46
1 © 2015 The MathWorks, Inc. Verification, Validation and Test in Model Based Design Manohar Reddy
1© 2015 The MathWorks, Inc.
Verification, Validation and Test
in Model Based Design
Manohar Reddy
2
Continuous
Model & Code
System & Component
Dynamic testing & Static analysis
Test & Verification
Model & Code
Dynamic testing & Static analysis
System & Component
Productivity
continuous
Needs verification!
Quality
+
3
Multi-Mode Hybrid Electric Vehicle
Higuchi, N., Sunaga, Y., Tanaka, M., Shimada, H.: Development of a New Two-Motor Plug-In Hybrid
System, SAE 2013-01-1476 (2013)
EV Mode Serial HEV Mode Engine Mode
with Model Based Design
4
Define
Requirements
System-Level
Specification
Subsystem
Design
Battery
Engine
Energy Management
Subsystem
Implementation
Production
C-Code
Simulink
Plant Model
Subsystem
Integration & Test
Multi-Mode Hybrid Electric Vehicle
Complete
Integration &Test
System-Level
Integration & Test
Failure
5
Continuous Test and Verification Framework
Repeat
Slice
Fix
Check
Test
Reproduce the failure at the simulation level
Isolate the problematic behavior
Fix and Perform Unit Testing
Check for further design errors
Test Systematically and Test Completely
Productivity
+Quality
continuous
needs verification!
6
Reproduce the Failure in Simulation
Confirm the problem
In the Lab/Desktop
Simulation
Repeat
Slice
Fix
Check
Test
7
Failure Report
Reproduce Failure
Drive cycle
8
Simulation Environment
Controller Plant
9
Modeling the Test
Controller Plant
Drive cycle
10
Modeling the Test
Safety Property
Engine RPM must remain
within operating bounds limits
Controller Plant
11
Battery State of Charge
Controller Plant
Sweep from 100% to 50%
Initial state of charge?
12
13
Model Slicing: Isolate the problematic behavior
Simulation
Scenario
Isolate the problem
Repeat
Slice
Fix
Check
Test
14
Challenge of Understanding Behavior
Complexity of Plant
15
Challenge of Understanding Behavior
Complexity of Plant
Complexity of Controller
16
Challenge of Understanding Behavior
Complexity of Plant
Complexity of Controller
Complexity of Dynamics
Turning
backwards
17
Model Slicing
18
Complete Model Slicer Workflow
Original
Design
Model
Highlighted
Model
Slice
Model
Updated Slice
Model
Identify
Interest
Iterate
Create
Slice Model
MBD Work:
• Simulate/Debug
• Formal analysis
• Update
Incorporate
Changes
19
Controller
Plant
Isolating Troubling Behavior with Model Slicer
Simulation
Scenario
Model Slicer Area of Interest
Highlight of
Relevant Parts
Stateflow
Highlighting
Original
Design Model
Highlighted
Model
Slice
Model
Updated Slice
Model
Identify
Interest
Iterate
Create
Slice Model MBD Work
Incorporate
Changes
20
Fixing the failure and Unit Testing
Simulation
Scenario
Repeat & isolate the problem
…
Fix faulty
components
Repeat
Isolate
Fix
Check
Test
21
State Synchronization Error
Missing Transition
Isolate and Fix
Engine Turning Backwards
Turning
backwards
22
Unit Testing Workflow
Main Model
1. Separate
2. Reproduce
Bug and Fix
4. Synchronize 3. Confirm
Test Harness
23
24
In-model Verification
Isolate Component in Test
HarnessVerification Result streamed to
Data Inspector
In-model Verification with verify keyword
25
Check for further design errors
Simulation
Scenario
Repeat & isolate the
problem
…
Fix faulty components
…
Check
everything
Repeat
Isolate
Fix
Check
Test
26
Develop a Robust Design with
Static Checking
Model Advisor Model Metrics
Simulink Design Verifier
Property
Proving
Test
Generation
Static Analysis Capabilities
Design Error
Detection
27
Find Hidden Issues with
Design Error Detection
U: [0,10]
h1 = 15
h2 = 5
Transition not possible
given range of u, h1, h2
28
Demo
29
Cond1 Cond2
~Cond1 ~Cond2
30
Cond1 Cond2
~Cond1 ~Cond2X
31
Fixing-as-you go
Demo
32
Prevent errors by
Fixing-as-you go
Edit-time checking
– Simulink
– Stateflow
– Modeling Standards
Prohibited blocks violations
Block and port name violations
Invalid port name Duplicate Data StoreMissing Default Transition
Customize rules to
corporate standards
33
Test : Systematically and Completely
Simulation
Scenario
Repeat & isolate the problem
…
Fix faulty components
…
Check everything
…
Test Systematically
and
Test Completely
Repeat
Isolate
Fix
Check
Test
34
Test Manager PlatformSystematic authoring, management, execution,
and reporting of test cases
Unites together a broad set of
capabilities
Simulink Test
35
MATLAB Script Criteria
36
Value
Tolerance
Time
Tolerance
37
Top-It-Off Workflow
Run Existing Tests
Aggregate Coverage
1
Simulink Design Verifier
Generate Test Cases
2
Run New Tests
Aggregate Coverage
3
38
39
Any continuous integration system that supports
Test Anything Protocol (TAP)
Integration with Test Automation Servers
40
Reuse model-based tests
Equivalence testing
Code Coverage
Code-to-Model Verification
C
Dynamic
Test Manager
Software-In-Loop
(SIL)
Code Generator
Static
Polyspace
41
Equivalence Checking and Code Coverage (Software-In-Loop)
42
Justification for Code Coverage
Justify
43
Continuous Test and Verification Framework helps to…
Repeat
Slice
Fix
Check
Test
Reproduce the failure in simulation
Isolate the problematic behavior
Fix and Perform Unit Testing
Check for further design errors
Test Systematically and Test
Completely
“Reactively” Reproduce the Field Issues
in Simulation
“Proactively” Prove that Implementation
satisfies Requirements
Check
Fix
Slice
Test
Prove
Check for design errors early
Fix and Perform Unit Testing
Isolate the problematic behavior to
simplify debugging
Test Systematically and Test
Completely
Prove Safety Properties/Requirements
44
Model Based Design helps to…
Productivity
+Quality
Check
Fix
Slice
Test
Prove
Continuous Test &
Verification
Repeat
Slice
Fix
Check
Test
45
MathWorks Training Offerings
http://www.mathworks.com/services/training/
46
Speaker Details
Manohar Reddy
Email: [email protected]
Contact MathWorks India
Call: 080-6632-6000
Email: [email protected]
