Water pump control apparatus

An apparatus for controlling a water pump having an engine that drives an impeller, a water intake port and delivery port, a water storage tank and a hose connected to the water intake port or the delivery port, the water pump being adapted to discharge water sucked through the water intake port from the delivery port when the impeller is driven by the engine, and to discharge water from or supply water to the water storage tank when connection of the hose switched between the intake port and delivery port by an operator, comprising:

• a first water level detector installed at an upper first height inside the water storage tank that outputs an A signal when a level of water in the water storage tank is at or higher than the first height and outputs a B signal when the level of the water in the water storage tank is lower than the first height;
• a second water level detector installed at a lower second height inside the water storage tank that outputs the A signal same as the A signal outputted from the first water level detector when the level of the water in the water storage tank is at or lower than the second height and outputs the B signal same as the B signal outputted from the first water level detector when the level of the water in the water storage tank is higher than the second height;
• an impeller controller adapted to control operation of the engine that drives the impeller of the water pump based on the signals outputted from the first and second water level detectors;
• and
• a connection switcher interposed between the first and second water level detectors and the impeller controller to switch connection state between the first and second water level detectors and the impeller controller,
• wherein the connection switcher has:
• an input terminal a connected to the first water level detector;
• an input terminal b connected to the second water level detector;
• an output terminal c connected to the impeller controller;
• an output terminal d connected to the impeller controller;
• and
• a switch provided to be operable by the operator,
• wherein the connection switcher switches the connection state between:
• a first connection state in which the input terminal a is connected to the output terminal c, and the input terminal b is connected to the output terminal d;
• and
• a second connection state in which the input terminal a is connected to the output terminal d, and the input terminal b is connected to the output terminal c, when the switch is operated by the operator,
• wherein the impeller controller controls operation of the engine solely based on the signals outputted from the output terminals c and d, irrespective of how the connection switcher is switched and without checking whether in water discharge mode or in water supply mode.