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US 11,551,489 B1Granted
Methods and systems for coolant system diagnostics
AssigneeFord Global Technologies, LLC
InventorsSitaram Rejeti, Adam Krach, Robert Roy Jentz
Life of this patent
Estimating the term…
Abstract
Methods and systems are provided for a coolant system. In one example, a method may include diagnosing a condition of a pump of the coolant system based on a temperature change of coolant. The diagnostic may determine if the pump is stuck on or off.
Claims20
A method, comprising:
- determining a temperature change of a coolant across a heater core based on sensor data, including based on temperature of coolant entering the heater core and temperature of coolant leaving the heater core;
- and
- diagnosing a coolant pump based on only the temperature change, wherein the coolant pump is positioned in a hybrid vehicle cooling system including one or more of an engine cooling system and a cabin cooling system, the hybrid vehicle including an engine.
A system, comprising:
- a pump configured to pump coolant to an engine heating loop and a cabin heating loop, wherein the pump is the only pump of the system;
- and
- a controller with computer-readable instructions stored on non-transitory memory thereof that when executed enable the controller to:
- execute a diagnostic of the pump by activating cabin heating and sensing a temperature change of the coolant across a heater core in response to a cold-start not occurring and the diagnostic being requested, wherein the sensed temperature change is based on sensed temperature of coolant entering the heater core and sensed temperature of coolant leaving the heater core.
1 more element
A method for an engine system comprising a main pump and a secondary pump arranged in a coolant system, the method, comprising:
- deactivating the main pump;
- deactivating the secondary pump;
- and
- monitoring a temperature change of coolant in a cabin heating loop of the coolant system to diagnose a condition of the secondary pump, the temperature change based on a coolant temperature sensed by an engine coolant temperature sensor and a temperature sensor downstream of a heater core relative to a direction of coolant flow.
1 more element
Dependencies are inferred from the claim text.