Planning T(r)ips for Hybrid Electric Vehicles
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1 Planning T(r)ips for Hybrid Electric Vehicles How to Drive in the 21st Century 16.S949 Student Lecture May 14 th, 2012
2 Example Origin: Sid-Pac Destination: Revere St. Meet Peng in 4 minutes. Need to find a path. Planning Trips for Hybrid Electric Vehicles 2
3 Example: least-time path Google Maps gives the path that minimizes trip duration. Duration: 3.6 minutes. Fuel: 0.193L. Planning Trips for Hybrid Electric Vehicles 3
4 Example: least-fuel path We can find a path that minimize fuel usage [1]. Duration: 5 minutes. Fuel: 0.152L. That s 25% saving! But he will be late. [1]R. K. Ganti, N. Pham, H. Ahmadi, S. Nangia, and T. F. Abdelzaher. Greengps: a participatory sensing fuel efficient maps application. In Proc. of MobiSys 10, pages , San Francisco, CA, Planning Trips for Hybrid Electric Vehicles 4
5 Example: least-fuel path that is on-time We want to find the path that minimizes fuel usage within the timing constraint. Duration: 4 minutes. Fuel: 0.185L. But how? Planning Trips for Hybrid Electric Vehicles 5
6 Planning for Hybrid Electric Vehicles Motivation & Problem Formulation The Best Route The Best Driving Style Examples and Summary Source: D. J. C. MacKay, Sustainabl e Energy Without the Hot Air, UIT Cambridge, Planning Trips for Hybrid Electric Vehicles 6
7 Price of fuel Hybrid cars are popular! Toyota Prius was Japan s best-selling car in ,528 units sold over the year. Why do people like hybrid vehicles? 50% increase in City/Hwy MPG. 40% reduction in carbon emission. Year Planning Trips for Hybrid Electric Vehicles 7
8 The hybrid system Electric motor (batteries) and gasoline engine: Saving energy through: Keep the engine working in its efficient zone. Avoid low speed crawling with ignited engine. Source: G. Davies, Planning Trips for Hybrid Electric Vehicles 8
9 Mile Per Gallon Superb low speed MPG 90 Fuel Consumption Rate: Toyota Prius and Volkswagen Golf MPG (Prius) MPG (Golf) Source: US Environmental Protection Agency and metrompg.com Mile Per Hour Planning Trips for Hybrid Electric Vehicles 9
10 Routing affects fuel economy Planning Trips for Hybrid Electric Vehicles 10
11 Driving style affects fuel economy Percent improvement via route-independent methods Avoid aggressive driving: 5-33%. Keep optimal fuel economy speed: 7-23%. Remove excess weight: 1-2%/100lb. Avoid excessive idling: L/min. Fuel Economy Benefit Drive Sensibly Observe Speed Limit Avoid Excessive Idling Remove Excess Weight 0% 2% 4% 6% 8% 10% 12% 14% 16% 18% 20% Source: US Department of Energy, Planning Trips for Hybrid Electric Vehicles 11
12 A driving advisory system Input: Where you want to go in how long. A map of the road network with traffic conditions. A model of the hybrid car s dynamics. Output: Recommend the route that satisfies timing constraints while minimizing fuel consumption. Provide driving guidance for avoiding aggressive driving and over-speed cruising. Image Source: Pratap Tokekar, Nikhil Karnad, and Volkan Isler.Energyoptimal velocity profiles for car-like robots. In ICRA, 2011(submitted). Planning Trips for Hybrid Electric Vehicles 12
13 The constrained optimization problem Objective: Minimize the fuel consumption of a trip. By: Choosing a smart route: Seg 1, Seg 2,...,Seg N. Using proper acceleration and braking: Acc 1, Dec 1,..., Acc N, Dec N. And economy cruising speed: Vel 1, Vel 2,...,Vel N. To minimize: TotalGas = Fuel(Seg k, Acc k, Dec k, Vel k ) k=1 N Planning Trips for Hybrid Electric Vehicles 13
