scripting: Added generator cutoff for EFI Skypower

libraries/AP_Scripting/drivers/EFI_SkyPower.lua

@@ -74,7 +74,7 @@ end
 local efi_backend = nil
 
 -- Setup EFI Parameters
-assert(param:add_table(PARAM_TABLE_KEY, PARAM_TABLE_PREFIX, 15), 'could not add EFI_SP param table')
+assert(param:add_table(PARAM_TABLE_KEY, PARAM_TABLE_PREFIX, 16), 'could not add EFI_SP param table')
 
 --[[
   // @Param: EFI_SP_ENABLE
@@ -207,6 +207,16 @@ local EFI_SP_GEN_CTRL  = bind_add_param('GEN_CRTL', 13, 1)
 --]]
 local EFI_SP_RST_TIME  = bind_add_param('RST_TIME', 14, 2)
 
+--[[
+  // @Param: EFI_SP_LOAD_LIM
+  // @DisplayName: SkyPower EFI generator cutoff engine load
+  // @Description: SkyPower EFI generator cutoff engine load. If the engine target load is above this limit, the generator will be turned off, to alleviate the engine load. To disable this feature set this value to zero.
+  // @Range: 0 100
+  // @User: Standard
+  // @Units: %
+--]]
+local EFI_SP_LOAD_LIM  = bind_add_param('LOAD_LIM', 15, 0)
+
 if EFI_SP_ENABLE:get() == 0 then
    gcs:send_text(0, string.format("EFISP: disabled"))
    return
@@ -547,6 +557,13 @@ local function engine_control(_driver)
           return
        end
        local gen_state = rc:get_aux_cached(EFI_SP_GEN_FN:get())
+       -- Stop the generator if the engine is working at high load.
+       local load_limit = EFI_SP_LOAD_LIM:get()
+       if load_limit >0 then
+         if target_load > load_limit then
+            gen_state = 0
+         end
+       end
        if gen_state == 0 and generator_started then
           generator_started = false
           gcs:send_text(0, string.format("EFISP: stopping generator"))

libraries/AP_Scripting/drivers/EFI_SkyPower.md

@@ -60,6 +60,12 @@ driver will monitor engine RPM when the engine is started and if it
 drops below this value then an engine start will be sent to restart
 the engine.
 
+## EFI_SP_LOAD_LIM
+This is a threshold on the target engine load. Past this limit, the generator
+will be stopped, in order to reduce the engine load and route more power to
+the thruster.
+To disable this feature set this value to zero.
+
 # Operation
 
 This driver should be loaded by placing the lua script in the