JPH055230Y2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field] The present invention is a turbine that recovers exhaust energy to drive an engine, and performs pumping work by being reversely driven from the engine side to brake the engine. The present invention relates to a turbo compound engine having a turbo compound engine.

[Prior Art] Generally, a turbo compound engine comprises an engine 2 equipped with an exhaust turbocharger 1, as shown in FIG.
In this engine, the exhaust energy utilized for intake supercharging by the turbocharger 1 is further recovered by a turbine 4 disposed in an exhaust passage 3 downstream of the turbocharger 1, and the shaft torque extracted by this turbine 4 is supplied to a clutch shaft 5 of the engine 2, thereby achieving high output of the engine 2. On the other hand, an engine system in which the turbine 4 adds rotational driving force to the engine 2 in addition to intake supercharging in this manner requires a considerable braking capacity.

In recent years, the above-mentioned turbine 4 for exhaust energy recovery has been developed.
An engine system has been proposed that can increase the engine braking force in addition to the conventional foot brake and exhaust brake by driving the engine from the engine 2 side and reversing its rotation to function as a blower that performs pump work. There is. What is shown in the figure is an example, and the turbine 4 is rotated between the turbine 4 and the crankshaft 5 in the forward and reverse directions.
The planetary gear mechanism and clutch absorb the rotational inertia (slip) when switching between forward and reverse rotations and adjust the rotation speed.
By interposing a reversing device 6 consisting of a reduction gear, a fluid coupling, etc., forward and reverse rotation of the turbine 4 and mutual transmission of driving force between the crankshaft 5 and the turbine 4 are achieved. Note that reference numerals 8 and 9 are an operating hydraulic system that controls the reversing device 6 and a cooling hydraulic system that cools heat generated due to slippage and the like during forward/reverse switching.

In addition, this engine system supplies exhaust gas to the turbine 4 in order to drive the engine 2 by driving the turbine 4 in normal rotation (arrow A in the figure), in addition to the normal exhaust passage 3. In order to utilize the intake air for the pumping work of the turbine 4 which functions as a blower, the turbine 4 is
An intake air introduction path 11 (arrow B in the figure) for introducing intake air is provided on the exit side of the engine. This introduction path 11
is controlled to open and close by an on-off valve 12 installed therein, and is designed to supply intake air to the turbine 4 only when the engine is braked (when the turbine is reversed). Further, the exhaust passage 3 is provided with a check valve 13 that closes the check valve when the turbine reverses rotation to restrict backflow of exhaust gas. Furthermore, an exhaust brake valve 14 is provided between the supercharger 1 and the turbine 4 to close the exhaust passage 3 when the exhaust brake is activated.

Furthermore, this system includes a bypass passage 15 for detouring exhaust gas from the turbine 4 (arrow C in the figure), and a bypass valve 16 for controlling the opening of this bypass passage 15.
An exhaust bypass mechanism 17 is provided. This exhaust bypass mechanism 17 is designed to supply exhaust gas to the turbine 4 when the engine 2 is under a low load, instead of increasing the back pressure in the exhaust passage 3, which is useless for the supercharger 1 and, by extension, the engine 2. In consideration of the fact that a large power loss occurs, the exhaust gas is detoured from the turbine 4 under such operating conditions. Note that 24 is a controller that controls the valves 12 to 14, 16, the reversing device 6, and the like.

[Problems to be solved by the invention] By the way, in the above-mentioned engine system, the reversing device 6 and the reversing device 6 that connect the turbine 4 and the crankshaft 5 of the engine 2 and constitute a power transmission system that transmits forward and reverse rotational force. It is important to ensure the reliability of the turbine shaft 7 of the turbine 4, etc., and for this purpose, the hydraulic systems 8 and 9 that supply hydraulic oil and cooling oil to the reversing device 6, and the bearing device (not shown) of the turbine shaft 7 are required. Appropriate management is required. It is desired to devise a safety system that can detect when these devices 6 reach a critical state and avoid unreasonable operation.

[Means for Solving the Problems] The present invention provides detection means for detecting an emergency state of the power transmission system that connects the engine to a turbine that recovers exhaust energy to drive the engine and is reversed to brake the engine. , and display means for notifying an emergency by a signal from the detection means.

[Operation] To describe the operation of the present invention, an emergency state of the power transmission system of the turbine is detected by the detection means,
This detection signal is used to make the user recognize the emergency situation using a display means.

[Embodiment] A preferred embodiment of the present invention will be described below in detail with reference to the accompanying drawings.

The basic configuration is the same as the engine system described above (see FIG. 3). In particular, a power transmission system 18 that connects the engine 2 to a turbine 4 that recovers exhaust energy to drive the engine 2 and is reversed to brake the engine 2 is constructed as shown in FIG.

As shown, the turbine shaft 7 of the turbine 4
An output gear 50 is fixed to the output end of the
The output gear 50 is meshed with planetary gears 19, 19. These planetary gears 19, 19 are meshed with an annular gear 22 which is rotated integrally with an output pump wheel 21b of a fluid coupling 21 equipped with a lockup mechanism 20. That is, the output gear 50 is connected to the fluid coupling 21 by a planetary gear mechanism 23 consisting of planetary gears 19, 19 and an annular gear 22, so as to transmit rotational driving force from the turbine 4 to the output pump wheel 21a of the fluid coupling 21. It is structured as follows.

