JP3385129B2 - Exciter built-in retarder - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a retarder with a built-in exciter, and more particularly, to a retarder with a built-in exciter in which the braking torque of the retarder is controlled at the conduction timing of a thyristor. The present invention relates to a retarder with a built-in exciter, which is electrically isolated from a vehicle battery system.

[0002]

2. Description of the Related Art Conventionally, a retarder with a built-in exciter that controls the braking torque of the retarder at the conduction timing of the thyristor has the structure shown in FIG.

In the figure, the AC voltage generated in the exciter 1 is converted into a DC voltage by the rectifier circuit 3 of the thyristor control mixing bridge in the power supply circuit 2, and this DC voltage is supplied to the retarder 4. When a field current flows in the retarder field winding 5 of the retarder 4, an eddy current is generated in the eddy current cylinder 6 that rotates together with the rotor of the exciter 1, and the eddy current and the magnetic field generated by the retarder field winding 5 are generated. Between them, an electromagnetic force, that is, a braking torque, is generated in a direction opposite to the rotation direction of the vortex cylinder 6, which exerts a braking action on the rotational movement of the vortex cylinder 6. Therefore, if the swirl cylinder 6 is attached to, for example, the crankshaft, it will act as a brake.

This braking torque is controlled by the conduction timing of the thyristors 7 and 8 of the thyristor control mixing bridge which constitutes the rectifier circuit 3.
The conduction timing of 8 is based on the synchronization signal obtained from the synchronization signal generation circuit 9 by extracting the AC voltage of the exciter 1, and the timing signal generated by the gate signal generation circuit described in FIG. It is defined by being applied to 11 and 12.

The control system circuit 10 is supplied with the voltage of, for example, a 24V battery 13 mounted on a vehicle whose negative side is body-grounded, and based on this, generates a 5V DC voltage to be supplied to an IC such as a microcomputer. The 5V DC voltage is also grounded.

The resistors 14 and 15 in the power supply circuit 2 constitute a feedback voltage detection circuit for the field current flowing through the retarder field winding 5. Also, the thyristor 16
When the thyristors 7 and 8 of the thyristor-controlled mixing bridge are destroyed and brought into conduction, the thyristor 16 is turned on to forcibly short-circuit, and the fuse 17 is blown to protect the retarder with a built-in exciter. There is something.

FIG. 6 shows a conventional gate signal generation circuit diagram. In the figure, the zero-cross detection circuit 18 detects the zero-cross point of the synchronizing signal waveform synchronized with the AC voltage of the exciter 1 obtained from the synchronizing signal generating circuit 9. The zero-cross detection circuit 18 triggers the one-shot multivibrator 19 at the timing of detecting the zero-cross point, and causes the one-shot multivibrator 19 to generate a pulse having a predetermined width in synchronization with the zero-cross point of the AC voltage of the exciter 1. This pulse is input to the AND gate 20 in the next stage.

On the other hand, the microcomputer 21 controls the vehicle speed signal, the retarder field winding temperature signal, the retarder closing signal and the resistance 1 signal.
Based on the feedback detection signal detected by the feedback voltage detection circuits 4 and 15, the three-dimensional table of the vehicle speed, the retarder field winding temperature, and the retarder operating time is referred to and obtained from the three-dimensional table. Reference voltage value Vref
And the detection voltage Vb of the feedback detection signal are compared. An on / off port signal of ON (H signal) if Vb ≦ Vref and OFF (L signal) if Vb> Vref is output from the port P of the microcomputer 21.

This on / off port signal is input to the AND gate 20, and its output is applied to the pulse transformer 11 (or 12) of FIG. The pulse transformer 11 (or 12) generates a gate trigger signal that makes the thyristor 7 (or 8) conductive. That is, the conduction timing of the thyristor 7 (or 8) described in FIG. 5 is determined. The field current flowing through the retarder field winding 5 is controlled by the conduction timing of the thyristor 7 (or 8), and thus the braking torque generated in the retarder 4 is controlled. The microcomputer 21
Reference numeral 23 is an internal timer, and the on / off port signal is generated by interrupt processing using the internal timer 23.