14 The constrained optimization problem Time: k=1 N Time(Seg k, Acc k, Dec k, Vel k ) < TimeLimit Traffic: Vel k < SpeedLimit k Vehicle dynamics: k, Acc k < MaxAcc, Dec k < MaxBrake A complete path connecting the origin and destination. Planning Trips for Hybrid Electric Vehicles 14
15 The constrained optimization problem Objective: Minimize the fuel consumption of a trip. By: Choosing a smart route: Seg 1, Seg 2,...,Seg N. Using proper acceleration and braking: Acc 1, Dec 1,..., Acc N, Dec N. And economy cruising speed: Vel 1, Vel 2,...,Vel N. 1. Optimize the route. 2. Optimize the driving strategy. Planning Trips for Hybrid Electric Vehicles 15
16 Planning for Hybrid Electric Vehicles Motivation & Problem Formulation The Best Route The Best Driving Style Examples and Summary Planning Trips for Hybrid Electric Vehicles 16
17 Vehicle routing problems Find the best set of road segments from the map: For example, Stata Center to Logan Airport. Planning Trips for Hybrid Electric Vehicles 17
18 Vehicle routing problems Find the best set of road segments from the map: Assume that we already know the fuel consumption and duration of each road segment. Driving Time: Time(Seg k ) e.g. 15 minutes Fuel Consumption: Fuel(Seg k ) e.g L Planning Trips for Hybrid Electric Vehicles 18
19 Definition To minimize: Subject to: TotalGas = Fuel(Seg k ) k=1 N k=1 N Time(Seg k ) < TotalTime An optimal constraint satisfaction problem! Planning Trips for Hybrid Electric Vehicles 19
20 Exact solution Time Constraint Constrained Bellman-Ford [1] routing algorithm. Treat the problem as a Multi-objective optimization. Search the entire Pareto Set. Using Breadth-first search and record all paths that are not dominated Exponential worst-case complexity Fuel Consumption [1] J. Jaffe, Algorithms for finding path with multiple constraints, Networks, vol. 14, pp , Planning Trips for Hybrid Electric Vehicles 20
21 Faster methods? Recall: Dijkstra s algorithm. Solves single-source shortest path problems. Successively update the distance to vertices with newly discovered shortest route. D 9 F C 11 A 7 10 E B 15 Planning Trips for Hybrid Electric Vehicles 21
22 Dijkstra s algorithm Recall: the Dijkstra s algorithm. Solves single-source shortest path problems. Successively update the distance to vertices with newly discovered shortest route. A D 14 2 B C F 6 E Planning Trips for Hybrid Electric Vehicles 22
23 Dijkstra s algorithm Recall: the Dijkstra s algorithm. Solves single-source shortest path problems. Successively update the distance to vertices with newly discovered shortest route. A D 14 2 B C F 6 E 22 Planning Trips for Hybrid Electric Vehicles 23
24 Dijkstra s algorithm Recall: the Dijkstra s algorithm. Solves single-source shortest path problems. Successively update the distance to vertices with newly discovered shortest route. A D B C F 6 E Planning Trips for Hybrid Electric Vehicles 24
25 Dijkstra s algorithm Recall: the Dijkstra s algorithm. Solves single-source shortest path problems. Successively update the distance to vertices with newly discovered shortest route C A B 11 9 D F E 15 Planning Trips for Hybrid Electric Vehicles 25
26 Dijkstra s algorithm Recall: the Dijkstra s algorithm. Solves single-source shortest path problems. Successively update the distance to vertices with newly discovered shortest route C A B 11 9 D F E 15 Runs in polynomial time: O V 2 But, it does not guarantee satisfying the timing constraint! Planning Trips for Hybrid Electric Vehicles 26
