JPH11308899A - Controller for exciter type retarder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide adequate braking stop distance, by introducing a structure to generate the predetermined braking torque on an exciter type retarder when it is operated with the footing speed or footing pressure higher than the predetermined speed and pressure. SOLUTION: This braking apparatus is loaded with a pedal footing condition detecting apparatus E1 at the lower part of a vehicle and it is connected to a microcomputer 21 for retarder control via a second retarder input switch S4 provided at the driver's sheet. When the brake pedal is operated with the footing speed or footing pressure higher than the predetermined speed and pressure, a drum brake loaded to each wheel is operated and a retarder input signal is impressed to the microcomputer 21 via the second retarder input switch S4 from the pedal footing condition detecting apparatus E1 . An ON-OFF port signal is outputted from the port P of the microcomputer 21 to generate the predetermined braking torque to the exciter type retarder. As a result, appropriate braking stop distance can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for an exciter type retarder, and more particularly, to a retarder with a built-in exciter having a configuration in which the braking torque of the retarder is controlled by conduction control (phase control) of a thyristor. The present invention relates to an exciter type retarder control device configured to detect a stepping state and generate a thyristor trigger signal.

[0002]

2. Description of the Related Art A built-in exciter type retarder has a U-shaped outer peripheral portion of a drum 101 as shown in a longitudinal sectional view of a main part of the retarder of FIG. 3 and a transverse sectional view of FIG. An anchor plate 103 having a groove 102 made of a formed member and having a tip inserted into the groove 102 is provided, and a magnetic pole is provided on one side of the tip of the anchor plate 103 entering the groove 102. 10
4 and a field coil 105 are provided.
The exciter coil 106 is disposed on the opposite side of the exciter coil 4. A magnet 107 is provided in the groove 102 at a position facing the exciter coil 106 via a gap, and when the drum 101 rotates, the exciter coil 10
6, a voltage is generated. Cooling fins 108 are attached to the outer peripheral edge of the drum 101.
Then, the voltage induced in the exciter coil 106 is rectified, a current flows through the field coil 105, a magnetic flux is generated in the magnetic pole 104, and an eddy current is generated in the drum 101.

A conventional exciter type retarder control device for controlling the retarding torque of the retarder by controlling the phase of the thyristor has a configuration as shown in FIG.
In the figure, an AC voltage generated by an exciter 1 (corresponding to the exciter coil 106 in FIGS. 3 and 4) is converted into a DC voltage by a thyristor rectifier circuit 3 (hereinafter, referred to as a thyristor control mixed bridge rectifier circuit) in the power supply circuit 2. And
This DC voltage is supplied to the retarder 4. The retarder field winding 5 of the retarder 4 (the field coil 105 of FIGS. 3 and 4)
), The exciter 1
An eddy current is generated in an eddy current cylindrical drum 6 (corresponding to the drum 101 in FIGS. 3 and 4) rotating with the rotor of FIG. A force in the direction opposite to the direction of rotation of the drum 6, ie, a braking torque, is generated, which exerts a braking effect on the rotational movement of the eddy current cylindrical drum 6. Therefore, if the eddy current cylindrical drum 6 is attached to, for example, an engine crankshaft, it functions as a brake.

The braking torque is controlled by the conduction timing of the thyristors 7 and 8 in the thyristor control mixing bridge of the two thyristors 7 and 8 and the diodes 24 and 25, which constitute the rectifier circuit 3. The conduction timing of the thyristors 7 and 8 is determined based on the synchronous signal obtained from the synchronous signal generating circuit 9 by extracting the AC voltage of the exciter 1 and the gate signal is transmitted through the control system circuit 10 to the pulse transformer 1
1, 12 are determined.

The control system circuit 10 is supplied with the voltage of, for example, a 24V system battery 13 mounted on a vehicle whose body is negatively grounded, and supplies the voltage to an IC such as a microcomputer based on the voltage.
A V-system DC voltage is generated.
The V DC voltage is also grounded.

The resistors 14 and 15 in the power supply circuit, the insulating transformer 16 and the diode 30 for performing half-wave rectification, etc.
A feedback voltage detection circuit 31 for the field current flowing through the retarder field winding 5 is configured.
Is rectified by a diode 30 that performs half-wave rectification, and is input to the control system circuit 10 as a feedback detection signal.

