GB2387948A - Methods of protecting an internal combustion engine - Google Patents

Methods of protecting an internal combustion engine Download PDF

Info

Publication number
GB2387948A
GB2387948A GB0306471A GB0306471A GB2387948A GB 2387948 A GB2387948 A GB 2387948A GB 0306471 A GB0306471 A GB 0306471A GB 0306471 A GB0306471 A GB 0306471A GB 2387948 A GB2387948 A GB 2387948A
Authority
GB
United Kingdom
Prior art keywords
combustion engine
internal combustion
rotational speed
switched
measured
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.)
Granted
Application number
GB0306471A
Other versions
GB0306471D0 (en
GB2387948B (en
Inventor
Winfried Langer
Martin Haussmann
Andreas Roth
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Robert Bosch GmbH
Original Assignee
Robert Bosch GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Robert Bosch GmbH filed Critical Robert Bosch GmbH
Publication of GB0306471D0 publication Critical patent/GB0306471D0/en
Publication of GB2387948A publication Critical patent/GB2387948A/en
Application granted granted Critical
Publication of GB2387948B publication Critical patent/GB2387948B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
    • F02M65/00—Testing fuel-injection apparatus, e.g. testing injection timing ; Cleaning of fuel-injection apparatus
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1497—With detection of the mechanical response of the engine
    • F02D41/1498—With detection of the mechanical response of the engine measuring engine roughness
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D41/221—Safety or indicating devices for abnormal conditions relating to the failure of actuators or electrically driven elements
    • 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
    • F02D41/22—Safety or indicating devices for abnormal conditions
    • F02D2041/224—Diagnosis of the fuel system
    • F02D2041/225—Leakage detection
    • 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
    • F02D2200/08—Exhaust gas treatment apparatus parameters
    • F02D2200/0802—Temperature of the exhaust gas treatment apparatus
    • 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
    • F02D2200/1012—Engine speed gradient
    • 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
    • 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
    • F02D41/008—Controlling each cylinder individually
    • F02D41/0087—Selective cylinder activation, i.e. partial cylinder operation
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/04—Introducing corrections for particular operating conditions
    • F02D41/042—Introducing corrections for particular operating conditions for stopping the engine
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1446—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being exhaust temperatures
    • 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
    • F02D41/02—Circuit arrangements for generating control signals
    • F02D41/14—Introducing closed-loop corrections
    • F02D41/1438—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor
    • F02D41/1444—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases
    • F02D41/1454—Introducing closed-loop corrections using means for determining characteristics of the combustion gases; Sensors therefor characterised by the characteristics of the combustion gases the characteristics being an oxygen content or concentration or the air-fuel ratio
    • 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
    • F02D41/30—Controlling fuel injection
    • F02D41/38—Controlling fuel injection of the high pressure type

Landscapes

  • Engineering & Computer Science (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)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Exhaust Gas After Treatment (AREA)
  • Electrical Control Of Ignition Timing (AREA)
  • Control Of Throttle Valves Provided In The Intake System Or In The Exhaust System (AREA)

Abstract

An internal combustion engine is protected from petrol shock, or a catalytic converter is protected from over-heating if cylinder combustion misses occur. In one method, an actual value derived from airflow out of the IC engine and fuel injection amount is compared with a setpoint value and the engine is switched off if a preset difference is exceeded. In another method, the engine is switched off if the exhaust temperature is too high. In a third method, the rotational speed of the engine is measured after the ignition is turned off, and in a fourth method increased and decreased torque are detected.

