JPS6111471Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to an engine warm-up device attached to an exhaust brake valve, and more specifically, by providing a bypass passage that communicates the front and rear of the valve, abnormal increases in engine exhaust pressure can be prevented. This invention relates to an engine warm-up operation device attached to an exhaust brake valve, which allows the vehicle to run while performing warm-up operation without causing any problems.

An example of a conventional exhaust brake system will be described with reference to FIG. 1. Reference numeral 1 denotes an exhaust pipe, and exhaust gas is sent through the exhaust pipe 1 along the direction of arrow a. 2
is a valve installed in the pipe line of the exhaust pipe 1 to control the opening and closing of the valve 2. The valve 2 is opened and closed by rotating the valve body 2b via the shaft 2b pivotally supported by the valve body 2a of the valve 2. It is done by doing. Reference numeral 3 denotes an actuator that applies rotational driving force to the valve body 2c, and is provided near the valve body 2a, and the reciprocating motion of a piston (not shown) within the actuator 3 is converted into rotational motion of the shaft 2b. This causes the valve 2 to open and close. Reference numeral 4 designates an electromagnetic valve that controls the flow of pressure fluid from the pressure source 5 and the actuator 3 connected thereto.
A power supply path to the electromagnetic valve 4 is through a drive power source 6, a main switch M, an exhaust brake switch B, a clutch switch C, and an accelerator switch A. Among these switches, clutch switch C is turned on when a clutch (not shown) is in a connected state, and accelerator switch A is turned on when an accelerator pedal (not shown) is released.

Since the conventional device has the above configuration, during normal driving, the exhaust brake switch B is open and the solenoid valve 4 is not energized, so that no pressure fluid is fed to the actuator 3 and the valve is closed. 2 is in an open state. To use the exhaust brake, use the accelerator pedal (not shown).
The exhaust brake switch B, clutch switch C, and accelerator switch A are all closed, the solenoid valve 4 is energized, and pressurized fluid is sent to the actuator 3. It will be done. As a result,
The piston in the actuator 3 is energized and moves, the valve body 2c rotates, and the valve 2 is closed, the flow path of the exhaust gas in the exhaust pipe 1 is cut off, the exhaust pressure rises, and the exhaust brake is applied. It is effective as.

By the way, after starting the engine in winter or in a cold region, it is necessary to warm it up for a while, but warm-up generally takes a long time, so in order to shorten this time, conventional methods such as
As described in the publication, the exhaust brake switch B, clutch switch C, and accelerator switch A
A warm-up switch circuit is separately formed in parallel with each switch, and by closing this warm-up switch circuit, the valve 2 is closed, thereby regulating the exhaust gas discharge. A system has been proposed that uses the engine to warm up the engine. However, with this configuration, if the accelerator pedal is pressed during warm-up to increase the engine speed, the exhaust gas pressure will rise abnormally, which will interfere with engine control, and for this reason, warm-up can only be performed during idling. I couldn't do it. Therefore, the vehicle cannot be started unless warm-up is completed, and it is unavoidable that a considerable amount of time is required from starting the engine to starting the vehicle.

In view of the above points, the present invention aims to provide an engine warm-up device that is attached to the exhaust brake valve and is a simple device that enables the vehicle to run while warming up. An exhaust pipe, a valve provided in the exhaust pipe that opens and closes it via an operating mechanism, a bypass passage that communicates the exhaust pipe in front and behind the valve, and a bypass passage that opens and closes the bypass passage. a bypass passage valve, the bypass passage valve is interlocked with an accelerator pedal, and a warm-up operation switch circuit in which a temperature sensing switch is inserted is connected in parallel to the energizing circuit of the operating mechanism, and A feature of this parallel circuit is that an exhaust brake switch that can be selectively turned on as an exhaust brake contact, a neutral contact, and a warm-up contact is disposed at the power supply side connection portion of the parallel circuit.

The present invention will be described below with reference to the embodiment shown in FIG. 2. Reference numeral 7 denotes a small diameter bypass passage that connects the exhaust pipe 1 in front and behind the valve 2, and this bypass passage 7 includes a bypass passage for opening and closing the exhaust pipe 1. A valve 8 is provided. This bypass passage valve 8
An operating rod (not shown) of the valve body 8a is connected via a cable 11 to a rotating arm 10 that is connected to an accelerator pedal 9 provided on the driver's seat, so that when the accelerator pedal 9 is depressed, In conjunction with this operation, the opening degree of the bypass passage 7 can be automatically and directly adjusted.

