JPS5875465A - Controller for cooling of retarder - Google Patents

Abstract

PURPOSE:To prevent the waste of energy, and to obviate the lowering of the damping force of the retarder by mounting a temperature sensing element electrically detecting the heat-generating temperature of a retarder unit and a means controlling the flow rate of a regrigerant in response to the heat-generating temperture to the retarder unit. CONSTITUTION:The output of the temperature sensing element 14 is connected as the comparison input of a comparison circuit 36, the predetermined temperatue of an iron core 10 is converted into voltage and given as the refernce input of the circuit, and the comparison output of the comparison circuit 36 is connected to the control input of a control circuit 37. The control output of the control circuit 37 is connected to the control input of a control valve 33. When the temperature of the iron core 10 exceeds the pedetermined temperature, comparison output is transmitted from the comparison circuit 36, the switch 37a of the control circuit 37 is at ON to open the control valve 33, cooling water is sent into an inflow pipe through a retarder cooling pipe 32, and a conductive pipe 16 is cooled. Accordingly, a cooling device is operated only when the retarder must be cooled, and the waste of energy can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a cooling control device for an electromagnetic retarder, which is a deceleration brake for a vehicle.

The present applicant has invented a new electromagnetic retarder as a vehicle deceleration brake, and has filed a patent application filed at the same time as this application.

In this electromagnetic retarder, the retarder rotor is a flywheel that is attached to the crankshaft connecting the engine and the transmission, and the excitation coil and short-circuit ring are connected to the housing of the flywheel as a field that excites the flywheel. Even if the engine becomes smaller and lighter and the total displacement decreases, it still provides the same power as the conventional engine brake, corresponding to the gear ratio of the transmission. It is also an excellent retarder that does not require a special propeller shaft, is lightweight and easy to control.

Furthermore, the present applicant has invented a cooling system that uses the engine's cooling system or a cooling system that is separate from the engine's cooling system as a cooling system for this retarder, and has filed a patent application filed at the same time as this application. did.

The present invention is based on the idea of these cooling devices, and provides a retarder cooling control device that can cool the retarder only when necessary and maintain the temperature of the retarder unit below a predetermined temperature. The purpose is to

The first 4 of the present invention? The characteristic is that the short-circuit ring of the retarder unit is fixed to the flywheel housing and is formed by an annular pipe, and in this pipe there is a pump that circulates a cooling medium that cools the retarder unit, a cooler that cools this cooling medium, and the above-mentioned. a temperature sensing element for electrically detecting the temperature of heat generated by the retarder unit;
means for controlling the flow rate of the cooling medium according to the heat generation temperature of the retarder unit detected by the temperature sensing element;
It's right there.

A second feature of the present invention is a means for increasing the flow rate of the cooling medium in the pipe of the short-circuit ring in synchronization with the activation of the retarder, and a means for increasing the heat generation temperature of the retarder unit detected by the temperature sensing element to a predetermined value. and means for reducing the flow rate of the cooling medium in the pipe when the temperature drops below the temperature.

Embodiments of the present invention will be described in detail below based on the drawings.

FIG. 1 is a block diagram of an apparatus according to a first embodiment of the present invention.

In FIG. 1, a magnetic flywheel 5 is attached to a crankshaft 3 between an engine 1 and a transmission 2. As shown in FIG. A plurality of magnetic teeth 6 are formed on the outer peripheral surface of the flywheel 5.

A retarder unit 9 is attached to the upper and lower parts of the nozzle 7 of the flywheel 5. This flywheel 5 acts as a retarder rotor, and the retarder unit 9 acts as a field that excites the magnetic teeth 6 of this flywheel 5.

FIG. 2 is an enlarged external perspective view of this retarder unit 9. In Fig. 2, a retarder unit 9, a magnetic prismatic iron core 10, a coil winding frame U fitted into the body of the iron core 10 and around which an excitation coil 11 is wound, and a coil winding frame U fitted onto the tip of the iron core 10 are shown. short circuit 33113 and this short circuit II 13
A temperature-sensitive element 14 is provided. The tip of this iron core lO is provided close to the magnetic teeth 6, and the tip of the iron core lO
When the excitation coil IIK current is applied when the excitation coil IIK faces the magnetic teeth 6, the opposing magnetic teeth 6 are excited and magnetized. Further, the temperature sensing element 14 electrically detects the heat generation temperature of the short circuit ring 130.

