, characterized by the fact that said second computing means (56, 180) generate said approximate injection time (Tn) as the product of said coefficient (K) and said second value (Qt+1) of said significant signal.
- A system as claimed in any one of the foregoing Claims, characterized by the fact that it comprises selecting means (40, 110) for selecting said first computing means (42, 140) or said second computing means (56, 180) for supplying injection actuating means (160) with said injection time (T) computed by said first means or with said approximate injection time (Tn).
- A system as claimed in any one of the foregoing Claims, characterized by the fact that said significant signal is relative to at least one parameter selectable from among the stoichiometric composition of the exhaust gas, engine speed, the pressure inside the combustion chamber, battery voltage, the position of the throttle valve in the intake manifold, air intake, and the absolute pressure in the intake manifold.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT93BO000213A IT1266351B1 (en) | 1993-05-17 | 1993-05-17 | ELECTRONIC INJECTION TIME CALCULATION SYSTEM. |
ITBO930213 | 1993-05-17 |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0625635A1 EP0625635A1 (en) | 1994-11-23 |
EP0625635B1 true EP0625635B1 (en) | 1997-08-06 |
Family
ID=11339032
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP94107599A Expired - Lifetime EP0625635B1 (en) | 1993-05-17 | 1994-05-16 | Electronic system for computing injection time |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0625635B1 (en) |
DE (1) | DE69404750T2 (en) |
ES (1) | ES2106406T3 (en) |
IT (1) | IT1266351B1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10226903A1 (en) * | 2002-06-17 | 2004-01-15 | Siemens Ag | Operating method for a computing unit |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS59221435A (en) * | 1983-05-31 | 1984-12-13 | Hitachi Ltd | Control method for fuel injection |
IT1187872B (en) * | 1986-01-24 | 1987-12-23 | Weber Spa | QUICK CORRECTION SYSTEM OF THE TITLE OF THE COMBUSTIBLE MIXTURE PROVIDED TO AN ENDOTHERMAL ENGINE INCLUDING AN INJECTION SYSTEM AND ELECTRONICS |
JPH071463B2 (en) * | 1986-06-30 | 1995-01-11 | フアナツク株式会社 | Robot controller |
JPS63116983A (en) * | 1986-11-05 | 1988-05-21 | Nissan Motor Co Ltd | Vehicle kinetic state estimating parameter corrective device |
AU602390B2 (en) * | 1987-02-13 | 1990-10-11 | Mitsubishi Denki Kabushiki Kaisha | Method for controlling the operation of an engine for a vehicle |
-
1993
- 1993-05-17 IT IT93BO000213A patent/IT1266351B1/en active IP Right Grant
-
1994
- 1994-05-16 ES ES94107599T patent/ES2106406T3/en not_active Expired - Lifetime
- 1994-05-16 DE DE69404750T patent/DE69404750T2/en not_active Expired - Fee Related
- 1994-05-16 EP EP94107599A patent/EP0625635B1/en not_active Expired - Lifetime
Also Published As
Publication number | Publication date |
---|---|
ITBO930213A1 (en) | 1994-11-17 |
EP0625635A1 (en) | 1994-11-23 |
IT1266351B1 (en) | 1996-12-27 |
ITBO930213A0 (en) | 1993-05-17 |
DE69404750D1 (en) | 1997-09-11 |
DE69404750T2 (en) | 1997-12-11 |
ES2106406T3 (en) | 1997-11-01 |
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