DE10044953A1 - Control method for electrical vehicle drives with fuel cells involves deriving demanded air compressor revolution rate value from actual revolution rate using stored characteristic - Google Patents

Control method for electrical vehicle drives with fuel cells involves deriving demanded air compressor revolution rate value from actual revolution rate using stored characteristic

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Publication number
DE10044953A1
DE10044953A1 DE10044953A DE10044953A DE10044953A1 DE 10044953 A1 DE10044953 A1 DE 10044953A1 DE 10044953 A DE10044953 A DE 10044953A DE 10044953 A DE10044953 A DE 10044953A DE 10044953 A1 DE10044953 A1 DE 10044953A1
Authority
DE
Germany
Prior art keywords
revolution rate
air compressor
fuel cell
control method
fuel cells
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.)
Withdrawn
Application number
DE10044953A
Other languages
German (de)
Inventor
Herbert Ott
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.)
ZF Friedrichshafen AG
Original Assignee
ZF Friedrichshafen AG
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 ZF Friedrichshafen AG filed Critical ZF Friedrichshafen AG
Priority to DE10044953A priority Critical patent/DE10044953A1/en
Publication of DE10044953A1 publication Critical patent/DE10044953A1/en
Withdrawn legal-status Critical Current

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Classifications

    • 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
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/30—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/40—Application of hydrogen technology to transportation, e.g. using fuel cells

Abstract

The method involves specifying the drive torque demand directly in the form of a demand revolution rate for the air compressor for the fuel cell. The demanded revolution rate value is determined from the current actual revolution rate value of the air compressor using a characteristic stored in the controller.

Description

Die Erfindung betrifft ein Verfahren zur Steuerung von Elektrofahrzeugen mit Brennstoffzelle gemäß dem Oberbegriff des Patentanspruchs 1.The invention relates to a method for controlling Electric vehicles with fuel cells according to the preamble of claim 1.

Elektrofahrzeuge gewinnen zunehmend an Bedeutung wegen der Umweltverträglichkeit. Derartige Fahrzeuge mit Elektro­ antrieben werden heutzutage insbesondere bei öffentlichen Verkehrsmitteln, beispielsweise bei Stadtbussen eingesetzt.Electric vehicles are becoming increasingly important because of this environmental sustainability. Such vehicles with electric Nowadays, especially public ones are driven Transportation, used for example in city buses.

Die bei Elektrofahrzeugen eingesetzten Antriebsmoto­ ren, wie beispielsweise Asynchronmotoren mit Wechselrichter benötigen je nach Leistung und Drehzahl eine entsprechende Zwischenkreisleistung. Der Wunsch des Fahrers nach An­ triebsmoment wird deshalb in einen Sollwert für den Zwi­ schenkreisstrom umgesetzt.The drive motor used in electric vehicles ren, such as asynchronous motors with inverters need a corresponding one depending on the power and speed DC link power. The driver's desire for Driving torque is therefore in a setpoint for the tw circuit circuit implemented.

Die Dynamik der Brennstoffzelle und sonstige Ungenau­ igkeiten bei der Erfassung des Lastzustandes erfordern nach der Vorgabe des Sollwertes für den Zwischenkreisstrom un­ fangreiche Korrekturen und teilweise Reduzierungen der mög­ lichen Fahrleistungen.The dynamics of the fuel cell and other inaccuracies ices in the determination of the load condition require the specification of the setpoint for the intermediate circuit current un extensive corrections and partial reductions in the poss mileage.

Der vorliegenden Erfindung liegt daher die Aufgabe zu­ grunde, ein Verfahren zur Steuerung eines Elektrofahrzeugs Brennstoffzelle anzugeben, welches die obengenannten Nach­ teile vermeidet und den Wunsch nach Antriebsmoment mög­ lichst präzise, ohne umfangreiche Korrekturen realisiert, bei einer gleichzeitigen maximalen Ausnutzung der Leistung der Brennstoffzelle. The present invention therefore has the object reasons, a method for controlling an electric vehicle Specify fuel cell, which the above avoids parts and the desire for drive torque possible realized as precisely as possible, without extensive corrections, with simultaneous maximum utilization of the performance the fuel cell.  

