JPH0417730A - Acceleration auxiliary device of engine - Google Patents

Abstract

PURPOSE:To improve the acceleration performance of an engine without deteriorating exhaust gas by driving the turbine provided to an engine crank shaft while the engine is accelerated. CONSTITUTION:A controller 33 controls the switching operation of a solenoid valve 22 so that the high pressure working oil from a hydraulic pump 14 may be accumulated in an accumulator 27 while an engine is not accelerated and the high pressure oil may be flowed from the accumulator 27 and may be jetted from a nozzle 24 while the engine is accelerated. The high pressure oil jetted from this nozzle 24 drives a hydraulic turbine and assists the rotation of an engine 10.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a device for assisting the rotation of an engine during acceleration. More specifically, the present invention relates to an acceleration assist device suitable for diesel engines.

[Prior Art] Turbocharged engines for vehicles have poor responsiveness to accelerator pedal depression, and therefore do not have sufficient acceleration performance when starting or overtaking compared to non-supercharged engines.

In order to solve this problem, the inertial mass of the turbocharger is reduced, the rotation of the intake air compressor is assisted by a supercharger, or an air pump is installed to supply air to the exhaust passage from the engine to the exhaust turbine. Exhaust turbo supercharger auxiliary device that improves acceleration performance by driving an air pump (Japanese Patent Application Laid-Open No.
-301920) etc. have been proposed.

[Problems to be Solved by the Invention] However, in the case of a turbocharged engine, there are certain limits to improving acceleration performance even with the above-mentioned conventional techniques. In addition, in the case of a non-supercharged engine, black smoke, particulates, unburned H
With the improvement of exhaust gas as typified by the reduction of C, engine output has been forced to decrease from low speed range to high speed range.
Due to this, the acceleration performance of the engine cannot be improved.

Increasing the displacement of an engine to improve engine output increases the weight and volume of the engine, which poses a problem in the case of vehicle engines, which makes it difficult to mount the engine in a limited space.

An object of the present invention is to provide an engine acceleration auxiliary device that can improve engine acceleration performance without deteriorating exhaust gas regardless of whether a turbocharger is used or not.

[Means for Solving the Problems] In order to achieve the above object, a first acceleration auxiliary device of the present invention includes an oil tank, a pressure accumulator, and an engine that drives the oil in the oil tank to high pressure to increase the pressure of the oil in the oil tank. a hydraulic pump for storing in a pressure accumulator, a hydraulic turbine for assisting engine rotation fixed to the crankshaft of the engine, a solenoid valve capable of switching high pressure oil into and out of the pressure accumulator, and high pressure flowing out from the pressure accumulator. The vehicle is equipped with a nozzle that spouts oil to drive the hydraulic turbine, and a controller that switches the electromagnetic valve so that the nozzle drives the hydraulic turbine during acceleration.

A second acceleration auxiliary device of the present invention includes a gas turbine fixed to a crankshaft of an engine and driven by exhaust gas, a bypass passage connected to an exhaust passage of the engine via the gas turbine, and a bypass passage connected to the exhaust passage of the engine via the gas turbine; The vehicle includes a switching valve that can switch exhaust gas to flow into the bypass passage, and a controller that switches the switching valve during acceleration.

[Function] In the first acceleration auxiliary device, the controller switches the solenoid valve so that the high pressure oil from the hydraulic pump is stored in the pressure accumulator during non-acceleration, and the high pressure oil flows out from the pressure accumulator and is ejected from the nozzle during acceleration. Control. High-pressure oil ejected from the nozzle drives a hydraulic turbine and assists the rotation of the engine.

In the second acceleration auxiliary device, the controller switches and controls the switching valve so that the exhaust gas flows into the exhaust passage during non-acceleration, and flows into the bypass passage during acceleration. Exhaust energy drives an exhaust turbine to help rotate the engine.

[Example] Next, embodiments of the present invention will be described in detail based on the drawings.

