CN2823564Y

CN2823564Y - Forced ventilator for crankcase of automobile engine

Info

Publication number: CN2823564Y
Application number: CN 200520035157
Authority: CN
Inventors: 赵玲; 张建辉
Original assignee: BYD Co Ltd
Current assignee: BYD Co Ltd
Priority date: 2005-08-09
Filing date: 2005-08-09
Publication date: 2006-10-04
Anticipated expiration: 2015-08-09

Abstract

The utility model discloses a forced ventilation device for a crank case of an automobile engine, which comprises an electric control system ECU of the engine and a pressure sensor of an air inlet manifold, wherein the pressure sensor of an air inlet manifold is connected with the electric control system ECU of the engine. The utility model is characterized in that the utility model also comprises an electromagnetic valve and a pressure sensor of the crank case; one end of the electromagnetic valve is connected with an air cylinder cover hood which is communicated with the crank case, and the other end is connected with the air inlet manifold; the control end of the electromagnetic valve is connected with the ECU of the engine; the pressure sensor of the crank case is arranged on the upper part of an oil and gas separation chamber which is arranged on the air cylinder cover hood of the engine, and is connected with the ECU of the engine through a line bundle. The pressure sensor of the crank case and the pressure sensor of the air inlet manifold are the same sensor. As the utility model uses the solution, an engine management system combines the control on the waste gas quantity of the crankcase with the control on the idling air quantity of the engine, the lose control on the rotation speed of the engine is not caused under some operating conditions and the purpose on accurately controlling the engine is achieved.

Description

Automobile engine crankshaft case forced ventilation device

[technical field]

The utility model relates to a kind of automobile engine crankshaft case forced ventilation device.

[background technique]

General automobile engine crankshaft case ventilation plant, be connected with the preceding air inlet pipeline of valve mechanism cover and throttle body by PCV (positive crankcase ventilation (PCV)) the valve pipeline that is loaded on the crankcase, realization imports engine intake manifold and firing chamber with crankcase waste gas, fresh air with gas handling system imports crankcase simultaneously, the ventilation of crankcase when realizing engine operation.

Shown in Figure 1 is exactly the closed crankcase ventilating system that extensively adopts at present, and it has two air pipelines, and one the tunnel is that PCV (positive crankcase ventilation (PCV)) valve one termination valve mechanism cover communicates with crankcase, and the other end taps into the gas manifold.Another road is the vent hose one termination valve mechanism cover of crankcase, and the other end communicates with the throttle body front end.The joint work of these two air pipelines forms the closed crankcase forced ventilation device.

The PCV valve is a mechanical valve, the size of its switching and flow depends on crankcase and the interior pressure difference of intake manifold that is applied to its both sides, because the continuous variation of engine operating condition, pressure difference in crankcase and the suction tude also can constantly change, the aperture of PCV valve just constantly changes, and the exhaust gas flow of the PCV valve of flowing through also constantly changes.

When engine operation, because the continuous variation of engine operating condition, when particularly anxious acceleration, the anxious deceleration, PCV valve pressure at two ends difference alters a great deal, the flow of the PCV valve of depended on pressure difference control and the crankcase gas leakage of motor have not just matched, because of the waste gas of PCV valve of flowing through will participate in the work of motor, like this may be excessive or too small by the exhaust gas flow of PCV valve, all can influence the control of engine management system to engine operation.And, if improper ventilation in the crankcase can cause that crankcase pressure raises, lubricant oil is oozed out from oil sealing, sealing gasket and oil filler, and cause that easily oil ageing is rotten.

On the other hand, petrol engine is in compression and during the workmanship stroke, and mixed gas in the cylinder and imperfect combustion mixed gas are scurried into crankcase by the gap of gap-clearance of piston rings, piston ring and cylinder wall, and its main component is HC, also have a spot of CO and NOx.These materials all have certain harm to human body, directly are discharged in the atmosphere, pollute the environment.And the gas blowby of crankcase makes the PCV valve dirty or stuck sometimes, causes engine management system out of control to engine speed under some operating mode.Vehicle receipts throttle rear engine rotating speed usually appears in this phenomenon can not fall back to idling speed, but continues at a higher rotating speed, and so not only vehicle oil consumption increases, and vehicle noise increases.On the available engine technical foundation, this rate of fault is higher.

[summary of the invention]

The purpose of this utility model is, overcomes the excessive or too small problem of the exhaust gas flow that passes through the PCV valve that exists in the prior art, and the dirty or stuck problem of PCV valve, and a kind of new automobile engine crankshaft case forced ventilation device is provided.

