JPS6113748Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an engine starting device that can improve the starting characteristics when the engine is cold started.

A conventional device of this type is shown in FIG. In the figure, 1 is a storage battery that normally has a terminal voltage of 12V and constitutes one unit, 2 is a starter that is supplied with power from the storage battery 1, 3 is a magnetic switch, and 4 is a power supply to this magnetic switch. The DC motor energized by this, 5, is a key switch of the engine that controls the energization of the magnetic switch.

Next, a conventional device having the above configuration will be explained.
Now, the key switch 5 is closed, the magnetic switch 3 is energized, the main contact 8a is closed, and a closed circuit from the battery 1 to the main contact 3a, the DC motor 4, and the ground is formed, and the starter is activated. 2 energizes and starts the engine (not shown). By the way, when the engine is started in cold weather, the electromotive force decreases due to the cooling of the battery, and the viscosity of the engine sliding lubricating oil increases and freezes. The torque becomes abnormally high, so the engine cannot be energized with a sufficient starting rotation speed, and the ignition system cannot function adequately for the reasons mentioned above. As shown, a storage battery 1a was additionally connected to double the electromotive force to perform engine starting operations in cold weather.

As described above, in the case of a conventional starter power supply device, when the starting force of the starting system is insufficient during a cold start, it is necessary to additionally connect the battery 1a to start. Battery 1a must be removed after the engine is started, and the electrical components that input power to the battery do not have a protection function against high voltage when the battery is warmed up for a long time with the battery attached. In this case, the high voltage and high voltage power supply has the disadvantage that electrical components may be destroyed.

This idea was made in order to eliminate the drawbacks of the conventional ones as described above, and uses multiple storage batteries as a power source for power supply to the starter, and the switching elements are controlled by the output signal of the detection device that detects the temperature of the engine. To provide a device that automatically connects the plurality of storage batteries in series at the time of a cold start so that power can be supplied to the starter from a high voltage power supply, thereby obtaining the necessary biasing force at the time of starting. It is intended to.

Hereinafter, FIG. 3 showing an embodiment of this invention will be explained. In the figure, 6 is a two-circuit C contact 6a,
6b and a coil 6c; 7 is a control device having a function of energizing the coil 6c of the electromagnetic switch 6 to switch the C contacts 6a and 6b; It has an input terminal 7b, and receives these signals to obtain necessary switching operations.

Next, the operation of the above embodiment will be explained using FIG. 4. Now, when the key switch 5 is closed, the control device 7 determines two types of inputs from the input terminals 7a and 7b: warm-up or cold state of the engine, and ignition or non-ignition rotation state, and The circuit required for the cold start condition shown in Figure 4 is constructed.

That is, the circuit shown in FIG. 3 is used when the engine is started, especially during warm-up when the rotational load is not large (normal state), and in this case, the control device 7 does not output an output signal, so the coil 6c is not energized and the battery is Since the C contact of the electromagnetic switch 6 is in the illustrated connection position, the switches 1 and 1a are connected in parallel to each other to obtain a terminal (supply) voltage of 12V.
Next, during a cold start, the coil 6c of the electromagnetic switch 6 is energized by the output signal of the control device 7, and the C contacts 6a, 6b are switched to the state shown in FIG. They are connected in series to obtain a terminal (supply) voltage of 24V.

Therefore, the power supply device is 12V in normal operation and 24V in cold start, making it an extremely flexible device, and also has the effect of reducing the load on the device in normal operation.

In the above embodiment, two storage batteries are switched in series by energization of an electromagnetic switch, but instead of the switch, a switching element such as a silicon-controlled rectifier or a semiconductor switching element such as a transistor may be used. The same effect can be achieved even if Further, although the example uses two storage batteries, it may be configured with three or more storage batteries as necessary. Furthermore, the input information to the control device 7 may be only the engine temperature; in this case, it is possible to use a method in which two c-contacts are switched by a temperature-mechanical displacement converter using a bimetal mechanism or a bellows mechanism. be. Furthermore, if the temperature detection signal is used as an information source for knowing the cold start condition by inputting the battery tank temperature of the storage battery, the effects of this invented device can be further enhanced.

By the way, as another effect of this invented device, when the storage batteries are connected in series, only the engine ignition system can be energized, and the other systems can be disconnected to protect the device at the same time.

As described above, according to this invention, a high load condition during a cold start of the engine is detected by a temperature signal, and a plurality of storage batteries prepared in advance are connected in series by a switch device to provide a high voltage power source. Since it is now possible to supply power to the starter, the load (output power) on the device during normal operation can be reduced by installing a simple device without changing the conventional power supply voltage of the electrical components, reducing the stress generated. This has the effect of making it possible to start even at extremely low temperatures.

[Brief explanation of the drawing]

Figure 1 is a circuit diagram for explaining the conventional device, Figure 2 is a circuit diagram for explaining the conventional device.
The figure is an explanatory circuit diagram of the conventional device, and FIGS. 3 and 4 are circuit diagrams showing an embodiment of the invention. In the figure, 1 and 1a are storage batteries, 2 is a starter, 5 is a key switch, 6 is an electromagnetic switch, 7 is a control device, and 7a, 7b are signal input terminals thereof. In addition, in the figures, the same reference numerals indicate the same or corresponding parts.

Claims (1)

[Scope of utility model registration request] A plurality of storage batteries constituting a power source for supplying power to a starter for starting the engine, a detection device that detects the temperature during cold starting, and a switching element that connects the plurality of storage batteries in series based on the output signal of the detection device. An engine starting device characterized in that the engine starting device is characterized in that it is capable of supplying power to the starter by a high voltage power supply during the cold start.