When an abnormal current flows through the retarder field winding 5 such that the thyristors 7 and 8 of the thyristor mixing bridge are undesirably destroyed and become conductive, the protection relay 2
9 is energized, the contact 29-1 is closed, and the rectifier circuit 3
Both ends of the positive electrode and the negative electrode are short-circuited, and the fuse 17 is blown to protect the system.

FIG. 6 shows a configuration diagram of a thyristor gate drive circuit in a conventional control system circuit. In the figure, the zero-cross point of the synchronization signal synchronized with the AC voltage of the exciter 1 obtained from the synchronization signal generation circuit 9 is detected by the zero-cross detection circuit 18. The zero-cross detection circuit 18 triggers the one-shot multivibrator 19 at the timing of the zero-cross point detection, and generates a pulse of a predetermined width synchronized with the zero-cross point of the AC voltage of the exciter 1 from the one-shot multivibrator 19.

That is, the microcomputer 21 is connected to a vehicle body (see FIG. 1).
(Not shown) dedicated vehicle speed sensor S ₁Speed obtained from
Signal, temperature sensor S provided on retarder field winding_TwoOr
The obtained retarder field winding temperature signal, the driver's seat of the car
Retarder switch S provided at_ThreeMore retarder
Detected by signal and feedback voltage detection circuit 31
Based on the detected feedback voltage detection signal.
Retarder field winding temperature indicating presence or absence of normal temperature and retarder operation
Time and feedback voltage detection signal as variables
Refers to the table to be indexed, and
The on / off port signal with the desired pulse width
From port P of capacitor 21 to pulse transformers 11 and 12
Output. The output of thyristors 7 and 8 is
Communication control is performed.

In controlling the thyristors 7 and 8, the applicant has proposed a gate driving method using photothyristors 27 and 28 as shown in FIG. 7 instead of the pulse transformers 11 and 12 shown in FIG. Japanese patent application Hei 8-2607
No. 41). That is, in FIG. 7, the same components as those in FIG.
The on / off port signal output from the port P of the microcomputer 21 shown in FIG. That is, the on / off port signal determines the conduction timing of the thyristor 7 (or 8) described with reference to FIG. The thyristor 7 (or 8) controls the retarder field winding 5
Is controlled, and accordingly, the braking torque generated in the retarder 4 is controlled. Incidentally, reference numeral 23 in the microcomputer 21 is an internal timer, and the on / off port signal is generated by interrupt processing using the internal timer 23.

FIG. 8 is an explanatory diagram of a thyristor driving waveform in a conventional case. [1] in FIG. 8 is the output of the exciter 1, and FIG.
[2] indicates the synchronizing signal of the synchronizing signal generation circuit 9 and [3] in FIG. 8 indicates the output of the one-shot multivibrator 19, respectively.

If the on / off port signal output from the microcomputer 21 of the control circuit 10 is [6] in FIG.
This on / off port signal is input to the photothyristors 27 and 28 shown in FIG. In this case, the rectifier circuit 3 of the thyristor controlled mixed bridge is turned off during the shaded area shown in [7] of FIG. When reducing the voltage applied to the retarder field winding 5, the on / off port signal is
[4], the rectifier circuit 3 of the thyristor control mixing bridge conducts as shown in FIG. 8 [5], and when the voltage applied to the retarder field winding 5 increases, The on / off port signal is as shown in [8] of FIG. 8, and the rectifier circuit 3 of the thyristor controlled mixed bridge is
of

Conduction occurs as in [9]. That is, the waveform portions (hatched portions) indicated by the dotted lines become the DC control voltages of the thinned waveforms, and the field current by the DC control voltages flows through the retarder field winding 5 shown in FIG.

Thus, the exciter type retarder controlled as described above is mounted on a propeller shaft or the like that transmits the engine torque of the vehicle to the wheels. When the vehicle continues to step on the driver's brake pedal when traveling down a long hill, the brake lining attached to the brake shoe of the drum brake that operates when the brake pedal is depressed burns due to frictional heat and breaks. It is used to prevent it.

