Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
  • F02N11/00—Starting of engines by means of electric motors
  • F02N11/08—Circuits or control means specially adapted for starting of engines
  • F02N11/0814—Circuits or control means specially adapted for starting of engines comprising means for controlling automatic idle-start-stop
  • F02N11/0818—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode
  • F02N11/0825—Conditions for starting or stopping the engine or for deactivating the idle-start-stop mode related to prevention of engine restart failure, e.g. disabling automatic stop at low battery state
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
  • F02N11/00—Starting of engines by means of electric motors
  • F02N11/04—Starting of engines by means of electric motors the motors being associated with current generators
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
  • F02N11/00—Starting of engines by means of electric motors
  • F02N11/10—Safety devices
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
  • F02N2200/00—Parameters used for control of starting apparatus
  • F02N2200/04—Parameters used for control of starting apparatus said parameters being related to the starter motor
  • F02N2200/045—Starter temperature or parameters related to it
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
  • F02N2200/00—Parameters used for control of starting apparatus
  • F02N2200/06—Parameters used for control of starting apparatus said parameters being related to the power supply or driving circuits for the starter
  • F02N2200/061—Battery state of charge [SOC]
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
  • F02N—STARTING OF COMBUSTION ENGINES; STARTING AIDS FOR SUCH ENGINES, NOT OTHERWISE PROVIDED FOR
  • F02N2200/00—Parameters used for control of starting apparatus
  • F02N2200/06—Parameters used for control of starting apparatus said parameters being related to the power supply or driving circuits for the starter
  • F02N2200/064—Battery temperature
• • 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
  • Y02T10/00—Road transport of goods or passengers
  • Y02T10/10—Internal combustion engine [ICE] based vehicles
  • Y02T10/40—Engine management systems

