EP4281661A1 - Procede d'alerte d'un risque de calage de moteur thermique - Google Patents
Procede d'alerte d'un risque de calage de moteur thermiqueInfo
- Publication number
- EP4281661A1 EP4281661A1 EP21824630.4A EP21824630A EP4281661A1 EP 4281661 A1 EP4281661 A1 EP 4281661A1 EP 21824630 A EP21824630 A EP 21824630A EP 4281661 A1 EP4281661 A1 EP 4281661A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- threshold
- critical
- vehicle
- speed threshold
- engine
- 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.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 32
- 230000004913 activation Effects 0.000 claims description 3
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- 238000013475 authorization Methods 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims description 2
- 230000006870 function Effects 0.000 description 23
- 238000001514 detection method Methods 0.000 description 6
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000002485 combustion reaction Methods 0.000 description 3
- 238000003786 synthesis reaction Methods 0.000 description 3
- 230000003044 adaptive effect Effects 0.000 description 2
- 102100034112 Alkyldihydroxyacetonephosphate synthase, peroxisomal Human genes 0.000 description 1
- 101100129496 Arabidopsis thaliana CYP711A1 gene Proteins 0.000 description 1
- 101100129499 Arabidopsis thaliana MAX2 gene Proteins 0.000 description 1
- 102100022002 CD59 glycoprotein Human genes 0.000 description 1
- 101100083446 Danio rerio plekhh1 gene Proteins 0.000 description 1
- 101000799143 Homo sapiens Alkyldihydroxyacetonephosphate synthase, peroxisomal Proteins 0.000 description 1
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- 238000000848 angular dependent Auger electron spectroscopy Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 230000007935 neutral effect Effects 0.000 description 1
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
- F02D41/22—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
- F02D41/02—Circuit arrangements for generating control signals
- F02D41/021—Introducing corrections for particular conditions exterior to 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
- F02D41/04—Introducing corrections for particular operating conditions
- F02D41/12—Introducing corrections for particular operating conditions for deceleration
-
- 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
- F02D41/16—Introducing closed-loop corrections for idling
-
- 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
- F02D2041/228—Warning displays
-
- 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
- F02D2200/50—Input parameters for engine control said parameters being related to the vehicle or its components
- F02D2200/501—Vehicle speed
Definitions
- TITLE PROCEDURE FOR ALERT OF A RISK OF THERMAL ENGINE STALL
- the present invention relates to a method for alerting a risk of thermal engine stalling.
- the invention finds a particularly advantageous, but not exclusive, application in the field of motor vehicles equipped with a driving assistance system (in English "Advanced driver-assistance system” or ADAS)
- a driving assistance system in English "Advanced driver-assistance system” or ADAS
- This driving assistance system may have an emergency braking assistance function. This function makes it possible to detect emergency braking and to amplify the braking force exerted by the driver.
- a speed limiter function prevents exceeding a selected maximum speed.
- An adaptive cruise control (“ACC") function makes it possible, with the aid of a detection means which notably measures the distance relative to the vehicle being followed, to adapt the set speed of the cruise control to maintain a distance pre-programmed safety device to the front vehicle.
- ACC adaptive cruise control
- the driving assistance device controls a braking phase
- the driver is often less attentive.
- the unit managing the longitudinal dynamics can then cause the vehicle to stall the thermal engine if the driver does not disengage because there is no way of alerting the driver in advance to this risk.
- the problem of thermal engine stalling is dealt with solely by an engine idle strategy managed by the engine computer which tries to avoid stalling. This is felt by jolts of the heat engine when the risk of stalling is almost certain to arrive.
- the invention aims to remedy this drawback effectively by proposing a method for alerting a risk of stalling of a heat engine of a motor vehicle equipped with a manual gearbox, the method being implemented by an engine computer , said method comprising during a deceleration phase:
- - a step of sending an alert signal to a driver when the critical time falls below a configurable time threshold, so that the driver has enough time to disengage.
- the invention thus makes it possible to anticipate the detection of the risk of stalling so as to warn the driver so that the latter has time to disengage before the occurrence of stalling of the heat engine.