[0014] That is, the time the vehicle is descending a long hill driver without depressing the brake pedal, by closing the retarder start switch S ₃ provided in the driver's seat, actuating the exciter scheme retarder. In this case, since the driver has naturally stopped depressing the accelerator, the engine brake (or the exhaust brake) is also operated. Therefore, this exciter type retarder operates as an auxiliary brake that compensates for the shortage of the engine brake (or the exhaust brake).

[0015]

However, the present invention is not limited to this. For example, recently, as a driver of an automobile, a driver (for example, a female or Elderly people) are increasing. Drivers with a weak force to depress the brake petal have a long braking stop distance from when the brake petal of the vehicle starts to depress until the vehicle completely stops because the force to depress the brake petal in an emergency is weak. There was a problem with safe driving.

The present invention has been made in view of the above points, and has a depressed state detecting device for detecting the depressing speed or pressure of a petal corresponding to a brake petal provided in a driver's seat. When the vehicle is operated at a stepping speed or a predetermined stepping pressure or higher, a predetermined braking torque is generated in the exciter-type retarder so that even if the driver has a weak force to depress the brake petal, the vehicle is completely driven. An object of the present invention is to make it possible to make the braking stop distance before stopping to be equal to that of a general male, thereby improving the running safety of the vehicle.

[0017]

According to the present invention, an AC voltage of a built-in exciter is rectified by a thyristor control rectifier circuit to supply power to a retarder field winding, a vehicle speed signal from a vehicle speed measuring means, a retarder operating time and On the basis of the detection voltage of the retarder field winding, a trigger signal is generated for the thyristor, and the thyristor is controlled to conduct, thereby controlling the power supply current and controlling the braking torque generated in the retarder. In the control device of the exciter type retarder, a depression state detecting device for detecting a pedal depression speed or pressure is provided corresponding to a brake pedal provided in a driver's seat, and the brake pedal is set to a predetermined depression speed or a predetermined depression pressure or more. Characterized in that when actuated, the retarder is configured to generate a predetermined braking torque. That.

[0018]

Figure 1 DETAILED DESCRIPTION OF THE INVENTION is an example block diagram of a brake pedal of the foot-used in the control apparatus of the present invention exciter scheme retarder, A in the figure is the driver's foot, B ₁ is a brake pedal, The petal B ₁ is mounted to be rotatable about an axis B ₄ of a fixing bracket B ₃ fixed to the vehicle body B ₂ . Incidentally, B ₅ is a return spring mounted between the petals B ₁ and the vehicle body B _2. The S ₄ is a second retarder start switch.

Next, C ₁ is a master cylinder containing oil, which is mounted on the vehicle body B ₂ as shown in the figure. C ₂
One end in the piston is engaged attached to the brake pedal B _1, the other end is attached to the master cylinder C ₁ to loosely fitted state. C ₃ is an oil pipe.
₃ is connected to a drum type brake (or a disk type brake) provided on each wheel of the automobile.

Next, D₁Is the drum type brake,
This drum type brake D₁Each on each wheel of the car
This indicates one of the components that are
Is the rotating drum D_TwoAnd this drum D_TwoInstalled inside
Two brake shoes D _ThreeAnd these two brakes
Shoe D_ThreeReturn spring D attached to_FourAnd the said
Oil Pive C_ThreeCylinder D connected to_FiveWhen,
This wheel cylinder D_FiveMounted in a mating state inside
And one end of the brake shoe D_Three2 pieces attached to
Piston D₆And more.

[0021] Therefore, keep on the second retarder start switch S ₄ of the. When the driver depresses the brake pedal B ₁ foot A, increased oil pressure oil in the master cylinder C ₁ is pressed by the piston C _2, the wheels of the wheel cylinder D the oil pressure through the oil pipe C ₃ transmitted to _5, thereby projecting two pistons D ₆ which is in the wheel cylinder D ₅ is pushed to the right and left spread laterally brake shoe D _3, brake lining mounted on the outer periphery of the brake shoe D ₃ ( not shown) is pressed against the brake drum D ₂ occurs friction, rotation of the for the wheel is finally decelerated to stop.

[0022] Thus, petals depression state detecting device E ₁ in the lower portion of the vehicle body B ₂ equipped with the master cylinder C ₁ is mounted in the FIG. Then, E ₂ in the plunger of the state detecting device E _1, the end of the plunger E ₂ is engaged mounted in the same way brake pedal B ₁ and piston C _2, the other end petals depression state detecting device E ₁ is attached in a play state.

