JPH0577571U - Afterheat prohibition device for diesel engine - Google Patents

Abstract

(57) [Abstract] [Purpose] In a vehicle equipped with an electric afterheater, to prevent overdischarge of a battery due to the operation of the afterheater associated with repeated start and stop of the engine. A diesel engine equipped with an afterheat control device for stopping the drive of the heater 2 by short-circuiting the control terminal 5 of the afterheat device to the ground side via a regulator switch 6 that closes when the alternator generates electricity. A short-circuit switch 7 for manually short-circuiting the control terminal is provided in parallel with the regulator switch 6, and when the operation and stop of the engine are repeated for a short time, the switch 7 is placed in the short-circuit position to operate the afterheater. Prohibit

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a diesel engine afterheat device.

[0002]

[Prior art and problems to be solved]

 Some diesel engines are equipped with an electric afterheat device for heating intake air after starting in order to prevent the generation of white smoke after starting at low temperature (see Japanese Utility Model Laid-Open No. 3-83362).

The electric power for driving the afterheater is covered by the electric power of the engine-driven generator and battery, but under normal use conditions, the engine is operated after the afterheater is stopped. Since the battery is charged, driving the afterheater does not burden the battery.

However, when the engine is repeatedly started and stopped for a short period of time, the battery is not sufficiently charged thereafter even though the afterheater operates every time the engine is started. Since the engine is stopped as it is, there was a problem that the battery was over-discharged during this period.

The present invention has been made in view of such conventional problems, and an object thereof is to make it possible to temporarily inhibit the operation of the afterheater.

[0006]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention comprises an afterheat control device for stopping the drive to the heater by short-circuiting the control terminal of the afterheat device to the ground side through a regulator switch that is closed when the alternator is generating power. In the diesel engine, a short-circuit switch for manually short-circuiting the control terminal is provided in parallel with the regulator switch.

[0007]

[Action]

 In the above configuration, when the engine is repeatedly operated and stopped for a short period of time, by setting the short-circuit switch to the short-circuit side, it is possible to prohibit the operation of the after-heat device associated with the low temperature start, and that is the battery. Burden is reduced.

Further, by closing the switch, the afterheater can be used under normal use conditions.

[0009]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings.

In FIG. 1, 1 is a battery, 2 is a heater installed in the middle of the engine intake passage, 3 is a normally open relay switch for opening and closing the drive current of the heater 2, and 4 is a relay switch 3. It is an after-heat device (after-heat timer) that turns on and off the heat generation of the heater 2.

The afterheat device 4 basically controls the relay switch 3 so that the heater 2 is energized at low temperature based on the current supplied from the battery 1, but the generator is in a power generation state to some extent. Then, the drive of the heater 2 is stopped by the regulator switch 6 which is closed accordingly.

That is, the regulator switch 6 is open until there is an engine-driven generator (not shown) until power generation is started to some extent, and thus the afterheat device 4 can energize the heater 2. On the other hand, when the engine speed rises and the generator starts a predetermined power generation, the regulator switch 6 is closed and the control terminal 5 is short-circuited to the ground side. In this state, the power supply to the heater 2 is stopped.

In the present embodiment, in a diesel engine equipped with such an afterheater 4, a manual short-circuit switch 7 is interposed between the control terminal 5 of the afterheater 4 and the ground side as shown in the figure. To wear.

The short-circuit switch 7 has the control terminal 5 short-circuited to the ground side at the beginning of the assembling, and until the switching, the power supply to the relay switch 3 by the after-heat device 4 is cut off, that is, after-heat control is prohibited. To be done. Therefore, even if the engine is frequently started and stopped, the heater 2 does not operate during that period, and therefore the battery 1 is surely prevented from being consumed during that period.

On the other hand, by switching the short-circuit switch 7 and connecting the control terminal 5 to the regulator switch 6 side (this state will be referred to as “open state” for convenience), thereafter, after the engine is started at a low temperature. The desired after-heat control is performed in which an exciting current is supplied to the relay switch 3 by the after-heat device 4 to heat the heater 2. Therefore, the original function of the after-heat device that prevents the generation of white smoke is secured under the normal use condition of the vehicle.

By the way, the short-circuit switch 7 for prohibiting the operation of the afterheater 4 is necessary only under special conditions in which the start and stop of the engine are repeated for a short time, and the vehicle is regularly inspected. It is not preferable if there is a chance that they will be mistakenly switched during such cases.

In order to prevent such an erroneous operation, the short-circuit switch 7 may have a structure as shown in FIG. 2, for example. This is provided with a cover 15 on a sliding knob 14 provided with a section 13 for connecting the contact 10 (control terminal 4A side) of the circuit to either the short-circuit side contact 11 or the open-side contact 12, and the cover 15 is provided on the cover 15. Is provided with an opening 16 so as to allow only the movement of the knob 14 from the short-circuited position shown in FIG. 7A to the open position shown in FIG. When the opening 16 is once operated to the open position as shown in FIG. 6B, the knob 14 is blocked by the cover 15 and cannot be operated, so that the control terminal 4A is connected again to the short-circuit side. There is no danger of it getting lost.

[0018]

[Effect of the device]

 According to the present invention, a switch for manually short-circuiting the control terminal of the afterheater to the ground side is provided, and when this engine is repeatedly operated and stopped for a short period of time, this switch is placed in the short-circuited position to reduce the temperature. Since it is possible to prohibit the operation of the afterheater device due to frequent start and stop in the vehicle, it is possible to reliably prevent wasteful discharge of the battery during special operating conditions. ..

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an embodiment of the present invention.

FIG. 2 is a side sectional view showing an embodiment of a switch.

[Explanation of symbols]

 1 Battery 2 Heater 3 Relay switch 4 Afterheater device 5 Control terminal 6 Regulator switch 7 Short-circuit switch

Claims (1)

[Scope of utility model registration request] 1. A diesel engine having an afterheat control device for stopping the driving of a heater by short-circuiting the control terminal of the afterheat device to the ground side through a regulator switch closed when the alternator generates electricity. An afterheat inhibiting device for a diesel engine, comprising a short-circuit switch for manually short-circuiting the control terminal in parallel with the switch.