JP2019180229A - Method for supporting adjustment of heat engine by rotary electric machine - Google Patents

Abstract

To improve a torque control in a support phase of an adjustment of a heat engine via the torque control in a closed loop while restricting as much as possible the use of a plotting method which requires time to develop because it has a large memory space.SOLUTION: A method for supporting an adjustment of a heat engine 11 by generating a resistance torque mainly by a rotary electric machine 10, includes: a step of receiving a resistance setting torque specifically obtained by an engine computer 15; a step of measuring or estimating a resistance torque Tem added by the rotary electric machine 10; a step of comparing the resistance setting torque with the resistance torque Tem added in order to determine a difference of the torques; a step of correcting the difference of the torques in order to obtain a setting excitation current; and a step of applying an excitation current corresponding to the setting excitation current to a winding type rotator 19 when each phase (U, V, and W) of a polyphase stator 18 is short-circuited so as to generate the resistance torque by the rotary electric machine 10.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a method for assisting in the adjustment of an automotive heat engine by means of a rotating electrical machine.

  In a known manner, a reversible electric machine may be coupled to a heat engine, in particular via an accessory facade.

  This electrical machine, commonly known as an alternator-starter, can operate in a power generation mode to recharge the vehicle's battery and in a motor mode to supply torque to the vehicle.

  The power generation mode may be used in a regenerative braking function that allows the electric machine to supply electrical energy to the battery during the braking phase.

  In the motor mode, in particular, in the function of supporting the adjustment of the heat engine in the function of stopping and automatically restarting the heat engine according to traffic conditions (so-called STT for the stop and start function), the electric machine is in the thermal mode. In the so-called boost function that allows intermittent support of the heat engine during the driving phase of the engine, as well as slow down or shut down the engine to minimize pollutant emissions as well as fuel consumption Therefore, it may be used in a freewheeling function known as coasting that allows the opening of the traction chain to be automated without an explicit operation by the driver.

  During the implementation of the function that assists in the adjustment of the heat engine, inadequate control of the set torque can cause various problems. Thus, insufficient torque collection can cause vibration of the heat engine and thus the vehicle, whereas excessive torque collection can damage units on the accessory facade of the heat engine.

  The object of the present invention is to provide torque control during the assist phase of adjusting the heat engine via torque control in a closed loop while taking the time to develop and limiting the use of large plotting methods as much as possible in terms of memory space. Is to improve.

More specifically, the subject of the present invention is a method for assisting the regulation of a heat engine by generating a resistance torque by means of a rotating electrical machine, said rotating electrical machine comprising:
-A wound rotor designed to carry excitation current;
-A multiphase stator comprising a plurality of phases;
The method comprises
-Receiving a resistance setting torque, in particular obtained from the engine computer;
-Measuring or estimating the resistance torque applied by the rotating electrical machine to the crankshaft of the heat engine;
-Comparing the resistance setting torque with the applied resistance torque to determine the torque difference;
-Correcting the torque difference to obtain the set excitation current;
Applying an excitation current corresponding to the set excitation current to the wound rotor when the phases of the multiphase stator are short-circuited so that the rotating electrical machine generates a resistance torque;
It is characterized by including.

  According to one embodiment, the resistance torque is estimated from the rotational speed of the rotor, from the measured excitation current, and from the internal resistance of the multiphase stator.

  According to one embodiment, the internal resistance is determined from the temperature of the stator that is measured or estimated.

  According to one embodiment, the method determines, from the rotor excitation current, the rotor magnetic flux squared, the quadrature stator inductance square, and the product of the DC stator inductance and the orthogonal stator inductance. including.

  According to one embodiment, each of the following data corresponds to the corresponding plotting method: the rotor magnetic flux squared, the orthogonal stator inductance squared, and the DC stator inductance and orthogonal stator inductance product respectively. It is determined by the dimension.

