JPS624660Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a control device for an engine having both an exhaust brake device and an idling up device, which deactivates the idling up device when the exhaust brake is used.

In vehicles equipped with a car cooler that is directly connected to the driving engine, the idling speed is reduced to prevent insufficient cooling capacity or insufficient electromotive force of the alternator due to a relative increase in current consumption when the engine speed is low. Some are equipped with an idle-up device to increase speed.

On the other hand, it is well known that large vehicles are generally equipped with an exhaust brake device that increases braking force by installing an exhaust shutter in the exhaust passage and closing the shutter when the engine brake is activated, thereby operating the engine as a compressor. be.

However, in conventional vehicles equipped with the above-mentioned idling up device and exhaust brake device, both devices are configured to operate independently and unrelated to each other, so if both devices operate at the same time, the following will occur. This will cause problems.

In other words, at the idling position of the fuel injection amount control member.
The exhaust brake turn switch, which is turned on, does not turn on reliably at the idling up position (hereinafter referred to as the high idling position), resulting in malfunction of the exhaust brake device. On the other hand, in the high idling position, the engine output increases as the fuel injection amount increases, so if the exhaust brake is activated in this state, the braking force will significantly decrease, resulting in a decrease in safety. The pressure may rise abnormally, leading to decreased durability and failure of the shutter and exhaust pipe system.

The present invention was devised in view of these conventional drawbacks, and is configured so that the operation of the idling up device is automatically canceled when the exhaust brake is operated.
Accordingly, it is an object of the present invention to provide an idling-up control device for an engine equipped with an exhaust brake device, which prevents malfunction of the exhaust brake device and insufficient braking force, and prevents a decrease in durability and failure of the exhaust system.

Therefore, in the present invention, an electromagnetic valve that operates to detect the operation signal of the exhaust brake device and release the operation of the idling up device is interposed in the fluid pressure supply path to the fluid pressure actuator.

The present invention will be described in detail below based on illustrated embodiments.

In FIG. 1 showing one embodiment, the exhaust brake device is constructed as follows. That is, a normally open exhaust shutter 2 is interposed in the engine exhaust passage 1, and the shutter 2 is operated by the extension stroke of an air cylinder 3 connected via a lever (not shown) outside the exhaust passage 1. It is configured to be folded and closed.

The air cylinder 3 is connected to an air reservoir 6 via an air pipe 5 in which a normally closed electromagnetic valve 4 is interposed.

The electromagnetic valve 4 opens when energized, high-pressure air in the air reservoir 6 is supplied to the air cylinder 3 via the air pipe 5, and the exhaust shutter 2 is closed by the air cylinder 3 extended stroke. There is. On the other hand, when the electromagnetic valve 4 is de-energized, the valve 4 closes the air pipe 5 and opens the air pipe 5 from the valve 4 to the air cylinder 3 to the relief port.
By discharging the compressed air in the air cylinder 3 into the atmosphere, the air cylinder 3 is caused to shorten its stroke by a built-in return spring, and the exhaust shutter 2 is opened.

The energizing circuit for the electromagnetic valve 4, that is, the exhaust brake operating circuit is constructed as follows. That is, it is attached to the electromagnetic coil of the electromagnetic valve 4, the clutch switch 7 which turns ON when the clutch is connected (when the clutch pedal is released), and the fuel injection pump, and when the control lever 8 is in the idling position (low idling position), the control lever 8 is turned on. A turn switch 9 that is turned on when pressed by an attached push rod 8a, and a solenoid valve 10 that is installed in a fluid pressure supply circuit of an idling up device to be described later and discharges compressed air in the actuator to the atmosphere when energized. It consists of a circuit connected to a battery 12 via an exhaust brake switch 11 in series. or,
A pilot lamp 17 is connected in parallel between the turn switch 9 and the electromagnetic valve 10.

On the other hand, the idling up device is constructed as follows. That is, the control lever 8
An air cylinder 13 is provided to move the idling position of the engine from the normal low idling position to the high idling position (sequentially indicated as LI and HI in FIG. 2) during the extension stroke.
3 is connected to the air reservoir 6 via an air pipe 15 having a normally closed electromagnetic valve 14 and a normally open electromagnetic valve 10 interposed therebetween.

The air cylinder 13 and the electromagnetic valve 14 are of the same type as the exhaust brake device, and are opened when energized to cause the air cylinder to extend its stroke, and when energized is cut off, the air inside the air cylinder 13 is exhausted and the air cylinder is closed. 13 is designed to shorten the stroke.

The energizing circuit for the electromagnetic valve 14, that is, the idling-up operating circuit, is comprised of a circuit connected to the battery 12 via a cooler operating switch 16.