[0010]

However, as shown in FIG.
In the conventional retarder with built-in exciter shown in FIG. 6, the negative side of the power supply system such as the power supply circuit 2 and the synchronization signal generation circuit 9 is grounded, and the vehicle that supplies power to the control system circuit 10 is connected to the vehicle. Since the negative side of the vehicle battery 13 is grounded to the body, the vehicle battery 13 is grounded in common with the vehicle battery 13, the AC voltage generated in the exciter 1 is high, and the insulation process of the control system circuit 10 is not strengthened. However, there is a drawback that reliability is lost due to secular change of the insulation treatment. Therefore, it is desired that the power supply system including the exciter 1 and the vehicle battery system are completely insulated and separated.

An object of the present invention is to solve the above-mentioned drawbacks. The power supply system has a circuit configuration which does not ground, so that the power supply system and the vehicle battery system are completely insulated and separated from each other. The control of the thyristor generated from the circuit configuration that does not reduce the cost is changed to another system, the cost is low without using an expensive isolation amplifier, and the power supply system and the battery system for the vehicle are completely separated. It is intended to provide a built-in retarder.

[0012]

In order to solve the above-mentioned problems, the retarder with built-in exciter according to the present invention has an exciter built-in, and rectifies an AC voltage generated in the exciter into a DC voltage by a rectifier circuit of a thyristor control mixing bridge. In a retarder with a built-in exciter that supplies power to the retarder with
The first insulating means for insulating the ground side of the power supply circuit for flowing the field current in the retarder field winding of the retarder and the ground side of the synchronous signal generating circuit for controlling the thyristor of the thyristor control mixing bridge are connected. Second insulating means for insulation and a control pattern generation circuit for generating a control pattern of the thyristor for controlling the field current based on the vehicle speed signal, the retarder field winding temperature signal and the retarder closing signal are provided. It is characterized in that the ground side of the power supply system is insulated from the ground of the vehicle battery to the control system circuit for controlling the conduction timing of the thyristor by the first and second insulating means.

The control pattern generating circuit has a control pattern memory in which the retarder field winding temperature, the vehicle speed, and the retarder operating time are used as elements, and the conduction timing control pattern of the thyristor is stored in advance as data.

[0014]

The first insulating means for insulating the ground side of the power supply circuit for flowing the field current through the retarder field winding of the retarder, and the synchronization signal generating circuit for controlling the thyristor of the thyristor control mixing bridge. Second to insulate the ground side
With the insulating means, the negative side of the power supply system is floated from the ground side of the vehicle battery, and the power supply system circuit section and the vehicle battery are separated. At that time, the conduction control of the thyristor of the thyristor controlled mixing bridge is based on the current sensorless constant current control method based on the voltage control which allows for the temperature rise of the retarder field winding due to the feedforward of the zero-cross on-off pattern output of the thyristor.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the configuration of an embodiment of a retarder with an exciter according to the present invention. In the figure, the same parts as those in FIG. 5 are designated by the same reference numerals.

In the power supply circuit 2, a first insulation circuit 25 is connected to both ends of the rectifier circuit 3 in order to float the negative side of the power supply circuit 2 from the ground, and a photocoupler 26 separates it from the ground side of the vehicle battery 13. I am trying. That is, instead of the feedback detection signal detected by the feedback voltage detection circuit for detecting the field current flowing through the retarder field winding 5, the resistors 14 and 15 shown in FIG. 5 are replaced by the light emitting diode of the photocoupler 26 and the control system. The presence or absence of a field current flowing in the retarder field winding 5 is detected by separating the photocoupler 26 of the pair shown in the circuit 10 from the light receiving transistor, and if an undesired field current flows, a thyristor is detected. The signal is used for short-circuiting the thyristor 16 when it is determined that the failure has occurred in Nos. 7 and 8. Further, since the negative side is floated from the ground, the gate trigger of the protective thyristor 16 is performed via the pulse transformer 27.

