JPS591074Y2 - Diesel engine intake throttle device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an intake throttle valve control device that is operated during idling of a diesel engine.

Recently, diesel vehicles such as diesel passenger cars have been put into practice due to their economic efficiency, but vibrations and noise generated from the diesel engines installed in them have become a major problem.

Particularly during idling, the torque fluctuation within one cycle, that is, the angular velocity, is large, and this is one of the factors that increases vibration.

In view of the above-mentioned points, this proposal throttles the intake air during idling, and also maintains the negative intake pressure at a constant level during intake throttle to prevent an increase in noise and harmful exhaust components due to excessive throttling. It is an object of the present invention to provide an intake throttle device for an easel engine, and an embodiment thereof will be described below with reference to the drawings.

Reference numeral 1 denotes an intake passage of a diesel engine, and an intake throttle section 5 is formed in the middle of the intake passage, which is divided into 1st and 2nd passages 3 and 4 by a partition wall 2.

In the first passage 3, an intake throttle valve 6 is rotatably supported by the wall of the intake throttle section 5 with its shaft 7, and
An arm 8 for operating the throttle valve 6 is provided at one outer end of the
is provided.

9 is a negative pressure responsive actuator, and diaphragm 1
0 into a negative pressure chamber 11 and an atmospheric chamber 12, and the negative pressure chamber 11 is connected to a vacuum pump 1 via an appropriate pipe 13.
4, and a return spring 15 for pressing the diaphragm 10 is disposed inside.

On the other hand, the atmospheric chamber 12 is provided with a suitable hole or opening (not shown) to communicate with the atmosphere, and is also provided with a rod 16 having one end fixed to the diaphragm 10 and the other end extending outward. The outer end of the rod 16 is connected to the arm 8 directly or via a suitable rod or link.

17 is a three-way solenoid valve disposed in the middle of the pipe 13, and is equipped with a negative pressure inlet part 17a, a negative pressure outlet part 17b, and an atmosphere (release) port 17C, and a built-in control valve (not shown). The outlet section 17b is selectively connected (disconnected) to the inlet section 17a and the atmospheric air port 17C by means of (1).

18 is a relay, and its contact 18a is the relay coil 18
The solenoid valve 17 and circuit 1 are closed when b is energized.
9.

On the other hand, the Lou coil 16b is connected by a circuit 21 to the N terminal of a generator 20 driven by the engine, and is excited when the voltage generated by the generator 20 increases as the engine speed increases.

Further, the generator 20 is connected to a battery 22 through its B and E terminals.

Reference numeral 27 denotes a water temperature sensing valve disposed between the solenoid valve 17 and the actuator 9, and the water temperature sensing element portion 28 is installed so as to face inside the water jacket (W) of the cylinder body B of the engine. It opens and closes an internal passage (not explicitly shown) in response to the operation of the

Reference numeral 29 denotes an intake negative pressure control valve provided in the second passage 4, which is rotatably supported by the wall of the intake throttle section 5 with its shaft 30, and the control valve 29 is provided at one outer end of the shaft 30. An arm 31 is provided for operating the.

32 is a negative pressure responsive actuator, which is divided into a negative pressure chamber 34 and an atmospheric chamber 35 with a diaphragm 33 in between, and the negative pressure chamber 34 is connected to the downstream side of the intake throttle section 5 (
engine side) is connected to la, and is always connected to the above downstream side 1
The intake negative pressure taken out from a is applied.

Further, a return spring 37 is disposed in the negative pressure chamber 34 to push the diaphragm 33 to the left in the figure, that is, in a direction to close the control valve 29, against the intake negative pressure.

On the other hand, the atmospheric chamber 35 is provided with a suitable hole or opening (not shown) to communicate with the atmosphere, and is also provided with a rod 3B having one end fixed to the diaphragm 33 and the other end extending outward. The outer end of the rod 38 is connected to the arm 31 directly or via a suitable rod or link mechanism.

Next, the operation of the embodiment of the present device configured as described above will be explained.

First, when the engine is idling at room temperature, the voltage generated by the generator 20 is low, so the relay coil 18b is not activated and the contact 18a is in an open state, and the water temperature sensing valve 27 is also closed through its internal passage. Since the circuit is open, the diaphragm 10 and rod 16 are returned to the negative pressure chamber 11 of the actuator 9 by the action of the vacuum pump 14 and pulled to the right in the figure against the spring 15. 6 is rotated clockwise in the figure to restrict the intake air flow passing through.

Therefore, while the amount of intake air is reduced, the angular velocity fluctuation of the engine and vibration acceleration in the rolling direction are also reduced, and the effect of reducing engine vibration and noise during idling can be obtained.

Furthermore, if the throttle ratio of the intake throttle valve 6 becomes large and the intake negative pressure on the downstream side 1a of the intake throttle section 5 is not increased more than necessary, the negative pressure chamber 34 of the actuator 32 is increased in response to the increase in negative pressure. The same negative pressure is applied to the return spring 3.
7, the diaphragm 33 and the rod 3B are pulled to the right in the figure, and the control valve 29 is rotated clockwise in the figure via the arm 31, increasing its opening. Excessive increase in intake negative pressure is prevented.

Next, even in the same idling operation, at cold start, etc., even if the solenoid valve 17 is open, its internal passage is closed until the water temperature sensing valve 27 reaches the set temperature, so the actuator Since the valve 9 is not operated and the intake throttle valve 6 is kept open, there is no adverse effect on starting the engine.

Furthermore, regardless of whether the engine is running at room temperature or cold starting, when the engine is in an operating state other than idling, the generator 20
Since the generated voltage increases, the relay coil 18b is energized and closes the contact 18a.

Therefore, the solenoid valve 17 works to disconnect the negative pressure outlet part 17b from the negative pressure inlet part 15a and connect it to the atmosphere port 17C, so the operation of the actuator 9 is stopped and the intake throttle valve 6 returns to the open position. do.

Therefore, the intake throttle in the first passage 3 is released.

Therefore, during normal driving of the vehicle other than idling, there will be no deterioration in performance such as a decrease in engine output.

Further, along with the reduction in vibration during idling of the engine as described above, there is an effect that vehicle body vibration and shift lever vibration are also reduced.

[Brief explanation of drawings]

The figure is a schematic system diagram showing an embodiment of the present invention. 1: Intake path, 2; Partition wall, 3; First passage, 4; Second passage, 5; Intake throttle section, 6; Intake throttle valve, 9; Actuator, 14; Vacuum pump, 17; Three-way solenoid valve, 1
B; Relay, 20; Generator, 22; Battery, 2
4; water temperature sensing valve, 32; actuator

Claims (1)

[Scope of utility model registration request] In the middle of the intake passage, an intake throttle part is formed which is divided into a first and second passage by a partition wall, and an intake throttle valve is provided in the first passage to throttle the intake air during idling operation, and an intake throttle is provided in the second passage. In a diesel engine intake throttle device that is equipped with intake negative pressure control valves that maintain a constant intake negative pressure downstream of the engine, the intake throttle valves are controlled by introducing negative pressure from a vacuum pump. A responsive actuator is used to force the valve to operate in the closing direction, and a solenoid valve connected to a relay that detects the voltage generated by the generator and operates in the middle of the pipe connecting the vacuum pump and the actuator is installed to cool the engine. An air intake throttle device for a diesel engine characterized by being equipped with a water temperature sensing valve that detects the set temperature of water and closes the valve.