  According to one embodiment, the method includes determining an electrical speed from the rotational speed of the rotor.

According to one embodiment, the resistance torque is estimated from the following equation:
-Tem is the estimated resistance torque,
− Ω is the electrical speed of the rotating electrical machine,
-Rs is the internal resistance of the multiphase stator;
-Φ ₀ is the magnetic flux of the rotor,
-Lq is the orthogonal stator inductance;
-Ld is the DC stator inductance,
-Npp is the number of pole pairs;
Nφ is the number of phases of the rotating electrical machine.

  According to one embodiment, the rotational speed of the rotor is measured by a Hall effect analog sensor.

  The invention also relates to a control module comprising a memory for storing software instructions for performing the method as described above.

  The invention also relates to a control module for a rotating electrical machine, the control module being configured to implement a method for estimating a direct current generated by a rotating electrical machine as described above. A logic circuit or an integrated circuit is provided.

  The invention will be better understood by reading the following description and examining the accompanying figures. These figures are provided purely by way of example and do not limit the invention in any way.

FIG. 2 is a functional schematic diagram of an alternator implementing the method according to the invention for estimating the torque applied during the support phase of the adjustment of the heat engine. 1 is a schematic diagram of an estimation device for torque applied by a rotating electrical machine during a heat engine adjustment assistance phase according to the present invention; FIG. It is a functional schematic diagram of the main modules of the torque estimation device according to the present invention. FIG. 3 is a functional schematic diagram of a module that allows processing an equation for estimating the torque applied by a rotating electrical machine. 1 is a schematic diagram of torque control of a rotating electric machine in a closed loop during a support phase of adjustment of a heat engine according to the present invention. FIG.

  Identical, similar, or similar components retain the same reference numerals from one figure to another.

  FIG. 1 schematically represents an alternator-starter 10 according to the invention. The alternator-starter 10 is designed to be installed in a vehicle with an in-vehicle electrical network connected to a battery 12. The in-vehicle network may be a 12V, 24V, or 48V type. The alternator-starter 10 is coupled to the heat engine 11 in a manner known per se by a system having a belt 11 'or chain implanted in the accessory facade.

  In addition, the alternator-starter 10 can communicate with the engine computer 15 according to a LIN (local interconnect network) type or CAN (controller area network) type communication protocol, for example a serial system bus.

  The alternator-starter 10 can operate in an alternator mode, also known as a power generation mode, or a motor mode.

  In particular, the alternator-starter 10 comprises an electrotechnical part 13 and a control module 14.

  More specifically, the electrotechnical portion 13 comprises an armature element 18 and an inductor element 19. According to an example, the armature 18 is a stator, and the inductor 19 is a rotor including an exciting coil 20. The stator 18 includes several phase numbers nφ. In a related example, the stator 18 includes three phases U, V, and W. As a variant, the number of phases nφ may be equal to 5, for 5 phase machines, 6 for 6 phase or double 3 phase type machines, or 7 for 7 phase machines. The phases of the stator 18 may be combined in the form of a triangle or a star. Combinations of triangles and star combinations may also be envisaged.

  The control module 14 includes an excitation circuit 141 that incorporates a chopper in order to generate an excitation current injected into the excitation coil 20. The excitation current may be measured using, for example, a Hall effect sensor.

  Measurement of the angular position and angular velocity of the rotor 19 may be performed using Hall effect analog sensors H 1, H 2, H 3 and by an associated magnetic target 25 that rotates together with the rotor 19.

  The control module 14 also includes a control circuit 142 that controls the inverter 26 in accordance with a control signal obtained from the engine computer 15 and received via the signal connector 24.

  Inverters 26 each allow selectively connecting corresponding phases U, V, W of stator 18 to ground or to supply voltage B + of battery 12 depending on the open or closed state. It has an arm with two switching elements. The switching element is preferably a MOSFET type power transistor.

