longitudinal planner: disable change cost when stopped. not engaged or gas pressed (#23639)

* disable change cost completely on standstill and gas press

* cleanup

* set accel to zero

* clean up logic around standstill

* update ref
old-commit-hash: 428d412c1f

selfdrive/controls/lib/longitudinal_mpc_lib/long_mpc.py

@@ -219,19 +219,20 @@ class LongitudinalMpc:
     self.x0 = np.zeros(X_DIM)
     self.set_weights()
 
-  def set_weights(self):
+  def set_weights(self, prev_accel_constraint=True):
     if self.e2e:
       self.set_weights_for_xva_policy()
       self.params[:,0] = -10.
       self.params[:,1] = 10.
       self.params[:,2] = 1e5
     else:
-      self.set_weights_for_lead_policy()
+      self.set_weights_for_lead_policy(prev_accel_constraint)
 
-  def set_weights_for_lead_policy(self):
-    W = np.asfortranarray(np.diag([X_EGO_OBSTACLE_COST, X_EGO_COST, V_EGO_COST, A_EGO_COST, A_CHANGE_COST, J_EGO_COST]))
+  def set_weights_for_lead_policy(self, prev_accel_constraint=True):
+    a_change_cost = A_CHANGE_COST if prev_accel_constraint else 0
+    W = np.asfortranarray(np.diag([X_EGO_OBSTACLE_COST, X_EGO_COST, V_EGO_COST, A_EGO_COST, a_change_cost, J_EGO_COST]))
     for i in range(N):
-      W[4,4] = A_CHANGE_COST * np.interp(T_IDXS[i], [0.0, 1.0, 2.0], [1.0, 1.0, 0.0])
+      W[4,4] = a_change_cost * np.interp(T_IDXS[i], [0.0, 1.0, 2.0], [1.0, 1.0, 0.0])
       self.solver.cost_set(i, 'W', W)
     # Setting the slice without the copy make the array not contiguous,
     # causing issues with the C interface.
@@ -300,9 +301,8 @@ class LongitudinalMpc:
     self.cruise_min_a = min_a
     self.cruise_max_a = max_a
 
-  def update(self, carstate, radarstate, v_cruise, prev_accel_constraint=False):
+  def update(self, carstate, radarstate, v_cruise):
     v_ego = self.x0[1]
-    a_ego = self.x0[2]
     self.status = radarstate.leadOne.status or radarstate.leadTwo.status
 
     lead_xv_0 = self.process_lead(radarstate.leadOne)
@@ -330,10 +330,7 @@ class LongitudinalMpc:
     x_obstacles = np.column_stack([lead_0_obstacle, lead_1_obstacle, cruise_obstacle])
     self.source = SOURCES[np.argmin(x_obstacles[0])]
     self.params[:,2] = np.min(x_obstacles, axis=1)
-    if prev_accel_constraint:
-      self.params[:,3] = np.copy(self.prev_a)
-    else:
-      self.params[:,3] = a_ego
+    self.params[:,3] = np.copy(self.prev_a)
 
     self.run()
     if (np.any(lead_xv_0[:,0] - self.x_sol[:,0] < CRASH_DISTANCE) and

selfdrive/controls/lib/longitudinal_planner.py

@@ -58,7 +58,6 @@ class Planner:
 
   def update(self, sm):
     v_ego = sm['carState'].vEgo
-    a_ego = sm['carState'].aEgo
 
     v_cruise_kph = sm['controlsState'].vCruise
     v_cruise_kph = min(v_cruise_kph, V_CRUISE_MAX)
@@ -67,12 +66,16 @@ class Planner:
     long_control_state = sm['controlsState'].longControlState
     force_slow_decel = sm['controlsState'].forceDecel
 
-    prev_accel_constraint = True
-    if long_control_state == LongCtrlState.off or sm['carState'].gasPressed:
+    # Reset current state when not engaged, or user is controlling the speed
+    reset_state = long_control_state == LongCtrlState.off
+    reset_state = reset_state or sm['carState'].gasPressed
+
+    # No change cost when user is controlling the speed, or when standstill
+    prev_accel_constraint = not (reset_state or sm['carState'].standstill)
+
+    if reset_state:
       self.v_desired_filter.x = v_ego
-      self.a_desired = a_ego
-      # Smoothly changing between accel trajectory is only relevant when OP is driving
-      prev_accel_constraint = False
+      self.a_desired = 0.0
 
     # Prevent divergence, smooth in current v_ego
     self.v_desired_filter.x = max(0.0, self.v_desired_filter.update(v_ego))
@@ -86,9 +89,12 @@ class Planner:
     # clip limits, cannot init MPC outside of bounds
     accel_limits_turns[0] = min(accel_limits_turns[0], self.a_desired + 0.05)
     accel_limits_turns[1] = max(accel_limits_turns[1], self.a_desired - 0.05)
+
+    self.mpc.set_weights(prev_accel_constraint)
     self.mpc.set_accel_limits(accel_limits_turns[0], accel_limits_turns[1])
     self.mpc.set_cur_state(self.v_desired_filter.x, self.a_desired)
-    self.mpc.update(sm['carState'], sm['radarState'], v_cruise, prev_accel_constraint=prev_accel_constraint)
+    self.mpc.update(sm['carState'], sm['radarState'], v_cruise)
+
     self.v_desired_trajectory = np.interp(T_IDXS[:CONTROL_N], T_IDXS_MPC, self.mpc.v_solution)
     self.a_desired_trajectory = np.interp(T_IDXS[:CONTROL_N], T_IDXS_MPC, self.mpc.a_solution)
     self.j_desired_trajectory = np.interp(T_IDXS[:CONTROL_N], T_IDXS_MPC[:-1], self.mpc.j_solution)

selfdrive/test/longitudinal_maneuvers/plant.py

@@ -86,11 +86,10 @@ class Plant():
       radar.radarState.leadOne = lead
     radar.radarState.leadTwo = lead
 
-
     control.controlsState.longControlState = LongCtrlState.pid
     control.controlsState.vCruise = float(v_cruise * 3.6)
     car_state.carState.vEgo = float(self.speed)
-
+    car_state.carState.standstill = self.speed < 0.01
 
     # ******** get controlsState messages for plotting ***
     sm = {'radarState': radar.radarState,

selfdrive/test/process_replay/ref_commit

@@ -1 +1 @@
-24c4d6b8d49b42416f2ca6a59d563f7b8c984e2b
+60f58f58dae514eb8b956c03afa5f9b91c12a122