DE102021213359A1 - Procedure for diagnosing the plausibility of a signal from an electrical system - Google Patents
Procedure for diagnosing the plausibility of a signal from an electrical system Download PDFInfo
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- DE102021213359A1 DE102021213359A1 DE102021213359.2A DE102021213359A DE102021213359A1 DE 102021213359 A1 DE102021213359 A1 DE 102021213359A1 DE 102021213359 A DE102021213359 A DE 102021213359A DE 102021213359 A1 DE102021213359 A1 DE 102021213359A1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0084—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to control modules
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
- B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
- B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
- B60R16/023—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for transmission of signals between vehicle parts or subsystems
- B60R16/0231—Circuits relating to the driving or the functioning of the vehicle
- B60R16/0232—Circuits relating to the driving or the functioning of the vehicle for measuring vehicle parameters and indicating critical, abnormal or dangerous conditions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0092—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption with use of redundant elements for safety purposes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60K—ARRANGEMENT OR MOUNTING OF PROPULSION UNITS OR OF TRANSMISSIONS IN VEHICLES; ARRANGEMENT OR MOUNTING OF PLURAL DIVERSE PRIME-MOVERS IN VEHICLES; AUXILIARY DRIVES FOR VEHICLES; INSTRUMENTATION OR DASHBOARDS FOR VEHICLES; ARRANGEMENTS IN CONNECTION WITH COOLING, AIR INTAKE, GAS EXHAUST OR FUEL SUPPLY OF PROPULSION UNITS IN VEHICLES
- B60K26/00—Arrangements or mounting of propulsion unit control devices in vehicles
- B60K26/02—Arrangements or mounting of propulsion unit control devices in vehicles of initiating means or elements
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/10—Vehicle control parameters
- B60L2240/12—Speed
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2240/00—Control parameters of input or output; Target parameters
- B60L2240/40—Drive Train control parameters
- B60L2240/42—Drive Train control parameters related to electric machines
- B60L2240/429—Current
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L2250/00—Driver interactions
- B60L2250/26—Driver interactions by pedal actuation
Abstract
Die Erfindung betrifft ein Verfahren zur Diagnose eines Gaspedal-Signals in einem Elektrofahrzeug, wobei eine Plausibilisierung gegen mindestens ein zweites elektrisches Signal, das kein Gaspedal-Signal ist, vorgenommen wird.The invention relates to a method for diagnosing an accelerator pedal signal in an electric vehicle, a plausibility check being performed against at least one second electrical signal that is not an accelerator pedal signal.
Description
Die Erfindung betrifft ein Verfahren für die Plausibilitäts-Diagnose eines Signals eines elektrischen Systems.The invention relates to a method for diagnosing the plausibility of a signal from an electrical system.
Stand der TechnikState of the art
Bei der Diagnose eines Gaspedal-Signals eines Elektrofahrzeugs ist es erforderlich, eine Plausibilisierung gegen ein zweites unabhängigesSignal vorzunehmen. Dazu wird das Signal des Gaspedals doppelt erfasst. Das Signal des Gaspedals beinhaltet die Information, ob das Gaspedal betätigt wird, das heißt, ob Gas gegeben wird. Jedes der beiden Gaspedal-Signale wird separat an eine Recheneinheit gesendet. Beide Signale werden separat elektrisch aufbereitet und in der Software unabhängig voneinander berechnet und danach miteinander verglichen. Sind beide Signale plausibel, dann ist das Signal fehlerfrei und die Diagnose kann positiv abgeschlossen werden.When diagnosing an accelerator pedal signal of an electric vehicle, it is necessary to carry out a plausibility check against a second, independent signal. To do this, the signal from the gas pedal is recorded twice. The signal from the accelerator pedal contains the information as to whether the accelerator pedal is pressed, i.e. whether the accelerator is accelerated. Each of the two accelerator pedal signals is sent separately to a processing unit. Both signals are electrically processed separately and calculated independently of each other in the software and then compared with each other. If both signals are plausible, then the signal is error-free and the diagnosis can be completed positively.