The output pump car 21a includes this output pump car 2.
A first transmission gear 51 that rotates together with 1a is fixed.

Next, the planetary gear mechanism 25 will be explained.

The planetary gear mechanism 25 is roughly divided into a sun gear shaft 27 having a sun gear 26 fixed to the shaft end of the output pump vehicle 21a, and a plurality of sun gear shafts 27 having equal intervals in the circumferential direction of the sun gear 26 and meshing with the sun gear. planetary gear 2
8, an annular gear 29 having internal teeth that mesh with these planetary gears 28, a carrier 30 of the planetary gear 28 that rotates and revolves the planetary gear 28 around the sun gear 26, and the first transmission gear. A second transmission gear 31 meshed with the second transmission gear 31 and a one-way clutch 32 provided coaxially with the second transmission gear 31 transmit the rotational driving force of the crankshaft gear 34 of the crankshaft 5 to the second transmission gear 31. and a hydraulic clutch means 35 for freeing or fixing the carrier 30.

In this embodiment, the hydraulic clutch means 35 includes a hydraulic clutch 37 which can be connected to a flange portion extending radially outwardly of the carrier 30, that is, a clutch portion 36, and which stops the rotation of the carrier 30 when connected. , a pump 38 that supplies hydraulic oil to the hydraulic clutch 37, and an on-off valve 4 interposed in the hydraulic system 8 that connects the pump 38 and the hydraulic clutch 37.
Consists of 0.

Furthermore, a cooling hydraulic system 9 is connected to the hydraulic clutch 37, which supplies cooling oil to cool down heat generated due to slippage during forward/reverse switching, and a pump 52 pumps the cooling oil.

The power transmission system 18 of the turbine 4 configured in this manner is provided with a detection means for detecting its operating control state. In this embodiment, a first temperature sensor 53 detects the temperature of the cooling oil supplied to the clutch 37, a first pressure sensor 54 detects the oil pressure of the cooling oil, and a first pressure sensor 54 detects the oil pressure of the hydraulic oil. Second pressure sensor 55 and bearing device 5 for turbine shaft 7
A second temperature sensor 57 that detects the lubricating oil temperature at 8 and a gap sensor 56 that detects shaft vibration at the bearing device 58 are provided. The detected values from these sensors 53 to 57 are output to the controller 24, which is a control means, and
4, and display lights 59 to 6 as necessary.
The 1st class display means is turned on.

A turbine brake switch 62 and an accelerator switch 63 are connected to the controller 24, which are turned on at the same time to operate the turbine brake, and when either one is turned off, the turbine brake is released.

Hereinafter, the control in the controller 24 will be referred to as the second
The explanation will follow the control flow shown in the figure.

This controller 24 controls each detection sensor 53 to
Each detected value output from 57 (cooling oil temperature Tc, cooling oil pressure Pc, working oil pressure Pa, vibration value Vb, lubricating oil temperature
Tc ₁ is the set value of the upper and lower two levels for Tb),
Pc ₁ , Pa ₁ , Vb ₁ , Tb ₁ and Tc ₂ , Pc ₂ , Pa ₂ , Vb ₂ ,
Tb ₂ is set, and when any one of the detected values reaches a set value Tc ₁ to Tb ₁ that requires attention, the yellow light 59 is turned on, and any one of the detected values reaches this set value Tc ₂ ~ Tb ₁ is exceeded and the set value Tc ₁ ~ Tb ₂ corresponding to the critical condition is reached, red light 60
It is designed to light up. This indicator light 5
9, 60 lights up, the driver can control the power transmission system 18.
The operating status of the equipment can be monitored. Then, when the driver turns off the turbine brake switch 62 while the red light 60 is on, or when the accelerator switch 63 is turned off even if the switch 62 is on, the braking by the turbine 4 is released. This indication (turbine non-operation) is displayed on the indicator light 61, and the pump 3
8,52 will be stopped.

[Effects of the Invention] In summary, the present invention provides the following excellent effects.

An emergency state of the power transmission system of the turbine can be detected by the detection means, and the emergency state can be recognized by the display means based on the detection signal, so that reliability can be improved.

[Brief explanation of the drawing]

Fig. 1 is a system diagram showing the power transmission system of the turbine of a turbo compound engine according to a preferred embodiment of the present invention, Fig. 2 is a flowchart showing the control flow, and Fig. 3 shows the proposed engine system. It is a system diagram. In the figure, 2 is an engine, 4 is a turbine, 18 is a power transmission system, 53 to 57 are detection means, and 59 to 61 are indicator lights serving as display means.

Claims (1)

[Scope of utility model registration request] a detection means for detecting an emergency state of a power transmission system connecting the engine to a turbine that recovers exhaust energy to drive the engine and is reversed to brake the engine; and a display means for notifying the emergency state by a signal from the detection means. A turbo compound engine characterized by: