JP5772178B2 - Vehicle engine oil supply device - Google Patents

Description

  The present invention relates to an engine oil supply device for a vehicle that can increase the demand for engine oil without deteriorating fuel consumption.

  In a vehicle equipped with an engine, engine oil is circulated for the purpose of lubricating and cooling the engine and transmission. As shown in FIG. 3, the engine oil supply device 31 includes an oil pump 2 that pumps engine oil and engine oil supply paths 4 a and 4 b to a plurality of customers 3 a and 3 b where the engine oil is used. .

  Since the engine oil is pumped by the oil pump 2, the oil pressure of the engine oil can be used in addition to lubrication and cooling. Various auxiliary machines can be driven by a hydraulic actuator that uses the hydraulic pressure of engine oil.

  For example, in a large vehicle, an auxiliary brake is indispensable in addition to the main brake, but the auxiliary brake has a timing different from the timing at which the camshaft gives the exhaust valve (specifically, the crank angle is near the compression top dead center) There is a compression release brake that forcibly opens the valve at the same timing. The forced valve opening mechanism that forcibly opens the exhaust valve when the compression release brake is performed is configured as a hydraulic actuator that uses the oil pressure of the engine oil.

  In recent years, a compression release brake has been required to ensure the safety of large vehicles.

JP-A-10-266879

  By the way, in a vehicle, in order to improve fuel consumption, reduction of all the friction in a vehicle is calculated | required. Of course, the oil pump 2 is also required to reduce friction.

  However, in a vehicle equipped with a forced valve opening mechanism so that a compression release brake is possible, the oil pump 2 is used as much as the engine oil is consumed by the forced valve opening mechanism compared to a vehicle not equipped with the forced valve opening mechanism. The amount of oil to be pumped increases. In order to increase the amount of oil to be pumped, the number of oil pumps 2 is increased or the size of the oil pump 2 is increased. However, if the amount of oil pumped in this way is increased, Friction in the pump 2 increases, resulting in deterioration of fuel consumption.

  Not only the forced valve opening mechanism, but if the demand for engine oil increases, the same result will be brought about. That is, as shown in FIG. 4, when a new customer 3c is added to the engine oil supply device 31, the amount of oil to be pumped increases, so that the capacity of the oil pump 2 needs to be increased, and the fuel consumption deteriorates.

  Accordingly, an object of the present invention is to provide an engine oil supply device for a vehicle that solves the above-described problems and can increase the demand for engine oil without deteriorating fuel consumption.

In order to achieve the above object, an engine oil supply device for a vehicle according to the present invention is branched from an oil pump for pumping engine oil and a main supply passage connected to the oil pump, and an exhaust valve is forced by the oil pressure of the engine oil. A first supply path for supplying engine oil to a forced valve opening mechanism that opens and operates the compression release brake, and an oil jet nozzle that branches from the main supply path connected to the oil pump and blows engine oil to the piston A second supply path for supplying engine oil; a first solenoid valve for opening / closing the first supply path; a second solenoid valve for opening / closing the second supply path; the first solenoid valve; And a controller that controls switching of the opening and closing of the second solenoid valve. The controller determines whether the vehicle is decelerating or coasting, and the vehicle decelerates. There When it is determined that the state in which coasting, by opening the first supply passage, causes prepare engine oil supply to the forced opening mechanism before actuation of the compression release brake, the When it is determined that the second supply path is shut off and the vehicle is neither decelerating nor coasting, the oil is discharged before the vehicle state becomes a high load operation state by opening the second supply path. The engine oil supply to the jet nozzle is prepared and the first supply path is shut off .

The forced valve opening mechanism forcibly opens the exhaust valve by hydraulic pressure of engine oil when the compression release brake is operated in a state where the first supply path is open, and the oil jet nozzle In a state where the second supply path is open, engine oil is sprayed onto the piston during high load operation of the vehicle .

  The present invention exhibits the following excellent effects.

  (1) It is possible to increase the demand for engine oil without deteriorating fuel consumption.