- said method comprises a step of verifying at least one activation authorization condition among the following conditions:
- thermal engine idle speed regulator is active
- the critical speed threshold and/or the critical engine speed threshold is calculated at least from a slope of a road on which the vehicle is traveling and from a gear engaged .
- the process can be implemented as part of a braking phase controlled by a driver assistance system.
- said method comprises a step of cutting off braking carried out by the conduct.
- the method can be implemented outside of a braking phase controlled by a driver assistance system.
- the alert signal is a visual and/or sound and/or haptic signal.
- the configurable time threshold is between 1.5 and 3 seconds and is preferably 2 seconds.
- the invention also relates to an engine computer comprising a memory storing software instructions for implementing the method as defined above.
- the invention further relates to a motor vehicle comprising a computer as defined above.
- FIG. 1 is a schematic representation of a control architecture of a motor vehicle with manual gearbox capable of implementing the method according to the invention for warning of a risk of stalling of the combustion engine;
- Figure 2 shows an evolution as a function of time, of a speed of the motor vehicle, and of a speed of the heat engine following a request for deceleration of the motor vehicle generated by a driving assistance system;
- FIG. 3 illustrates the driver's warning times before the speed of the motor vehicle reaches a critical speed threshold causing the heat engine to stall;
- FIG. 4 illustrates the determination of the critical speed threshold and of the critical speed threshold by means of maps receiving as input the engaged gear ratio and the slope of the road;
- FIG. 5 shows the functional blocks making it possible to check the conditions for activating the method according to the invention for warning of a risk of stalling of the combustion engine
- Figure 6 shows the generic functional blocks making it possible to estimate a critical period at the end of which a critical stall risk threshold will be reached respectively under a controlled braking phase and outside a controlled braking phase;
- FIG. 7 shows the detail of the functional block making it possible to calculate a critical period before stalling of the heat engine under a controlled braking phase
- FIG. 8 shows the detail of the functional block making it possible to calculate a critical time before stalling of the heat engine outside of a controlled braking phase
- FIG. 9 illustrates the various blocks performing a synthesis of the times to generate a warning signal intended for the driver or to order a braking cut-off.
- FIG. 1 shows a control architecture of a motor vehicle with a manual gearbox comprising an engine computer 10 capable of controlling the operation of a heat engine 13.
- the engine computer 10 includes a memory 11 storing software instructions for the implementation of the method for detecting a risk of stalling of the heat engine 13 described in more detail below.
- the steps of the method are executed iteratively, the calculations being updated over time at each calculation step of the engine computer.
- the engine computer 10 is in communication with a driving aid system 12 capable of providing in particular longitudinal control of the vehicle.
- This driving assistance system 12 may comprise an emergency braking assistance function. This function makes it possible to detect emergency braking and to amplify the braking force exerted by the driver.
- a speed limiter function prevents exceeding a selected maximum speed.
- An adaptive cruise control (ACC) function makes it possible, using a detection means which notably measures the distance from the vehicle being followed, to adapt the set speed of the cruise control to maintain a pre-programmed safety distance towards the front vehicle.
- the detection means may in particular take the form of a radar, a camera, a light distance detector (or lidar for "light detection and ranging” in English), GPS, 4G, 5G, or others implemented in communicating vehicles.
- the driver assistance system 12 is capable of sending Idea information relating to a request for deceleration to a system 14 for controlling the trajectory of the vehicle, in particular of the ESP type (for "Electronic Stability Program" in English).
- the ESP system is able to control a braking torque in each wheel of the vehicle via the pressure of hydraulic fluid inside a hydraulic braking circuit or the application of a current for electric brakes.
- the engine computer 10 sends alert information l_al to a man-machine interface 15.
- the man-machine interface 15 can then send an alert signal S_al consisting of a visual signal via the emission of a message or a pictogram on a screen of the vehicle.
- the man-machine interface 15 may emit an audible signal. It is also possible to envisage the generation of a haptic signal by making the steering wheel and/or the seat belt of the motor vehicle vibrate, for example.
- FIG. 2 shows an evolution as a function of time, of a speed of the motor vehicle V_veh, of a speed W_mth of the combustion engine 13, and of a critical speed threshold S_rc.