As shown in FIGS. 1 and 2, an engine 1° is a turbocharged engine for a vehicle, and a hydraulic turbine 12 for assisting engine rotation is located near a flywheel 15 at the rear end of a crankshaft 11. Fixed. A gear 13 is fixed to the front end of the crankshaft 11, and a drive gear 16 of a hydraulic pump 14 meshes with the gear 13. Shaft 1 of drive gear 16
An electromagnetic clutch 17 is provided in the middle of 6a. Hydraulic pump 14 is connected to oil tank 19 via suction pipe 18 . A solenoid valve 22 is connected to the discharge pipe 21 of the pump 14, and one discharge port of the solenoid valve 22 has a nozzle 2 directed to the turbine blade of the hydraulic turbine 12 via an oil feed pipe 23.
4 are connected. A pressure accumulator 27 is connected to the other discharge port of the solenoid valve 22 via an oil feed pipe 26 . Pressure accumulator 27
has a piston 29 that can slide in the oil chamber 28 and a compression spring 31 that biases the piston 29 toward the oil chamber 28. The return pipe 32 of the turbine 12 is connected to the hydraulic tank 19 .

33 is a controller consisting of a microcomputer, and the input to the controller 33 is a stroke sensor 36 that detects the amount of depression of the accelerator pedal 34 in this example.
is connected. The output of the controller 33 is connected to the electromagnetic clutch 17 and the electromagnetic valve 22.

The operation of the acceleration assisting device having such a configuration will be explained.

When the accelerator pedal 34 is not depressed and is not accelerating,
The stroke sensor 36 causes the controller 33 to connect the electromagnetic clutch 17 and connect the electromagnetic valve 22 to the discharge pipe 21.
and the oil feed pipe 26 are switched so that they communicate with each other. As a result, when a passenger releases the accelerator pedal 34 while the vehicle is running, the hydraulic pump 14 is activated, and the oil in the hydraulic tank 19 is pressurized by the pump 14 via the suction pipe 18 and discharged into the discharge pipe 21. . Further, the high pressure oil is introduced into the oil chamber 28 of the pressure accumulator 27 through the oil feed pipe 26, displacing the piston 29 against the compression spring 31, and being held at high pressure in the pressure accumulator 27.

During acceleration when the accelerator pedal 34 is depressed, the sensor 3
6, the controller 33 disengages the electromagnetic clutch 17 and switches the electromagnetic valve 22 so that the oil pipe 26 and the oil pipe 23 communicate with each other. As a result, when starting or overtaking, the high pressure oil stored in the pressure accumulator 27 is ejected from the nozzle 24 and drives the hydraulic turbine 12, so the engine 10
Even if the engine is a turbocharged engine, the acceleration response of the engine 10 to depression of the accelerator pedal 34 is improved, fuel supply to the engine can be reduced, and exhaust gas from the engine can be improved. In FIG. 3, the acceleration performance of the engine 10 at the time of starting is shown by a solid line.

The broken line indicates the acceleration performance of an engine of the same type without the device of this embodiment.

4 and 5 show another embodiment of the acceleration assisting device of the present invention. The engine 40 is a non-supercharged engine not equipped with a turbocharger for a vehicle, and a gas turbine 42 for assisting engine rotation is fixed near a flywheel 45 at the rear end of a crankshaft 41. The gas turbine 42 is composed of a Pelton impeller. A bypass passage 44 that passes through a gas turbine 42 is connected to an exhaust passage 43 of the engine 40 . Switching valves 46a and 46b capable of blocking the exhaust passage 43 or the bypass passage 44 are disposed at the branching position and the merging position of the bypass passage 44 of the exhaust passage 43. These switching valves 46a.

46b are driven by electromagnetic solenoids 47a and 47b, respectively, to switch the exhaust gas from the exhaust manifold 48 to flow into either the exhaust passage 43 or the bypass passage 44.

In this example, a stroke sensor 36 that detects the amount of depression of the accelerator pedal 34 is connected to the human power of the controller 49, which is a microcomputer. controller 4
The output of 9 is connected to electromagnetic solenoids 47a and 47b.

The operation of the acceleration assisting device having such a configuration will be explained.

When the accelerator pedal 34 is not depressed and is not accelerating,
The stroke sensor 36 causes the controller 49 to deactivate the electromagnetic solenoids 47a and 47b so that the switching valve 46a blocks the inlet of the bypass passage 44 and the switching valve 46b blocks the outlet of the bypass passage 44, as shown by solid lines in the figure. control. As a result, the exhaust gas is discharged to the atmosphere through the exhaust passage 43 and the muffler 51 without passing through the bypass passage 44.