In the sync signal generating circuit 9, a second insulating circuit 28 is connected to float the negative side of the sync signal from the ground, and a photocoupler 29 separates the negative side from the ground side of the vehicle battery 13. That is, the synchronization signal generation circuit 9
The full-wave DC rectified by the rectifier circuit of
Applied to the light-emitting diode of the control system circuit 10 to obtain a synchronizing signal waveform synchronized with the AC voltage of the exciter 1 from the light receiving transistor of the pair of photocouplers 29 depicted in the control system circuit 10, and to the ground side of the vehicle battery 13. I try to separate them.

As described above, the photocoupler 26 of the first insulating circuit 25 and the photocoupler 29 of the second insulating circuit 28 are configured to be completely separated from the vehicle-grounded vehicle battery 13, but the sync signal The second insulating circuit 28 on the generating circuit 9 side may be separated by using a transformer. In some cases, a transformer can also be used for the first insulating circuit 25.

The control system circuit 10 includes a thyristor 7,
Control pattern generation circuit 3 for controlling the conduction timing of 8
0 is provided, and based on the pulse signal generated from the ON / OFF pattern data stored in the control pattern generation circuit 30 described below and the synchronization signal from the synchronization signal generation circuit 9, the thyristor 7, A gate signal generation circuit for generating a signal for controlling the conduction timing of 8 is provided.

FIG. 2 shows the configuration of an embodiment of the gate signal generation circuit used in the present invention. The microcomputer 21 shown in the figure conducts an experiment in advance on the vehicle speed, the retarder field winding temperature, and the retarder activation time based on the three-dimensional signal of the vehicle speed signal, the retarder field winding temperature signal, and the retarder input signal. The control pattern memory 3 that stores the data for the combinations of these respective signals obtained as described above as shown in FIG.
Equipped with 1. Based on the combination of the input vehicle speed signal, retarder field winding temperature signal, and retarder input signal, the microcomputer 21 accesses the control pattern memory 31 shown in FIG. The ON / OFF pattern data for the feed-forward control, which is related to the combination of the ON and OFF times, is read out. Then, the microcomputer 21 generates a corresponding pulse signal sequence from the combination of the on time and the off time of the on / off pattern data, and outputs the pulse signal sequence from the port P thereof. This pulse signal train is input to the AND gate 20.

On the other hand, the zero crossing point of the synchronizing signal waveform synchronized with the AC voltage of the exciter 1 obtained from the synchronizing signal generating circuit 9 via the second insulating circuit 28 is detected by the zero crossing detecting circuit 18, and the zero crossing point is detected. At this timing, the one-shot multivibrator 19 is triggered to generate a pulse synchronized with the zero-cross point of the AC voltage of the exciter 1 from the one-shot multivibrator 19. This pulse is input to the AND gate 20 in the next stage.

The AND gate 20 ANDs both of the above pulses, and the output is applied to the pulse transformer 11 (or 12) of FIG. The pulse transformer 11 (or 12) generates a gate trigger that makes the thyristor 7 (or 8) conductive. That is, the conduction timing of the thyristor 7 (or 8) described in FIG. 5 is determined. The field current flowing through the retarder field winding 5 is controlled by the conduction of the thyristor 7 (or 8), and the braking torque generated in the retarder 4 is controlled.

For example, one of the operations will be described as an example together with the operation waveform diagram of FIG. In the microcomputer 21, for example, the retarder field winding temperature signal is θs (θ1 <θs <θ2),
When the vehicle speed signal is Vs (V1 <Vs <V2) and each signal with the operation time of the retarder input signal is t2, the microcomputer 21 controls the control pattern memory 31 based on these three elements.
Is accessed and the on / off pattern data of the combination of the on time Tx and the off time Ty is read from the control pattern memory 31. Then, the microcomputer 21 uses the internal timer 23 to generate a pulse signal sequence relating to the combination of the on time Tx and the off time Ty of the on / off pattern data, outputs the pulse signal from the port P, and inputs the pulse signal to the AND gate 20. (Fig. 3).

