Control device for supercharging system

1. A control apparatus of a supercharging system for supplying an engine with compressed intake air, the control apparatus comprising:

a supercharger including a compressor configured to compress the intake air to be supplied to the engine; and

a controller for controlling a control device affecting operation of the compressor,

wherein the controller includes:

a compressor map storage part configured to store a compressor map which indicates a relationship of an intake volume flow rate, a pressure ratio, and a compressor rotation speed in the compressor;

a current position calculation part configured to calculate a current position of an operational point of the compressor on the compressor map every predetermined period;

a moving direction calculation part configured to calculate a current moving direction of the operational point on the compressor map on the basis of a previous position and the current position of the operational point calculated by the current position calculation part; and

a control part configured to control the control device on the basis of the current position of the operational point calculated by the current position calculation part and the moving direction of the operational point calculated by the moving direction calculation part

wherein the controller further includes a moving velocity calculation part configured to calculate a moving velocity of the operational point on the basis of a change amount per time of the current position of the operational point calculated by the current position calculation part, and

wherein the control part is configured to control the control device on the basis of the current position of the operational point calculated by the current position calculation part, the moving direction of the operational point calculated by the moving direction calculation part, and the moving velocity of the operational point calculated by the moving velocity calculation part.

2. The control apparatus of a supercharging system according to claim 1 ,

wherein the controller further includes a moving direction determination part configured to determine whether the moving direction of the operational point is in a target direction, and

wherein the control part is configured to control the control device so as to orient the moving direction of the operational point in the target direction, if the moving direction of the operational point is not in the target direction.

3. The control apparatus of a supercharging system according to claim 2 ,

wherein the controller further includes a control map storage part configured to storage a control map for calculating a control amount of the control device corresponding to the current position of the operational point, and

wherein the control part is configured to correct the control amount of the control device calculated on the basis of the control map, so as to orient the moving direction of the operational point in the target direction.

4. The control apparatus of a supercharging system according to claim 1 ,

wherein the controller further includes an arrival time estimation part configured to estimate an arrival time the operational point takes to arrive at a predetermined region or a target position from the current position, on the basis of the moving direction and the moving velocity of the operational point, and

wherein the control part is configured to control the control device in response to a comparison result between a predetermined time and the arrival time estimated by the arrival time estimation part.

5. The control apparatus of a supercharging system according to claim 4 ,

wherein the predetermined region is a surge region defined as a region where surging is likely to occur if the operational point is in the predetermined region, and

wherein the control part is configured to control the control device so as to avoid entrance of the operational point into the surge region, if the arrival time the operational point takes to arrive at the surge region from the current position is shorter than a first predetermined time.

6. The control apparatus of a supercharging system according to claim 5 ,

wherein the controller further includes a control map storage part configured to store a control map for calculating a control amount of the control device corresponding to the current position of the operational point, and

wherein the control part is configured to correct the control amount of the control device calculated on the basis of the control map so as to avoid entrance of the operational point into the surge region.

7. The control apparatus of a supercharging system according to claim 4 ,

wherein the control part is configured to control the control device so that the operational point arrives at the target position in a shorter time than a second predetermined time, if the arrival time the operational point takes to arrive at the target position from the current position is longer than the second predetermined time.

8. The control apparatus of a supercharging system according to claim 7 ,

wherein the controller further includes a control map storage part configured to store a control map for calculating a control amount of the control device corresponding to the current position of the operational point, and

wherein the control part is configured to correct the control amount of the control device calculated on the basis of the control map so that the operational point arrives at the target position in a shorter time than the second predetermined time.

9. The control apparatus of a supercharging system according to claim 1 ,

wherein the supercharger comprises a turbocharger configured to rotate the compressor with a turbine rotated by exhaust gas discharged from the engine, and

wherein the control device includes at least one of a fuel injection device for supplying the engine with fuel, a variable nozzle mechanism for controlling a flow direction of the exhaust gas flowing into the turbine, or a waste gate valve for controlling a flow rate of the exhaust gas flowing into the turbine.