Then, the petal depression state detecting device E ₁
Is connected to the microcomputer 21 for retarder control as shown through the second retarder start switch S ₄ provided in the driver's seat as shown in FIG. In FIG. 2, the same components as those in FIG. 6 of the conventional example are denoted by the same reference numerals, and perform the same operations as in the conventional example. Incidentally, petals depression state detecting device E ₁ is not limited as long as the detecting may be designed to detect the speed at which depresses the pedal, also depressed during depression pressure (pressure stepping shocking).

In the case of a driver (for example, a woman or an elderly person) who has a lower force on the brake pedal than a general male driver of the automobile, the second retarder switch S _4.
If the vehicle is closed, an emergency occurs while driving the car (when you want to slow down or stop the car as soon as possible)
The, even when the force depressing thereof brake pedal B ₁ is weaker than general men, if depresses the brake pedal B ₁ shocking, i.e. the brake pedal B ₁ a predetermined depression speed or a predetermined depression pressure in a case where it is operated in the above, the actuating the drum brake D ₁ mounted to the each wheel, than the petal depression state detecting device E _1, through the second retarder start switch S _4, 2 A retarder input signal is applied to the microcomputer 21 shown in FIG.
An on / off port signal is output from the exciter-type retarder, so that a predetermined braking torque can be generated.

Therefore, even if the driver has a weak force to depress the brake pedal, the braking stop distance until the vehicle completely stops can be made equal to that of a general male.

[0026]

As is apparent from the above description, according to the present invention, a petal depression state detecting device is provided corresponding to the brake petal provided in the driver's seat, and the brake pedal is depressed at a predetermined depression speed or a predetermined depression speed. When the brake pedal is operated at a pressure higher than the depressing pressure, a predetermined braking torque is generated in the exciter type retarder. It can be made equivalent to the case of a man, so that the driving safety of the car can be significantly improved.

[Brief description of the drawings]

FIG. 1 is a configuration diagram of an embodiment of a foot-operated brake petal used in a control device of an exciter type retarder according to the present invention.

FIG. 2 is a configuration diagram of an embodiment of a thyristor gate drive circuit that forms a part of the control device of the exciter type retarder according to the present invention.

FIG. 3 is a longitudinal sectional configuration view of a main part of a built-in exciter type retarder.

FIG. 4 is a cross-sectional configuration diagram of a main part of a built-in exciter type retarder.

FIG. 5 is a configuration diagram of an embodiment of a control device of an exciter type retarder.

FIG. 6 is a configuration diagram of a conventional thyristor gate drive circuit.

FIG. 7 is a configuration diagram of a conventional thyristor gate drive circuit.

FIG. 8 is an explanatory diagram of a thyristor driving waveform in a conventional case.

[Explanation of symbols]

A Driver's foot B ₁ Brake petal C ₁ Master cylinder C ₂ Piston C ₃ Oil pipe D ₁ Drum type brake D ₂ Drum D ₃ Brake shoe E ₁ Petal depression state detection device 1 Exciter 2 Power supply circuit 3 Rectifier circuit 4 Retarder 5 Retarder field winding 7, 8 Thyristor 9 Synchronous signal generation circuit 10 Control system circuit 13 Battery 16 Insulation transformer 18 Zero cross detection circuit 21 Microcomputer 24, 25, 30 Diode 31 Feedback voltage detection circuit

Claims (1)

[Claims] An AC voltage of a built-in exciter is rectified by a thyristor control rectifier circuit to supply power to a retarder field winding, a vehicle speed signal from a vehicle speed measuring means, a retarder operation time, and a detection voltage of the retarder field winding. Based on the above, by generating a trigger signal for the thyristor, by controlling the conduction of the thyristor, to control the power supply current, in the control device of the exciter type retarder of the configuration that controls the braking torque generated in the retarder, A depressed state detecting device for detecting a petal depressing speed or pressure corresponding to a brake petal provided in a driver seat is provided, and when the brake petal is operated at a predetermined depressing speed or a predetermined depressing pressure or more, the retarder Control system for an exciter type retarder, characterized in that a predetermined braking torque is generated in the vehicle. Control device.