Next, the operation of this configuration will be explained.

When not using the exhaust brake, that is, switch 11
When the cooler is used when the cooler operation switch 16 is turned OFF, the solenoid valve 14 is energized and opened, and the air cylinder 13 is extended and the control lever 8 is moved as shown in FIG. Moved to high idling position. Therefore, the idling rotational speed is increased, which prevents a decrease in the cooling capacity of the cooler, and allows the alternator to generate sufficient electromotive force to cope with the large power consumption due to the use of the cooler.

On the other hand, when using the exhaust brake from this state, turn on the exhaust brake switch 11 and release the accelerator pedal and clutch pedal.

At this time, first, the electromagnetic valve 10 is energized, the air piping 15 is closed, and the air piping 15 from the valve 10 to the air cylinder 13 is opened to the relief port to discharge the compressed air in the air cylinder 13 into the atmosphere. Yotsutte air cylinder 13
makes a shortened stroke. Therefore, when the accelerator pedal is released, the control lever 8 is returned to the low idling position by the biasing force of the return spring, and the fuel injection amount is reduced to a very small amount. At the same time, the rod 8a attached to the control lever 8 presses the contact point of the turn switch 9 by rotationally moving the lever 8 to the low idling position, turning it on.

Therefore, the exhaust brake switch 11, turn switch 9, and clutch switch 7 are all turned on and the solenoid valve 4 is opened, so high pressure air is supplied to the air cylinder 3, and its extension stroke causes the exhaust shutter 2 to open. Closed.

In this way, the fuel injection amount is reduced to the low idling position and the exhaust shutter 2 is closed, thereby providing a normal exhaust brake function.

In this embodiment, since the electromagnetic valve 10 is connected in series with the pilot lamp 17, the electromagnetic valve 4
In other words, the exhaust brake switch 11 is turned on and off regardless of whether the exhaust brake is activated or deactivated.
Just by turning ON, the solenoid valve 10 is energized,
The idling up device is deactivated.

On the other hand, as shown in FIG. 3, the solenoid valve 10 may be connected in parallel with the pilot lamp 17. In this case, the exhaust brake switch 11, turn switch 9, and clutch switch 7 are all turned ON. In other words, the idling up device is deactivated only when the electromagnetic valve 4 is energized and the exhaust brake is actually operated. However, in this configuration, the turn switch 9 naturally needs to have the function of being kept in the ON state from the low idling position to the high idling position of the control lever 8.

In the first embodiment, it goes without saying that the turn switch 9 may be replaced by an accelerator switch that is turned ON only when the accelerator pedal is released.

As explained above, according to the present invention, in an engine that has both an exhaust brake device and an idling up device, the idling up device detects the operation signal of the exhaust brake device and connects the electromagnetic valve that releases the operation of the idling up device. When the exhaust brake is operated, the idling up device is deactivated, the fuel injection amount is always maintained at the low idling position, and the exhaust brake is operated normally, so both devices are activated at the same time. Malfunction of exhaust brake,
Insufficient braking power, reduced durability of the exhaust system, and failures can all be prevented.

Moreover, it can be implemented at low cost with an extremely simple configuration that only requires a solenoid valve.

[Brief explanation of drawings]

FIG. 1 is an overall configuration diagram showing one embodiment of the present invention;
FIG. 2 is a partially enlarged view of the same embodiment as the above when the idling up device is activated, and FIG. 3 is a schematic circuit diagram showing another embodiment of the present invention. 1... Exhaust passage, 2... Exhaust shutter, 3... Air cylinder, 4... Solenoid valve, 5
...Air piping, 6...Air reservoir, 7...Clutch switch, 8...Control lever, 9...
...Turn switch, 10...Solenoid valve, 11...
...Exhaust brake switch, 12...Battery, 1
3...Air cylinder, 14...Solenoid valve, 15
...Air piping, 16...Cooler operation switch.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) An exhaust brake device configured to close an exhaust shutter installed in an exhaust passage when an engine brake is operated, and a fluid actuator that controls the idling position of a fuel injection amount control member. In an engine equipped with an idling-up device configured to forcibly move to an injection amount increasing position through the operation of 1. An idling-up control device for an engine with an exhaust brake device, comprising an electromagnetic valve configured to detect and release fluid pressure in a fluid pressure supply path. (2) The idling-up control device for an engine with an exhaust brake device according to claim 1, wherein the electromagnetic valve operates by detecting only the connection of the operating switch of the exhaust brake device. (3) The idling-up control device for an engine with an exhaust brake device according to claim 1, wherein the electromagnetic valve is activated by detecting a state in which the exhaust brake device is activated.