On the other hand, as described above, the second insulating circuit 28
The zero crossing point of the synchronizing signal waveform (in FIG. 3) synchronized with the AC voltage of the exciter 1 obtained from the synchronizing signal generation circuit 9 via the
Based on this, the one-shot multivibrator 19 inputs a pulse of a predetermined width (in FIG. 3) synchronized with the zero cross point of the AC voltage of the exciter 1 to the AND gate 20. At this time, even if the pulse A from the one-shot multivibrator 19 is input during the off time Ty of the pulse signal input from the port P of the microcomputer 21, the AND gate 20 is a pulse for making the thyristor 7 (or 8) conductive. Is not output (FIG. 3), the AC voltage of the exciter 1 at that timing is not rectified by the rectifier circuit 3 and its half wave is thinned out (hatched portion in FIG. 3). That is, by thinning out the half waves, the field current flowing through the retarder field winding 5 is controlled in a decreasing direction.

In this manner, the microcomputer 21 relates to the combination of the on-time and the off-time of the on-off pattern data based on the three-dimensional signals of the vehicle speed signal, the retarder field winding temperature signal and the retarder input signal which are input. A pulse signal train is output from the port P, and the conduction timing of the thyristor 7 or 8 is controlled by the feedforward method so that the optimum torque of the retarder 4 according to the control condition at that time is generated.

[0026]

As described above, according to the present invention, the exciter system for generating a high voltage, that is, the earth side of the power supply circuit system and the earth side of the battery system for a vehicle having a low voltage are completely insulated and separated. be able to. Therefore, the occurrence of electrolytic corrosion in the vehicle system due to common grounding is reduced, and its reliability is greatly improved.

Further, in separating the ground, the feedback voltage control method for detecting the feedback voltage of the retarder field winding is abolished, and the voltage control in which the temperature rise of the retarder field winding is expected by the feedforward of the zero-cross on-off pattern output of the thyristor. Since the current sensorless constant current control system based on is configured to separate and insulate the power supply system and the vehicle battery system, inexpensive components such as a photocoupler and a transformer can be used.

At this time, since the microcomputer has one input element reduced, there is an advantage that the reliability of the retarder control becomes high.

[Brief description of drawings]

FIG. 1 is a configuration of an embodiment of a retarder with an exciter according to the present invention.

FIG. 2 is a configuration of an embodiment of a gate signal generation circuit used in the present invention.

FIG. 3 is an operation waveform diagram.

FIG. 4 is an explanatory diagram of a storage status of an embodiment of a control pattern memory.

FIG. 5 is a configuration diagram of a conventional retarder with an exciter.

FIG. 6 is a conventional gate signal generation circuit diagram.

[Explanation of symbols]

1 Exciter 2 power supply circuit 3 rectifier circuit 4 retarders 5 retarder field winding 7,8 Thyristor 9 Synchronous signal generation circuit 10 Control system circuit 13 battery 25 First insulation circuit 28 Second insulation circuit 30 control pattern generator 31 Control pattern memory

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP-A-8-126399 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) H02P 15/00

Claims (2)

(57) [Claims] 1. A retarder with a built-in exciter, in which an AC voltage generated in the exciter is rectified to a DC voltage by a rectifier circuit of a thyristor-controlled mixing bridge to supply power to the retarder, the retarder field winding of the retarder is provided. First insulating means for insulating the ground side of the power supply circuit for flowing the field current, and second insulating means for insulating the ground side of the synchronous signal generating circuit for controlling the thyristor of the thyristor control mixing bridge A control pattern generating circuit for generating a control pattern of the thyristor for controlling the field current based on the vehicle speed signal, the retarder field winding temperature signal and the retarder closing signal,
The ground side of the power supply system is connected by the first and second insulating means,
A retarder with a built-in exciter, which is configured to be insulated from the ground of a vehicle battery to a control system circuit that controls the conduction timing of the thyristor. 2. The control pattern generating circuit comprises a control pattern memory in which a retarder field winding temperature, a vehicle speed, and a retarder operating time are used as elements, and a thyristor conduction timing control pattern is stored in advance as data. The retarder with a built-in exciter according to claim 1.