Week - 4
1.Start simulink and create a blank model.
2.Search for chart block in the stateflow category of library browser.
3.Open the chart block and select the junction feature from the stateflow window. 4.Control logic for washing m/c is such that it should
soak the water for the first 200sec followed by
washing time of 100sec. Rinsing the water for the next
20sec followed by drying time of 50sec.
5. After finishing the control logic run the STATEFLOW and check the sequence of operation for 370sec.
Blocks Used
1. Chart
A finite state machine is a representation of an event driven (reactive) system. In an event-driven system, the system responds to an event by making a transition from one state (mode) to another. This transition occurs if the condition defining the change is true. The Display block shows the value of the input data. You can specify the frequency of the display. For numeric input data, you can also specify the format of the display.
3. Constant
The Constant block generates a real or complex constant value signal. Use this block to provide a constant signal input.
4. Lamp
The Lamp block displays a color indicating the value of the input signal. You can use the Lamp block with other Dashboard blocks to build an interactive dashboard of controls and indicators for your model. You can specify pairs of input values and colors to provide the information you want during the simulation.
5. Rocker Switch:
The Rocker Switch block toggles the value of the connected block parameter between two values during simulation. For example, you can connect the Rocker Switch block to a Switch block in your model and change its state during simulation.
Logic Explanation
A Rocker switch from the dashboard library is used with a constant to supply the power and as water supply. A lamp is used to indicate the power status & water status. The power status is checked at the entry for every
state and the water supply is checked for the soaking and the rinsing process. The timing for each state is as per the given inputs. The status of the running process can be seen by the glowing lamp corresponding to the process name.
In the above control logic first state is created with 2 conditions for power supply.
One is with power supply available(PowerSwitch=-1) and second with water supply available
(W==1). If the power supply at entry is 1 and water supply is on, then machine will get activated and start the next process of operation.
Next 4 Operation states have been created in flow order Soaking, Washing, Rinsing, Drying with their time of operation as 200sec for a soak, 100sec for wash,20 sec for rinse & 50sec for dry.Entry and exit condition of the state are kept as O & i.e at entry of operation states it is O and as operation completes it is 1 for every states. After all process has done washing machine
Here all LED glown as Green means all process has been completed and all display output as 1.
Simulink Model, Showing that the washing process is completed & Rinsing is going on.
Here Red light means operation is not completed and green LED shows operation is completed which is also check from display box as output 1
2. Make a Simulink chart for the "Gear shift" logic as per below conditions:
Speed Range(kmph)
Gear
O to 15
1
16 to 25
2
3
26 to 40
4
41 to 60
5
Above 61
Give speed input while the simulation is running & display the gear number.
Ans=>
Part II: IMPLEMENTATION OF CONTROL LOGIC FOR
GEAR SHIFT USING STATEFLOW
PROCESS:
1.Start simulink and create a blank model.
2. Search for CHART block in the stateflow
category of library browser.
3. Open the chart block and select the various features from the stateflow window.
4.Control logic for gear shift is such that it should change the gear when the speed increases of
decreases automatically. 5.After finishing the control logic run the stateflow and check the gear shift operation for an infinite
Blocks Used
1. Chart
A finite state machine is a representation of an event driven (reactive) system. In an event-driven system, the system responds to an event by making a transition
from one state (mode) to another. This transition
occurs if the condition defining the change is true.
2. Display
The Display block shows the value of the input data. You can specify the frequency of the display. For numeric input data, you can also specify the format of the
display.
3. Constant
The Constant block generates a real or complex constant value signal. Use this block to provide a constant signal input.
4. Lamp
The Lamp block displays a color indicating the value of the input signal. You can use the Lamp block with other Dashboard blocks to build an interactive
dashboard of controls and indicators for your model. You can specify pairs of input values and colors to
5. Rocker Switch:
The Rocker Switch block toggles the value of the connected block parameter between two values during simulation. For example, you can connect the Rocker S
witch block to a Switch block in your model and change its state during simulation.
6.Slider
The Slider block tunes the value of the connected block parameter during the simulation. For example, you can connect the Slider block to a Gain block in your model and adjust its value during the simulation. You can modify the range of the Slider block's scale to fit your data. Use the Slider block with other Dashboard blocks to create an interactive dashboard to control your model.
From slide block i.e Throttle pedal we can change value of vehicle speed while simulation is running.
Logic Explanation
The speed ranges from 0 to 100 and the slider is used to send the input. The 1st gear has speed values from O to 15 so the entry condition for the 1st gear is O<-speed and speed<=15 and the exit condition is when the speed greater than 15.
Similarly for 2nd
1. In the above control logic, first Engine is started from input switch E = O / 1 through Rocker switch which is power switch to make engine ON.Then next Gear_Shift_logic implemented through following states.
2. Five Gear State is created with state condition of gear (G) 1,2,3,4and 5 respectively and their transition is connected with speed range condition as shown.
3.The transitions condition for the gear shift is decided
as
Speed>15 shift to G = 2
Speed>25 shift to G = 3
Snood 10 chift to G-1
3.The transitions condition for the gear shift is decided
as
Speed>15 shift to G = 2
Speed>25 shift to G = 3
Speed >40 shift to G = 4
Speed>60 shift to G = 5 when the speed is
increasing from 0-60 kmph
similarly in reverse direction
Speed<60 shift to G = 4
Speed<40 shift to G = 3
Speed<25 shift to G = 2
Speed<15 shift to G = 1 when the speed is
decreasing from 60-0 Kmph
While simulating Gear_Shift_logic, Engine [E==1] condition given with various speed change values.
gear, the entry condition is 16<-speed and speed<=25 the exit condition is when speed<16 and speed>25. In the same way for each gear, the entry and the exit condition are specified and the out is mapped to the lamp and the display block.
At speed 72kmph which is above 61kmph gear 5 is implemented and Gear_fifth LED is glow green and display output as 1.
At speed 20kmph which is above 16kmph gear 2 is implemented and Gear_second LED is glow green and display output as 1.
At speed 48kmph which is above 40kmph gear 4 is implemented and Gear_fourth LED is glow green and display output as 1.
And thus all condition simulated through stateflow chart successfully.