For achieving the above object, the automobile engine crankshaft case forced ventilation device that the utility model proposes comprises electronic engine management system ECU and intake manifold pressure sensor, described intake manifold pressure sensor links to each other with electronic engine management system ECU, it is characterized in that: also comprise solenoid valve, crankcase pressure sensor, described solenoid valve one termination valve mechanism cover communicates with crankcase, the other end taps into the gas manifold, and its control end then links to each other with Engine ECU; Described crankcase pressure sensor is installed in top, oil gas separation chamber on the engine air cylinder cap shell, links to each other with Engine ECU by wire harness.

According to preferred version of the present utility model, described crankcase pressure sensor is identical sensor with intake manifold pressure sensor.

The vent hose that also comprises crankcase, one termination valve mechanism cover, the other end communicates with the throttle body front end.

Because the utility model has adopted such scheme, allow engine management system pass through electromagnetic valve the crankcase waste gas amount that originally enters into intake manifold by the PCV valve pipeline on the crankcase, valve mechanism cover still keeps to the preceding air inlet pipeline of throttle body, so only needing increases a pressure transducer at crankcase, engine management system is by the pressure transducer pressure (this pressure signal is existing at the engine management system of mechanical type PCV valve work) of the pressure of crankcase and intake manifold as can be known, waste gas enters into the aperture (dutycycle) of the amount of intake manifold by the engine management system control electromagnetic valve, the aperture that any moment engine management system can both change solenoid valve from the pressure difference size of the pressure of the crankcase that obtains and intake manifold reaches the crankcase waste gas amount that control enters engine intake manifold, and timely compensation crankcase waste gas pipeline dirty (influencing piping flow) is to the influence of exhaust gas flow.Engine management system will combine the control of crankcase waste gas amount and control to the engine idle air quantity, can not cause under some operating mode out of control to engine speed, reach the purpose of accurate control motor.

[description of drawings]

Fig. 1 is the closed crankcase ventilating system that extensively adopts in the prior art.

Fig. 2 is the crankcase bleeder schematic representation that the utility model adopts the electronic control solenoid valve.

[embodiment]

As shown in Figure 2, the electronically controlled crankcase bleeder of the utility model is on the basis of above-mentioned closed crankcase ventilating system, boost pressure sensor on crankcase, to measure crankcase pressure and pressure signal to be provided for the ECU of electrical control system for engine, after ECU obtains signal, this pressure signal and air-distributor pressure signal (this pressure signal is existing at the engine management system of mechanical type PCV valve work) are compared, determine pressure difference, control the crankcase solenoid valve that is used for replacing the PCV valve, realize accurate control the crankcase waste gas flow that enters engine intake manifold.

The pressure transducer that increases on crankcase directly uses the sensor with the intake manifold pressure sensor same type, is installed in top, oil gas separation chamber on the engine air cylinder cap shell, links to each other with Engine ECU by wire harness, provides pressure signal to ECU.Because the suction pressure signal that crankcase pressure signal and inlet manifold come out can directly compare from two identical sensors.

New ventilation plant still keeps the vent hose of crankcase, one termination valve mechanism cover, and the other end communicates with the throttle body front end.

The utility model adopts the crankcase ventilation system of electronic control solenoid valve, realization is to the accurate control of the crankcase waste gas flow that enters engine intake manifold, and timely compensation crankcase waste gas pipeline dirty (influencing piping flow) is to the influence of exhaust gas flow, all the time guarantee that motor is under any operating mode, pressure in the crankcase is not more than external atmosphere pressure, the engine failure that minimizing causes because of engine crankshaft ventilation system improves the engine crankshaft ventilation system life-span.

Claims

1, a kind of automobile engine crankshaft case forced ventilation device, comprise electronic engine management system ECU and intake manifold pressure sensor, described intake manifold pressure sensor links to each other with electronic engine management system ECU, it is characterized in that: also comprise solenoid valve, crankcase pressure sensor, described solenoid valve one termination valve mechanism cover communicates with crankcase, the other end taps into the gas manifold, and its control end then links to each other with Engine ECU; Described crankcase pressure sensor is installed in top, oil gas separation chamber on the engine air cylinder cap shell, links to each other with Engine ECU by wire harness.

2, automobile engine crankshaft case forced ventilation device as claimed in claim 1 is characterized in that: described crankcase pressure sensor is identical sensor with intake manifold pressure sensor.

3, automobile engine crankshaft case forced ventilation device as claimed in claim 1 is characterized in that: also comprise the vent hose of crankcase, and one termination valve mechanism cover, the other end communicates with the throttle body front end.