27 Backward Forward Heuristic (BFH) algorithm Modified from Dijkstra s algorithm. Using Dijkstra s algorithm to construct shortest path trees for both fuel consumption and time, starting from the end. Planning Trips for Hybrid Electric Vehicles 27
28 Backward Forward Heuristic (BFH) algorithm Modified from Dijkstra s algorithm. Using Dijkstra s algorithm to construct shortest path trees for both fuel consumption and time, starting from the end. D 9L; 2h F 14L; 2h 2L; 0.2h 6L; 1h 9L; 2h C 11L; 1h A 7L; 0.5h 10L; 1h E B 15L; 3h Planning Trips for Hybrid Electric Vehicles 28
29 BFH: Create least-fuel tree and least-time tree A Modified from Dijkstra s algorithm. Using Dijkstra s algorithm to construct shortest path trees for both fuel consumption and time, starting from the end. 2h D 2h 0.2h 2h 2h 2h C A 1h 0.5h 0L B 9L D 9L F 3h 2L 14L 6L 11L 9L C 11L 10L E 6L 7L B 15L 21L F 0h 1h 1h E 1h 3h Planning Trips for Hybrid Electric Vehicles 29
30 BFH: Create least-fuel tree and least-time tree Modified from Dijkstra s algorithm. Using Dijkstra s algorithm to construct shortest path trees for both fuel consumption and time, starting from the end. 9L; 2h D 9L; 2h F 0L; 0h 14L; 2h 9L; 2h 2L; 0.2h C 11L; 2h 11L; 1h 6L; 1h A 7L; 0.5h 10L; 1h E 6L; 1h B 21L; 3h 15L; 3h Planning Trips for Hybrid Electric Vehicles 30
31 BFH: Restart from the beginning Then start from the beginning, choose between the least time path and least fuel path to proceed. A If the LFP satisfies timing constraint, proceed with it. Otherwise, proceed with LTP. 14L; 2h 9L; 2h D 7L; 0.5h 9L; 2h 2L; 0.2h B 9L; 2h C 11L; 2h 10L; 1h 21L; 3h 11L; 1h 15L; 3h F 0L; 0h 6L; 1h E 6L; 1h Planning Trips for Hybrid Electric Vehicles 31
32 BFH: Propagate with timing constraint If the LFP satisfies timing constraint, proceed with it. Otherwise, proceed with LTP. If the timing constraint is 4h. 9L; 2h D 9L; 2h F 0L; 0h 14L; 2h 9L; 2h 2L; 0.2h C 11L; 2h 11L; 1h 6L; 1h A 7L; 0.5h 10L; 1h E 6L; 1h B 15L; 3h 21L; 3h Planning Trips for Hybrid Electric Vehicles 32
33 BFH: Propagate with timing constraint If the LFP satisfies timing constraint, proceed with it. Otherwise, proceed with LTP. If the timing constraint is 3.5h. 9L; 2h D 9L; 2h F 0L; 0h 14L; 2h 9L; 2h 2L; 0.2h C 11L; 2h 11L; 1h 6L; 1h A 7L; 0.5h 10L; 1h E 6L; 1h B 15L; 3h 21L; 3h Planning Trips for Hybrid Electric Vehicles 33
34 BFH: Propagate with timing constraint If the timing constraint is 3.5h. A 14L; 2h D 9L; 2h 7L; 0.5h 9L; 2h 9L; 2h 2L; 0.2h 11L; 2h C 10L; 1h B 21L; 3h 11L; 1h 15L; 3h F 0L; 0h 6L; 1h 6L; 1h E Planning Trips for Hybrid Electric Vehicles 34
35 BFH: Propagate with timing constraint If the timing constraint is 3.5h. A 14L; 2h D 9L; 2h 7L; 0.5h 9L; 2h 9L; 2h 2L; 0.2h 11L; 2h C 10L; 1h B 21L; 3h 11L; 1h 15L; 3h F 0L; 0h 6L; 1h 6L; 1h E Planning Trips for Hybrid Electric Vehicles 35
36 BFH: Propagate with timing constraint If the timing constraint is 3.5h. A 14L; 2h D 9L; 2h 7L; 0.5h 9L; 2h 9L; 2h 2L; 0.2h 11L; 2h C 10L; 1h B 21L; 3h 11L; 1h 15L; 3h F 0L; 0h 6L; 1h 6L; 1h E Planning Trips for Hybrid Electric Vehicles 36
37 Backward Forward Heuristic (BFH) analysis The complexity is three times of Dijkstra s algorithm. Usually generates suboptimal paths that satisfies timing constraint. The forward procedure only makes locally optimal decision. BFH paths usually less than 10% more expensive than optimal paths [1]. [1] H. F. Salama, D. S. Reeves, and Y. Viniotis, A distributed algorithm for delay-constrained unicast routing, in Proc. IEEE INFOCOM 97, Japan, pp Planning Trips for Hybrid Electric Vehicles 37