  In the following, referring to FIGS. 2 and 3 for a method according to the invention for estimating the resistance torque Tem applied by the rotating electrical machine 10 to the crankshaft of the heat engine 11 during the assisting phase of the adjustment of the heat engine 11 An explanation is provided. The control module 14 may include a memory that stores software instructions for its implementation. As a variant, the control module 14 is configured to implement a programmable logic circuit, for example in the form of an FPGA (representing a field-programmable gate array) or a CPLD (representing a composite programmable logic device), or a method according to the invention. Integrated circuits such as ASIC (representing an application specific integrated circuit).

  More specifically, the module 14 estimates the resistance torque Tem from the measured rotational speed Wmel_mes, from the measured excitation current lexc_mes, and from the internal resistance of the multiphase stator 18. The rotational speed Wmel_mes is measured by the Hall effect sensors H1, H2, and H3 described above. The excitation current lexc_mes is measured by a corresponding Hall effect sensor. The internal resistance Rs is determined from the measured or estimated temperature of the stator 18.

For this purpose, the square of the rotor flux Φ ₀ ² , the square Lq ^{2 of} the quadrature stator inductance, and the product of the DC stator inductance Ld and the quadrature stator inductance Lq are derived from the rotor excitation current lexc_mes. It is determined.

Thus, the excitation current lexc_mes is applied to the input of the construction method C1 with a dimension that makes it possible to obtain the square of the rotor flux Φ ₀ ² at the output. The excitation current lexc_mes is applied to the input of the construction method C2 with dimensions that make it possible to obtain the square Lq ² of the orthogonal stator inductance at the output. The excitation current lexc_mes is applied to the input of the construction method C3 with dimensions that make it possible to obtain the product Ld * Lq of the DC stator inductance and the orthogonal stator inductance at the output.

  Module M2 makes it possible to determine the electrical speed from the rotational speed Wmel_mes of the rotor.

  The module M3 shown in FIG. 4 makes it possible to estimate the resistance torque Tem from the aforementioned inputs.

For this purpose, the function block B1 makes it possible to obtain
ω ・ Φ ₀ ²・ Rs

The function blocks B2, B3, B4, B5 make it possible to obtain
Rs ² + ω ² · Lq ²

The function blocks B6, B7, and B8 make it possible to obtain
(Rs ² + ω ² · LdLq) ²

Modules B9 and B10 then make it possible to derive the resistance torque Tem from the following equation:
− Ω is the electrical speed of the rotating electrical machine,
Rs is the internal resistance of the multiphase stator 18;
-Φ ₀ is the magnetic flux of the rotor 19,
-Lq is the orthogonal stator inductance;
-Ld is the DC stator inductance,
-Npp is the number of pole pairs;
Nφ is the number of phases of the rotating electrical machine 10.

  In the following, an adjustment loop 30 is described with reference to FIG. 5 which makes it possible to control the resistance torque Tem applied by the electric machine 10 to the crankshaft of the heat engine during the adjustment phase of the heat engine 11.

  For this purpose, the comparator Comp compares the resistance setting torque Tcons with the resistance torque Tem applied by the electric machine in order to determine the torque difference E.

  The resistance setting torque Tcons received by the rotating electrical machine 10 is obtained in particular from the engine computer 15. As a modification, the set torque Tcons may be generated by the electric machine 10.

  In the illustrated example, the resistance torque Tem applied to the crankshaft of the heat engine by the rotating electric machine 10 is estimated by the module M1 described above. As a variant, the resistance torque Tem may be measured by a torque meter or estimated by another type of algorithm.

  The module M4 ensures the correction of the torque difference E in order to obtain the set excitation current lexc_cons. The correction can be of the PI type (representing proportional and integral) or PID type (representing proportional, integral and derivative), for example.