It is a lineblock diagram of an engine oil supply device showing one embodiment of the present invention. It is a flowchart which shows operation | movement of the vehicle carrying the engine oil supply apparatus of this invention. It is a block diagram of the conventional engine oil supply apparatus. It is a block diagram of the conventional engine oil supply apparatus with which the new customer was added.

  Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

  As shown in FIG. 1, an engine oil supply device 1 according to the present invention includes an oil pump 2 that pumps engine oil and a plurality of customers 3a, 3b, and 3c that need to supply engine oil according to vehicle conditions. When the engine oil supply path 4a, 4b, 4c to the vehicle is in a vehicle state that requires engine oil supply at a certain customer 3c, the engine oil to other customer 3b that does not require engine oil supply in that vehicle state Switching means 5 is provided that shuts off supply path 4b and opens engine oil supply path 4c to customer 3c that needs to supply engine oil.

  A relief valve 7 is connected to the main supply path 6 from the oil pump 2 to each engine oil supply path 4a, 4b, 4c. The relief valve 7 is a conventional one. When the oil pressure in the main supply path 6 exceeds a set value, the engine oil in the main supply path 6 flows out to the oil pan 8. Since the oil discharge amount of the oil pump 2 depends on the engine rotation speed, the oil pressure becomes excessively high and the friction of the oil pump 2 increases at the time of high engine rotation. However, when the engine oil escapes from the relief valve 7, The pressure does not exceed the set value and the friction does not increase.

  Here, a cylinder head 3a, an oil jet nozzle 3b that blows engine oil onto a piston, and a forced valve opening mechanism 3c that forcibly opens an exhaust valve by the oil pressure of the engine oil are taken as examples of the demand for engine oil.

  The engine oil is always supplied to the cylinder head 3a regardless of whether or not there is a load during engine operation. The engine oil supplied to the cylinder head 3a is dripped and collected in the oil pan 8 after working for lubrication and cooling of the valve operating system.

  The oil jet nozzle 3b cools the piston by spraying engine oil on the back surface of the piston. The engine oil sprayed on the back surface of the piston is dropped and collected in the oil pan 8 after cooling the piston.

  Conventionally, engine oil is always injected from the oil jet nozzle 3b regardless of whether there is a load or not during engine operation. On the other hand, in the present invention, when the engine is operating at a high load, such as when the vehicle is accelerating or climbing, engine oil is injected from the oil jet nozzle 3b, so that the vehicle is decelerated or the engine is operated at a low load. The engine oil is controlled not to be injected from the oil jet nozzle 3b when the engine is in operation.

  The forced valve opening mechanism 3c is for forcibly opening the exhaust valve in the vicinity of the compression top dead center of the crank angle in order to operate the compression release brake. Although details of the forced valve opening mechanism 3c are not shown, the exhaust valve is stroked by supplying and discharging engine oil to and from the hydraulic cylinder. Engine oil discharged from the hydraulic cylinder is collected in the oil pan 8 through a low-pressure engine oil discharge path (not shown).

  Here, considering the vehicle conditions that require engine oil supply for the three customers 3a, 3b, and 3c, the cylinder head 3a operates the valve system when the engine is operating. Supply is required. The oil jet nozzle 3b requires an engine oil supply because the piston becomes hot when the engine is in a high load operation, but an engine oil supply is not necessary when the engine is in a low load operation. The forced valve opening mechanism 3c needs to supply engine oil only when a compression release brake is used to decelerate the vehicle strongly.

  From the above examination, it can be seen that the oil jet nozzle 3b and the forced valve opening mechanism 3c do not coincide with each other in the vehicle state that requires engine oil supply. In other words, during engine high-load operation that requires engine oil supply to the oil jet nozzle 3b, compression that requires engine oil supply to the forced valve opening mechanism 3c is not necessary. When the brake is released, it is not necessary to supply engine oil to the oil jet nozzle 3b.