Description

Methods of protecting an internal combustion engine De script ion 10 The
invention concerns methods of protecting an internal combustion engine from petrol shock, or protecting a catalytic converter of the internal combustion engine from over-heating, according to the attached Claims 1, 2, 6 and
13. Prior art
Many different methods by which combustion misses can be 20 detected are known. The aim of all these methods is to interrupt the fuel feed to the cylinder which is affected by combustion misses. However, if a highpressure injection valve sticks in the opened state, this high-pressure injection valve cannot be closed by an appropriate control 25 signal. Consequently, a very large quantity of fuel goes into the affected cylinder, and this can damage the catalytic converter, if combustion of this unburned fuel takes place in the catalytic converter. The resulting temperature increase in the catalytic converter can destroy 30 it, and in particularly extreme cases even set fire to the vehicle. Additionally, such a large quantity of fuel can be injected into the cylinders by the high-pressure injection
l valve which is stuck open that the combustion chamber of this cylinder is almost completely filled with fuel when the piston moves from BDC to TDC. This results in blocking the piston, and consequently breaking the connecting rod, 5 and other serious damage to the engine. In relation to the invention, this blocking of the piston is called "petrol shock". For quite a long time, therefore, there has been the 10 problem of creating a method of protecting an internal combustion engine from petrol shock in the case of combustion misses in an internal combustion engine, and protecting the catalytic converter, without requiring any special additional design actions, and effectively 15 protecting the internal combustion engine and catalytic converter from damage.
Presentation of the invention A method according to the invention of protecting an internal combustion engine from petrol shock, or protecting a catalytic converter of the internal combustion engine from over-heating, is characterized in that whether 25 combustion misses occur in a cylinder is determined by a method, which is known per se, of cylinder- selective combustion miss detection, to interrupt the fuel feed to the affected cylinder, that from the air mass which is sucked out of the internal combustion engine and the 30 quantity of fuel which is injected into the internal combustion engine a setpoint value ASetpoint is formed, that the setpoint value A5etpoint is compared with an actual value AaCtual which is measured in the exhaust system of the
internal combustion engine, and that the internal combustion engine is switched off, or a warning signal is generated, if the setpoint value Asetpoint is greater than the measured actual value AaCtual by a specified amount LA. With 5 this method, by evaluation according to the invention of magnitudes which are present in any case, a sticking high-
pressure injection valve can be detected, and in this case the internal combustion engine can be switched off, so that no consequential damage occurs.
Another method according to the invention of protecting an internal combustion engine from petrol shock, or protecting a catalytic converter of the internal combustion engine from over-heating, is characterized in that whether 15 combustion misses occur in a cylinder is determined by a method, which is known per se, of cylinder-selective combustion miss detection, to interrupt the fuel feed to the affected cylinder, that the exhaust gas temperature of the internal combustion engine is measured, and that if an 20 impermissible high exhaust gas temperature occurs, the internal combustion engine is switched off.
These actions ensure that the fuel quantities which go into the catalytic converter are not so large that they can 25 result in destruction of the catalytic converter by over-
heating in the case of a reaction with the oxygen which is present in the exhaust gas. With this method according to the invention too, no additional sensors or other devices are required. Additionally, these actions effectively 30 prevent such a large quantity of fuel collecting in the affected cylinder that it can result in the petrol shock described above, because before the petrol shock occurs the
exhaust gas temperature rises significantly and/or combustion misses occur.
According to an advantageous further development of the 5 method according to the invention, it is provided that the measured exhaust gas temperature is compared with an exhaust gas temperature model, and that the internal combustion engine is switched off if the measured exhaust gas temperature is above the exhaust gas temperature which 10 is determined by the exhaust gas temperature model by a temperature difference At, so that depending on the operating state of the internal combustion engine, on the one hand an impermissible high exhaust gas temperature is reliably detected, and on the other hand the internal 15 combustion engine is switched off only if this is unavoidable to protect the internal combustion engine or catalytic converter.
The method according to the invention can be used specially 20 advantageously with internal combustion engines with direct petrol injection and internal combustion engines with inlet pipe injection which meet the future US SULEV exhaust gas standard, since with both internal combustion engines at least an exhaust gas temperature sensor, and in general an 25 exhaust gas temperature model, are present. In these cases, the method according to the invention can be used without additional hardware costs.
