JPH0454218A - Control device for twin-turbo charger - Google Patents

Abstract

PURPOSE:To effectively retrieve power and to save power consumption during supercharging by arranging two turbochargers having large and small capacities, by driving a rotary electric machine disposed in the small capacity turbocharger for generator operation or motor operation. CONSTITUTION:An exhaust passage is divided into two exhaust passages 12a, 12b which are disposed therein with a turbine 21 of a small capacity turbocharger 2 and a turbine 31 of a large capacity turbocharger 3, respectively. Further, compressors 22, 32 are coupled to the turbines 21, 31. Further, the rotary shaft of the turbocharger 3 is coupled thereto with a rotary electric machine 4 serving as a motor and a generator. Shut-off valves 5a, 5b are disposed in the exhaust passages 12a, 12b, and shut-off valves 5c, 5d are disposed in intake-air passages 23, 33. Upon idle operation during stopping of a vehicle, a controller 6 opens only the shut-off valve 5b so as to drive the turbocharger 3 in order to allow the rotary electric machine 4 to perform generator operation, and accordingly, a battery 62 is charged. Further, during acceleration, the shut- off valves 5a, 5d are opened so as to allow the turbocharger 3 to perform motor operation.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for a twin turbocharger that arranges two turbochargers for supercharging intake air to an engine and attempts to efficiently recover exhaust energy.

(Prior Art) In recent years, turbochargers that drive a turbine using exhaust gas energy from an engine and have a compressor that is driven by the turbine torque and pumps supercharged air have been frequently used. In addition, a turbocharger with a rotating electric machine has been proposed, in which a rotating electric machine is attached to the rotating shaft of the turbocharger, and the rotating electric machine operates as an electric motor or a generator depending on the engine operating status, improving engine performance and recovering exhaust energy. It is used for.

As a control device for this type of turbocharger with a rotating electrical machine, there is a means to electrically drive the rotating electrical machine in response to the depression of the vehicle's accelerator pedal to increase the pressure of supercharged air, and a means to detect abnormalities in the turbocharger during electrical drive. A proposal including a means for doing this is disclosed in Japanese Patent Laid-Open No. 2-23232.

(Problem to be Solved by the Invention) In a turbocharger with a rotating electric machine as described above, when the engine is running at low speeds and under high load, it is possible to use electric drive to increase boost pressure and improve engine output, but in the early stages of electric operation, There is a problem in that the power supply increases and the expected improvement in characteristics cannot be obtained if the power consumption is high.

In addition, even when exhaust energy is recovered as electricity, this is only a small part of the engine's operating range.Furthermore, when a turbocharger with a rotating electric machine is used as a normal turbocharger, the friction is large and There are also problems with durability during high-speed rotation.

The present invention was made in view of such problems,
The purpose is to use a turbocharger with a rotating electric machine and a normal turbocharger, or a turbocharger with a rotating electric machine.
The object of the present invention is to provide a control device for a twin turbocharger which attempts to eliminate the above-mentioned drawbacks by arranging and operating a twin turbocharger.

(Means for Solving the Problem) According to the present invention, in order to achieve the above-mentioned object, a turbocharger with a rotating electric machine connected to one side of each of an exhaust passage and an intake passage divided into two parts from an engine; a turbocharger connected to the other side of the divided exhaust passage and intake passage; each opening/closing valve for opening/closing the divided exhaust passage and intake passage, respectively; and operation detection means for detecting the operating state of the engine. , a twin turbocharger control device having control means for opening/closing each of the opening/closing valves and controlling the electric/generating operation of the rotating electric machine in response to an output signal from the operation detection means; and a twin turbocharger control device separated from the engine. a first turbocharger with a rotating electric machine connected to one side of each of the exhaust passage and the intake passage; a second turbocharger with a rotating electric machine connected to the other half of the exhaust passage and the intake passage; each opening/closing valve for opening/closing the exhaust passage and the intake passage divided into two parts, an operation detection means for detecting the operating state of the engine, and opening/closing valves for opening/closing each of the opening/closing valves according to an output signal from the operation detection means. a control device for a twin turbocharger having a control means for controlling the closing, the electric power/generation operation of the rotating electric machine of the first turbocharger with rotating electric machine, and the power generation operation of the rotating electric machine of the second turbocharger with rotating electric machine; is provided.