  Thus, the switching means 5 opens and shuts off the engine oil supply path 4c to the forced valve opening mechanism 3c and the second electromagnetic valve opens and shuts off the engine oil supply path 4b to the oil jet nozzle 3b. It comprises a valve 52 and a control unit 53 that switches and controls these solenoid valves. The control unit 53 is preferably installed as software in an electronic control unit (ECU).

  The switching means 5 shuts off the engine oil supply path 4c to the forced valve opening mechanism 3c during high load operation and opens the engine oil supply path 4b to the oil jet nozzle 3b. The engine oil supply path 4b to 3b is shut off, and the engine oil supply path 4c to the forced valve opening mechanism 3c is opened.

  Hereinafter, the operation of the engine oil supply apparatus 1 will be described with reference to FIG.

  Now, it is assumed that the vehicle is shifting to steady running after the engine is driven at a high load due to acceleration running. At this time, the first solenoid valve 51 blocks the engine oil supply path 4c, and the second solenoid valve 52 opens the engine oil supply path 4b.

  In step S1, the control unit 53 of the switching unit 5 determines whether or not the fuel injection amount is 0 while the vehicle is traveling. This determination is to check whether the vehicle is decelerating or coasting. If the determination result is NO, the controller 53 recognizes that the vehicle is not decelerated or coasted, and the control unit 53 maintains the current switching state, and the operation of the vehicle proceeds to return. If the determination result is YES, the control unit 53 recognizes that the vehicle is decelerating or coasting, and proceeds to step S2.

  In step S2, the control unit 53 causes the first electromagnetic valve 51 to open the engine oil supply path 4c and causes the second electromagnetic valve 52 to block the engine oil supply path 4b. Thereby, the engine oil supply to the forced valve opening mechanism 3c is prepared, and the engine oil supply to the oil jet nozzle 3b becomes impossible.

  The operation of the vehicle proceeds to step S3. If the compression release brake is activated in this state, the operation of the vehicle proceeds to step S4. When the compression release brake is not activated, the operation of the vehicle proceeds to step S5.

  When the compression release brake is operated as in step S4, the engine oil is supplied to and discharged from the hydraulic cylinder of the forced valve opening mechanism 3c at the timing when the crank angle is in the vicinity of the compression top dead center, and the exhaust valve is forcibly opened. The operation of the compression release brake is as follows. When the compression release brake switch is turned on in a vehicle equipped with a compression release brake switch, the foot brake is strongly depressed in a vehicle equipped with a foot brake stroke amount (or speed, acceleration) sensor. This is done when it is detected that a rare event has occurred.

  When the compression release brake is not operated as in step S5, the engine oil is extracted by the relief operation of the relief valve 7 when the oil pressure exceeds the set value. Thereby, the driving force of the oil pump 2 is reduced.

  Even when the compression release brake is in operation, if the crank angle is not near the compression top dead center, engine oil is not consumed by the forced valve opening mechanism 3c. Therefore, when the oil pressure exceeds the set value, the relief valve 7 work.

  Although not shown in the drawing, if the fuel injection amount is not zero thereafter, the vehicle is not decelerated or coasted, so the control unit 53 of the switching means 5 shuts off the engine oil supply path 4c to the first electromagnetic valve 51. The engine oil supply path 4b is opened by the second solenoid valve 52. As a result, the engine oil supply to the forced valve opening mechanism 3c becomes impossible, and the engine oil supply to the oil jet nozzle 3b is prepared. Therefore, as soon as the vehicle state changes to high load operation, oil spraying from the oil jet nozzle 3b to the piston back surface can be started.

  As described above, according to the engine oil supply device 1 of the present invention, when a certain customer 3c enters a vehicle state that requires the supply of engine oil, another customer that does not need the engine oil supply in that vehicle state. The engine oil supply path 4b to 3b is shut off, and the engine oil supply path 4c to the customer 3c that needs to supply the engine oil is opened, so that the amount of oil pumped by the oil pump 2 is always required. In addition, it is not necessary to cover both of the demand destinations 3b and 3c, and it is sufficient if one (the more) is satisfied. Therefore, even when a new customer 3c is added to the configuration having the customers 3a and 3b, the increase in the amount of oil to be pumped is suppressed, and the friction in the oil pump 2 does not increase, so the fuel efficiency does not deteriorate.

