JPH04255529A - Controller of turbocharger with rotary electric machine - Google Patents

Abstract

PURPOSE:To perform acceleration operation by means of increased pressure of supercharged air caused by motor-driven operation of the rotary electric machine of a turbocharger based on engine rotational speed and acceleration opening, after judging the intention of a driver for acceleration. CONSTITUTION:An engine rotational speed sensor 17, an acceleration sensor 22, and a boost pressure sensor 16 are arranged in their related places respectively, and respective detection signals are inputted to a controller 5. Judgement on existence of intention of a driver for acceleration is performed from an releasing quantity of an acceleration pedal 21 in a specified time. Only in the case when it is judged that acceleration stepping-in by the intention of the driver for acceleration is affirmation, the rotary electric machine is operated, and control for acceleration is performed based on a pressure difference between a target boost pressure calculated from acceleration opening and engine rotational speed and actually present boost pressure.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a control device for a turbocharger with a rotating electrical machine that controls the operation of a rotating electrical machine attached to the turbocharger.

0002

2. Description of the Related Art Turbochargers are widely used in which a compressor is attached to a turbine driven by exhaust energy, and turbocharging air is forcefully delivered to an engine by the compressor's pneumatic operation.

On the other hand, the rotating shaft of the turbocharger is
Various attempts have been made, such as installing a generator and operating the engine electrically or generating electricity depending on the operating state of the engine, assisting the supercharging operation of a turbocharger, or recovering exhaust energy as electricity.

[0004] When controlling a turbocharger equipped with such a rotating electric machine, Japanese Patent Laid-Open No. 1-117933 proposes controlling the power to the rotating electric machine based on the accelerator pedal depression speed and amount, engine rotation speed, etc. It is disclosed in the publication No.

[0005]

[Problem to be Solved by the Invention] In the proposal shown in the above-mentioned patent publication, when electrically driving a rotating electric machine attached to a turbocharger, the target boost pressure calculated from the accelerator opening and the engine rotation speed and the point in time are determined. The differential pressure between the boost pressure and the boost pressure is determined, and if it is greater than a predetermined value, it is determined that acceleration is occurring and control is performed.

However, with this method, even if the driver slightly depresses the accelerator without intending to accelerate, this depressing changes the target boost pressure and causes the inconvenience that the rotating electric machine is electrically driven. Become.

The present invention was made in view of these problems, and its purpose is to control the rotating electric machine according to the aforementioned boost differential pressure only when the driver's intention to accelerate is determined. An object of the present invention is to provide a control device for a turbocharger with an electric motor.

[0008]

[Means for Solving the Problems] In order to achieve the above-mentioned object, according to the present invention, a rotating electrical machine disposed in a turbocharger is electrically driven to apply supercharging pressure based on the engine speed and the accelerator opening. A control device for a turbocharger with a rotating electrical machine that accelerates and controls the acceleration of an engine is provided with an engine rotation speed detection means, an accelerator opening detection means, and a boost pressure detection means for the engine. There is provided a control device for a turbocharger with a rotating electrical machine that determines a driver's intention to accelerate based on the amount of opening of the accelerator and controls the electric drive of the rotating electrical machine in accordance with the determination.

[0009]

Embodiments Next, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a block diagram showing an embodiment of a control device for a turbocharger with rotating electric machine according to the present invention.

In the figure, reference numeral 1 denotes an engine that drives wheels 15 using the combustion energy of air taken in through an intake pipe 11 and fuel supplied from a fuel injection device 2 to run the vehicle. Gas is exhausted via exhaust pipe 12. Note that 13 is a clutch and 14 is a transmission, and engine torque is transmitted to wheels 15 via these power transmission mechanisms.

3 is a turbocharger, and an exhaust pipe 12
The engine is equipped with a turbine 31 that is rotated by exhaust energy discharged from the engine, and a compressor 32 that is driven by the turbine torque and compresses air. 1. Also, 16
17 is a boost pressure sensor disposed in the intake pipe 11 and serves as a boost pressure detection means for the engine 1; 17 is an engine rotation sensor that serves as a rotation speed detection means for the engine 1;
Reference numeral 22 denotes an accelerator sensor which is attached to the accelerator pedal 21 and serves as means for detecting the amount of depression and the speed of depression, and detection signals from these sensors are sent to controllers to be described later.

Reference numeral 4 denotes a rotating electrical machine disposed on the rotating shaft of the turbocharger 3. For example, when the engine 1 is accelerating or under low rotation and high load, it operates as an electric motor using electric power from a battery 42 supplied via a power converter 41. The controller issues a conversion command to the power converter 41, which has the function of converting DC power from the battery 42 into predetermined AC power. It is configured to be issued from 5 onwards.

The controller 5 is composed of a microcomputer, and includes a central control unit that performs arithmetic processing, various memories that store arithmetic processing procedures, control procedures, target boost pressure value maps during acceleration, low rotation and high load, etc., and input/output. It is equipped with an output circuit, etc., and when detection signals from the various sensors mentioned above are input, predetermined arithmetic processing is performed, and control commands are issued to the power converter 41 etc. based on stored control procedures. It is something.

FIGS. 2 and 3 are process flow diagrams showing an example of the operation of this embodiment, and the operation of this embodiment will be explained using the same figures.

Here, FIG. 2 shows a flow for determining the driver's intention to accelerate in this embodiment, which is shown in steps S1 to S18, and FIG. 3 shows a control flow for the rotating electrical machine (TCG) during acceleration, and shows steps T1 to T14. This is shown in steps, and the process moves to the process in FIG. 3 only when the intention to accelerate is determined by the process in FIG. While the flow of FIG. 3 is being executed due to the intention of acceleration, the process of FIG. 2 is not performed until the acceleration is completed. This is to prevent the operation of the rotating electric machine from being stopped before sufficient acceleration is achieved, if it is determined that the driver has no intention of accelerating when he finishes pressing the accelerator pedal. .