In another method according to the invention of protecting 30 an internal combustion engine from petrol shock, or protecting a catalytic converter of the internal combustion engine from over-heating, in which when the internal combustion engine is switched off using the ignition lock
the high-pressure injection valves are also switched off, while the ignition remains switched on, the rotational speed of the internal combustion engine is measured after a specified number of revolutions, the measured rotational 5 speed is compared with a reference rotational speed, and a leaking high-pressure injection valve is diagnosed if the measured rotational speed is greater than the reference rotational speed. To detect a sticking high-pressure injection valve irrespective of the output rotational speed 10 of the internal combustion engine when the high-pressure injection valves are switched off, the method can also be carried out by comparing rotational speed gradients.
This method assumes exhaust-gas-optimised switching off of 15 the internal combustion engine, which is known in itself.
For this purpose, when the ignition key is removed from the ignition lock, as with any vehicle, terminal 15 is de-
energised. Via terminal 15, the high-pressure injection valves are also de-energised, simultaneously with the 20 removal of the ignition key from the ignition lock. The ignition remains activated for a time, e.g. for a specified number of revolutions of the internal combustion engine or a specified duration. This means that even fuel which has gone into the combustion chambers after the internal 25 combustion engine is switched off is burned. If the internal combustion engine functions properly, the rotational speed of the internal combustion engine falls in a specified way. If a high-pressure injection valve is fully or partly open, an undesired quantity of fuel goes 30 into the associated combustion chamber via this high-
pressure injection valve and is ignited by the ignition, so that the rotational speed of the internal combustion engine falls more slowly than with proper functioning of all high
pressure injection valves. Thus by comparing the measured rotational speed with a reference rotational speed, a leaking high-pressure injection valve can be diagnosed without additional cost.
In a further extension of the invention, the high-pressure injection valve can be determined from the course of the rotational speed of the internal combustion engine, since whenever the cylinder which is assigned to the leaking 10 high-pressure injection valve is in the power stroke, the rotational speed of the internal combustion engine rises.
Further forms of the invention provide that a signal which indicates the presence of a leaking high-pressure injection 15 valve and/or the leaking high-pressure injection valve is output to a fault memory, so that the next time the vehicle is in the workshop, fast, reliable fault diagnosis is possible. 20 According to the invention, it can also be provided that after a specified number of revolutions of the internal combustion engine, the ignition is switched off.
Alternatively, immediately after detection of a leaking 25 high-pressure injection valve, the ignition can be switched off, and/or a throttle valve in the suction section can be fully opened, to minimise the danger of damage to the internal combustion engine.
30 In a further alternative form of the method according to the invention of protecting an internal combustion engine from petrol shock, or protecting a catalytic converter of the internal combustion engine from over-heating, a method
of improving smooth running by individual control of the cylinders determines whether one of the cylinders gives an increased or decreased torque compared with the setpoint torque, and switches the internal combustion engine off if 5 a decreased torque is detected following an increased torque. If a first increased and then decreased torque is detected, there is a high probability that a high-pressure injection valve is first partly stuck open and then stuck in the almost fully open state. This state is particularly 10 dangerous for an internal combustion engine, because the so-called petrol shock can result. The internal combustion engine is therefore switched off immediately after the occurrence of the reduced torque.
15 A further form of this method according to the invention provides that when the internal combustion engine is operated for the first time, limiting values for control of smooth running of the internal combustion engine are determined, and in particular stored in a permanent RAM, so 20 that the divergences of mass production can be taken into account in the application of the method according to the invention. In a further extension of the invention, a warning signal 25 can also be output if one of the cylinders is apparently giving an increased torque.
So that a sticking high-pressure injection valve can be detected with further increased reliability, it can 30 alternatively be provided, additionally to the methods which are claimed in Claims 2 to 15, that from the air mass which is sucked out of the internal combustion engine and the quantity of fuel which is injected into the internal
