JP2570275B2 - Start / stop device for vehicle electric load device - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an operation / stop device for an electric load device for a vehicle, and in particular, gradually operates the electric load when the electric load is switched from stop to operation. State, and when the electric load is switched from operation to stop, the electric load is gradually put into a stop state so that a sudden change in the rotation speed of the vehicle engine during idling operation can be prevented. The present invention relates to a device for starting and stopping an electric load device for a vehicle.

[Conventional technology]

2. Description of the Related Art Conventionally, an automobile as a vehicle is provided with many electric devices (electric loads), and a generator (generator) serving as a power supply source for these electric devices is provided.

This generator is driven by an engine, and a dynamo of a commutator rectification type or an alternator of a semiconductor rectification type is used as the generator.

In any of the methods, a field-back system is provided for changing the field current in accordance with the engine speed and the charge / discharge state of the battery in order to regulate the output terminal voltage within a predetermined range.

That is, as shown in FIG. 4, an alternator 1 whose rotor is driven by an engine is conventionally provided in an electric system of an automobile.
Includes the first to third phase coils of the stator (armature)
1a to 1c, a three-phase full-wave rectifier 1d connected to each of these coils 1a to 1c, and a field coil of a rotor (field)
1e, and an electric load (for example, a motor such as an electric fan for cooling a radiator, etc.) which receives a generated voltage between the plus side output terminal B and the minus output terminal E from the alternator 1 through the changeover switch 2. , A heater such as a defogger, etc.), an ignition 5 for receiving the generated voltage via the key switch 4, and a battery 6 for receiving the surplus power.

Further, a voltage regulator 7 for receiving the generated voltage via the key switch 4 is provided. The voltage regulator 7 changes the field current supplied from the excitation terminal F to the field coil 1e to increase / decrease the excitation and reduce the voltage. There is an electronic voltage regulator of transistor type or hybrid IC type and a tyryl type voltage regulator of mechanical contact type for adjusting.

[Problems to be solved by the invention]

However, since a changeover switch 2 is merely provided as a mechanism for starting and stopping an electric load in such a conventional vehicle electric system, when a large electric load 3 such as a radiator cooling electric fan is turned on / off. Since the total amount of the electric load fluctuates rapidly, the power generation control by the feedback system described above attempts to fluctuate the power generation amount correspondingly. That is, the load on the engine increases.

However, the engine rotation control system generally has poor response in order to improve stability, and the load rapidly changes at the time of switching by the changeover switch 2, and the engine rotation speed decreases or increases. There is a problem, particularly when idling, and this problem is remarkable, and the engine is more susceptible to small displacement engines and low fuel consumption engines.

To deal with such a problem only by the idle speed control (ISC) has a problem that the response of the ISC is improved, but the stability is deteriorated.

The present invention is intended to solve such a problem, and makes it possible to prevent a sudden change in the electric load by gradually changing the electric load without changing the rotation speed control of the engine. It is another object of the present invention to provide a vehicle electric load operating / stopping device capable of preventing a sudden change in the engine rotation speed.

[Means for solving the problem]

Therefore, the operation / stop device of the electric load device for a vehicle according to the present invention includes a generator driven by the engine, an electric load receiving the electric power generated by the generator, and a command to operate and stop the electric load. Switching means for switching the electric load from stop to operation by the switching means,
An electric load control means for gradually bringing the electric load into an operating state and for gradually stopping the electric load when the electric load is switched from operation to stop by the switching means is provided.

[Action]

In the above-described operation / stop device of the electric load device for a vehicle according to the present invention, when the electric load is switched from stop to operation by the switching unit, the electric load control unit operates so that the electric load is gradually activated. Further, when the electric load is switched from operation to stop, the electric load control means operates so that the electric load gradually stops.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 3 show an operation / stop device of an electric load device for a vehicle as one embodiment of the present invention.
In the figure, the same reference numerals as those in FIG.

Also in this embodiment, an alternator 1 whose rotor is driven to rotate by an engine is provided in the electric system of the automobile (see FIG. 4), and this alternator 1 has first to first stators (armature). 3 phase coil 1a ~ 1c
And a three-phase full-wave rectifier connected to each of these coils 1a to 1c
1d, and a field coil 1e of a rotor (field). An electric load (e.g., a power supply) that receives a generated voltage generated between the plus output terminal B and the minus output terminal E from the alternator 1 via the changeover switch 2 For example,
Motors such as a radiator cooling electric fan and heaters such as a defogger) 3, 3 ', an ignition 5 for receiving a generated voltage via a key switch 4, and a battery 6 for receiving surplus power. .

Further, a voltage regulator 7 for receiving the generated voltage via the key switch 4 is provided. The voltage regulator 7 changes the field current supplied from the excitation terminal F to the field coil 1e to increase / decrease the excitation and reduce the voltage. There is an electronic voltage regulator of transistor type or hybrid IC type and a tyryl type voltage regulator of mechanical contact type for adjusting.