In addition, four bolt holes are drilled at the base end of the iron core lO,
The iron core lO is screwed onto the nozzle 7 by four magnetic bolts 15. Further, the short circuit 1113 includes a hollow conductive pipe 16, and an inflow pipe 18 and an outflow pipe 19 that communicate with the conductive pipe 16 and circulate a cooling medium, which will be described later, within the conductive pipe 16. Further, on the surface of the housing 7, electric terminals 21 and 22 of the excitation coil 11 are provided.
is provided.

Returning to FIG. 1, a radiator is connected to the front of the engine 1 via a pipe and a pipe. A thermostat is installed inside the pipe Z4, and a water pump 28 is attached to the pipe Z4. Moreover, the pipes 24 and 5 are connected by a bypass pipe device. This water pump 28 feeds cooling water to a water jacket (not shown) K pipe or four in the cylinder block of the engine 1. A water manifold 31 is connected to the water jacket in the cylinder block, and water that cools the cylinder is circulated through the thermostat 27.

A retarder cooling vibe n is connected to the SabK water manifold 31 via a control valve 33.

The inflow pipe 18 of the retarder unit 9 is connected to this retarder cooling vibe 32, and the outflow pipe 19 of the retarder unit 9 is further connected to the pipe 25 on the inlet side of the water pump via a return pipe section.

FIG. 3 is an electrical circuit configuration diagram of the device of this embodiment.

In FIG. 3, the comparison circuit is a comparison circuit, the output of the temperature sensing element 14 is connected to the comparison input, and the predetermined temperature of the iron core 10 is converted into a voltage and applied to the reference human power. The comparison output of this comparison circuit is connected to the control input of the control circuit. The control output of this control circuit is connected to the control power of the control valve section.

With such a configuration, the excitation coil 1 of the retarder unit 9
When a current is applied to the iron core 10 through the electric terminals 21 and 22, magnetic lines of force are generated in the iron core 10. At this time, if the flywheel 5 is rotating and the magnetic teeth 6 are moving, the lines of magnetic force in the iron core 10 will change and a current will be generated, and this current will circulate through the conductive pipe 16 of the short circuit m14 and convert mechanical energy into thermal energy. Convert to

For this reason, the conductive pipe °16Fi generates heat, and if the temperature of the iron core IO is lower than the predetermined temperature, the output voltage of the temperature sensing element 14 is smaller than the reference voltage E, so no comparison output is sent from the comparison circuit 36, and the control circuit 37 switches 37! L is turned off, the control valve 33 is closed, and the cooling water does not flow to the short circuit ring 13 of the retarder unit 9.

Next, when the temperature of the iron core 10 reaches a predetermined temperature, a comparison output is sent from the comparison circuit, and the switch 3 of the control circuit
7aFi is turned on, the control valve is opened, and cooling water is sent through the retarder cooling pipe 32 to the inflow pipe 18, and the conductive pipe 16 is cooled. It passes through the pipe 35 and returns to the pipe section on the inlet side of the water pump 28.

When the temperature of this cooling water rises, the thermostat n is activated and the radiator is forced to cool the water.

FIG. 4 is a block diagram of an apparatus according to a second embodiment of the present invention.

In FIG. 4, each symbol corresponds to each symbol in FIG. 1, respectively.

The characteristic structure of this embodiment is that the retarder's cooling medium is the lubricating oil of the engine 1, which gives it its nickname. That is, an oil pan 41 in which lubricating oil is stored at the bottom of the engine 10.
A strainer 43 is arranged inside and connected via a pipe 44 to an oil pump 6 driven by the crankshaft 3. This oil pump 45 is connected to an oil filter 48 via an oil cooler 47.

This oil filter mallet is connected to a main gear rally 49 cast into the crankcase. This main gear rally 49
A retarder cooling vibe 32 is connected to the retarder via a control valve. This control valve receives a control input from the control circuit 37 shown in FIG. 3, as in the first embodiment. Further, the return pipe 35 is installed inside the oil pan 41.

Since the operation of this embodiment is similar to that of the first embodiment, repeated explanation will be omitted.