E is an exhaust brake switch, which comes into contact with any one of the exhaust brake contact G, the warm-up contact H, and the neutral contact N.
Further, T is a temperature sensing switch installed in the middle of the circuit 12 that connects the solenoid valve 4 side contact of the accelerator switch A and the warm-up operation contact H, and in this embodiment, it is connected to the cooling water thermometer. The cooling water is configured to close when the temperature is below a predetermined temperature.

Since the device of the present invention has the above configuration, in order to perform warm-up operation, it is sufficient to set the exhaust brake switch E to the warm-up operation contact H side. For example, since the temperature sensing switch T is closed, the solenoid valve 4 is energized, and the valve 2 of the exhaust pipe 1 is closed. On the other hand, the bypass passage valve 8 opens and closes in conjunction with the accelerator pedal 9, so if the accelerator pedal 9 is depressed and the engine speed increases, the bypass passage valve 8 opens accordingly, keeping the exhaust gas exhaust pressure approximately constant. can be kept at a value. Therefore, it goes without saying that warm-up operation while idling can be performed in exactly the same way as in the conventional device, and it is also possible to run the vehicle while performing warm-up operation. Note that when the temperature of the cooling water rises above a predetermined value, the temperature sensing switch T opens and the solenoid valve 4 is de-energized.As a result, the valve 2 of the exhaust pipe 1 opens and the state is the same as the normal driving state. becomes.

Therefore, during normal driving without the need for warm-up, the exhaust brake switch E can be set to the neutral contact N side, and as a result, the solenoid valve 4 is de-energized and the valve 2 of the exhaust pipe 1 is It becomes open. On the other hand, the bypass passage valve 8 opens and closes in response to the depression of the accelerator pedal 9, and because it hardly ever stands still while the vehicle is in operation, this part may become stuck due to foreign matter in the exhaust gas, or due to rust. This prevents malfunctions from occurring.

By the way, in order to apply the exhaust brake during normal driving, it is sufficient to set the exhaust brake switch E to the exhaust brake contact G side, and when the pedal force applied to the accelerator pedal 9 is released, the accelerator switch A is closed. Therefore, the solenoid valve 4 is energized and the valve 2 of the exhaust pipe 1 is closed. Further, the return operation of the accelerator pedal 9 closes the bypass passage valve 8, thereby closing the entire exhaust passage of the exhaust pipe 1 and effectively functioning as an exhaust brake.

As described above, in the device of the present invention, the bypass passage valve 8 changes its opening depending on the amount of depression of the accelerator pedal 9 during warm-up driving, so the exhaust gas pressure is maintained approximately constant and does not increase abnormally. Therefore, there is no negative effect on the engine. Furthermore, since the bypass passage valve 8 is directly connected to the accelerator pedal 9, its operational response is extremely good.Furthermore, since the bypass passage valve 8 is always operated except when the exhaust brake is applied, it is difficult to stick and is As a result, good operating conditions can be ensured at all times.

Then, a warm-up operation switch circuit with a temperature sensing switch inserted is connected in parallel to the energizing circuit of the valve operating mechanism, and the power supply side connection part of this parallel circuit has an exhaust brake contact, a neutral contact, and Since an exhaust brake switch that can be selectively turned on is installed at the warm-up contact, it is possible to carry out efficient warm-up operation suitable for the temperature conditions.
After the operation, no operation is required by the driver, and the warm-up operation and exhaust brake operation can be easily switched at any time by selectively turning on the exhaust brake switch.

As described above, according to the present invention, with a simple configuration, it is possible to drive the vehicle while performing warm-up operation.

[Brief explanation of the drawing]

FIG. 1 is a schematic diagram showing a conventional exhaust brake system, and FIG. 2 is a schematic diagram showing an exhaust brake system using an engine warm-up device attached to an exhaust brake valve according to the present invention. 1: exhaust pipe, 2: valve, 7: bypass passage,
8: Bypass passage valve, 9: Accelerator pedal.

Claims (1)

[Scope of utility model registration request] An exhaust pipe, a valve provided in the exhaust pipe and opened and closed via an operating mechanism, a bypass passage communicating the exhaust pipe in front and behind the valve, and a bypass passage valve opening and closing the bypass passage. In addition to interlocking this bypass passage valve with the accelerator pedal, a warm-up switch circuit in which a temperature sensing switch is inserted is connected in parallel to the energizing circuit of the operating mechanism, and the power supply of this parallel circuit is Exhaust brake contact on the side connection,
An engine warm-up operation device characterized in that an exhaust brake switch that can be selectively turned on is provided at a neutral contact point and a warm-up operation contact point.