Nachteile sind höhere zu erwartende Kosten für elektrische Komponenten.Disadvantages are higher expected costs for electrical components.
Offenbarung der ErfindungDisclosure of Invention
Um Kosten zu sparen, gibt es elektrische Systeme, bei denen nur ein Gaspedal-Signal ausgeführt wird. Aus diesem Grund gibt es ein zweites, separates Signal, das bei der Diagnose gegen das Gaspedal-Signal plausibilisiert werden muss.In order to save costs, there are electrical systems in which only an accelerator pedal signal is carried out. For this reason, there is a second, separate signal that must be checked for plausibility against the gas pedal signal during diagnosis.
Somit ist es bei der Diagnose erforderlich, eine Plausibilisierung gegen ein weiteres Signal, vorzunehmen.It is therefore necessary in the diagnosis to carry out a plausibility check against a further signal.
Vorteil der Erfindung ist ein Verfahren zur Diagnose eines Gaspedal-Signals, welches in einem Elektrofahrzeug nur ein Signal liefert.The advantage of the invention is a method for diagnosing an accelerator pedal signal, which only supplies one signal in an electric vehicle.
Vorteilhaft wird mindestens ein zweites Signal, das kein Gaspedal-Signal ist, zur Plausibilisierung verwendet.At least one second signal, which is not an accelerator pedal signal, is advantageously used for the plausibility check.
Das zweite separate Signal ist ein Stromsignal, wobei der Strom aus einer Batterie eines Elektrofahrzeugs in einen Elektromotor des Elektrofahrzeugs fließt, wenn das Gaspedal bestätigt wird, wobei der Strom, der aus der Batterie des Elektroahrzeugs in den Elektromotor des Elektrofahrzeugs fließt, bei Betätigung des Gaspedales ansteigt und wieder abfällt, wenn das Gaspedal nicht betätigt wird.
Somit ist in einem definierten Zustand des elektrischen Systems das Gaspedal-Signal proportional zum elektrischen Strom, der durch den elektrischen Motor fließt.The second separate signal is a current signal, wherein current flows from an electric vehicle battery into an electric motor of the electric vehicle when the accelerator pedal is depressed, wherein current flowing from the battery of the electric vehicle into the electric motor of the electric vehicle flows when the accelerator pedal is depressed increases and decreases again when the accelerator pedal is not depressed.
Thus, in a defined state of the electrical system, the accelerator pedal signal is proportional to the electric current flowing through the electric motor.
Vorteilhafterweise startet die Diagnose, wenn das Gaspedal des Elektrofahrzeugs betätigt und der elektrische Motor des Elektrofahrzeugs bestromt wird.The diagnosis advantageously starts when the gas pedal of the electric vehicle is actuated and the electric motor of the electric vehicle is energized.
Die Diagnose läuft kontinuierlich, sobald das elektrisches System gestromt wird, wobei die Freigabe für die Berechnung der Diagnose anhand der Erfüllung definierter Parameter Cond1 und Cond2 erfolgt.
Erfindungsgemäß ist Cond1 eine Geschwindigkeit des Elektrofahrzeugs und Cond2 der Strom ist, der bei Betätigung des Gaspedals von der Batterie zum Elektromotor fließt. Somit ist die Diagnose leicht zu applizieren und kann an verschiedenste elektrische Systeme angepasst werden.The diagnosis runs continuously as soon as the electrical system is powered, whereby the release for the calculation of the diagnosis is based on the fulfillment of defined parameters Cond1 and Cond2.
According to the invention, Cond1 is a speed of the electric vehicle and Cond2 is the current that flows from the battery to the electric motor when the accelerator pedal is pressed. The diagnosis is therefore easy to apply and can be adapted to a wide variety of electrical systems.
