JPH025073Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of an idling delay device for a turbocharged automobile (hereinafter also referred to as a turbo vehicle).

Turbo vehicles equipped with a turbocharger have become popular among automobiles, especially four-wheeled vehicles. The turbine used in this turbocharger is 10 when running.
Rotates at high speeds of 10,000 to 150,000 rpm and has a temperature of 900°C.
reach even. While driving, the oil pump supplies and circulates engine oil to cool the turbine, but when the ignition switch is opened to stop the engine, the oil pump also stops, so engine oil is not supplied to the turbine. It disappears. However, even after the engine has stopped, the turbine continues to rotate until its inertia is lost, which can lead to seizure.

Therefore, it is preferable to leave the engine idling for several minutes after driving, but this idling does not allow the driver to leave the vehicle, which is very troublesome. In order to solve this problem, an engine delay stop device or idling delay device is conventionally known in which the engine continues to idle for several minutes due to the action of a timer circuit even when the ignition switch is opened, and then stops.

However, since conventional devices do not have safety circuits, if a malfunction occurs in the device, especially the timer circuit built into the device, it will malfunction, and the engine will continue to idle without stopping even after a certain period of time has passed.
There is a risk of wasteful fuel consumption and overheating, and there are also problems in that the driver cannot leave the vehicle until he/she confirms that the engine has stopped.

Therefore, in order to solve the above problems, this invention
The present invention is characterized in that a protective timer circuit is connected to the timer circuit to stop the engine after a certain period of time when the timer circuit malfunctions, and will be described below with reference to the drawings.

Figure 1 is a block diagram of a conventional delay device, in which 1 is a power battery, 2 is an ignition switch, 3 is a relay, 4 is an engine drive device, 5 is a timer circuit,
6 indicates a transistor. When the ignition switch 2 is opened at the end of driving, a signal is applied to the input of the timer circuit 5, and the output side remains Hi for a certain period of time.
(High), and as a result, transistor 6 is turned on during that time, and current flows through the coil of relay 3.
Until then, it was OFF, and the relay contact is now ON. As a result, voltage is supplied from the power supply battery 1 to the engine drive device 4 through the contacts of the relay 3, idling the engine. When the time set in the timer circuit 5 has elapsed, the output side becomes Lo.
(Low), transistor 6 and relay 3
Since it is turned OFF, the voltage supply to the engine drive device 4 is stopped, and the engine is stopped. Therefore, if the timer circuit 5 malfunctions for some reason and its output side does not become Lo, the engine will continue to idle, causing the above-mentioned problem.

Figure 2 is a circuit diagram showing an embodiment of the present invention;
The figure is an explanatory diagram of the operating state of each component over time, and numeral 5 indicates the main timer circuit similar to that in FIG. When the input of both timer circuits 5 and 17 changes from Hi to Lo, the output changes from Lo to Hi after a set time. When the ignition switch 2 is opened at the end of operation, the electric charge that had been stored in the capacitor 12 turns on the transistor 9, which turns on the transistor 10.
By turning OFF, the input of timer circuit 5 becomes Hi.
The transistor 6 turns on as the voltage changes from low to low (time T ₁ ). As a result, a current flows through the coil of the relay 3, turning its contact ON (time T ₂ ), and as in the past, voltage is supplied to the engine drive device 4 from the power battery, and the engine idles. When the relay contact is turned ON, the transistor 13 is turned ON and the transistor 10 is kept OFF, so the same state is maintained even after the capacitor 12 has finished discharging, and the engine continues to idle.
Then, when the output side of the timer circuit 5 changes to Hi after the set time (time T ₃ ), the transistor 7 turns on, the transistor 6 returns to OFF, and the relay 3
No current flows through the coil, so the relay contact turns OFF and the voltage supply to the engine drive device 4 stops (time T ₄ ), so the engine stops idling. Also, the output of the timer circuit 5
Hi becomes Lo when the relay contact turns OFF.
, the input becomes Hi, and transistor 7 also becomes
It turns OFF.

During the operation as described above, when the contact of the relay 3 turns ON, the transistor 14 also turns ON, so the input to the protection timer circuit 17 is at timing T ₂
changes from Hi to Lo. The setting time of this protection timer circuit 17 is, for example, 1.5 of the timer circuit 5.
Double it and set it aside. As a result, when the input of the protection timer circuit changes from Hi to Lo, and before the output of the protection timer circuit 17 changes from Lo to Hi after the set time, the output of the timer circuit 5 changes from Lo to Hi. Therefore, the transistor 14 is turned off and the input of the protection timer circuit 17 changes from Lo to Hi.
Since the output changes to , no Hi level is output. In other words, when the timer circuit 5 is operating normally, this timer circuit stops the engine from idling at time _T4 .

However, if for some reason the output of the timer circuit 5 does not change to Hi after the set time, the output side of the protective timer circuit will not change when the set time has elapsed (time T ₅ ), as shown by the broken line in Figure 3. Changes to Hi,
As a result, the transistor 15 is turned ON, the transistor 6 is turned OFF, and current no longer flows through the coil of the relay 3. Therefore, the contact of the relay 3 is turned OFF (time T ₆ ), and the engine drive device 4
The voltage supply to the engine will stop, and the engine will stop idling. In addition, the output of the protection timer circuit 17
Hi becomes Lo when the relay contact turns OFF, the input becomes Hi, and the transistor 15 also turns OFF at the same time.

Although it has been explained that the set time of the protection timer circuit 17 is 1.5 times the set time of the timer circuit 5, the present invention is not limited to this. In other words, time T ₅ only needs to be delayed from T ₃ (of course, if it is delayed for too long, fuel will be wasted), so the setting time of the protective timer circuit should be T ₃ - T ₂ hours or more. It is sufficient to set the

Note that the time between T ₁ and T ₂ is several mS, and when the engine speed is 800 RPM during idling, the time required for one revolution of the engine is 75 mS, so 10%
There is a certain probability that the ignition coil will misfire, but the engine will rotate elliptically and will not stop.

In this way, with conventional devices, if the timer circuit malfunctioned, it was difficult to leave the car because you were worried that the engine would not stop, but with this invention, even if the timer circuit malfunctions, the engine will definitely stop idling, so you can leave your car with peace of mind. The original purpose of protecting the turbocharger can also be achieved.

[Brief explanation of the drawing]

Figure 1 is a block diagram of the idling delay device.
Fig. 2 is a block diagram of an idling delay device according to an embodiment of the present invention, and Fig. 3 is an explanatory diagram of the same operation.
In the figure, 2 is an ignition switch, 5 is a timer circuit, and 17 is a protection timer circuit.

Claims (1)

[Scope of Claim for Utility Model Registration] It has a timer circuit and a switch operated by the timer circuit, and even if the ignition switch is opened, the timer circuit keeps the switch closed for a certain period of time to keep the engine idling, In an idling delay device for a car with a turbocharger, which then opens a switch to stop the engine, a certain amount of time is set when the timer circuit malfunctions to prevent the engine from being stopped after a certain period of time due to the malfunction of the timer circuit. An idling delay device for an automobile with a turbocharger, characterized in that a protective timer circuit for opening the switch and stopping the engine after a certain period of time is connected to the switch in parallel with the timer circuit.