JPH10299450A - Pcv system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a PCV system to improve the efficient of collection of oil mist contained in blowby gas and prevent freezing of a moisture content in the collected blowby gas. SOLUTION: A PCV system 10 is arranged in a blowby gas passage 52 to intercommunicate a space 511 in a cylinder head cover 51 and an intake passage. The PCV system comprises a PCV room 11 wherein partition plates 12 are protruded alternately from surfaces 131 and 132 positioned facing each other such that passing blowby gas is zigzagged; a temperature deciding means (a temperature sensor 21) to detect or decide the temperature state of an engine; and a temperature control means (a Peltier element 31) for both cooling and heating to cool or heat passing blowby gas. The temperature control means 31 controls temperature based on an output signal from the temperature deciding means 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a ventilating system for ventilating a crankcase.
CV (Positive Crackcase Ven)
(tilation) system.

[0002]

2. Description of the Related Art Blow-by gas leaking from the combustion chamber of an engine into a crankcase through a gap between a piston and a cylinder wall causes air pollution if released to the atmosphere. Therefore, the blow-by gas is reduced and burned in the combustion chamber. (PCV system). That is, as shown in FIG. 2, the blow-by gas 81 indicated by an arrow that has leaked from the combustion chamber 91 to the inside and has again leaked to the upper part of the crankcase 92 passes through the PCV room 93 and the blow-by gas passage 94 and passes through the intake pipe 96 From the combustion chamber 91. In the figure, reference numeral 95 is a piston, and reference numeral 97 is a throttle valve.

[0003] In the PCV room 93, oil mist contained in the blow-by gas 81 is condensed and repaired so that the amount of engine oil burned in the combustion chamber is reduced as much as possible. Therefore, as shown in FIG. 3, the partition plate 935 is placed on the opposite surface 9 of the PCV room 93.
The blow-by gas 81, which protrudes alternately at 31 and 932, is bent and meandered and dropped on the bottom.

[0004]

[Problems to be solved] However, the conventional P
The CV system has the following problems. The first problem is that the amount of oil consumed by combustion in the combustion chamber is large because the collection rate of engine oil is insufficient. In particular, when the temperature of the engine is high, the setting rate of the oil decreases, and the collection rate by the partition plate 935 decreases.

[0005] The second problem is that when the temperature is significantly reduced in a cold region or the like, a small amount of moisture contained in the blow-by gas condenses in the PCV room, the blow-by gas passage is narrowed, and problems such as oil blowout occur. Also occurs.

The present invention has been made in view of such a conventional problem, and can improve the collection rate of oil mist contained in the blow-by gas, and can prevent the moisture in the blow-by gas from freezing. It is an object of the present invention to provide a PCV system which does not decompress and does not cause problems such as gas blowing due to blow-out of an oil or a sealant due to an increase in the flow speed of blow-by gas.

[0007]

The present invention relates to a PCV system provided in a blow-by gas passage for communicating a space in a cylinder head cover with an intake passage downstream of a throttle valve, wherein a partition plate is formed so as to make the passing blow-by gas meander and meander. PCV room protruding alternately on the opposite surface,
A temperature determining means for detecting or determining a temperature condition of the engine; and a temperature controlling means for cooling and heating for cooling or heating the passing blow-by gas, wherein the temperature controlling means is based on an output signal of the temperature determining means. The PCV system is characterized in that the temperature is controlled by using a PCV system.

[0008] Of particular note in the present invention is that P
Cooling and heating temperature control means for cooling or heating the passing blow-by gas is arranged upstream of the CV room. Since the temperature control means is used for both cooling and heating, when the temperature of the engine is high, the passing blow-by gas is cooled and easily condensed, and the collection rate by the partition plate can be increased. Further, when the temperature is significantly lowered, the PCV room is heated to prevent the moisture in the collected blow-by gas from freezing, and when the moisture is frozen, the moisture can be thawed.

[0009] The temperature control means for cooling and heating is
The cooling means and the heating means can be constituted by separate components. For example, as described in claim 2, a Peltier element and a Peltier element driving means (power supply device) capable of switching the direction of current are provided. By using this, a simple and compact device can be realized. Further, the Peltier element has excellent durability and reliability because it is a thermoelectric element having no moving parts.

[0010] The output section of the temperature control means may be a PC.
It is preferable that the V-room is arranged on the upstream side of the flow of the blow-by gas, and it is particularly preferable that the V-room is arranged at the blow-by gas inflow portion. This is because the effect of cooling and heating the blow-by gas in the PCV room is increased by arranging it in the inflow section.

Further, the temperature determining means can use a water temperature sensor used for controlling the engine in combination. Then, the temperature control means is caused to switch between cooling and heating in response to the detection signal of the water temperature sensor.

