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Improve prognosis by continuously updating virtual battery capacity (#335)

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Authored-by: premultiply
This commit is contained in:
premultiply 2020-09-14 08:27:05 +02:00 • committed by andig
parent 7f471cb887
commit df2f6a8de9
2 changed files with 18 additions and 6 deletions
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18
core/wrapper/socestimator.go
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@ -16,6 +16,7 @@ type SocEstimator struct {
estimate bool
capacity float64 // vehicle capacity in Wh cached to simplify testing
virtualCapacity float64 // estimated virtual vehicle capacity in Wh
socCharge float64 // estimated vehicle SoC
prevSoC float64 // previous vehicle SoC in %
prevChargedEnergy float64 // previous charged energy in Wh
@ -40,7 +41,8 @@ func (s *SocEstimator) Reset() {
s.prevSoC = 0
s.prevChargedEnergy = 0
s.capacity = float64(s.vehicle.Capacity()) * 1e3 // cache to simplify debugging
s.energyPerSocStep = s.capacity / 100
s.virtualCapacity = s.capacity / 0.9 // assume charge 90% efficiency
s.energyPerSocStep = s.virtualCapacity / 100
}
// RemainingChargeDuration returns the remaining duration estimate based on SoC, target and charge power
@ -62,7 +64,7 @@ func (s *SocEstimator) RemainingChargeDuration(chargePower float64, targetSoC in
}
// estimate remaining time
whRemaining := percentRemaining / 100 * s.capacity
whRemaining := percentRemaining / 100 * s.virtualCapacity
return time.Duration(float64(time.Hour) * whRemaining / chargePower).Round(time.Second)
}
@ -73,7 +75,14 @@ func (s *SocEstimator) RemainingChargeDuration(chargePower float64, targetSoC in
func (s *SocEstimator) SoC(chargedEnergy float64) (float64, error) {
f, err := s.vehicle.ChargeState()
if err != nil {
return s.socCharge, err
s.log.WARN.Printf("updating soc failed: %v", err)
// try to recover from temporary vehicle-api errors
if s.prevSoC == 0 { // never received a soc value
return s.socCharge, err
}
f = s.prevSoC // recover last received soc
}
s.socCharge = f
@ -86,7 +95,8 @@ func (s *SocEstimator) SoC(chargedEnergy float64) (float64, error) {
// calculate gradient, wh per soc %
if socDelta > 1 && energyDelta > 0 && s.prevSoC > 0 {
s.energyPerSocStep = energyDelta / socDelta
s.log.TRACE.Printf("soc gradient updated: energyPerSocStep: %0.0fWh, virtualBatCap: %0.1fkWh", s.energyPerSocStep, s.energyPerSocStep*100/1e3)
s.virtualCapacity = s.energyPerSocStep * 100 / 1e3
s.log.TRACE.Printf("soc gradient updated: energyPerSocStep: %0.0fWh, virtualCapacity: %0.1fkWh", s.energyPerSocStep, s.virtualCapacity)
}
// sample charged energy at soc change, reset energy delta

6
core/wrapper/socestimator_test.go
View file

@ -12,7 +12,8 @@ import (
func TestRemainingChargeDuration(t *testing.T) {
ctrl := gomock.NewController(t)
vehicle := mock.NewMockVehicle(ctrl)
vehicle.EXPECT().Capacity().Return(int64(10))
//9 kWh userBatCap => 10 kWh virtualBatCap
vehicle.EXPECT().Capacity().Return(int64(9))
ce := NewSocEstimator(util.NewLogger("foo"), vehicle, false)
ce.socCharge = 20.0
@ -28,7 +29,8 @@ func TestRemainingChargeDuration(t *testing.T) {
func TestSoCEstimation(t *testing.T) {
ctrl := gomock.NewController(t)
vehicle := mock.NewMockVehicle(ctrl)
vehicle.EXPECT().Capacity().Return(int64(10))
//9 kWh userBatCap => 10 kWh virtualBatCap
vehicle.EXPECT().Capacity().Return(int64(9))
ce := NewSocEstimator(util.NewLogger("foo"), vehicle, true)
ce.socCharge = 20.0