JPS63159619A - Control device for variable capacity type supercharger - Google Patents

Abstract

PURPOSE:To obtain the sufficient heater capacity even during idling by controlling the nozzle vane opening of a supercharger in response to the engine water temperature when a car heater is used at the time of engine idling and vehicle stop. CONSTITUTION:When a driver turns a heater switch 6 on, a controller C judges whether an engine is in an idle state or not based on the output from an accelerator sensor 5 and judges whether a vehicle is in a stop state or not based on the output from a parking brake switch 7. If the engine is in the idle state and the vehicle is in the stop state, the controller C controls a step motor 2 based on outputs from a cooling water temperature sensor 4 of the engine and a nozzle vane opening sensor 3. Accordingly, a nozzle vane is opened or closed via a turbo-lever 1 provided on a turbine housing 11.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a control device for a variable displacement turbocharger, and particularly to a control device for a variable displacement turbocharger (Variable Geometry Turbocharger).
The present invention relates to a device for controlling a heater when the engine is idling by controlling the urbo system.

[Conventional technology]

In recent years, automobile engines have tended to have smaller displacements and higher supercharging in order to save fuel.

For this reason, the present applicant has already proposed a nozzle vane drive device for a variable capacity supercharger in Japanese Utility Model Application Publication No. 59-70034.

As schematically shown in FIG. 3, the movable nozzle vane 10 is installed in the turbine housing 11, so that the nozzle vane 10 is particularly controlled as shown in FIG.

That is, the rotating shaft 13 of the movable nozzle vane 10 is attached to the free end of the control lever 12 attached to the outside of the turbine housing 11, and the opposite end of the control lever 14 is engaged with the inner peripheral surface of the control ring 15. .

Also, actuators (control cylinders) 17 with different stroke amounts are pneumatically controlled by the controller 16.
A link rod 21 is pivotally attached to the tips of two operating rods 19 and 20 that reciprocate by 18.
Further, an output rod 22 is pivotally attached to the control ring 15 so that the control ring 15 is rotated by the output rod 22.

As a result, the nozzle vane lO rotates via the output rod 22 and the control lever 14, so that the turbine 30
The rotation of the turbine 30 can be controlled by adjusting the exhaust gas flow rate to the turbine 30 .

[Problem that the invention seeks to solve]

As described above, the variable displacement supercharger control device proposed earlier originally uses a small displacement engine, so there was a problem in that the car heater capacity was insufficient during idling.

Therefore, an object of the present invention is to provide a control device for a variable capacity supercharger that can strengthen the heater during idling even in a small displacement highly supercharged engine.

(Means for Solving the Problems) As a means for solving the above problems, in the control device for a variable capacity supercharger according to the present invention, a heater switch, an idling operation detection means, and a stop detection means are provided. , a step motor that controls the nozzle vane of the turbo via a turbo lever, an opening sensor for the nozzle vane, a cooling water temperature sensor, and a controller that controls the water temperature and the nozzle vane opening if the heater switch is turned on and the idle operation is stopped. and control means for controlling the step motor accordingly.

[For production]

In the variable capacity supercharger control device of the present invention, when the driver turns on the heater switch, the idling operation detection means detects the idling operation state of the engine, and if the stop detection means detects the stop state, the engine is stopped. By controlling the step motor according to the water temperature detected by the cooling water temperature sensor and the output of the nozzle vane opening sensor, the opening of the nozzle vane is controlled to a predetermined position via the turbo lever.

〔Example〕

Hereinafter, an embodiment of the control vL position of the variable capacity supercharger according to the present invention will be described.

FIG. 1 shows an embodiment of the control device for a variable displacement supercharger according to the present invention, and in the figure, the turbo lever l provided in the turbine housing 11 corresponds to the control lever 22 in FIG. ing. Therefore, the nozzle vane (not shown) in the coupin housing 11 can be opened and closed by moving the turbo lever l.