(Function) In the present invention, the exhaust passage and intake passage of the engine are each divided into two parts, and two turbochargers, one with a large capacity and one with a small capacity, are installed in each of the two divided passages, and an on-off valve is provided in each of these passages. The system controls the opening and closing of each on-off valve based on the level of exhaust energy depending on the operating state of the engine, and generates or electrically drives the rotating electrical machine located in the small-capacity turbocharger to energize supercharging. Supercharging is performed by a large-capacity turbocharger, or electricity is generated by a rotating electric machine installed in the turbocharger.

(Example) Next, an example of the present invention will be described in detail using the drawings.

FIG. 1 is a block diagram showing the configuration of a first embodiment of a control device for a twin turbocharger according to the present invention.

In the figure, reference numeral 1 denotes an engine, which includes two turbochargers 2 and 3. Exhaust gas from an exhaust manifold 11 is branched into exhaust passages 12a and 12b, and a turbine 21 of turbocharger 2 and a turbine of turbocharger 3, respectively. 31 is rotationally driven, and the exhaust gases after being driven are combined and discharged from the muffler 13 into the atmosphere.

22 is a compressor driven by the torque of the turbine 21, 32 is a compressor driven by the torque of the turbine 31, and these compressors 22 and 3 are
The respective flow paths 23 and 33 for the pressurized air according to No. 2 are merged and guided to the intercooler 15, and the pressurized air is introduced into the intake manifold 17 via the intake pipe 16.

Note that the turbocharger 3 has a rotating electric machine 4 serving as an electric motor/generator on its rotating shaft, and a turbocharger having a smaller capacity than the turbocharger 2 is used.

5a and 5b are on-off valves arranged in the exhaust passages 12'a and 12b, and the opening and closing of the respective passages is controlled by valve actuators 51a and 51b, and 5C and 5d are on-off valves disposed in the exhaust passages 12'a and 12b. The valve actuator 51
The opening/closing control of each flow path is performed by c and 51d. And these valve actuators 51a.

Respective control commands for 51b, 51c, and 51d are issued from a controller described later.

Reference numeral 61 denotes a power converter, which is an AC/DC bidirectional converter equipped with a converter and an inverter, and converts the DC power from the battery 62 into AC power of a predetermined frequency and supplies it to the rotating electrical machine 4 for electric drive, or Rotating electric machine 4 during power generation operation
The battery 62 is charged by converting alternating current power from the converter into direct current power having a predetermined voltage. And power converter 6
The control command to the controller 1 is configured to be issued from the controller 6.

90 is a boost pressure sensor, which detects the boost pressure to be sent to the engine 1; 92, which detects the boost pressure caused by the operation of the turbocharger 2; and 93, which detects the boost pressure caused by the operation of the turbocharger 3. .

19 is an engine rotation sensor that detects the rotation speed of the engine l, 71 is an accelerator depression amount sensor that detects the amount of depression of the accelerator pedal 7, and 8 is a vehicle speed sensor that detects the speed of the vehicle. The signal lines from these sensors serving as driving detection means are connected to the controller 6.

The controller 6 is composed of a microcomputer, and includes a central control unit that performs arithmetic processing, various memories that store arithmetic processing procedures, processing procedures, and arithmetic results, input/output devices, etc., and receives signals from the various sensors mentioned above. When input, predetermined processing is performed based on these signals, and commands are issued to the aforementioned valve actuator and power converter.

FIG. 2 is a diagram showing the operating state of the engine and the opening/closing control of various on-off valves in this embodiment, and FIG. 3 is a process flow diagram showing an example of the operation of this embodiment.

Next, the operation of this embodiment will be explained using FIGS. 2 and 3.

In step 1, the signal from the vehicle speed sensor 8 is checked,
If the vehicle speed is 0, it is determined that the vehicle is stopped and idling, and the process proceeds to step 2, in which only the on-off valve 5b is opened among the four on-off valves, and the turbocharger 3 is driven by exhaust gas to turn on the rotating electric machine 4. Power generation is activated, and its output is sent to the battery 62 via the power converter 61 for charging.