combustion engine a setpoint value is formed, that the setpoint value is compared with an actual value which is measured in the exhaust system of the internal combustion engine, and that a redundant warning signal is generated if 5 the setpoint value is greater than the measured actual value by a specified amount. The redundant warning signal can be used together with the other error reports to switch the internal combustion engine off.
Drawings Fig. 1 shows a flowchart to explain a first method according to the invention, Fig. 2 shows a flowchart of a second embodiment of a method according to the invention, and Fig. 3 shows a flowchart of a third embodiment of a 20 method according to the invention.
Description of the embodiments
25 In the method which is shown in Fig. 1, after the start of the method, in a step S1 the signal from any traditional cylinder-selective miss detection system is polled. If a miss is detected, the high-pressure injection valve which belongs to this cylinder is switched off. If no miss is 30 detected, the method is ended.
For the case that a miss is detected, in a step S2 whether the exhaust gas temperature is too high is tested. This can
be done, for instance, by an exhaust gas temperature measurement. If the measured exhaust gas temperature exceeds a specified limit, which may also depend on the operating point, the engine is switched off. Alternatively, 5 a too high exhaust gas temperature can be determined by comparison of the measured exhaust gas temperature with exhaust gas temperature values which are determined by an exhaust gas temperature model. If a temperature difference Lt which occurs is greater than a specified maximum 10 temperature difference, the internal combustion engine is also switched off.
If the exhaust gas temperature is not too high, the internal combustion engine can continue to be operated, and 15 the vehicle can continue to move.
In Fig. 2, a flowchart of a second embodiment of a method according to the invention is shown. In a step S1O, when the ignition key is removed from the ignition lock, an after 20 running program is started. This consists of, among other things, the ignition remaining activated for a specified number Zabort of ignitions, whereas the high-pressure injection valves which are connected to terminal 15 of the ignition lock are no longer supplied with power.
Whether the number of ignitions which have occurred in the internal combustion engine since the ignition key was removed from the ignition lock is less than the abort threshold Zabort iS tested in a step S1l. If not, the ignition 30 is switched off, as shown in Step So.
If the number of ignitions after the internal combustion engine is switched off is less than Zabort, whether the
number of ignitions since the ignition key was removed is less than a specified number of revolutions Zquery iS tested.
This query occurs in Step S12. If the number of ignitions is less than Zquery, the program begins again before Step S1l.
5 Otherwise, whether the engine rotational speed is greater than or equal to a reference rotational speed nref is tested in Step S13. If so, at least one high-pressure injection valve is leaking, resulting in undesired power strokes in spite of de-energised high-pressure injection valves.
In the next step S14, the leaking valve is determined from the cylinder equalization and/or the smooth running control, in which the course of the rotational speed of the internal combustion engine is determined during one revolution. From the position of the crankshaft at the moment when its rotational speed increases, the cylinder which has a leaking high-pressure injection valve can be uniquely determined.
20 In a further Step S1s, the signal which identifies the leaking injection valve can be transmitted to a fault memory. To prevent damage to the internal combustion engine, in a Step S16, the ignition can be switched off immediately, and as indicated in a Step S17, the throttle 25 valve in the suction section can be opened. Steps S14, S15, S16 and S17 can be used either all together or in any combination with each other. At the latest when the number of ignitions after the ignition key is removed from the ignition lock is greater than Zabort' the ignition is 30 switched off (see S1) and the method has ended.
In Fig. 3, a further embodiment of a method according to the invention is shown. This method consists of two parts.
When the internal combustion engine is operated for the first time S20, limiting values for the cylinder equalization ZGSTmaX and ZGSTmin, which are necessary for control of smooth running of the internal combustion 5 engine, also called cylinder equalization, are determined.
These limiting values ZGSTmaX and ZGSTmin are determined in Step S21. Simultaneously, these limiting values are read into a memory, particularly a permanent RAM. By individual determination of limiting values when the internal 10 combustion engine is operated for the first time, mass production divergences can be taken into account.
At every subsequent start of the internal combustion engine, characterized in Fig. 3 by Step S22, whether the 15 measured cylinder equalization values (ZGST values), which are a measure of the smooth running of the internal combustion engine, overshoot or undershoot the stored maximum values ZGSTmax and ZGSTmin is tested. If there is no overshooting or undershooting, the internal combustion 20 engine is fault- free, and nothing else happens.
If the limits ZGSTmaX and ZGSTmin are overshot or undershot, a warning lamp is switched on, or the internal combustion engine is switched off, or both. These events are combined 25 in Step S24.