This turbo lever 1 is connected to be driven by a step motor 2. The vane opening sensor 3 detects the number of steps taken by the step motor 2. This sensor 3 is composed of a potentiometer, and its output is adjusted in advance so that the number of steps of the step motor 2 corresponds to the opening of the nozzle vane.For example, the step motor when the vane is fully opened By storing the output of the sensor 3 indicating the step position of Step 2 as the maximum value in a memory (not shown) built into the controller C, and similarly storing the fully open position of the vane as the minimum value, the number of steps in between is stored. One possible method is to divide the

$11111 The controller C as a means receives the opening signal from the vane opening sensor 3 as well as the water temperature sensor 4.
, an accelerator sensor 5, a heater switch 6, a parking brake switch 7, a clutch switch 8, and an engine speed sensor 9.

Here, the basic concept of the present invention will be explained with respect to the nozzle vane 10 shown in FIGS. 2 and 3.

As shown in FIG.
When it is on the radial line, it is fully open, and the turbine 3
When it is in the circumferential direction of 0, it is in a fully closed state. In this case, the turbine efficiency is high at or near the fully open state (this is a practical use area; at or near the fully closed state, the turbine efficiency is close to zero, and only the exhaust pressure is large and the turbine 30 does not rotate). The region between the two is unsuitable for use because the turbine efficiency is low and fuel consumption deteriorates on a steady basis, but it is a region that can be used transiently to eliminate turbo lag. .Therefore,
When the engine speed drops, the vanes are rotated in the closing direction to increase the gas flow velocity.

A graph showing the relationship between the opening degree of the nozzle vane and the exhaust pressure is shown in FIG.

However, as the nozzle vane 10 is closed, the exhaust gas is constricted, resulting in an increase in exhaust pressure, resulting in: ■ an increase in engine friction (load) due to the increase in exhaust pressure;
The increase in exhaust pressure increases the amount of exhaust gas blown back into the intake process during the over-ramp period of the intake/exhaust valves, and increases the compression/combustion temperature, thereby increasing the heater's capacity (engine cooling water heat dissipation). increases, making it possible to compensate for the lack of heater capacity.

Using such a principle, the operation of the embodiment shown in FIG. 1 will be explained next along with the flowchart of the program stored in the controller C shown in FIG. 4.

First, to describe the conditions for switching to the idle heater, turn on the heater switch 6 (step 51 in Figure 4).Next, to detect the idle state of the engine, turn on the accelerator sensor 5. The output checks whether the accelerator opening is less than 5% of the fully open state (S2), and if it is less than 5%, the parking brake switch 7 is activated to further check whether the vehicle is stopped. It is checked whether it is turned on (S3).

When these conditions are met, idle heater control is executed (S4). In other words, the method of controlling the variable capacity supercharger when the engine is idling is as shown in the graph of Figure 5. The opening degree of the nozzle vane (which corresponds to the number of steps of the step motor 2) with respect to the engine cooling water temperature is stored in the memory of the controller C as a map. Therefore, the water temperature is detected from the water temperature sensor 4 (341), the opening degree of the nozzle vane 10 corresponding to the water temperature is read from the memory map, and the step motor 2 is moved forward (342).

As a result, the nozzle vane 10 is controlled so that the engine water temperature remains constant.

If even one of these idle heater conditions is canceled,
The control will then shift to a normal variable capacity supercharger (the same S
5) This control is performed by reading out the nozzle vane opening degree muff from the memory of the controller C and controlling the step motor 2, which is determined by the engine rotation speed signal output from the rotation speed sensor 9 and the engine load signal output from the accelerator sensor 5. Control is performed by detecting the target number of pulses.

However, since the present invention uses exhaust throttle to improve the effectiveness of the heater, if such control is entered during normal driving, the output will decrease due to an increase in engine friction, and the durability will be affected due to an abnormal increase in exhaust pressure. Limit: ``The reduction in the amount of fresh air intake leads to combustion failure and a decrease in output.