38 Runtime performance Log Runtime (ms) The algorithm is efficient on large problems BFH Runtime Least Time Runtime Number of Nodes Planning Trips for Hybrid Electric Vehicles 38
39 Runtime performance We benchmark the algorithm on various problems ranging from 100 nodes to nodes. Planning Trips for Hybrid Electric Vehicles 39
40 Quality of results Improvements in Fuel Efficiency If we want to spend 20-40s more on the trip: Number of Nodes Planning Trips for Hybrid Electric Vehicles 40
41 Planning for Hybrid Electric Vehicles Motivation & Problem Formulation The Best Route The Best Driving Style Examples and Summary Planning Trips for Hybrid Electric Vehicles 41
42 Previously: Vehicle Routing Problems Find the best set of road segments from the map: Assume that we already know the fuel consumption and duration of each road segment. Driving Time: Time(Seg k ) e.g. 15 minutes Fuel Consumption: Fuel(Seg k ) e.g L Planning Trips for Hybrid Electric Vehicles 42
43 Finding Fuel(Seg k ) and Time(Seg k ) Depends on driving behavior Depends on power management traditional: P req = P ice hybrid: P req = P ice + P em additional degree of freedom in the power split P em > 0 : P em < 0 : battery discharging battery charging through regenerative braking or ICE driving EM Planning Trips for Hybrid Electric Vehicles 43
44 Assumptions and solution strategy Assume: v k t = F trap Acc k, Vel k, Dec k. Strategy: optimize the fuel consumption of each segment. Optimize a velocity profile (over P ice,k, P em,k ) Optimize the velocity profile (over Acc k, Dec k ) Planning Trips for Hybrid Electric Vehicles 44
45 Optimize a velocity profile: problem statement Input: v Objective: Fuel(Seg, v ) = min Δm f P em ( ) Output: P ice, P em ( ), Fuel(Seg, v ) Charge-sustaining constraints: SOC min < SOC < SOC max SOC start = SOC end = 1 2 (SOC min + SOC max ) Planning Trips for Hybrid Electric Vehicles 45
46 Optimize a velocity profile: modeling power flow Mechanical power: P req = P ice + P em P req = F req v = C D v 2 + M dv dt v Fuel power: dm f dt = 1 H f P ice η ice (P ice ) Electric power: dsoc dt = 1 Q max V batt P em η em (P em ) Planning Trips for Hybrid Electric Vehicles 46
47 Optimize a velocity profile: solution by ECMS Fuel is to gold as battery charge is to cash. fuel tank = personal stash of gold charge battery = put gold/cash into the bank discharge battery = take cash out of the bank Goal: retain as much gold as possible. Strategy: express everything in terms of gold. Equivalent Consumption Minimization Strategy (ECMS) Source: L. Serrao, S. Onori, and G. Rizzoni, A Comparative Analysis of Energy Management Strategies for Hybrid Electric Vehicles, Journal of Dynamic Systems, Measurement, and Control, Vol. 133, May Planning Trips for Hybrid Electric Vehicles 47
48 Optimize a velocity profile: ECMS algorithm Pontryagin s minimum principle: if P em ( ) is globally optimal i.e. minimizes Δm f = m f dt, then at each time t, P em t is locally optimal w.r.t. m f,e t = m f t + λ(t)m b,e t. m b,e t = 1 H f P em η em (P em ) Assume λ is constant. (actually depends on internal battery parameters) Source: L. Serrao, S. Onori, and G. Rizzoni, A Comparative Analysis of Energy Management Strategies for Hybrid Electric Vehicles, Journal of Dynamic Systems, Measurement, and Control, Vol. 133, May Planning Trips for Hybrid Electric Vehicles 48