FIG. 5 is a block diagram of an apparatus according to a second embodiment of the present invention.

In FIG. 5, each symbol corresponds to each symbol in FIG. 1, respectively.

A distinctive feature of this example is that the retarder cooling system is provided separately from the engine cooling system.

That is, the water pump is connected to the front end of the crankshaft 3 of the engine 1 by a belt 49 .

The water pump n is connected to a tank 52 storing cooling water through an intake art pipe 51, and its discharge side is connected to a control valve 33 through a vibe ring. This control valve 33 is given a control input from the control circuit n shown in FIG. 5, as in the first embodiment.

In addition, the control valve is connected between the retarder cooling vibe η and the bypass pipe, and when a control input is given to the control valve, the pipe 53 and the retarder cooling vibe 32 are communicated, so that no control input is received. When K connects the pipe & to the bypass pipe group. This bypass pipe section is piped into the tank 52. Further, the outflow pipe 19 is connected to a radiator that is provided separately from the cooling system of the engine l. The water cooled by the radiator group is returned to the tank 52 via the return pipe section.

Since this embodiment and its operation are similar to those of the first embodiment, repeated explanation will be omitted.

FIG. 6 is a block diagram of an apparatus according to a fourth embodiment of the present invention.

In FIG. 6, each symbol corresponds to each symbol in FIG. 5, respectively.

The characteristic configuration of this embodiment is that the retarder cooling system is provided separately from the engine cooling system, and the cooling oil is circulated by an oil pump 57 that is independently driven by the crankshaft 3. When the retarder switch is activated, the cooling oil is short circuit g11
13 and stops flowing into the short circuit ring 13 when the temperature sensing element 14 falls below a predetermined temperature.

That is, the motor 5 is connected to the drive shaft of the oil pump, and the cooling oil stored in the tank 52 is transferred to the pipe 51.
The oil is sucked into the oil pump 57 via the retarder cooling 741.
sent to the wings.

FIG. 7 is a block diagram of an electric circuit including the motor 59 and the excitation coil 11 of the retarder unit 9. .

In FIG. 7, one end of the vehicle's power source ω is connected to one end of a key switch 61 of the engine 1.
1 is connected to one end of a vehicle load 63, a control circuit 64, and a retarder switch 65, respectively. The control power of this control circuit is given the comparison output of the comparison circuit. The comparison circuit 67 is supplied with the output of the temperature sensing element 14 as a comparison input, and is supplied with a reference input in which a predetermined temperature of the iron core 10 is set as a reference voltage -EB.

Further, the output of the control circuit 64 is connected to the motor 59. The other end of the retarder switch is connected to one end of the plural excitation coils 11 and the comparison input of the comparison circuit 67 via a diode 68 for preventing backflow. power supply 60
, a load 8, a motor 59, and a plurality of excitation coils 11
Each other end of is grounded.

With this configuration, when the key switch 61 is turned on and the retarder switch 65 is turned on, the excitation coil 1
1 is applied, the conductive pipe 16 generates heat as described above, and at the same time, the voltage of the power source ω is applied to the comparison circuit 67. Since this voltage is higher than the comparison circuit 670 reference voltage E8, the switch 54a of the control circuit 64 is turned on and the motor 59 is driven.

This causes the cooling oil to circulate within the conductive vibrator 16.

Next, when the retarder switch 65 is turned off, the voltage of the power supply ω is no longer applied to the comparison input of the comparison circuit 67.
Only the output voltage of the temperature sensing element 14 is applied. At this time, if the temperature of the iron core 10 is still higher than the predetermined temperature, the voltage of the comparison input is higher than the reference voltage z8, so even if the retarder switch is in the off state, , the motor 59 continues to drive j)
Cooling of the Tardaninit 9 continues.

Further, when the temperature of the iron core 10 becomes lower than a predetermined temperature due to the circulation of this cooling oil, and the voltage of the comparison input of the comparison circuit 67 becomes lower than the reference voltage 1ri8-, the switch 54a of the control circuit U is turned off and the motor 59 stops.

Note that the opening/closing operation of the control valves in the first to third embodiments is similar to that in the fourth embodiment, in which the cooling medium starts flowing into the short circuit 1113 in synchronization with the activation of the retarder, and as the temperature of the retarder unit 9 decreases. The flow of the cooling medium may be controlled to be stopped.