First, in S1 in FIG. 2, it is checked whether the vehicle is stopped, and if the vehicle is running, it is determined in S2 whether the accelerator sensor 22 is measuring the accelerator release speed. Then, when the measurement is in progress, the process advances to S5, but when the measurement is not in progress, the process advances to S3 and S4, and the measurement start time t1
and then set the accelerator opening Yt1 at t1.
Measure.

[0018] In S5, it is checked whether the time Δt has elapsed since the set t1, and if it has not elapsed, the process proceeds to S18, but if the time Δt has elapsed, t1 is reset in S6, and the accelerator opening degree Yt2 at that time is set in S7. Measure.

In the next step S8, Yt2 and Yt1 are compared, and if the accelerator pedal is depressed and Yt2 is large, the process proceeds to S9 where AO=Yt2/Yt1 and S1
0, here the AO is compared with the acceleration judgment value and A
If O is large, acceleration is determined (ACC=1) in S11, and the process proceeds to the flow of FIG. 3, which will be described later.

On the other hand, in comparing Yt2 and Yt1 in S8, if the accelerator pedal is released and Yt1 is larger, proceed to S12 and calculate AO=Yt1/Yt2.
shall be. Then, in S13, the AO is compared with the abort judgment value, and if the AO is small, the process proceeds to S14, but if the AO is large, the process proceeds to S15, where it is determined that the acceleration should be aborted (ACC=0).
However, if the rotating electric machine (TCG) is operating in S16, S1
At step 7, the operation is stopped and normal control A is entered.

[0021] Furthermore, if AO is small in S13 and the process proceeds to S14, it is checked whether ACC=1 or not, and ACC
When =1, the process moves to the acceleration processing flow shown in FIG. 3, and when it does, the process moves to normal control A.

[0022] When proceeding to S18 from the above-mentioned step S5 or S10, the ACC
Depending on whether =1 is checked, the process proceeds to acceleration control B or normal control A.

Next, at T1 in the process flow of FIG. 3, a target boost pressure TB is calculated. This is the target boost pressure calculated by predetermined processing of the controller 5 according to the amount of depression of the accelerator pedal and the engine rotation speed, that is, the detection signals from the accelerator sensor 22 and the engine rotation sensor 17. Next, at T2, the current boost pressure BP is measured based on the detection signal from the boost pressure sensor 16, and at T3, the differential pressure between these two boost pressures TB and BP is compared with a predetermined upper limit value of the differential pressure.

In this comparison, if TB-BP is greater than the upper limit of differential pressure, the process proceeds to T5, and the power converter 4 is set as COOD=1.
1, the maximum current is supplied to the rotating electrical machine 4 to drive it electrically, and supercharging pressure is applied (T6, T7).

On the other hand, if the value of TB-BP is smaller than the upper limit value of differential pressure at T3, the process proceeds to T4, where a comparison with the lower limit value of differential pressure is performed. If the differential pressure is below the lower limit value, T
At step 11, COOD=0, the supply current is minimized to stop the rotating electric machine 4, and it is determined that acceleration has ended (ACC=0), and the routine shifts to normal control (T12 to T14).

Furthermore, if TB-BP is equal to or higher than the lower limit of the differential pressure at T4 mentioned above, the process proceeds to T8, and when COOD=1, the process proceeds to T8.
Proceed to step 9 to calculate the supply current value based on the boost differential pressure and supply it to the rotating electric machine 4, but if no at T8, the rotating electric machine 4 is stopped according to the flow after T11 and the process shifts to normal control A. become.

Although the present invention has been described above with reference to the above-mentioned embodiments, various modifications can be made within the scope of the present invention, and these modifications are not excluded from the scope of the present invention.

[0028]

Effects of the Invention According to the present invention, as explained in the above-described embodiments, when electrically controlling a rotating electrical machine disposed in a turbocharger, a target boost pressure based on the accelerator opening and engine speed and a current boost pressure can be determined. In addition to controlling the vehicle according to the differential pressure between the two, it also performs electric control after determining the driver's intention to accelerate. This eliminates involuntary changes in the accelerator, such as reducing the accelerator opening and then releasing the accelerator. Therefore, the effect of solving the conventional inconvenience can be obtained.

Further, according to the present invention, there is an advantage that the operating rotating electric machine can be stopped by the driver reducing the accelerator opening and performing an operation that determines that acceleration is to be stopped.

[Brief explanation of the drawing]

FIG. 1 is a configuration block diagram showing an embodiment of a control device for a turbocharger with rotating electric machine according to the present invention.

FIG. 2 is a processing flow diagram showing an example of the operation of this embodiment.

FIG. 3 is a processing flow diagram showing an example of the operation of this embodiment.

[Explanation of symbols]

1...Engine 3...Turbocharger 4...Rotating electric machine 5...Controller 16...Boost pressure sensor 17...Engine rotation sensor 21...Accelerator pedal 22...Accelerator sensor 41...Power converter 42...Battery

Claims (1)

[Claims] In a control device for a turbocharger with a rotating electric machine that electrically drives a rotating electric machine disposed in the turbocharger based on the engine rotation speed and an accelerator opening degree to energize supercharging pressure and control acceleration of the engine, an engine rotation speed detection means and an accelerator opening detection means and a boost pressure detection means for the engine, and based on the signals from these detection means, the driver's intention to accelerate is determined from the accelerator opening amount, and the rotating electric machine A control device for a turbocharger with a rotating electric machine, which controls the electric drive of a turbocharger.