In step 1, it is determined that the vehicle is running, and in step 3, in the case of acceleration, the on-off valves 5a and 5d are opened, the turbocharger 2 is driven by exhaust energy, and the turbocharger 3 is overloaded by the electric drive of the rotating electric machine 4. Air supply is forced into engine 1.

In step 4, when the engine is at medium speed and under high load, the on-off valve 5b is also opened and the turbocharger 3 in the state of step 3 is
Exhaust gas is supplied to activate the supercharging operation, and the energization to the rotating electric machine 4 is reduced.

Next, in step 5, the respective boost pressures of both turbochargers 2 and 3 are compared, and if the boost pressure of turbocharger 2 is low, the electric drive of turbocharger 3 is continued in step 6, and the boost pressure of turbocharger 2 is If it is high, proceed to step 7 and close the on-off valve 5.
a and 5c are opened to operate only turbocharger 2 and stop operation of turbocharger 3.

Then, in step 8, the boost pressure to the engine is checked by the boost pressure sensor 90. If the boost pressure is appropriate, the current supercharging operation is continued in step 9, and if the boost pressure is high and there is a surplus, the process proceeds to step 10. Proceed to the on-off valves 5a and 5b.

5c is opened to cause the turbocharger 2 to perform supercharging, and the on-off valve 5d of the turbocharger 3 is closed to reduce pressure work and cause the rotating electric machine 4 to generate electricity.

Next, in step 11, the boost pressure sensor 9 is
0, the boost pressure to the engine is checked, and if the boost pressure is at an appropriate value, power generation is continued in step 12, but if there is margin in the boost pressure, the process proceeds to step 13, where the opening degree of the on-off valve 5a is slightly increased. Close, turbocharger 3
The exhaust energy is recovered by increasing the exhaust flow rate to increase the power generated by the rotating electric machine 4.

FIG. 4 is a block diagram showing the configuration of a second embodiment of the present invention. In this embodiment, a rotating electric machine is also arranged in the turbocharger 2 with a large capacity in the above-mentioned embodiment. The same parts as in the embodiment are given the same reference numerals.

In FIG. 4, reference numeral 8 denotes a rotating electrical machine disposed on the rotating shaft of the turbocharger 2, which operates to generate electricity when the torque of the turbine 21 is large, and the stator winding of the rotating electrical machine 8 is connected to the power converter 63. wired.

The power converter 63 has two sets of AC/DC bidirectional converters consisting of a converter and an inverter, one set of which is for the rotating electric machine 8, and the other set is a converter for the rotating electric machine 4. The operation is performed by the power converter 6 in the first embodiment.
This corresponds to 1.

FIG. 5 is a processing flow diagram showing an example of the operation of the second embodiment.

The second embodiment will be described with reference to the figure. First, when the engine 1 is idling, only the on-off valve 5b is opened, and the exhaust energy is sent to the turbocharger 3, which has a small capacity and is easy to drive, and the rotating electrical machine 4 generates electricity. At this time, the on-off valve 5d at the outlet of the compressor 32 is closed, so the work of the compressor 32 is reduced and the turbine torque is efficiently converted into electrical energy.

When starting in step 21, the on-off valves 5a and 5
d is opened (at the same time, power is supplied to the rotating electric machine 4 via the power converter 63. Therefore, since the small and responsive turbocharger 3 is electric, it is possible to prevent an increase in exhaust pressure and increase the supercharging pressure. In addition, since the opening/closing valve 5C of the turbocharger 2 to which the exhaust gas is supplied is closed, the rotational speed of the turbocharger 2 increases rapidly.

In the next step 22, boost pressure sensors 92 and 9
3, the boost pressures from each turbocharger are compared, and when the boost pressure sensor 92 is large, the on-off valves 5a and 5c are opened to allow supercharging by the turbocharger 2 whose rotation has already increased, and the on-off valve 5d is opened. The closed rotating electric machine 4 is de-energized and supercharging from the turbocharger 3 is stopped. Note that if the boost pressure sensor 93 has a larger value, the process proceeds to step 23 and the supercharging operation of the turbocharger 3 is continued.