- a deceleration of the vehicle is requested by the driving assistance system 12. It is then possible to determine a deceleration slope Dec' linked to a drop in the engine speed likely to vary according to the requested deceleration, the gear ratio engaged R, the slope of the road P, the mass of the vehicle and any other physical parameter that may have an impact on the value of the deceleration of the motor vehicle.
- the deceleration slope Dec′ shown in broken lines illustrates the case where the slope of the road P increases or the case where the deceleration request increases.
- the critical speed threshold S_rc is liable to vary dynamically in a range PI_Src as a function of parameters, such as the slope of the road P, the engaged gear ratio R, the mass of the vehicle.
- FIG. 3 illustrates an evolution, as a function of time, of a speed of the motor vehicle V_veh from a time t0 when a driving assistance system 12 requests a deceleration from the motor vehicle.
- FIGS. 4 to 9 are the functional blocks corresponding to the software instructions stored in a memory of the engine computer 10 for the implementation of the method for alerting a risk of stalling according to the present invention. .
- FIG. 4 illustrates the determination of the critical speed threshold S_vc and of the critical speed threshold S_rc by means of maps Cart_vc, Cart_rc receiving as input the engaged gear ratio R and the slope P of the road.
- the map Cart_vc determines the critical speed threshold S_vc from the gear ratio engaged R and the slope P of the road.
- the Cart_rc map determines the critical speed threshold S_rc from the gear ratio engaged R and the slope P of the road.
- FIG. 5 illustrates the activation condition or conditions to be checked for the implementation of the method.
- the method will be implemented if at least one of the following conditions is verified:
- a difference between a current speed V_veh of the vehicle and the critical speed threshold S_vc is less than a threshold S1.
- a subtractor block B1 is used to calculate the difference between the two values V_veh and S_vc and the comparator block B2 to compare the difference with the threshold S1.
- a difference between the current engine speed W_mth and the critical speed threshold S_rc is less than a threshold S2.
- a subtractor block B3 is used to calculate the difference between the two values W_mth and S_rc and the comparator block B4 to compare the difference between these values with the threshold S2,
- the comparator block B5 is used.
- blocks B6 and B8 are applied as input to a block B9 having an AND type logic gate function, which generates output information lact indicating whether the method is authorized to be activated or not.
- FIG. 6 illustrates the generic functional blocks B10 and B11 making it possible to estimate a critical duration Te, Te' at the end of which a critical stall risk threshold will be reached respectively under a braking phase controlled by the assistance system to pipe 12 and outside of a controlled braking phase.
- block B10 determines the critical duration Te under a braking phase controlled from the current speed of the motor vehicle V_veh, from a critical speed threshold S_vc, and from a deceleration value Dec.
- Block B11 determines the critical duration Te' outside a controlled braking phase from the current engine speed W_mth, a critical speed threshold S_rc, and a deceleration value Dec.
- the durations Te and Te' are processed by the block B12 having a synthesis function which selects the duration Te, Te' which is the most critical for the generation of the alarm signal S_al.
- the subtractor block B13 calculates the difference between the current speed V_veh of the vehicle and the critical speed threshold S_vc.
- a divider block B14 divides this difference with the deceleration Dec requested by the driver assistance system 12. Before being applied as input to the divider block B14, the deceleration Dec is transformed into a value compatible with a speed at using a B15 converter multiplying the input (the Dec deceleration) by a predefined time.
- a block B16 calculates the absolute value of the output value of the divider block B14.
- a block B17 having a saturator function is used to limit the absolute value between an upper limit MAX1 and a lower limit MIN1 in order to rule out any outliers.
- the subtractor block B18 calculates the difference between the current speed W_mth of the heat engine and the critical speed threshold S_rc.
- a divider block B19 divides this difference with the deceleration Dec' (expressed in rev/min 2 ) linked to a drop in the engine speed.
- the deceleration Dec' is transformed into a value expressed in rev/min compatible with a speed motor using a B20 converter multiplying the input (deceleration Dec') by a predefined duration.
- a block B21 calculates the absolute value of the output value of the divider block B19.
- a block B22 having a saturator function makes it possible to limit the absolute value between an upper limit MAX2 and a lower limit MIN2 in order to rule out any aberrant values.
- FIG. 9 illustrates the various blocks performing a synthesis of the times to generate an alert signal S_al intended for the driver or to control a braking cut-off via the generation of a signal S_c.
- the comparator block B23 makes it possible to detect when the critical duration Te becomes less than a time threshold S4.
- the comparator block B24 makes it possible to detect when the critical duration Te' becomes less than a time threshold S5.
- the block B25 having an OR gate function generates an alert signal S_al intended for the driver when one of the time conditions is verified.
- the configurable time thresholds S4 and S5 are each between 1.5 and 3 seconds and are preferably 2 seconds so that the driver has enough time to disengage.
- Time thresholds S4 and S5 can be frozen.
- a map Cart_1, Cart_2 is used, making it possible to adapt the thresholds S4 and S5 as a function of the engaged gear ratio R.
- the comparator block B26 makes it possible to detect when the critical duration Te becomes less than a time threshold S6.
- the comparator block B27 makes it possible to detect when the critical duration Te' becomes less than a time threshold S7.
- Block B28 having an OR gate function generates a braking cut-off signal S_c when one of the time conditions is verified.
- the configurable time thresholds S6 and S7 are lower than the time thresholds S4 and S5. Time thresholds S6 and S7 can be frozen.
- a map Cart_3, Cart_4 is used making it possible to adapt the thresholds S6 and S7 as a function of the engaged gear ratio R.
Landscapes
- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Control Of Vehicle Engines Or Engines For Specific Uses (AREA)
- Combined Controls Of Internal Combustion Engines (AREA)
- Control Of Transmission Device (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR2100515A FR3118996B1 (fr) | 2021-01-20 | 2021-01-20 | Procede d'alerte d'un risque de calage de moteur thermique |
PCT/FR2021/052134 WO2022157428A1 (fr) | 2021-01-20 | 2021-11-30 | Procede d'alerte d'un risque de calage de moteur thermique |
Publications (1)
Publication Number | Publication Date |
---|---|
EP4281661A1 true EP4281661A1 (fr) | 2023-11-29 |
Family
ID=75438981
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP21824630.4A Pending EP4281661A1 (fr) | 2021-01-20 | 2021-11-30 | Procede d'alerte d'un risque de calage de moteur thermique |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP4281661A1 (fr) |
CN (1) | CN117043456A (fr) |
FR (1) | FR3118996B1 (fr) |
WO (1) | WO2022157428A1 (fr) |
Family Cites Families (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE7026240U (de) | 1970-07-11 | 1971-12-16 | Bosch Gmbh Robert | Loesbare verbindung zwischen einer kolbenstange und einem kolben. |
JP3409717B2 (ja) * | 1998-11-11 | 2003-05-26 | トヨタ自動車株式会社 | 内燃機関 |
ATE340727T1 (de) * | 2002-02-07 | 2006-10-15 | Luk Lamellen & Kupplungsbau | Verfahren zum verhindern des abwürgens eines motors eines kraftfahrzeuges |
US8255134B2 (en) * | 2009-10-19 | 2012-08-28 | GM Global Technology Operations LLC | Adaptive cruise control downshift request systems for manual transmission vehicles |
FR3012771B1 (fr) * | 2013-11-04 | 2016-01-15 | Continental Automotive France | Procede de prevention de calage d'un moteur utilisant une estimation de vitesse de rotation dudit moteur |
-
2021
- 2021-01-20 FR FR2100515A patent/FR3118996B1/fr active Active
- 2021-11-30 CN CN202180096029.2A patent/CN117043456A/zh active Pending
- 2021-11-30 WO PCT/FR2021/052134 patent/WO2022157428A1/fr active Application Filing
- 2021-11-30 EP EP21824630.4A patent/EP4281661A1/fr active Pending
Also Published As
Publication number | Publication date |
---|---|
WO2022157428A1 (fr) | 2022-07-28 |
CN117043456A (zh) | 2023-11-10 |
FR3118996A1 (fr) | 2022-07-22 |
FR3118996B1 (fr) | 2022-12-02 |
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