JPH0577572U - Afterheat prohibition device for diesel engine - Google Patents

Abstract

(57) [Abstract] [Purpose] In a vehicle equipped with an electric afterheater, to prevent over-discharge of a battery due to operation of the afterheater when the engine is repeatedly started and stopped for a short time. [Structure] A switch 6 for opening and closing the circuit for supplying a driving current to an afterheater is provided in the middle of the circuit, and the switch 6 is opened when the operation and stop of the engine are repeated in a short time. The operation of the afterheater is prohibited by.

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, if the engine is repeatedly started and stopped for a short period of time, the afterheat device is activated each time the engine is started, but the battery is not sufficiently charged after that. There was a problem that the battery was over-discharged during this period because the engine was stopped.

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, in the present invention, in a diesel engine equipped with an electric afterheater, a switch for opening and closing the circuit is provided in the middle of a circuit for supplying a drive current to the afterheater.

[0007]

In the above structure, when the operation and stop of the engine are repeated within a short time, the operation of the afterheater associated with the low temperature start can be prohibited by opening the switch, and accordingly, the operation of the battery can be prevented. The burden is reduced.

Also, by closing the switch, it becomes possible to operate the afterheater 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 an engine intake passage, 3 is a normally-open relay switch that opens and closes a drive current of a heater 2, and 4 is a relay switch 3. Preheat timer 5 is also an afterheat timer.

The preheat timer 4 and the afterheat timer 5 are provided in parallel with each other, and each relay switch 3 is operated at a low temperature through a circuit (not shown) that detects an operating state and controls the operation thereof. The circuit for the heater 2 is closed by energizing the heater 2, and the intake air is heated by the heater 2 for a predetermined time at the start and after the start.

In the present embodiment, in a diesel engine equipped with such an afterheat device, a switch 6 is provided in the middle of a circuit for supplying a relay exciting current from an afterheat timer 5 as shown in the figure.

The switch 6 is opened at the beginning of the assembling, and until the switch 6 is closed, the energization of the relay switch 3 by the afterheat timer 5 is cut off, that is, the afterheat control is prohibited. For this reason, even if the engine is frequently started and stopped, the afterheater does not operate during that period, so that the battery 1 is surely prevented from being consumed during that period.

On the other hand, since the afterheat circuit is established by closing the switch 6, after that, when the engine is started at a low temperature, the afterheat timer 5 supplies the exciting current to the relay switch 3 to heat the heater 2, that is, The desired afterheat control is performed. Therefore, under normal use conditions, the original function of an afterheater, which prevents the generation of white smoke, is secured.

In FIG. 1, a switch 6 is provided inside a control unit 7 in which a preheat timer 4 and an afterheat timer 6 are housed so that the operation of the switch 6 cannot normally be done carelessly. However, as an alternative to this, the switch 6 may be interposed in the middle of the wiring to the relay switch 3 as shown in FIG.

By the way, the switch 6 for prohibiting the operation of the afterheater is necessary only under special conditions in which the engine is started and stopped repeatedly for a short period of time. It is not preferable if there is an accidental switch in the case of. In particular, when the switch 6 is provided outside the unit 7 as shown in FIG. 2, the risk of erroneous operation increases.

In order to prevent such an erroneous operation, the switch 6 may have a structure as shown in FIG. 3, for example. This is provided with a cover 15 on a sliding knob 14 provided with a piece 13 for opening and closing the contacts 11 and 12 of the circuit, and the knob 15 is provided on the cover 15 from the open position shown in FIG. The opening 16 is provided so as to allow only the movement to the closed position shown in FIG. When the opening 16 is once operated to the closed position as shown in FIG. 6B, the knob 14 is blocked by the cover 15 and cannot be operated, so that there is no possibility that the circuit will be reopened thereafter.

[0018]

According to the present invention, when a switch for opening and closing the circuit is provided in the middle of the circuit for supplying the driving current to the afterheater, and the operation and stop of the engine are repeated in a short time. It is possible to prevent the afterheater from operating due to frequent start / stop at low temperatures by opening this switch on the power supply, so it is possible to prevent wasteful battery discharge under special operating conditions. The effect is obtained.

[Brief description of drawings]

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

FIG. 2 is a schematic configuration diagram of another embodiment of the present invention.

FIG. 3 is a side sectional view showing an embodiment of a switch.

[Explanation of symbols]

 1 Battery 2 Heater 3 Relay switch 4 Preheat timer 5 Afterheat timer 6 Switch

Claims (1)

[Scope of utility model registration request] 1. A diesel engine equipped with an electric afterheater, characterized in that a switch for opening and closing the circuit is provided in the middle of a circuit for supplying a drive current to the afterheater. Heating equipment.