Claims (17)

  1. Claims 1. Method of protecting an internal combustion engine from petrol
    shock, or protecting a catalytic converter of the internal combustion engine from over-heating, in which whether combustion misses occur in a cylinder is determined 10 by a method of cylinder-selective combustion miss detection, to interrupt the fuel feed to the affected cylinder, characterized in that from the air mass which is sucked out of the internal combustion engine and the quantity of fuel which is injected into the internal 15 combustion engine a setpoint value (Asetpoint) is formed, that the setpoint value (Asetpoint) is compared with an actual value (AaCtual) which is measured in the exhaust system of the internal combustion engine, and that the internal combustion engine is switched off, or a warning signal is 20 generated, if the setpoint value (Asetpoint) is greater than the measured actual value (AaCtual) by a specified amount (HA).
  2. 2. Method of protecting an internal combustion engine from 25 petrol shock, or protecting a catalytic converter of the internal combustion engine from over-heating, in which whether combustion misses occur in a cylinder is determined by a method of cylinderselective combustion miss detection, to interrupt the fuel feed to the affected 30 cylinder, characterized in that the exhaust gas temperature is measured, and that if an impermissible high exhaust gas temperature occurs, the internal combustion engine is switched off.
  3. 3. Method according to Claim 2, characterized in that the measured exhaust gas temperature is compared with an exhaust gas temperature model, and that the internal 5 combustion engine is switched off if the measured exhaust gas temperature is above the exhaust gas temperature which is determined by the exhaust gas temperature model by a temperature difference Lt.
    10
  4. 4. Method according to one of Claims 1 to 3, characterized in that it is used in internal combustion engines with direct petrol injection.
  5. 5. Method according to one of Claims 1 to 3, characterized 15 in that it is used in internal combustion engines with inlet pipe injection.
  6. 6. Method of protecting an internal combustion engine from petrol shock, or protecting a catalytic converter of the 20 internal combustion engine from over-heating, in which when the internal combustion engine is switched off using the ignition lock the high-pressure injection valves are also switched off, while the ignition remains switched on, characterized in that the rotational speed of the internal 25 combustion engine is measured after a specified number (nquery) of revolutions, that the measured rotational speed is compared with a reference rotational speed, and that a leaking high-pressure injection valve is diagnosed if the measured rotational speed is greater than the reference 30 rotational speed.
  7. 7. Method according to Claim 6, characterized in that the rotational speed of the internal combustion engine is
    determined after a specified number (nquery) of revolutions, that the determined rotational speed gradient is compared with a reference rotational speed gradient, and that a leaking high-pressure injection valve is diagnosed if the 5 determined rotational speed gradient is less/greater than the reference rotational speed gradient.
  8. 8. Method according to Claim 6 or 7, characterized in that the leaking high-pressure injection valve is determined 10 from the course of the rotational speed of the internal combustion engine over time.
  9. 9. Method according to one of Claims 6 to 8, characterized in that a signal which indicates the presence of a leaking 15 high-pressure injection valve and/or the leaking high-
    pressure injection valve is output to a fault memory.
  10. 10. Method according to one of Claims 6 to 9, characterized in that after a specified number (nabOrt) of revolutions of 20 the internal combustion engine, the ignition is switched off.
  11. 11. Method according to one of Claims 1 to 9, characterized in that after a leaking high-pressure injection valve is 25 detected, the ignition and the injection system are immediately switched off.
  12. 12. Method according to one of Claims 1 to 11, characterized in that after a leaking high-pressure 30 injection valve is detected, a throttle valve in the suction section of the internal combustion engine is fully opened.
  13. 13. Method of protecting an internal combustion engine from petrol shock, or protecting a catalytic converter of the internal combustion engine from over-heating, in which a method of improving smooth running by individual control of 5 the cylinders determines whether one of the cylinders gives -
    an increased or decreased torque, characterized in that the internal combustion engine is switched off if a decreased torque is detected following an increased torque.
    10
  14. 14. Method according to Claim 13, characterized in that when the internal combustion engine is operated for the first time, limiting values (ZGSTmaX, ZGSTmin) for control of smooth running of the internal combustion engine are determined and stored, in particular in a permanent RAM.
  15. 15. Method according to Claim 13 or 14, characterized in i that a warning signal is output if one of the cylinders gives an increased torque, particularly a torque above a stored limiting value (ZGSTmax)
  16. 16. Method according to one of Claims 1 to 15, characterized in that from the air mass which is sucked out of the internal combustion engine and the quantity of fuel which is injected into the internal combustion engine a -
    25 setpoint value (setpoint) iS formed, that the setpoint value (Asetpoint) is compared with an actual value (AaCtual) which is measured in the exhaust system of the internal combustion engine, and that a redundant warning signal is generated if the setpoint value (\setpoint) iS greater than the measured 30 actual value (AaCtual) by a specified amount (LA).
  17. 17. Any of the methods substantially as hereinbefore described with reference to the accompanying drawings.
GB0306471A 2002-03-21 2003-03-20 Methods of protecting an internal combustion engine Expired - Fee Related GB2387948B (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2002112428 DE10212428B4 (en) 2002-03-21 2002-03-21 Method for protecting an internal combustion engine

Publications (3)

