Apparatus of controlling hybrid vehicle having electric supercharger and method thereof
A control apparatus for a hybrid vehicle includes an engine that combusts fuel to generate power. A drive motor assists the engine power and selectively operates as a generator to generate electrical energy. A clutch is disposed between the engine and drive motor. A battery supplies electrical energy to the drive motor or is charged by the generated electrical energy. A DC converter transforms a DC from the battery. An electric supercharger supplies supercharged air to the engine. A controller determines an optimal air amount to maximize system efficiency based on a drive motor limited output value determined by a battery SOC, and determines an output drive motor power output and an output engine power output based on the optimal air amount when an atmospheric pressure is less than a predetermined pressure, intake temperature is greater than a predetermined temperature and the SOC is less than a predetermined value.
1. An apparatus of controlling a hybrid vehicle including an electric supercharger, the apparatus comprising:
an engine configured to combust fuel to generate power;
a drive motor configured to assist the power generated by the engine and to selectively operate as a generator to generate electrical energy;
a clutch disposed between the engine and the drive motor;
a battery configured to supply electrical energy to the drive motor or to be charged by the electrical energy generated at the drive motor;
a direct current (DC) converter configured to transform a direct current output from the battery;
an electric supercharger configured to supply supercharged air to the engine; and
a controller configured to:
determine an optimal air amount to maximize a system efficiency based on a limited output value of the drive motor determined by a state of charge (SOC) of the battery; and
determine a drive motor power output from the drive motor and an engine power output from the engine based on the optimal air amount when an atmospheric pressure is less than a predetermined pressure, intake temperature is greater than a predetermined temperature and the SOC is less than a predetermined value.
2. The apparatus of claim 1 , wherein the system efficiency is determined from a driver required power, a fuel amount supplied to the engine, a low calorific power of fuel, a consumed power in the electric supercharger, an output power supplied to the DC converter, an engine power output from the engine, an efficiency of the drive motor, and power transmission efficiency.
3. The apparatus of claim 2 , wherein the system efficiency is determined from an equation of:
sys
.
eff
.
=
P
driver
M
fuel
×
LHV
+
(
P
eSC
+
P
LDC
+
P
driver
-
P
eng
η
mot
)
/
η
tran
wherein P drive is a required power of a driver, M fuel is fuel amount supplied to the engine, LHV is low calorific power of fuel, P esc is consumed power in the electric supercharger, P LDC is a consumed power in the DC converter, P eng is an engine power, η mot is an efficiency of the drive motor, and η tran is a power transmission efficiency.
4. A method of controlling a hybrid vehicle including an electric supercharger, comprising:
receiving, by a controller, a driving information including a driver required power, an engine speed, a state of charge (SOC) of a battery, an atmospheric pressure, and an intake temperature;
determining, by the controller, an optimal air amount to maximize a system efficiency based on a limited output value of the drive motor determined by the SOC of the battery when the SOC is less than a predetermined value;
determining, by the controller, an engine torque output from the engine from the optimal air amount; and
determining, by the controller, an output torque of the drive motor for satisfying the required torque of the driver from the engine torque.
5. The method of claim 4 , wherein the system efficiency is determined from the driver required power, a fuel amount supplied to the engine, a low calorific power of fuel, a consumed power in the electric supercharger, an output power output from the DC converter, an engine power output from the engine, an efficiency of the drive motor, and power transmission efficiency.
6. The method of claim 5 , wherein the system efficiency is determined from an equation of:
sys
.
eff
.
=
P
driver
M
fuel
×
LHV
+
(
P
eSC
+
P
LDC
+
P
driver
-
P
eng
η
mot
)
/
η
tran
wherein P drive is a required power of a driver, M fuel is fuel amount supplied to the engine, LHV is a low calorific power of fuel, P esc is consumed power in the electric supercharger, P LDC is a supplied power to the DC converter, P eng is an engine power, η mot is an efficiency of the drive motor, and η tran is a power transmission efficiency.