JPH0517423Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] The present invention relates to a starter safety device for an internal combustion engine that prevents the starter from turning even if the starter switch is accidentally turned on while the engine is rotating. This relates to an improved drive circuit for a safety relay that stops rotation.

[Prior Art] Generally, in the case of a rear engine bus where it is difficult to tell whether the engine is rotating or not, even if you accidentally turn on the starter switch while the engine is running, the starter will not turn while the generator is generating electricity (engine is rotating). A safety relay is installed to prevent this. This safety relay also operates when the engine starts, so once the generator starts generating electricity, the starter will stop rotating even if the starter switch is left on.

However, especially when starting at low temperatures, the generator may generate electricity before the engine has finished starting, resulting in the inconvenience that the safety relay operates and stops the starter even though the engine has not started.

For this reason, conventionally, when starting at low temperatures, activation switches for low-temperature starting auxiliary means, such as intake heater temperature control devices as typified by JP-A-59-82561, or ordinary intake heaters without a control mechanism, have been used. The safety relay was set to release when the starter switch was turned on, so that the starter continued to rotate while the starter switch was turned on, so that starting performance at low temperatures was not hindered.

Incidentally, as a related technique, there is Japanese Utility Model Publication No. 54-38412.

[Problem to be solved by the invention] However, the activation switch of the cold start aid means cannot be activated.
Conventional models in which the safety relay did not work when turned on had the following problems.

If the low temperature starting aid is an intake heater temperature control device, if the device operation switch is left on, the safety relay will not work and the starter will turn at any time. Therefore, the starter rotates even after the engine has been started, which is inconvenient.

On the other hand, when the intake heater temperature control device is turned off at low temperatures,
Since the safety relay works all the time, the starter stops. Therefore, startability is poor unless an intake heater temperature control device is used.

In particular, even if the intake heater temperature control device is turned on, it cannot be used unless the attached water temperature switch is turned on. For this reason, the water temperature switch is turned off, i.e.
Even when the temperature does not require the intake heater temperature control device, if the operation switch of the intake heater temperature control device is turned on, the safety relay will not work, resulting in the same result as above.

Similarly, when the cold start aid is simply an intake heater, the above problems (1) and (2) occur.

As described above, the current situation is that if priority is given to startability, safety is impaired, and conversely, if priority is given to safety, startability is worsened.

[Purpose of the invention] The present invention solves the above-mentioned conventional problems and provides a starter safety device for an internal combustion engine that can successfully solve startability and safety to the maximum possible extent with a simple configuration. be.

[Summary of the invention] The present invention, which meets the above objectives, is to operate the safety relay that prevents the starter from rotating while the internal combustion engine is rotating, not when the activation switch of the low temperature starting aid is turned on, but when the thermoswitch that detects the low temperature is turned on.
It is configured to operate when it is turned on.

As a result, regardless of whether or not the low-temperature start assist means is activated, the safety relay is prevented from operating only during low temperatures when the internal combustion engine has not yet completed starting, and prevents the starter from rotating after the start is complete or from stopping before the start is complete. This is to prevent it from getting wet.

[Example] An example of the present invention will be described below based on the drawings.

The figure shows an example of a starter safety device for an internal combustion engine according to the present invention.

1 is an intake heater temperature control device as a low temperature starting aid means, and its operation switch 2 is
It functions when it is turned on and the attached water temperature sensor (thermo switch) 3 detects the set temperature, for example, 0±5°C or less. Its function is already mentioned in Japanese Unexamined Patent Publication No. 59
Although it will not be discussed in detail since it is described in Publication No. 82561, in order to improve startability at low temperatures, the voltage applied to the intake heater and the fuel supply are controlled to rapidly raise the temperature of the intake heater, thereby reducing overheated intake air. It is designed to be sent to the engine. 4 is an accelerator switch, and 5 is a fuel increase relay.

Whether or not to use the intake heater temperature control device 1 is determined by turning on/off the operating switch 2.
Selected by OFF.

Reference numeral 6 denotes an internal combustion engine that can be started by the intake heater temperature control device 1. As the internal combustion engine 6 rotates, a generator 7 starts generating electricity, and supplies the generated signal output to a safety relay 8. This safety relay 8 has a function of stopping the starter 10, which rotates when the starter switch 9 is turned on, when it receives a power generation signal.

This power generation signal is transferred to the supply line 11 that supplies the safety relay 8 by its operation.
A relay 12 is provided to cut off the power generation signal and cut off the supply of the power generation signal. This relay 12 is not driven by an operating switch 2 as in the conventional case shown by a dotted line, but is driven by a thermoswitch 3 attached to the intake heater temperature control device 1. Therefore, ON/OFF of operating switch 2
Regardless, when the thermo switch 3 is turned on, the relay 12 is activated and the power generation signal supply line 11 is cut off. The thermoswitch 3 does not have to be used for both purposes as shown, but may be provided separately for the relay.

