JPS6145306Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an exhaust brake release device that automatically releases the exhaust brake when the vehicle is stopped.

As is well known, large vehicles use an exhaust brake device as shown in FIG. In Fig. 1, an intake shutter 1 and an exhaust shutter 2 are each connected to an air cylinder 3.
This air cylinder 3 is connected to an air reservoir 5 via a three-way magnetic valve 4. This 3-way magnetic valve 4
, clutch switch 6, accelerator switch 7
And exhaust brake switch 8 is power supply 9
connected in series. The clutch switch 6 and the accelerator switch 7 are configured to be disconnected from each other when the driver depresses a clutch pedal or an accelerator pedal (not shown).
Further, the exhaust brake switch 8 is configured to be turned on and off as appropriate by manual operation by the driver.

Such an exhaust brake device operates as follows.

That is, when the driver takes his/her foot off the clutch pedal and the accelerator pedal while driving, the clutch switch 6 and the accelerator switch 7 are turned on. Therefore, if the exhaust brake switch 8 is turned on in advance, current flows from the power source 9 to the three-way magnetic valve 4, and the three-way magnetic valve 4 is activated. Air is supplied from the air reservoir 5 to each air cylinder 3 by the operation of the magnetic valve 4, and each air cylinder 3 is operated by this air pressure. 2 respectively close the intake manifold and exhaust manifold in place. Therefore, this activates the exhaust brake and decelerates the vehicle.

However, in the case of such a conventional exhaust brake device, in order to release the exhaust brake when the vehicle is stopped, it is necessary to operate the exhaust brake switch 8 and turn off the power from the power source 9 each time. Therefore, it was complicated. In addition, in cold weather or when the idling is set low, the engine may stall due to activation of the exhaust brake while driving at low speeds.Additionally, due to a mistake, the engine may stall while the exhaust brake is activated while the engine is stopped. This is likely to occur when the vehicle is being driven, and in this case, the deterioration of the engine oil increases, resulting in damage.

For example, Japanese Utility Model Application No. 51-70822 proposes a switch device that opens when the vehicle speed exceeds a certain level and is connected in series with an accelerator switch and a clutch switch.

Although this technology can prevent the exhaust brake from operating when the vehicle is idling or driving at low speeds, for example, when the vehicle is carrying a heavy load and going down a slope at very low speeds, the exhaust brake will not operate even if the vehicle is desired to be used.

Therefore, an object of this invention is to provide an exhaust brake release device that releases the exhaust brake when the vehicle speed is slow, but can also operate the exhaust brake if necessary even when the vehicle speed is slow.

According to the present invention, in order to operate the exhaust brake system of a car, there is a magnetic valve for opening and closing the exhaust brake shutter, a clutch switch that opens when the clutch pedal is depressed, and an accelerator switch that opens when the accelerator pedal is depressed. In an exhaust brake release device having a circuit in which the exhaust brake switch and the exhaust brake switch are connected in series to a power supply, a speed detection switch that closes at a certain vehicle speed or higher is connected in parallel with the exhaust brake switch, and a changeover switch that selects the parallel connection is provided. It is provided.

Therefore, when the selection switch is switched to the speed detection switch side, the exhaust brake is activated when the vehicle speed is above a certain value, but when the vehicle speed is below a certain value, the speed detection switch is turned off and the exhaust brake is released. However, when the selection switch is set to the exhaust brake switch side, the exhaust brake can be released by operating the exhaust brake switch, regardless of the vehicle speed.

Therefore, if you do not want to release the exhaust brake at low vehicle speeds, you can switch the selection switch to the speed detection switch side, and if you want to operate the exhaust brake even at low vehicle speeds, you can switch it to the exhaust brake switch side. The exhaust brake can be activated to match the driving conditions, making driving easier. Usually, a speed indicator light is used in a truck, and when the speed indicator light lights up, a signal is sent to the speed detection switch, and the speed detection switch closes, so the exhaust brake is activated when the speed indicator light lights up. It does not operate at low speeds, the wiring is simple, no special switches or sensors are required, and it is easy to improve current products.

When implementing the present invention, the changeover switch is linked with the exhaust brake switch, such that, for example, when the lever of the exhaust brake switch is in the first position, it is off, in the second position, it is on, and in the third position, the changeover switch is moved to the speed detection switch side. It may be possible to switch.

Next, an embodiment of this invention will be explained with reference to FIG. In FIG. 2, parts corresponding to those in FIG. 1 are designated by the same reference numerals, and their explanation will be omitted.

In FIG. 2, power supply 9 and clutch switch 6
A speed detection switch 10 is connected between the exhaust brake switch 8 and the exhaust brake switch 8 in parallel. Then, the changeover switch 11 is connected to the terminals 11a, 11b, 1
1c, exhaust brake switch 8
It is arranged so that the connection can be switched between the speed detection switch 10 side and the speed detection switch 10 side. This speed detection switch 10 detects speeds higher than a certain speed (for example, 5 km/h).
The speed detector 21 is equipped with a speed detector 21 that opens when the vehicle speed is higher than the above speed and closes when the vehicle speed is higher than that speed.
2a is closed. A speed detection switch 23 is connected to a relay contact 22a of this speed display relay 22, and a speed display lamp 24 is connected in series. Therefore, when the vehicle is not traveling at low speed, the speed detector 21 is closed, and as a result, the speed display lamp 24 is turned on and the vehicle speed detection switch 23 is closed. Since the vehicle speed detection switch 23 is open when the vehicle is running at low speed, no current flows through the changeover switch 11.

Here, the terminals 11a and 11 of the changeover switch 11
If b is connected, the exhaust brake is operated by the driver manually turning on and off the exhaust brake switch 8 in the same manner as in the conventional system. On the other hand, terminals 11a and 11 of the changeover switch 11
If C is connected, if the vehicle is at a certain speed or higher, power can always be applied to the changeover switch 11 from the power source 9 via the speed detection switch 10, and the clutch switch 6 and accelerator switch 7 are turned on. As a result, the exhaust brake operates in a defined manner. However, when the speed of the vehicle falls below a certain speed, the speed detection switch 10 is turned off.
The exhaust brake is released.

As described above, according to this invention, by changing the changeover switch, the exhaust brake can be operated and released depending on the vehicle speed, and at the same time, the exhaust brake can be released regardless of the vehicle speed. Therefore, the exhaust brake can be desirably released on slopes, flat roads, etc., making driving easier.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a conventional exhaust brake release device, and FIG. 2 is an explanatory diagram of the exhaust brake release device of this invention. 2...Exhaust shutter, 1...Intake shutter, 4...Magnetic valve, 6...
Clutch switch, 7... Accelerator switch, 8
... Exhaust brake switch, 9 ... Power supply, 10 ... Speed detection switch, 11 ... Changeover switch.

Claims (1)

[Scope of utility model registration request] In order to operate an automobile's exhaust brake system, there are a magnetic valve for opening and closing the exhaust brake shutter, a clutch switch that opens when the clutch pedal is depressed, a clutch switch that opens when the accelerator pedal is depressed, and an exhaust brake switch. In an exhaust brake release device that has a circuit connected in series to a power source, a speed detection switch is connected in parallel with the exhaust brake switch to a speed display device that flashes a speed indicator light and is closed by an electric current when the vehicle speed exceeds a certain speed. , an exhaust brake release device characterized by being provided with a changeover switch for selecting the parallel connection.