  In the present embodiment, the cylinder head 3a, the oil jet nozzle 3b, and the forced valve opening mechanism 3c have been described as engine oil demand destinations, but the engine oil demand destination is not limited to this. In addition to existing customers, new hydraulic actuators, energy accumulators that store hydraulic energy, mechanisms that require lubrication and cooling, and so on are engine oil customers. If there is a combination where the vehicle states that require engine oil supply do not coincide with each other at such a plurality of demand destinations, it becomes a switching target as in the combination of the oil jet nozzle 3b and the forced valve opening mechanism 3c of the present embodiment.

  For example, oil injection is conventionally performed in a transmission for the purpose of gear lubrication and cooling, but when the load torque of the transmission is small, heat generation of the gear may be small, so oil injection in the transmission may be stopped. That is, when the vehicle is coasting, when the engine is lightly loaded, or when the vehicle is decelerated (including when the engine is braked), the load torque of the transmission is smaller than that during acceleration of the vehicle. Oil supply is no longer necessary. Therefore, if there is another demand destination that needs engine oil supply only in these vehicle states, it is a target for switching.

  In the present embodiment, the forced valve opening mechanism 3c forcibly opens the exhaust valve. However, the forced valve opening mechanism 3c is not limited to the exhaust valve and may forcibly open the intake valve. The forced valve opening mechanism 3c can be used for other than the compression release brake because the intake valve and the exhaust valve can be forcibly opened at a desired timing other than the timing determined by the camshaft. Depending on the purpose of use, the vehicle condition that requires engine oil supply to the forced valve opening mechanism 3c differs, but there are other customers that need engine oil supply only in vehicle conditions that do not require engine oil supply to the forced valve opening mechanism 3c. If there is, it becomes the target of switching.

  In the present embodiment, the state of the vehicle is determined based on whether the fuel injection amount is 0, but the parameters used for the determination are not limited to this. For example, it is possible to determine when the vehicle is decelerated from the vehicle speed, and it is also possible to determine from the accelerator, foot brake, and the like.

1 Engine oil supply device 2 Oil pump 3a Customer (cylinder head)
3b Customers (oil jet nozzles)
3c Customers (forced valve opening mechanism)
4a, 4b, 4c Engine oil supply path 5 Switching means

Claims (2)

An oil pump that pumps engine oil,
A first supply path that branches off from a main supply path connected to the oil pump and supplies engine oil to a forced valve opening mechanism that forcibly opens an exhaust valve by hydraulic pressure of the engine oil and operates a compression release brake;
A second supply passage that branches off from a main supply passage connected to the oil pump and supplies engine oil to an oil jet nozzle that blows engine oil onto a piston;
A first solenoid valve that opens and shuts off the first supply path;
A second solenoid valve for opening and closing the second supply path;
A control unit that switches and controls opening and closing of the first solenoid valve and the second solenoid valve,
The controller determines whether or not the vehicle is decelerating or coasting, and when it is determined that the vehicle is decelerating or coasting, the control unit opens the first supply path to thereby reduce the compression. When the engine oil supply to the forced valve opening mechanism is prepared before the release brake is operated , the second supply path is shut off, and it is determined that the vehicle is not decelerated or coasted, the second By opening the supply path, the engine oil supply to the oil jet nozzle is prepared and the first supply path is shut off before the vehicle state becomes a high-load operation state. Oil supply device. The forced valve opening mechanism forcibly opens the exhaust valve by hydraulic pressure of engine oil when the compression release brake is operated in a state where the first supply path is open,
2. The engine oil supply device for a vehicle according to claim 1 , wherein the oil jet nozzle sprays engine oil to the piston during high load operation of the vehicle in a state where the second supply path is open . 3.

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