Publication Number Publication Date
GB0306471D0 GB0306471D0 (en) 2003-04-23
GB2387948A true GB2387948A (en) 2003-10-29
GB2387948B GB2387948B (en) 2004-08-04

Family

ID=7714158

Family Applications (1)

Application Number Title Priority Date Filing Date
GB0306471A Expired - Fee Related GB2387948B (en) 2002-03-21 2003-03-20 Methods of protecting an internal combustion engine

Country Status (4)

Country Link
JP (1) JP2003293806A (en)
DE (1) DE10212428B4 (en)
FR (4) FR2837529A1 (en)
GB (1) GB2387948B (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013081529A1 (en) * 2011-12-01 2013-06-06 Scania Cv Ab Method and system pertaining to adaptation of at least one injector for a combustion engine
US9797330B2 (en) 2015-05-15 2017-10-24 Toyota Jidosha Kabushiki Kaisha Engine apparatus
CN110469439A (en) * 2019-08-30 2019-11-19 攀钢集团矿业有限公司 The method of delivery temperature test judgement electromagnetic fuel injector performance

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102005053761B3 (en) 2005-11-10 2007-06-21 Siemens Ag Method and device for operating an internal combustion engine
JP4738306B2 (en) * 2006-09-29 2011-08-03 三菱重工業株式会社 Operation method and operation control device for abnormal combustion of engine
FR2919678A1 (en) * 2007-08-02 2009-02-06 Renault Sas METHOD AND DEVICE FOR DIAGNOSING INJECTOR LEAKAGE IN AN INTERNAL COMBUSTION ENGINE
DE102010041773B4 (en) * 2010-09-30 2013-10-31 Robert Bosch Gmbh Method and arrangement for operating an internal combustion engine

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4962740A (en) * 1988-08-29 1990-10-16 Mitsubishi Denki Kabushiki Kaisha Fuel controller for internal combustion engine
GB2250347A (en) * 1990-11-09 1992-06-03 Bosch Gmbh Robert Ignition system and/or injection system for internal combustion engines
US5168859A (en) * 1989-05-29 1992-12-08 Japan Electronic Control Systems Co., Ltd. Method and apparatus for judging misfire in internal combustion engine
US5201293A (en) * 1990-11-09 1993-04-13 Robert Bosch Gmbh Method of monitoring the operation of an internal combustion engine
US5505087A (en) * 1993-04-27 1996-04-09 Siemens Aktiengesellschaft Method for combustion misfire detection with bad road detection
US5700954A (en) * 1996-10-31 1997-12-23 Ford Global Technologies, Inc. Method of controlling fuel during engine misfire
JP2000248989A (en) * 1999-02-25 2000-09-12 Fuji Heavy Ind Ltd Misfire detecting device for multi-cylinder engine

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3923757A1 (en) * 1988-07-20 1990-01-25 Mitsubishi Electric Corp FUEL REGULATOR FOR INTERNAL COMBUSTION ENGINES
WO1990002874A1 (en) * 1988-09-10 1990-03-22 Robert Bosch Gmbh Engine misfire detection and engine exhaust systems
DE4002208A1 (en) * 1990-01-26 1991-08-01 Bosch Gmbh Robert Detecting misfiring cylinders in IC engine - using existing lambda probe and evacuation of smoothed, averaged amplitude w.r.t. threshold
DE4002207A1 (en) * 1990-01-26 1991-08-01 Bosch Gmbh Robert Catalyser protection by detection misfiring cylinder detection - cutting of fuel to misfiring cylinder and making fuel mixt. to remaining cylinders leaner
DE4003752A1 (en) * 1990-02-08 1991-08-14 Bosch Gmbh Robert METHOD FOR ASSIGNING COMBUSTION ERRORS TO A CYLINDER OF AN INTERNAL COMBUSTION ENGINE
DE19705340C1 (en) * 1997-02-12 1998-08-13 Siemens Ag Method and device for controlling an internal combustion engine
DE19719631A1 (en) * 1997-05-09 1998-09-17 Daimler Benz Ag Method for preventing damage to diesel engine due to high combustion pressures
DE19744067A1 (en) * 1997-10-06 1999-04-08 Bosch Gmbh Robert Building temp. model for exhaust gas region of IC engine based on operating parameters
US6098013A (en) * 1998-05-11 2000-08-01 Caterpillar Inc. System and method for monitoring exhaust gas hydrocarbon content in internal combustion engines
DE19832020C1 (en) * 1998-07-16 1999-04-01 Bosch Gmbh Robert Function monitoring for exhaust fume turbo-loader of combustion engine
DE19922519B4 (en) * 1999-05-15 2010-04-08 Robert Bosch Gmbh Method, control and apparatus for operating a fuel supply system