  Next, an excitation current corresponding to the set excitation current lexc_cons is applied to the wound rotor 19, whereas the phases of the multiphase stator 18 are short-circuited so that the electric machine generates a resistance torque Tem. The

  For this purpose, the set excitation current lexc_cons is applied to an adjustment module comprising a comparator in a known manner in order to determine the difference by comparing the value of the excitation current lexc_mes applied to the rotor 19 with the set current lexc_cons. Is done. This current difference represents, for example, a PI type (representing proportionality and integral) or a PID type (representing proportionality, integral and derivative) in order to derive the duty ratio transmitted from the corrector to the excitation circuit 141 of the coil of the rotor 19. ) Applied to the input of the corrector.

  It is understood that the foregoing description is provided purely by way of example and is not intended to limit the field of the invention, and that departures from the invention may not be constructed by replacing different elements with other equivalents. It will be.

  In addition, different features, variations, and / or embodiments of the invention may be associated with each other according to various combinations, provided that they are not incompatible or not mutually exclusive.

Claims (10)

A method for assisting the adjustment of a heat engine (11) by generating a resistance torque by means of a rotating electrical machine (10), said rotating electrical machine (10) comprising:
A wound rotor (19) designed to allow excitation current (lexc_mes) to flow;
A multiphase stator (18) comprising a plurality of phases (U, V, W),
The method comprises
Receiving a resistance setting torque (Tcons) obtained in particular from the engine computer (15);
Measuring or estimating a resistance torque (Tem) applied to the crankshaft of the heat engine (11) by the rotating electrical machine (10);
Comparing the resistance setting torque (Tcons) with the applied resistance torque (Tem) to determine a torque difference (E);
Correcting the torque difference (E) to obtain a set excitation current (lexc_cons);
The set excitation current (lexc_cons) when the phases (U, V, W) of the multiphase stator (18) are short-circuited so that the rotating electrical machine (10) generates the resistance torque. Applying an excitation current corresponding to 1 to the wound rotor (19);
A method comprising the steps of:   The resistance torque (Tem) is estimated from the rotational speed (Wmel_mes) of the rotor, from the measured excitation current (lexc_mes) and from the internal resistance (Rs) of the multiphase stator (18). The method of claim 1, characterized in that   The method according to claim 2, characterized in that the internal resistance (Rs) is determined from the temperature of the stator measured or estimated. From the excitation current of the rotor (lexc_mes), the rotor magnetic flux squared (Φ ₀ ² ), quadrature stator inductance square (Lq ² ), and DC stator inductance (Ld) and quadrature stator Method according to claim 2 or 3, characterized in that it comprises the step of determining the product with the inductance (Lq). The following data: square of the magnetic flux of the rotor (Φ ₀ ² ), square of the quadrature stator inductance (Lq ² ), and the DC stator inductance (Ld) and the quadrature stator inductance ( Method according to claim 4, characterized in that each of said products with Lq) is determined by a corresponding construction method (C1, C2, C3), in particular dimensions.   6. The method according to claim 2, comprising determining an electrical speed (ω) from the rotational speed (Wmel_mes) of the rotor. 7. The resistance torque (Tem) is estimated from the following equation:
Tem is the estimated resistance torque,
ω is the electric speed of the rotating electrical machine (10),
Rs is the internal resistance of the multiphase stator (18);
Φ ₀ is the magnetic flux of the rotor (19),
Lq is the orthogonal stator inductance,
Ld is the DC stator inductance,
npp is the number of pole pairs,
Method according to claims 4 and 6, characterized in that nφ is the number of phases of the rotating electrical machine (10).   7. A method according to any one of the preceding claims, characterized in that the rotational speed (Wmel_mes) of the rotor is measured by Hall effect analog sensors (H1, H2, H3).   A control module comprising a memory for storing software instructions for performing the method according to claim 1.   9. A programmable logic circuit or an integrated circuit configured to implement a method for estimating a direct current generated by the rotating electrical machine according to any one of claims 1 to 8. A control module (14) for a rotating electrical machine.