Therefore, in anticipation of a delay in the operation of the turbo lever 1 and the step motor 2, it is necessary to cancel the idle heater condition in advance before entering normal variable capacity supercharger control.

Therefore, normally, by turning off the parking brake inch 7, the driver's intention to start is V! normal control (same 35)
), but for example, when starting on a slope, the parking brake will be applied and the vehicle will start, so in order to avoid being judged as stopped in this case, the clutch switch 8 will be turned on and then the parking brake will be turned on for a certain period of time. It is necessary to exclude it from the idle heater conditions until To has elapsed.

For this reason, step S6 is performed prior to steps 81 to S4.
The vehicle is determined to be in an idling state even on a slope only when a certain period of time TO has elapsed. This step can also be performed by combining the two by detecting the intention to start when the neutral position sensor of the transmission is off and detecting the vehicle stop using the vehicle speed sensor. Therefore, in these cases, normal control is entered without entering idle heater condition control.

〔Effect of the invention〕

As described above, in the variable capacity supercharger control device according to the present invention, when the car heater is to be used when the engine is idling and the car is stopped, the nozzle vane opening degree of the supercharger is controlled according to the engine water temperature. Therefore, it is possible to obtain sufficient heater capacity even when the engine is idling.

[Brief explanation of the drawing]

FIG. 1 is a configuration diagram showing one embodiment of a control device for a variable capacity supercharger according to the present invention, and FIG. 2 is a diagram showing the relationship between the turbine and the opening of the nozzle vane in order to explain the present invention in detail. Figure 3 is a graph showing the relationship between nozzle vane opening and engine exhaust pressure, Figure 4 is a flow chart of the program executed by the controller in Figure 1, Figure 5 is A graph diagram forming a memory map for idle heater control, Figure 6 is a schematic diagram showing the general structure of a variable capacity supercharger, and Figure 7 is a graph based on Utility Model Application Publication No. 59-70034 G. It is a figure which shows the drive device of the variable displacement supercharger shown. In Figure 1, 1 is a turbo lever, 2 is a step motor, 3 is a vane opening sensor, 4 is a water temperature sensor, and 5 is a step motor.
6 is an accelerator sensor, 6 is a heater switch, 7 is a parking brake switch, 8 is a clutch switch, 9 is a rotation speed sensor, C is a controller, 10 is a nozzle vane, 11 is a turbine housing, and 30 is a turbine. In the drawings, the same reference numerals indicate the same or corresponding parts. Patent Applicant: Isuri Motor Co., Ltd. Representative Patent Attorney Shuji Shigeru Izumi Turbine 30 Figure 3 Figure 4

Claims (6)

[Claims] (1) A heater switch, an idle operation detection means,
a stop detection means, a step motor that controls the nozzle vane of the turbo via a turbo lever, an opening sensor of the nozzle vane, a cooling water temperature sensor, and a stop detection means that controls the idling operation when the heater switch is turned on and the water temperature and the water temperature when the heater switch is turned on and when the engine is stopped. A control device for a variable capacity supercharger, comprising: control means for controlling the step motor according to the opening degree of a nozzle vane. (2) The control device for a variable displacement supercharger according to claim 1, wherein the control means stores a relationship between the water temperature and the number of steps of the step motor. (3) The control device for a variable capacity supercharger according to claim 1 or 2, wherein the idle operation detection means is an accelerator sensor that detects an accelerator opening less than a predetermined value. (4) Any one of claims 1 to 3, wherein the stop detection means is a parking brake switch.
A control device for a variable capacity supercharger as described in 2. (5) The control device for a variable capacity supercharger according to any one of claims 1 to 3, wherein the stop detection means is a combination of a parking brake and a clutch switch. (6) Any one of claims 1 to 5, wherein the nozzle vane opening sensor detects the opening of the nozzle vane that has passed through the turbo lever by detecting the number of steps of the step motor. A control device for a variable capacity supercharger according to item 1.