摘要:
A method carried out in an alternator supplying a supply voltage slaved to a nominal value by means of a control loop controlling an excitation current of the alternator via a pulse width modulation of the current. The method limits the power draw by the alternator from the heat engine of the vehicle in a progressive response phase (LRC_Ph) with a higher supply voltage drop to a pre-determined triggering threshold by only authorizing progressive increases of a current cyclic ratio (DC_EXC) of the excitation current from an initial cyclic ratio (DC_I) to an expected cyclic ratio calculated by the control loop. According to the invention, at the beginning of the progressive response phase, the initial cyclic ratio is increased by a pre-determined jump only if the regulation loop does not have an acyclism.
摘要:
A method is disclosed to produce a supply voltage (B+) in an on-board system of a vehicle in response to an excitation current (I_ROTOR) applied to a rotor of the alternator. The method is of the type that consists in: limiting the resisting torque by determining a maximum cyclic ratio (DC_C_LIMIT) of the excitation current as a function of variables taken from a group containing a rotational speed (V_ROTOR) of the rotor, a temperature of the rotor, the excitation current and the supply voltage (B+). The maximum cyclic ratio is determined as a function of at least two of the variables in the group. According to one specific embodiment, the variables are rotational speed and temperature. According to another embodiment, the variables are rotational speed and excitation current.
摘要:
A regulator has a circuit generating an activation command by bringing, to a first voltage higher than a high reference voltage, a bidirectional line connected to a detection circuit for detecting a status of the activation command. The detection circuit comprises generation means for generating a fault signal from a flag indicating a failure of the alternator, linking the line to a ground by means of a switching element, thus bringing the line to a second voltage lower than a fault voltage lower than the high reference voltage, and the control circuit comprises detection means for detecting the fault signal. The control circuit further transmits a setpoint PWM signal having a maximum higher than the high reference voltage and a minimum lower than a low reference voltage higher than the fault voltage, a duty ratio of the setpoint signal being representative of a setpoint voltage (V0) of the regulator.
摘要:
The invention relates to a voltage regulator (43) for a motor vehicle alternator (44). The device comprises a control module (I) for controlling an excitation current (lexc) in an excitation winding (3) of the alternator (44) according to a difference (5) between a setpoint voltage (DO) and a control voltage (Dbat) of an on-board network (9). The on-board network (9) of the vehicle is powered by a battery (10) to which the alternator (44) is connected. According to the invention, the voltage regulator (43) further comprises a safety module (30) that monitors the control voltage (Ubat) and which is separate from the control module (I). In a particular embodiment, the control module (I) and the safety module (30) are connected electrically by external bonding interconnections.
摘要:
The invention relates to a control loop (10) which is installed in a voltage regulator of a motor vehicle alternator and controls an output voltage of the latter by adjusting an excitation current of the alternator. The control loop includes, at the input, means for measuring (31) the output voltage by sampling, generating a measurement signal (Um), error-calculation means (13) generating an error signal (e) equal to a difference between the measurement signal (Um) and a set value (Uo), means for processing the error signal (e) including an amplifier (14) and generating a control signal (Ysat) and, at the output, means (35) for generating a control signal (PWM) controlling excitation control means in accordance with the control signal (Ysat). According to the invention, the processing means also include a phase-advance filter (24).
摘要:
System (17) for managing a supply voltage (B+A) of an onboard electrical network of a motor vehicle comprises a device (2, 4, 9, 16) for regulating the supply voltage and a device (10, 11) for protecting the onboard electrical network against overvoltages, the two devices together controlling an excitation of an alternator supplying the onboard electrical network. According to the invention, the protection device is separate from the regulating device. An overvoltage signal (OVD) generated by the protection device (11) and controlling the excitation has priority over an excitation signal (EXC) generated by the regulating device. The regulating device and the protection device can be in the form of two separate electronic blocks on separate substrates.
摘要:
The invention relates to a device for controlling an alternator of the type that controls a DC voltage (B+A) generated by the alternator (11) according to a predetermined set voltage (U0) by monitoring the intensity of an energizing current (IEXC) flowing through an energizing circuit of the alternator. According to the invention, the device includes a voltage-control loop (7) and a temperature-control loop (17) which comprises a temperature sensor supplying a current temperature (T) of components of the alternator, a subtracter (19) supplying a temperature error (ϵt) between the current temperature (T) and a maximum acceptable temperature (Tmax) and a control module (20) supplying a maximum admissible energizing percentage (rmax) in accordance with the temperature error according to a predetermined control law.
摘要:
A method for controlling a motor vehicle alternator, in which an error value, resulting from the comparison between the voltage produced by the alternator and a set value, is processed in a filtering means by applying a transfer function, which determines a gain to be associated with the error value on the basis of the rotational frequency of the alternator, in order to control the adjustment of the field current allowed by the alternator. The transfer function of the filtering means is modified on the basis of the rotational speed of the alternator by attenuating the gain over a given frequency range when the rotational speed decreases.
摘要:
The regulating device (5) according to the invention for an excitation alternator (9) comprises a voltage feedback loop (6) and a temperature feedback loop (15) comprising means for measuring/estimating temperature supplying a current temperature (T), a comparator (18) generating a temperature error (εT) between a maximum permissible temperature (Tmax) and the current temperature, means for inputting a current speed of rotation of the alternator, a control module (19) supplying a percentage of a maximum permissible excitation (rmax) as a function of the temperature error and a speed correction supplied by speed correction means according to a predetermined correction law as a function of the current rotation speed.
摘要:
The method of control according to the invention slaves a DC voltage generated by the alternator to a predetermined setpoint value by controlling an excitation current flowing in an excitation circuit comprising an excitation winding of a rotor of the alternator. The excitation current is controlled by means of a semiconductor switch, in turn controlled by a control signal having a predetermined period. The method comprises a detection of a failure of the excitation circuit. At least one short-circuit of the excitation winding is detected. According to another characteristic of the method, the control signal is generated on the basis of a combination of a setpoint signal formed by pulses of the predetermined period exhibiting a duty ratio representative of the setpoint value and of a detection signal indicative of the short-circuit.