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4962740A (en) * 1988-08-29 1990-10-16 Mitsubishi Denki Kabushiki Kaisha Fuel controller for internal combustion engine
US5168859A (en) * 1989-05-29 1992-12-08 Japan Electronic Control Systems Co., Ltd. Method and apparatus for judging misfire in internal combustion engine
GB2250347A (en) * 1990-11-09 1992-06-03 Bosch Gmbh Robert Ignition system and/or injection system for internal combustion engines
US5201293A (en) * 1990-11-09 1993-04-13 Robert Bosch Gmbh Method of monitoring the operation of an internal combustion engine
US5505087A (en) * 1993-04-27 1996-04-09 Siemens Aktiengesellschaft Method for combustion misfire detection with bad road detection
US5700954A (en) * 1996-10-31 1997-12-23 Ford Global Technologies, Inc. Method of controlling fuel during engine misfire
JP2000248989A (en) * 1999-02-25 2000-09-12 Fuji Heavy Ind Ltd Misfire detecting device for multi-cylinder engine

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013081529A1 (en) * 2011-12-01 2013-06-06 Scania Cv Ab Method and system pertaining to adaptation of at least one injector for a combustion engine
US9797330B2 (en) 2015-05-15 2017-10-24 Toyota Jidosha Kabushiki Kaisha Engine apparatus
CN110469439A (en) * 2019-08-30 2019-11-19 攀钢集团矿业有限公司 The method of delivery temperature test judgement electromagnetic fuel injector performance

Also Published As

Publication number Publication date
DE10212428A1 (en) 2003-10-02
DE10212428B4 (en) 2004-05-13
GB0306471D0 (en) 2003-04-23
FR2837529A1 (en) 2003-09-26
JP2003293806A (en) 2003-10-15
FR2842254A1 (en) 2004-01-16
FR2842256A1 (en) 2004-01-16
FR2842255A1 (en) 2004-01-16
GB2387948B (en) 2004-08-04

Similar Documents

Publication Publication Date Title
CN106795827B (en) Intake diagnostic for skip fire engines
US7762237B2 (en) Method for determining valve degradation
US5168854A (en) Method and apparatus for detecting failure of pressure sensor in internal combustion engine
KR100959214B1 (en) Misfire detection device for internal combustion engine
KR101201995B1 (en) A method for controlling an internal combustion engine
US20130013165A1 (en) Variable displacement engine diagnostics
US6662781B1 (en) Method and device for electronic spark control in the event of the failure of the phase detector
US5351528A (en) Apparatus and method for detecting misfiring in an internal combustion engine
JP2885813B2 (en) Engine misfire detection and exhaust system
JP3861550B2 (en) Abnormal cylinder detection device for multi-cylinder internal combustion engine
US20130166184A1 (en) Method and device for setting an emergency operational mode in a system which detects pre-ignitions in a combustion engine, and which contains errors
US6336440B1 (en) Misfire detection method for a piston combustion engine with electromagnetic fuel charge valve
KR20170008759A (en) Valve fault detection
US20040107945A1 (en) Engine control method responsive to cylinder misfire detection
GB2387948A (en) Methods of protecting an internal combustion engine
KR20020000872A (en) Method for engine misfire detection in multi-cylinder internal combustion engines with multi-cylinder spark ignition
US10519879B2 (en) Determining in-cylinder pressure by analyzing current of a spark plug
US10465632B2 (en) Method and device for operating a combustion engine
JPH0422743A (en) Combustion detection device for internal combustion engine
WO2007091458A1 (en) Combustion state judging method for internal combustion engine
JP2002180879A (en) Method of protecting internal combustion engine from excessive pressure
CN108397303B (en) Method and device for controlling a mechanism for adjusting a valve lift curve
US10995690B2 (en) Control device of internal combustion engine
US20040112318A1 (en) Method for detecting the phase using $g(l)-change on one or more cylinders
KR102391708B1 (en) Method and device for operating an internal combustion engine

Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20070320