Energy flow controlling method for parallel type mixed power system

Energy flow controlling method for parallel type mixed power system

  • CN 101,125,548 B
  • Filed: 09/07/2007
  • Issued: 10/24/2012
  • Est. Priority Date: 09/07/2007
  • Status: Active Grant
First Claim
Patent Images

1. the energy flow controlling method of a parallel connection type hybrid power system is characterized in that it may further comprise the steps:

  • 1) control of car demand power;

    Under different road conditions, calculate the power P d of total current demand of car according to torque-demand, the speed of a motor vehicle and driving engine the present situation of driver;

    (1) if car is operated in acceleration mode, demand power is big, i.e. Pd>

    0, and driving engine and battery must be worked simultaneously;

    (2) if car is operated in deceleration regime, the demand power negative value, i.e. Pd<

    0, engine stop working utilizes brake power to charge the battery;

    (3) if car is operated in cruising condition, when demand power is medium or smaller, i.e. Pd>

    0, driving engine works independently, or battery works independently, and perhaps engine operation charges the battery simultaneously;

    2) state of charge of storage battery control;

    Obtain the charge state value of storage battery from the state of charge measurement mechanism of storage battery, and observe following rule;

    (1) keeps state of charge in the 50-70% scope;

    (2) avoid the battery degree of depth to discharge and recharge;

    3) be the first preferential energy current control rule with the state of charge of storage battery;

    The control of total energy is first preferential with the state of charge of keeping storage battery, and the state of charge of battery is depended in the work of driving engine;

    Observe following rule;

    (1) when battery state of charge>

    90%, battery provides all power, does not charge;

    Just charge when having only brake;

    Driving engine is not worked, and when having only battery separately under power to be provided, driving engine is supplemental capacity;

    (2) when battery state of charge 70%~

    90%, battery provides power preferential, just charges when having only brake;

    Driving engine is not worked, and when having only battery separately under power to be provided, driving engine is supplemental capacity;

    (3) when battery state of charge 40%~

    70%, battery and simultaneous firing, battery is chargeable during brake;

    (4) when battery state of charge 30%~

    40%, the driving engine priority task when driving engine has enough surpluss power, can charge the battery;

    Battery is chargeable during brake;

    (5) when battery state of charge<

    30%, it is first preferential that driving engine charges the battery, and battery is chargeable during brake;

    4) overall system constraint;

    comprise that frictional horsepower, driving engine are opened and the constraint of pass and clutch state;

    Wherein, The power P d of the current demand of car deducts the required horsepower output Pe that required storage battery horsepower output Pb obtains driving engine;

    According to the power P d of the current demand of car, consider the constraint of frictional horsepower Pf, confirm that system allows the horsepower output Pe of driving engine 1;

    Pd>

    0 o'"'"'clock Pe 1=Pe Pd<

    0 o'"'"'clock Pe>

    Pf Pe 1=Pe Pe<

    Pf Pe 1

    Pf According to the state of driving engine open/close state and power-transfer clutch, decision systems allows the horsepower output Pe of driving engine again *;

    If driving engine be start state simultaneously power-transfer clutch be in 1,2,5 positions, AND==1 so, otherwise AND=0;

    Engine output Pe *Computing formula;

    AND=

    1 Pe *

    Pe 1AND=

    0 Pe *

    0 Obtain the horsepower output Pb that system allows storage battery *, its computing formula;

    If if driving engine is start and power-transfer clutch is in 1,2,5 positions, AND==1 so, otherwise AND=0;

    When AND=1, Pb *=Pb When AND=0, Pb *=Pd SOC>

    0.3 Pb *

    0 SOC<

    0.3 Add engine output with the battery horsepower output, deduct the required power of car again, obtain brake power Ps=Pb *+ Pe *-Pd Consider the situation of present engine, the brake power Ps that system allows *For;

    If if driving engine is start and power-transfer clutch is in 1,2,5 positions, AND==1 so, otherwise AND=0;

    AND=

    1 Ps *

    0 AND=

    0 Ps *

    Pb *+Pe *-Pd 5) with engine output Pe *The engine optimization working controller is sent in order, utilizes the fuel up economic curve of this driving engine, obtains cooresponding optimal engine speed under the condition of present engine horsepower output;

    6) with required storage battery power P b *, engine power Pe *, brake power Ps *With driving engine optimum fuel economic curve as input, send torque controller, obtain the torque command of motor torque order, electrical generator and electrical motor respectively, thereby accomplish the distribution and the control of energy.

View all claims
    ×
    ×

    Thank you for your feedback

    ×
    ×