Vorteilhaft wird der Stromgradient des Stromes, der von der Batterie zum Elektromotor fließt, und der Gradient des Gaspedal-Signals gemessen.The current gradient of the current flowing from the battery to the electric motor and the gradient of the gas pedal signal are advantageously measured.
Dadurch dass beide Gradienten sowohl positiv als auch negativ sein können, wird der absolute Wert des Gradienten gebildet und nur der absolute Wert verwendet. Damit kann man die Diagnose sowohl bei negativen als auch bei positiven Gradienten verwenden. Somit wird die Diagnose öfter berechnet.Because both gradients can be both positive and negative, the absolute value of the gradient is formed and only the absolute value is used. This means that the diagnosis can be used for both negative and positive gradients. Thus, the diagnosis is calculated more often.
Wenn der Stromgradient größer als ein definierter Schwellenwert ist, soll der Gradient des Gaspedal-Signals einen Wert überschreiten soll, wenn der Stromgradient größer als ein definierter Schwellenwert ist. Somit kann sicher und einfach ein Fehlerfall erkannt werden. Ein Fehlerfall liegt vor, wenn nur ein Gradient sich ändert und der andere nicht.If the current gradient is greater than a defined threshold, the gradient of the accelerator pedal signal should exceed a value if the current gradient is greater than a defined threshold. In this way, an error can be detected safely and easily. An error occurs when only one gradient changes and the other does not.
Weitere Vorteile können den Figuren und der Bechreibung ennommen werden.Further advantages can be found in the figures and the description.
Figurenlistecharacter list
-
1 zeigt ein Verfahren zur Diagnose eines Gaspedal-Signals.1 shows a method for diagnosing an accelerator pedal signal. -
2 zeigt die Signale des Stromgradienten und des Gaspedal-Gradienten.2 shows the signals of the current gradient and the accelerator pedal gradient.
BeschreibungDescription
Im Ausführungsbeispiel ist das zweite separate Signal ein Stromsignal SStrom. Dieser Strom, der aus der Batterie des Elektrofahrzeugs in den Elektromotor des Elektrofahrzeugs fließt, steigt bei Betätigung des Gaspedales, d.h. beim Gas geben an und fällt ab, wenn das Gaspedal nicht betätigt wird, sprich das Gas zurückgenommen wird. Dieser Strom ist das zweite separate Signal.In the exemplary embodiment, the second separate signal is a current signal S current . This current from the battery of the electric vehicle in the electric motor of the electric vehicle increases when the accelerator pedal is pressed, ie when the accelerator is pressed, and falls when the accelerator pedal is not pressed, i.e. the accelerator is released. This current is the second separate signal.
Steht das Elektrofahrzeug, das heißt, der elektrische Motor wird nicht bestromt, startet die Diagnose nicht. Die Diagnose startet, wenn das Gaspedal des Elektrofahrzeugs betätigt und der elektrische Motor des Elektrofahrzeugs bestromt wird.If the electric vehicle is stationary, i.e. the electric motor is not powered, the diagnosis will not start. The diagnosis starts when the electric vehicle's accelerator pedal is pressed and the electric vehicle's electric motor is energized.
Die Freigabe für die Berechnung der Diagnose erfolgt anhand der Erfüllung definierter Parameter. Diese Parameter sind in
Die Geschwindigkeit des Elektrofahrzeugs kann beispielsweise über eine Erfassung der Drehzahl im Elektromotor oder an einem Rad erfolgen, wobei unter Kentnis der Reifengröße die Geschwindigkeit errechnet werden kann.The speed of the electric vehicle can be determined, for example, by detecting the rotational speed in the electric motor or on a wheel, with the speed being able to be calculated when the tire size is known.
Cond2 ist der Strom, der bei Betätigung des Gaspedals von der Batterie zum Elektromotor fließt. Es ist aber auch möglich, dass Cond2 ein anderes Signal des Systems ist, beispielsweise die Batteriespannung, die sich ebenfalls bei Betätigung des Gaspedals ändert.Cond2 is the current that flows from the battery to the electric motor when the accelerator pedal is pressed. However, it is also possible that Cond2 is another signal from the system, for example the battery voltage, which also changes when the accelerator pedal is pressed.