Definitions

• the present invention relates to a method for controlling a device for automatically stopping and restarting the engine of a vehicle, in particular a motor vehicle.
• a device for stopping and restarting the engine hereinafter referred to as "A & R device” and designated by "Stop & Start in English).
• the engine stop is automatically controlled whenever the vehicle speed is practically zero and the engine automatically restarts following a need expressed by the driver (for example action on the accelerator pedal or release of the brake pedal) or following a need of the vehicle (for example to maintain the temperature of certain elements, to maintain heating in the cabin in winter or air conditioning in summer or to maintain the temperature of the catalyst and therefore its effectiveness).
• the device A & R comprises a logic circuit connected to sensors controlling the occurrence of certain conditions and if one or more of these conditions appear, the device A & R controls either stopping the engine (by cutting off the fuel injection by example), or restarting the engine when the engine is stopped.
• the restart is carried out through an electrotechnical chain comprising electrical energy storage means connected to a reversible alternator, itself connected to the crankshaft of the engine by a system of pulleys and transmission belt.
• the electrical energy storage means may consist of one or more batteries or a super capacity.
• the storage means, as well as the various electrical equipment of the vehicle, are powered by the alternator when the latter is driven by the engine (transformation of mechanical energy into electrical energy).
• the alternator operates in an electric motor, powered by the storage means, it actuates the rotation of the crankshaft (transformation of electrical energy into mechanical energy).
• the engine can be started by the alternator.
• the patent application FR 2 816 891 filed by the applicant describes a control system for starting and automatic shutdown of a vehicle engine.
• a calculator containing a motor control algorithm operates according to the following parameters: vehicle speed, gear speed engaged, clutch position, engine speed, engine temperature, vehicle inclination, door switch, and vehicle lock. 'alternator.
• the device described in this patent application works properly, it has the disadvantage of not taking into account the elements of the electrotechnical chain. In extreme or critical conditions, the performance of the alternator or storage means may not be sufficient to ensure the restart of the engine. These elements are then oversized in order to be able to restart the motor, whatever the conditions, which leads to an additional cost of these elements and a larger footprint. However, these critical conditions only occur in about 10% of the total driving time of the vehicle.
• the present invention is to detect these critical conditions and to inhibit the A & R function when these conditions occur. This avoids the oversizing of the alternator and storage means of the electrical energy and thus realizes savings in cost, weight and space of this equipment.
• the invention relates to a method for controlling a device for automatically stopping and restarting a thermal engine of a vehicle comprising means for storing electrical energy and a reversible alternator connected to the engine.
• the method comprises: comparing the temperature of the alternator to a first predetermined temperature,
• the temperature of the alternator is advantageously that of its stator.
• the first predetermined temperature is between 1 1 0 0 C and 150 ° C, preferably about 130 ° C; the predetermined threshold of the charge level is less than 90%, preferably approximately 80%, of the maximum charge level;
• the second predetermined temperature is between -15 ° C. and + 5 ° C., preferably close to -1 ° C.
• said two conditions are taken into account to inhibit or not the automatic restart of the engine.
• the automatic stopping of the motor is inhibited if the temperature of the alternator is higher than the first predetermined temperature and if at least one of the two conditions relating to the storage means appears. .
• FIG. a diagram illustrating the process according to the invention.
• the device for automatically stopping and restarting a controlled or piloted thermal engine comprises sensors, a logic circuit, a reversible alternator (able to operate as a current generator or an electric motor) and storage means. 'electric energy. These can consist of one or more battery (s) or a "super capacity" (capacitor large capacity), charged (s) by the alternator when the latter operates as a current generator.
• the sensors are temperature probes, one dedicated to the stator temperature and the other to the storage means (preferably the internal temperature of the storage means), as well as a voltmeter and / or ammeter controlling the charge level. storage means. These sensors are connected to the logic circuit, which contains in memory a control algorithm of the device, this algorithm including the steps of the method of the invention.
• the temperature of the alternator can also be controlled by the temperature of the rotor. For this, the rotor being fed by a DC voltage, the intensity of the current flowing in the rotor is measured. The temperature of the rotor is determined from the intensity of the current.
• steps 10, 12 and 14 of the method are carried out using a logic circuit. preferably a microprocessor.
• the step 10 of the method consists in detecting the internal temperature of the alternator, the step 12 in detecting the internal temperature of the storage means and the step 14 in detecting the state of charge of the electrical energy storage means.
• Step 16 is to compare:
• the predetermined threshold is expressed as a percentage of the maximum charge value, the latter corresponding to the fully charged electrical energy storage means.
• step 18 it is determined whether at least one of the critical conditions has been obtained. If this is not the case, the automatic shutdown and restart function of the heat engine is not inhibited (step 20). If this is the case, it is determined in step 22 whether the engine is stopped. If the engine is not stopped, it is forbidden to stop the engine by the A & R function (step 24). If the engine is stopped, it is forbidden to stop the engine by the A & R function and the engine is restarted using the traditional starter (step 26).
• step 18 is then returned to determine again if at least one of the critical conditions is reached.
• the values of the first and second temperatures, as well as the load threshold of the storage means depend on the characteristics of the heat engine. For example, a diesel engine requires more torque for startup. With equal capacity of electrical energy storage means, the critical level of load threshold for a diesel engine will be predetermined at a higher value than for a gasoline engine. However, it is possible to indicate the following values: the first critical temperature (of the alternator) can be between 110 ° C. and 150 ° C., preferably close to 130 ° C. the second critical temperature (storage means) can be between -15 ° C and + 5 ° C, preferably close to -10 ° C, and the load threshold level of the storage means can be less than or equal to 90%, preferably close to 80%.
• the combination of the different parameters between them is important for determining the critical values. For example, if only one of the parameters reaches a value within the range of critical values mentioned above (for example from 110 ° C. to 150 ° C. for the alternator temperature), the critical value for this parameter may be chosen at a high value in the field (for example 140 0 C). On the other hand, if two or three of the parameters reach values located in the different critical value ranges, it will be possible to predetermine more severe critical values (for example, 0 ° C. for the critical temperature of the storage means and 12 ° C. for the temperature). critical of the alternator). On average we can for example take the value of 13O 0 C for the first temperature (critical temperature of the alternator), -1 O 0 C for the second temperature (temperature of the energy storage means) and a threshold of load level of 80% for storage means.
• step 10 it is possible to take into account only the temperature of the alternator (step 10) and only one of the two steps 12 and 14 concerning the storage means of the electrical energy, respectively the temperature and the level of charge.
• the invention makes it possible to optimize the design of the alternator and the electrical energy storage means, by dimensioning these elements at the nominal operating conditions and no longer to satisfy all the operating conditions (in particular under extreme conditions, for example). example -20 ° C for a battery). This optimizes the cost of these elements according to the desired performance of the device A & R. The robustness of the starts with the A & R function is increased thanks to the control of the critical conditions.
• the invention also makes it possible to limit the power of the reversible alternator in starter mode and thus to reduce the intensity of the electric current that it consumes. The voltage at the terminals of the various electrical equipment of the vehicle is therefore more stable, which limits the dimensioning of the system whose function is to maintain substantially constant electrical voltage at the terminals of these electrical equipment.

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• 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)

Applications Claiming Priority (2)

Publications (1)

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• 2006
  • 2006-11-15 FR FR0654903A patent/FR2908477B1/fr not_active Expired - Fee Related
• 2007
  • 2007-10-30 US US12/515,077 patent/US8047173B2/en not_active Expired - Fee Related
  • 2007-10-30 JP JP2009536767A patent/JP2010509544A/ja active Pending
  • 2007-10-30 WO PCT/FR2007/052278 patent/WO2008059152A1/fr active Application Filing
  • 2007-10-30 EP EP07866520A patent/EP2089630A1/fr not_active Ceased

Non-Patent Citations (2)

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