Further, as shown in FIG. 1, in the present embodiment, the power supply control means is provided on the wiring 8 between the positive output terminal B and the changeover switch 2 for the first electric load (radiator cooling electric fan) 3. Further, a power supply control means 9 'is interposed in a wiring 8' between the plus side output terminal B and the switch 2 'for the second electric load (heater for defogger) 3'. Have been.

The power supply control means 9, 9 'is for controlling the on / off (duty control) of the electric load, and generates a triangular wave generating circuit 9a, 9a, which generates a triangular wave [see FIGS. 2 (a) and 3 (a)]. A delay circuit (integrating circuit or low-pass filter) that includes a 9'a, a capacitor and a resistor, and gradually increases (see FIG. 2 (b)) or decreases (refer to FIG. 3 (b)) upon step input. 9b, 9'b and triangular wave generator 9
Open collector comparator 9 which receives a triangular wave signal from a, 9'a at a negative terminal and receives a boost signal or a step-down signal from delay circuits 9b, 9'b, respectively, at a positive terminal.
c, 9'c, and a power for switching on and off upon receiving a rectangular wave signal [see FIGS. 2 (c) and 3 (c)] which is an output signal from the comparators 9c, 9'c, respectively. It comprises transistors 9d and 9'd and pull-up resistors 9e and 9'e connected to the output terminals of the comparators 9c and 9'c.

Further, a rotation speed control device including an idle rotation speed control (ISC) of the engine is provided.

Operation of the vehicle electric load device as an embodiment of the present invention
Since the stopping device is configured as described above, the changeover switch 2 for the first electric load (radiator cooling electric fan) 3 and the changeover switch 2 'for the second electric load (heater for defogger) 3' are turned off. When switched on, the second
As shown in FIGS. 7A to 7C, the time width during which the voltage is turned on gradually from the time when the electric load is switched by the delay circuits 9b and 9'b [see time t _{ON in} FIG. 2B] is gradually increased. A voltage is applied with increasing duty control [see FIG. 2 (c)].

When the changeover switch 2 for the first electric load (electric fan for radiator cooling) 3 and the changeover switch 2 'for the second electric load (heater for defogger) 3' are switched from on to off, FIG. As shown in FIGS. 3A to 3C, when the electric load is switched by the delay circuits 9b and 9'b [FIG.
At time _tOFF ], the voltage disappears by duty control that gradually reduces the time width during which the voltage is turned on [see FIG. 3 (c)].

As a result, the electric load gradually increases or decreases, so that a sudden change in the electric load can be prevented, and the engine speed control can respond sufficiently.

Therefore, a decrease or increase in the engine speed can be prevented, and the engine speed is stabilized, which contributes to the stability of the engine speed particularly during idling.

When the present invention is applied to a small displacement engine or a fuel-efficient engine, the effect is remarkably exhibited.

Note that chopper control or frequency modulation control with an equal pulse width may be used instead of the duty control.

Further, the same configuration can be obtained by using a dynamo as a generator.

〔The invention's effect〕

As described in detail above, according to the operation / stop device of the electric load device for a vehicle of the present invention, since the electric load connected to the generator is configured to start or stop gradually, the idling speed is reduced. At the time of control, disturbance caused by the stoppage of the operation of the electric load becomes slow, so that stable idle speed control can be performed. Further, there is an advantage that noise and vibration caused by sudden start and stop of the electric load can be prevented.

[Brief description of the drawings]

1 to 3 show an operation / stop device of an electric load device for a vehicle as one embodiment of the present invention. FIG. 1 is an electric circuit diagram thereof, and FIGS. 3 (a) to 3 (c) are graphs showing changes from the off state to the on state.
Are graphs showing the change from the ON state to the OFF state, and FIG. 4 is a wiring diagram showing a conventional electric system for a vehicle. 1. Alternator, 1a to 1c ... First to third phase coils,
1d: three-phase full-wave rectifier, 2,2 'changeover switch, 3,3'
... Electrical load, 4 ... Key switch, 5 ... Ignition, 6 ... Battery, 7 ... Voltage regulator, 8,8 '... Wiring, 9,9' ... Power supply control means, 9a,
9'a... Triangular wave generating circuit, 9b, 9'b... Delay circuit, 9c,
9'c: comparator, 9d, 9'd: power transistor, 9
e, 9'e ... pull-up resistor.

Claims (1)

(57) [Claims] An operation of an electric load device for a vehicle, comprising: a generator driven by an engine; an electric load receiving electric power generated by the generator; and switching means for instructing operation and stop of the electric load. In the stopping device, when the electric load is switched from stop to operation by the switching means, the electric load is gradually turned on, and when the electric load is switched from operation to stop by the switching means, the electric load is changed. An operation / stop device for an electric load device for a vehicle, comprising electric load control means for gradually stopping the electric load.