Diese Aufgabe wird durch die Merkmale des Patentan­ spruchs 1 gelöst. Weitere Ausgestaltungen und Varianten gehen aus den Unteransprüchen hervor.This task is accomplished through the features of the patent spell 1 solved. Other designs and variants emerge from the subclaims.

Demnach wird vorgeschlagen, den Fahrerwunsch nach An­ triebsmoment als Solldrehzahl für den Luftpresser der Brennstoffzelle direkt vorzugeben und den Drehmomentsoll­ wert aus der bestehenden aktuellen Istdrehzahl für den Luftpresser nach einer Kennlinie in der Steuerung zu ermit­ teln.Accordingly, it is proposed to change the driver's request drive torque as the target speed for the air compressor Specify the fuel cell directly and set the torque value from the existing actual speed for the Air compressor according to a characteristic curve in the control stuffs.

Der Fahrerwunsch wird parallel dazu in einem Drehmo­ mentensollwert umgerechnet und mit obigem Sollwert vergli­ chen. Erfindungsgemäß wird für die Regelung immer der klei­ nere Sollwert verwendet.The driver request is made in parallel in a torque ment setpoint converted and compared with the above setpoint chen. According to the invention, the klei is always used for the control nere setpoint used.

Eine Überlastung der Brennstoffzelle wird durch einen Unterspannungsbegrenzer im Wechselrichter verhindert, der bei zu kleinen Spannungswerten den Drehmomentsollwert redu­ ziert.The fuel cell is overloaded by a Undervoltage limiter in the inverter prevents the if the voltage values are too low, the torque setpoint redu ed.

Durch das erfindungsgemäße Verfahren wird die Leistung der Brennstoffzelle immer maximal ausgenutzt.Through the method according to the invention, the performance maximum use of the fuel cell.

Des weiteren müssen Unterschiede in der Dynamik der Brennstoffzelle nicht erfaßt und korrigiert werden, da die Leistungsabnahme der Elektromotoren lediglich von dem Zwi­ schenkreis abhängig ist.Furthermore, differences in the dynamics of the Fuel cells cannot be recorded and corrected because of the Power consumption of the electric motors only from the Zwi donation circle is dependent.

Eine zu geringe Belastung der Brennstoffzelle wird durch das Verfahren gemäß der Erfindung verhindert, da Restwasserstoff im Brennstoffzellenkreislauf zu einer Lei­ stungsreduzierung führen kann.An insufficient load on the fuel cell will prevented by the method according to the invention since Residual hydrogen in the fuel cell circuit to a lei reduction in performance.

Die Erfindung wird im folgenden anhand der Zeichnung näher erläutert.The invention is described below with reference to the drawing explained in more detail.

In dieser stellen dar:In this represent:

Fig. 1 ein Blockschaltbild des Verfahrens gemäß der vorliegenden Erfindung und Fig. 1 is a block diagram of the method according to the present invention and

Fig. 2 eine Leistungs/Drehzahlkennlinie zur Ermitt­ lung des Drehmomentsollwertes aus der beste­ henden momentanen Istdrehzahl für den Luft­ presser. Fig. 2 is a power / speed characteristic curve for determining the torque setpoint from the existing existing actual speed for the air presser.

Gemäß Fig. 1 wird der Fahrerwunsch nach Antriebsmoment direkt in Form einer Solldrehzahl an den Luftpresser der Brennstoffzelle vorgegeben. Der entsprechende Drehmoment­ sollwert wird anschliessend aus der bestehenden Istdrehzahl für den Luftpresser nach einer in der Steuerung abgelegten Kennlinie ermittelt. Parallel dazu wird die Antriebsmomen­ tanforderung in der Steuerung in einen Drehmomentsollwert umgerechnet und mit dem aus der Kennlinie ermittelten Drehmomentsollwert verglichen, wobei der kleinere beider Werte verwendet wird.According to FIG. 1, the driver's request for drive torque is specified directly in the form of a target speed to the air compressor of the fuel cell. The corresponding torque setpoint is then determined from the existing actual speed for the air compressor according to a characteristic curve stored in the control. At the same time, the drive torque request in the control is converted into a torque setpoint and compared with the torque setpoint determined from the characteristic curve, the smaller of the two values being used.