Alternatively, the flow rate of the cooling medium in the short circuit 1113 may be controlled to increase in synchronization with activation of the retarder, and to decrease as the temperature of the retarder unit 9 decreases.

As described above, according to the present invention, by configuring the cooling medium to flow into the retarder unit according to the temperature of the retarder unit, the cooling device is operated only when it is necessary to cool the retarder, thereby saving energy. This has an excellent effect of preventing the retarder from occurring and also maintaining the temperature of the retarder unit below a predetermined temperature so that the braking force of the retarder does not decrease.

In particular by configuring the cooling medium to start flowing into the retarder unit upon start-up of the retarder.

The retarder unit is precooled, and the temperature of the retarder unit can be stably maintained at a predetermined temperature or lower.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a configuration diagram of an apparatus according to a first embodiment of the present invention. FIG. 2 is an enlarged external perspective view of the retarder unit. FIG. 5 is a diagram showing the electric circuit configuration of the cooling control device; FIG. 4 is a diagram showing the configuration of the second embodiment of the device of the present invention. FIG. 5 is a configuration diagram of an apparatus according to a third embodiment of the present invention. FIG. 6 is a configuration diagram of an apparatus according to a fourth embodiment of the present invention. FIG. 7 is also an electric circuit configuration diagram of the cooling control device. 1... Engine, 2... Transmission, 3... Crankshaft, 5... Flywheel, 6... Magnetic teeth,
7...Housing, 9...Retarder unit, 1
0... Iron core, 11... Exciting coil, 12... Coil winding frame, 13... Short circuit ring, 14... Temperature sensing element, 15
... Bolt, 16... Conductive pipe, 18... Inflow pipe, 19... Outflow pipe, 21, 22... Electrical terminal, O... Radiator, Sae, Anger... Pipe, γ...・
・Thermostat 1, ah...water pump, grave...bypass pipe, 31...water manifold, 32.
...Retarder cooling pipe, vane...control valve, word...return pipe, 36...comparison circuit, correction...control circuit, 3
7! L...Switch, Chrysanthemum...Lubricating oil, 41...Oil pan, Thun...Strainer, 44...Pipe, Thun...Oil pump, C...Oil colander, Hammer...Oil filter , 49...Belt, 51-...Pipe, 52...
Tank, edict...pipe, bypass pipe, group...radiator, 57...oil pump, 59...motor, 60...power supply, 61...key switch, B.
・・Load, ・Control circuit, 64a・Switch,
House... Retarder switch, 67... Comparison circuit, Nishiki...
-Diode. Patent Applicant Hino Motors Co., Ltd. Representative Patent Attorney Naotaka Ide “Figure 3, Figure 4, Figure 5-288

Claims (2)

[Claims] (1) A retarder unit that is fixed to the flywheel housing and includes an excitation coil and a short-circuit ring, and a retarder 1 trochanter that is pivotally attached to the crankshaft between the engine and the gear shifter and is excited by the retarder unit. In the retarder, the short-circuit ring is formed by an annular pipe, and the pipe includes a pump that circulates a cold medium that cools the K IJ meta unit, a cooler that cools the coolant, and the retarder unit. and a temperature sensing element for electrically detecting the heat generation source K of the retarder unit, and a means for controlling the flow rate of the cooling medium according to the heat generation temperature of the retarder unit detected by the temperature sensing element. Features: Retarder cooling control device. (2) A retarder unit that is fixed to the flywheel housing and includes an excitation coil and a short-circuit ring, and a retarder rotor that is pivoted to the crankshaft between the engine and the transmission and is moved by the retarder unit. In the retarder, the short circuit ring is formed by an annular pipe, and includes a pump that circulates a cooling medium that cools the retarder unit, a cooler that cools the cooling medium, and a pump that circulates the cooling medium in the pipe in synchronization with the activation of the retarder. means for increasing the flow rate of the cooling medium, a temperature sensing element for electrically detecting the heat generation temperature of the retarder unit in the retarder unit, and a temperature sensing element that detects the heat generation temperature of the retarder unit below a predetermined temperature. and means for reducing the flow rate of the cooling medium in the pipe.