In step 25 following the supercharging state of the turbocharger 2, the boost pressure sensor 9o detects engine l.
Check the boost pressure to the engine rotation sensor 19.
If the boost pressure is higher than the required boost pressure determined from the signal from the accelerator pedal 7 depression amount sensor 71, it is determined that the boost pressure is surplus, and the process proceeds to step 27, where the on-off valve 5b is also opened and the turbine 31 of the turbocharger 3 is driven. The rotating electric machine 4 is operated as a generator. At this time, the on-off valve 5d is closed, so the turbocharger 3, which is small and easy to drive, efficiently recovers exhaust energy as electric power. Note that if it is determined in step 25 that the boost pressure is not surplus, the process proceeds to step 26 and supercharging by the turbocharger 2 is performed.

Step 28 even after turbocharger 3 is activated to generate electricity.
Check the boost pressure to the engine 1 at Control is performed to obtain appropriate boost pressure.

Although the present invention has been described above using the above-mentioned two types of embodiments, various modifications can be made within the scope of the gist of the present invention, and these are not excluded from the scope of the present invention.

(Effects of the Invention) As described above, according to the present invention, the exhaust passage and intake passage of the engine are each divided into two parts, and turbochargers with different supercharging capacities, large and small, are connected to each of the two divided passages. At the same time, on-off valves are installed in each of these passages, and these on-off valves are controlled to open and close according to the operating status of the engine, and when the exhaust energy is low, power is generated using a rotating electric machine placed in a small-capacity turbocharger. Since the supercharging is energized, power recovery is performed efficiently and power consumption during supercharging can be reduced. Additionally, when the exhaust energy is large, a large-capacity turbocharger is activated or a rotating electric machine placed in the turbocharger is used for power generation, which has the advantage of generating power over a wide range of engine operating ranges. This is effective, and since the turbocharger can be used differently depending on the amount of exhaust energy, it is possible to improve the durability of the turbocharger and rotating electric machine.

[Brief explanation of drawings]

FIG. 1 is a configuration block diagram showing a first embodiment of a control device for a twin turbocharger according to the present invention, FIG. 2 is a diagram showing the engine operating state and control of the on-off valve in the embodiment, The figure is a processing flow diagram showing the operation of this embodiment, and FIG. 4 is a configuration block diagram of the second embodiment of the present invention.
FIG. 5 is a processing flow diagram showing the operation. 1...Engine, 2...Turbocharger, 3...
-Turbocharger, 4...Rotating electric machine, 5a, 5b. 5c, 5d...Opening/closing valve, 6...Controller, 8.
...Rotating electric machine, 12a, 12b...Exhaust passage, 16.
...Intake pipe, 19...Engine rotation sensor, 71...
- Depression amount sensor, 72...Vehicle speed sensor. Patent applicant: Isf Automobile Co., Ltd. Agent
Patent attorney Minoru Tsuji; it! : Koban I? 1m
R51? -Z”tTIJ sisocto・rηsecfJ.

Claims (4)

[Claims] (1) A turbocharger with a rotating electrical machine connected to one side of each of the exhaust passage and intake passage divided into two from the engine, a turbocharger connected to the other one of the exhaust passage and intake passage divided into two, and Each on-off valve opens/closes the bisected exhaust passage and intake passage, respectively, an operation detection means for detecting the operating state of the engine, and opening/closing of each on-off valve according to an output signal from the operation detection means. A control device for a twin turbocharger, comprising: and a control means for controlling electric power/generating operation of the rotating electric machine. (2) The control device for a twin turbocharger according to claim (1), wherein the turbocharger with rotating electric machine has a smaller capacity than the turbocharger. (3) A first turbocharger with rotating electric machine connected to one side of each of the exhaust passage and intake passage divided into two parts from the engine, and a second turbocharger connected to the other side of the exhaust passage and intake passage divided into two parts. A turbocharger with a rotating electric machine, each opening/closing valve that opens and closes the exhaust passage and intake passage divided into two, an operation detection means for detecting the operating state of the engine, and a response to an output signal from the operation detection means. The opening/closing of each on-off valve, the electric/power generation operation of the rotating electrical machine of the first rotating electric fence-equipped turbocharger, and the second
1. A control device for a twin turbocharger, comprising: control means for controlling a power generation operation of a rotating electric machine of a turbocharger with a rotating electric machine. (4) The twin turbocharger control device according to claim (3), wherein the first turbocharger with rotating electric machine has a smaller capacity than the second turbocharger with rotating electric machine. .