As described above, according to the present invention, the collection rate of oil mist contained in the blow-by gas can be increased, and when the moisture in the blow-by gas is frozen, the blow-by gas is thawed. It is possible to provide a PCV system which does not cause a problem such as a gas blowout caused by a blowout of an oil or a sealant due to an increase in the flow velocity.

[0013]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment Example This embodiment is, as shown in FIG.
The PCV system 10 is provided in a blow-by gas passage 52 that communicates a space 511 in the inside with an intake passage downstream of a throttle valve (not shown), and the partition plates 12 alternately face each other so that the blow-by gas passing therethrough is meandered. PCV room 11 protruding from surfaces 131 and 132,
It has a temperature determining means (temperature sensor 21) for detecting or determining the temperature state of the engine, and a temperature control means for cooling and heating for cooling or heating the passing blow-by gas.

The temperature control means includes an output unit 30.
And a controller 32 for driving the Peltier device 31. The controller 32 has a driver (not shown) for driving the Peltier element 31, and controls the current direction and the magnitude of the Peltier element 31 based on the output signal of the temperature determining means (temperature sensor 21). Controls the cooling or heating control mode and its strength. In the figure, the broken line indicates an electrical connection line. Further, the output unit 30 of the temperature control means is arranged in the blow-by gas inflow section in the PCV room 11.

The following is a supplementary explanation for each. P
The CV room 11 has a space 51 in the cylinder head cover.
1 is provided in a blow-by gas passage 52 that communicates with the intake passage, and has a blow-by gas intake port 111 at one end and a blow-by gas discharge port 112 at the other end. The PCV room 1 is located near the intake 111.
The temperature sensor 21 is attached so that the tip protrudes into the inside 1.

In the vicinity of the intake 111,
The honeycomb body 33 of the output section 30 of the temperature control means is attached so as to cover the flow path. The honeycomb body 33 is formed in a honeycomb structure having a large contact area with a blow-by gas in order to increase heat exchange efficiency, and is made of copper, aluminum, or the like having a high thermal conductivity. And the honeycomb body 3
Two Peltier elements 31 electrically connected in parallel are mounted on both sides of the 3, and the thermal output of the Peltier elements 31 is transmitted to the blow-by gas through the honeycomb body 33. The Peltier element 31 is a thermoelectric element that generates heat or absorbs heat depending on the direction of current.

The output signal of the temperature sensor 21 is input to a controller 32, which controls the current direction and the magnitude of the Peltier element 31 according to the temperature condition, thereby controlling the cooling or heating control mode. Control its strength and. That is, when the temperature of the engine is high, the blow-by gas passing therethrough is cooled to increase the trapping rate by the partition plate, and when the temperature drops significantly, the PCV
The room is heated to prevent the collected water from freezing and, if the water is frozen, thaw.

Further, by using the Peltier element 31, a simple and compact device can be realized, and since the Peltier element is a thermoelectric element having no moving parts, it has excellent durability and reliability. The temperature determination means may use an engine water temperature sensor (not shown) in addition to the temperature sensor 21.

[0019]

As described above, according to the present invention, the collection rate of the oil mist contained in the blow-by gas can be increased, and even when the collected water is frozen, the oil is thawed and blown out. P that does not cause problems such as
A CV system can be obtained.

[Brief description of the drawings]

FIG. 1 is a system configuration diagram of a PCV system according to an embodiment.

FIG. 2 is a diagram showing a manner of attaching a PCV system to an engine.

FIG. 3 is a schematic configuration diagram of a conventional PCV.

[Explanation of symbols]

 10. . . 10. PCV system, . . PCV room, 12 . . Partition plate, 21. . . Temperature sensor, 31. . . Peltier device, 51. . . Cylinder head, 52. . . Blow-by gas passage,

Claims (4)

[Claims] 1. A PCV system provided in a blow-by gas passage for communicating a space in a cylinder head cover with an intake passage downstream of a throttle valve, wherein partition plates alternately face each other so as to meander and meander the blow-by gas passing therethrough. A PCV room protruding from the surface, temperature determining means for detecting or determining the temperature condition of the engine, and cooling and heating temperature control means for cooling or heating the blow-by gas passing therethrough. A PCV system, wherein the temperature is controlled based on an output signal of the temperature determining means. 2. The temperature control means according to claim 1,
A PCV system comprising a Peltier device and Peltier device driving means capable of switching a direction of a current. 3. The PCV system according to claim 1, wherein the output section of the temperature control means is arranged at a blow-by gas inflow section in the PCV room. 4. The apparatus according to claim 1, wherein said temperature determining means is a water temperature sensor of an engine, and said temperature control means is adapted to perform cooling or cooling in response to a detection signal of said water temperature sensor. A PCV system for switching heating.