Als zusätzliche Bedingung (Cond3) soll sicher gestellt sein, dass keine Rekuperation stattfindet. In diesem Fall fließt auch Strom vom Motor in die Batterie ohne Betätigung des Gaspedals. Das ist der Fall bei elektrischen Bremsen.As an additional condition (Cond3), it should be ensured that no recuperation takes place. In this case, current also flows from the engine to the battery without depressing the accelerator pedal. This is the case with electric brakes.
Wird in einem Schritt 100 festgestellt, dass alle Bedingungen erfüllt, startet in 110 die Diagnose. Die definierten Werte variieren von Größe und Leistungsfähigkeit des Elektromotors. So kann es sein, dass die Diagnose startet, wenn Cond1 2km/h überschreitet und Cond2 4A überschreitet. Die zu definierenden Werte können an unterschiedliche elektrische Systeme und Anwendungen angepasst werden. Sind alle Parameter erfüllt, wird in 120 zum einen der Stromgradient, das heißt die Änderung des Stroms über der Zeit im elektrischen Motor und zum anderen der Gradient des Gaspedal-Signals, das heißt die Änderung des Gaspedal-Signals über der Zeit, als neues Signal berechnet. Das Ergebnis der berchnung wird in 130 ausgegeben.If it is determined in a
In
Die Diagnose lässt sich also über folgende Parameter einstellen:
- Stromgradient-Parameter: Im Normalbetrieb entsteht ein Stromgradient während der elektrische Motor bestromt wird. Wenn dieser Stromgradient einen eingestellten Schwellenwert im Stromgradient-Parameter überschreitet, wird die Diagnose des Gaspedal-Signals berechnet.
- Gradient-Gaspedal-Signal: Im fehlerfreien Zustand soll der Gradient des Gaspedal - Signals einen eingestellten Schwellenwert im Gaspedalgradient-Parameter überschreiten, dann ist das Gaspedal-Signal fehlerfrei. Ansonsten wird ein Fehler gemeldet.
- Current gradient parameters: In normal operation, a current gradient occurs while the electric motor is energized. If this current gradient exceeds a set threshold in the current gradient parameter, the accelerator pedal signal diagnosis is calculated.
- Gradient accelerator pedal signal: In the error-free state, the gradient of the accelerator pedal signal should exceed a set threshold value in the accelerator pedal gradient parameter, then the accelerator pedal signal is error-free. Otherwise an error is reported.
Claims (10)
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DE102021213359.2A DE102021213359A1 (en) | 2021-11-26 | 2021-11-26 | Procedure for diagnosing the plausibility of a signal from an electrical system |
CN202211489541.6A CN116176451A (en) | 2021-11-26 | 2022-11-25 | Method for diagnosing the plausibility of signals of an electrical system |
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DE102021213359.2A DE102021213359A1 (en) | 2021-11-26 | 2021-11-26 | Procedure for diagnosing the plausibility of a signal from an electrical system |
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Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5801498A (en) | 1995-04-28 | 1998-09-01 | Honda Giken Kogyo Kabushiki Kaisha | Control system for electric vehicle |
DE102013213267A1 (en) | 2013-07-05 | 2015-01-08 | Robert Bosch Gmbh | Method for battery management and battery management system |
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2021
- 2021-11-26 DE DE102021213359.2A patent/DE102021213359A1/en active Pending
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2022
- 2022-11-25 CN CN202211489541.6A patent/CN116176451A/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5801498A (en) | 1995-04-28 | 1998-09-01 | Honda Giken Kogyo Kabushiki Kaisha | Control system for electric vehicle |
DE102013213267A1 (en) | 2013-07-05 | 2015-01-08 | Robert Bosch Gmbh | Method for battery management and battery management system |
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