During acceleration when the accelerator pedal 34 is depressed, the sensor 3
6, the controller 49 operates the solenoids 47a and 47.
b is activated to open the switching valves 46a and 4 as shown by the broken line in the figure.
6b is controlled to block the exhaust passage 43. As a result, the exhaust gas flows into the bypass passage 44, and the exhaust energy drives the gas turbine 42, so that the acceleration performance of the engine 10 in response to the depression of the accelerator pedal 34 is improved, and even without increasing the displacement of the engine, there is a large output is obtained. In FIG. 6, the acceleration performance of the engine 40 is shown by a solid line. The broken line indicates the acceleration performance of a conventional engine of the same type that is not equipped with the device of this embodiment. In Figure 6,
A indicates the characteristics when starting, and B indicates the characteristics when overtaking.

FIG. 7 shows yet another embodiment of the invention. In FIG. 7, the same reference numerals as in FIG. 4 indicate the same parts. The characteristic configuration of this example is that the gas turbine 42 of the previous embodiment is provided at the front end of the crankshaft 41, and the switching valves 46a and 46b are switched by air cylinders 52a and 52b. The gas turbine 42 has the same shape as the turbine of a known turbocharger. Air cylinders 52a, 5
2b is connected to an air tank 54 via an air passage 53. A solenoid valve 56 is provided in the air passage 53.
6 is opened and closed by the control output of the controller 49.

Since the operation of this example is similar to that of the previous embodiment, repeated explanation will be omitted.

In the above example, an accelerator pedal stroke sensor is shown as a means for detecting the acceleration state, but the present invention is not limited to this, and other detection means such as a vehicle speed sensor, an engine rotation sensor, a load sensor, a turbocharger boost pressure sensor, etc. You can also use

Furthermore, the acceleration assisting device of the present invention is not limited to vehicle engines.
It can also be applied to marine engines, stationary engines, etc.

[Effects of the Invention] As described above, according to the present invention, since the turbine provided on the engine crankshaft is driven during acceleration, the response during acceleration of an engine equipped with a turbocharger is improved. For non-supercharged engines, the output can be increased over the entire speed range of engine rotation, and the acceleration performance of the engine can be improved without deteriorating exhaust gas.

[Brief explanation of drawings]

FIG. 1 is a configuration diagram of an acceleration assisting device according to an embodiment of the present invention. FIG. 2 is a sectional view taken along the line ■-■ in FIG. Figure 3 is a characteristic diagram showing its acceleration performance. FIG. 4 is a configuration diagram of an acceleration assisting device according to another embodiment of the present invention. FIG. 5 is a sectional view taken along the line V-V in FIG. 4. FIG. 6 is a characteristic diagram showing its acceleration performance. FIG. 7 is a configuration diagram of yet another embodiment of the acceleration assisting device of the present invention. 10.40: Engine, 11.41: Crankshaft, 12: Hydraulic turbine for engine rotation assistance, 14: Hydraulic pump, 19: Oil tank, 22.56: Solenoid valve, 24: Nozzle, 27: Pressure accumulator, 33. 49: controller, 34: accelerator pedal, 36: stroke sensor, 42 gas turbine, 43: exhaust passage, 44: bypass passage, 46a, 46b: switching valve. Figure 1

Claims (1)

[Scope of Claims] 1) an oil tank, a pressure accumulator, a hydraulic pump driven by an engine to make oil in the oil tank high pressure and store it in the pressure accumulator, and a rotating engine fixed to the crankshaft of the engine. an auxiliary hydraulic turbine; an electromagnetic valve capable of switching the flow of high-pressure oil into and out of the pressure accumulator; a nozzle that ejects high-pressure oil flowing out of the pressure accumulator to drive the hydraulic turbine; An engine acceleration assist device comprising: a controller that switches the electromagnetic valve to drive a hydraulic turbine. 2) a gas turbine fixed to the crankshaft of the engine and driven by exhaust gas; a bypass passage connected to the exhaust passage of the engine via the gas turbine; and a bypass passage so that the exhaust gas flows through the bypass passage. An engine acceleration auxiliary device comprising a switchable switching valve and a controller that switches the switching valve during acceleration.