49 Optimize a velocity profile: ECMS algorithm Minimize: m f,e t = m f t + λ m b,e t. Algorithm: 1. Select λ. Optimize P em (t) at all times t. 2. Simulate P em ( ) to determine SOC(end). 3. Iterate on 1 and 2, using the Shooting Method to ensure SOC start = SOC(end). Illustration of the Shooting Method Source: Planning Trips for Hybrid Electric Vehicles 49
50 Optimize a velocity profile: ECMS validation Dynamic Programming ECMS Source: P. Pisu and G. Rizzoni, A Comparative Study of Supervisory Control Strategies for Hybrid Electric Vehicles, IEEE Transactions on Control Systems Technology, Vol. 15, No. 3, May Planning Trips for Hybrid Electric Vehicles 50
51 Optimize a velocity profile: ECMS validation Dynamic Programming Rule-based Finite-State Machine (FSM) Source: P. Pisu and G. Rizzoni, A Comparative Study of Supervisory Control Strategies for Hybrid Electric Vehicles, IEEE Transactions on Control Systems Technology, Vol. 15, No. 3, May Planning Trips for Hybrid Electric Vehicles 51
52 Optimize a velocity profile: ECMS validation Source: C. Musardo, G. Rizzoni, and B. Staccia, A-ECMS: An adaptive Algorithm for Hybrid Elecric Vehicle Energy Management, Proceedings of the 44 th IEEE Conference on Decision and Control, Source: P. Pisu and G. Rizzoni, A Comparative Study of Supervisory Control Strategies for Hybrid Electric Vehicles, IEEE Transactions on Control Systems Technology, Vol. 15, No. 3, May Planning Trips for Hybrid Electric Vehicles 52
53 Optimize the velocity profile Input: Dist, SpeedLimit Objective: Fuel Seg = min Fuel(Seg, v ) Subject to constraints: Acc, Dec 0 < Acc < MaxAcc, 0 < Dec < MaxBrake Vel = SpeedLimit v = F trap (Acc, Vel, Dec) v t dt = Dist Output: v ( ) Fuel Seg Time Seg = min t v t = 0 t > 0 Planning Trips for Hybrid Electric Vehicles 53
54 Summary of algorithms BFH v (t) optimizer ECMS Time(Seg) Fuel(Seg) v(t) P req = P ice + P em Planning Trips for Hybrid Electric Vehicles 54
55 Planning for Hybrid Electric Vehicles Motivation & Problem Formulation The Best Route The Best Driving Style Examples and Summary Planning Trips for Hybrid Electric Vehicles 55
56 Recall: The Driving Problem We would like to get to the destination with minimum fuel consumption through: Selecting the best route. Optimizing the driving style. In addition, we want to satisfy the timing constraints. Drive to the Logan airport from the Stata Center in 15 minutes. Planning Trips for Hybrid Electric Vehicles 56
57 Velocity (km/h) Results: hybrid car Path selected by the algorithm. Driving profile Distance (km) Planning Trips for Hybrid Electric Vehicles 57
58 Non-hybrid cars Volkswagen Golf Planning Trips for Hybrid Electric Vehicles 58
59 Non-hybrid cars Path selected by the algorithm. Driving profile Planning Trips for Hybrid Electric Vehicles 59
60 Summary Problems solved: How to select the path that minimize fuel cost, while satisfying timing constraints. The best driving style/modes that minimize the fuel consumption. Remarks The modeling and optimization of energy systems can be very hard. Suboptimal approaches may save a lot of time. Hybrid cars (and ECO driving modes) do help save fuel! Planning Trips for Hybrid Electric Vehicles 60
61 Byproduct Fuel efficient path generator: Compute a path for your trip based on OpenStreetMap Database, then project on Google Map. Satisfies your timing constraint while minimizing fuel consumption. Available for Prius and Golf, in Cambridge and Boston area. Planning Trips for Hybrid Electric Vehicles 61
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