Ein Beispiel für die Leistungs-/Drezahl-Kennlinie ist in Fig. 2 gezeigt.An example of the power / speed characteristic is shown in FIG. 2.

Claims (3)

1. Verfahren zur Steuerung für Elektrofahrzeuge mit Brennstoffzelle, dadurch gekennzeichnet, dass die Antriebsmomentanforderung direkt als Solldrehzahl für den Luftpresser an die Brennstoffzelle vorgegeben wird. 2. Verfahren nach Anspruch 1, dadurch gekenn­ zeichnet, dass der Drehmomentsollwert aus der bestehenden Istdrehzahl für den Luftpresser nach einer in der Steuerung abgelegten Kennlinie ermittelt wird.1. Control method for electric vehicles with a fuel cell, characterized in that the drive torque request is specified directly as the target speed for the air compressor to the fuel cell. 2. The method according to claim 1, characterized in that the torque setpoint is determined from the existing actual speed for the air compressor according to a characteristic curve stored in the control. 3. Verfahren nach Anspruch 2, dadurch gekenn­ zeichnet, dass die Antriebsmomentanforderung par­ allel in einen Drehmomentsollwert umgerechnet und mit dem Drehmomentsollwert nach Anspruch 2 verglichen wird, wobei der kleinere beider Werte verwendet wird.3. The method according to claim 2, characterized records that the drive torque request par allel converted into a torque setpoint and with the Torque setpoint is compared according to claim 2, wherein the smaller of both values is used. 4. Verfahren nach einem der vorangehenden Ansprüche, dadurch gekennzeichnet, dass eine Überla­ stung der Brennstoffzelle durch einen Unterspannungsbegren­ zer im Wechselrichter derart verhindert wird, dass bei zu kleinen Spannungswerten der Drehmomentsollwert reduziert wird.4. The method according to any one of the preceding claims, characterized in that an overlaid of the fuel cell by an undervoltage limiter zer in the inverter is prevented in such a way that with too small voltage values the torque setpoint is reduced becomes.
DE10044953A 2000-09-12 2000-09-12 Control method for electrical vehicle drives with fuel cells involves deriving demanded air compressor revolution rate value from actual revolution rate using stored characteristic Withdrawn DE10044953A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE10044953A DE10044953A1 (en) 2000-09-12 2000-09-12 Control method for electrical vehicle drives with fuel cells involves deriving demanded air compressor revolution rate value from actual revolution rate using stored characteristic

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE10044953A DE10044953A1 (en) 2000-09-12 2000-09-12 Control method for electrical vehicle drives with fuel cells involves deriving demanded air compressor revolution rate value from actual revolution rate using stored characteristic

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DE10044953A1 true DE10044953A1 (en) 2002-03-21

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4322765C1 (en) * 1993-07-08 1994-06-16 Daimler Benz Ag Dynamic power regulation system for vehicle electric drive unit - regulates power output delivered by fuel cell using correction of oxidant mass flow rate
DE19540824A1 (en) * 1995-11-02 1997-05-07 Daimler Benz Ag Method for dynamically adjusting the power for a vehicle with a fuel cell
DE19541575C2 (en) * 1995-11-08 1998-12-17 Dbb Fuel Cell Engines Gmbh Method for determining a load setpoint for a load-dependent power generation system in an electric vehicle

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4322765C1 (en) * 1993-07-08 1994-06-16 Daimler Benz Ag Dynamic power regulation system for vehicle electric drive unit - regulates power output delivered by fuel cell using correction of oxidant mass flow rate
DE19540824A1 (en) * 1995-11-02 1997-05-07 Daimler Benz Ag Method for dynamically adjusting the power for a vehicle with a fuel cell
DE19541575C2 (en) * 1995-11-08 1998-12-17 Dbb Fuel Cell Engines Gmbh Method for determining a load setpoint for a load-dependent power generation system in an electric vehicle

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