Now, in order to start the internal combustion engine 6 at a low temperature of 0±5°C or less using the intake heater temperature control device 1 in the above configuration, the operation switch 2 of the device is turned on, but the temperature must be set to the above temperature. Thermoswitch 3 is in the ON state. Here, when the starter switch 9 is turned on, combustion of the intake air heated by the rapid temperature rise of the intake heater is promoted, and the internal combustion engine 6 starts to start as the starter 10 rotates. As the internal combustion engine 6 rotates, the generator 7 outputs a power generation signal, but since the thermo switch 3 is ON, the relay 12 is activated and the supply of this power generation signal to the safety relay 8 is cut off. Therefore, safety relay 8 does not work, and if starter switch 9 is in the ON state, starter 1
0 continues to rotate. However, when the starting of the diesel engine 6 is completed due to continued rotation of the starter 10, the engine water temperature exceeds the set temperature, the thermoswitch 3 is turned off, the relay is deactivated, and the power generation signal line to the safety relay 8 is thereby restored. Therefore, the safety relay 8 immediately operates to stop the rotation of the starter 10. Therefore,
Even if the starter switch 9 is still in the ON state after the diesel engine 6 has started, or even if the starter switch 9 is turned ON again by mistake, the starter 10 will not rotate regardless of the state of the device operation switch 2. . This is particularly useful for rear engine buses where engine rotation is difficult to determine.

To start the internal combustion engine 6 at low temperature without using the intake heater temperature control device 1, the device operation switch 2 is turned OFF. Operation switch 2
Even if it is turned OFF, the relay 12 is not affected, and the supply of the power generation signal is cut off only when the thermo switch 3 changes from OFF to ON. Therefore, when the starter switch 9 is turned on, the safety relay 8 does not work until the engine start is completed and the water temperature rises, and the starter 10 continues to rotate without stopping midway. Therefore, the engine can be started smoothly without using the intake heater control device 1.

In addition, since the thermoswitch 3 attached to the intake heater control device 1 also serves as the thermoswitch for operating the relay 12, the number of parts can be reduced, and when the intake heater control device 1 is used, the safety relay The conditions for canceling 8 match. Therefore, it is possible to avoid misalignment caused by the safety relay 8 operating indiscriminately when the temperature is high and the intake heater control device 1 is not required.

As described above, this embodiment is particularly effective when applied to a rear engine bus that uses a safety relay and is equipped with an intake heater control device, but it can also be applied to vehicle types other than rear engine buses. It is also possible to obtain effective effects.

Furthermore, instead of installing the intake heater control as the low-temperature start assisting means, a normal intake heater may be used, and in this case, since a thermoswitch is not provided, it is necessary to newly provide a thermoswitch.

[Effects of the invention] In summary, according to the invention, the following excellent effects are achieved with a simple configuration in which the safety device is activated by a thermoswitch.

(1) Even if you leave the activation switch for the low-temperature start aid in the ON position, the water temperature will rise while the engine is running, so the safety device will activate. Therefore, if you accidentally turn on the starter switch after the engine has started, the water temperature will rise.
The starter does not turn even if it is turned on.

(2) When the thermo switch is ON, the safety device is released without turning on the activation switch of the low temperature starting aid, so the starter switch is activated.
If it is ON, the starter will continue to rotate. Therefore, the engine can be started easily even when the cold start assisting means is not used.

[Brief explanation of drawings]

The figure is a circuit diagram of a starter safety device for an internal combustion engine according to an embodiment of the present invention. In the figure, 1 is an intake heater temperature control device as a low temperature starting aid means, 2 is an operating switch, 3 is a thermo switch (water temperature sensor), 6 is an internal combustion engine,
7 is a generator, 8 is a safety relay (safety device), 1
0 is a starter and 12 is a relay.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A low-temperature start assisting means, a safety device that stops the starter by supplying a power generation signal from the generator that is generated in accordance with the engine speed, and a safety device that operates to stop the starter. A starter safety device for internal combustion engines that includes a relay that cuts off the supply of power generation signals and a thermoswitch that detects low temperatures and activates the relay. (2) The cold start assisting means described above is activated when the activation switch is activated.
An intake heater temperature control device that rapidly raises the temperature of the intake heater by controlling the applied voltage and fuel supply to the intake heater when the intake heater is turned on and the water temperature switch detects a low temperature, and the thermoswitch is the water temperature switch. A starter safety device for an internal combustion engine according to claim 1 of the utility model registration claim. (3) The cold start assisting means described above is activated when the activation switch is activated.
A starter safety device for an internal combustion engine according to claim 1, which is an intake heater that applies voltage and supplies fuel when turned on.