SYSTEM AND METHOD FOR CONTROLLING A VEHICLE HAVING A SINGLE-WIRE ACTUATOR
First Claim
1. A hybrid vehicle, comprising:
- an engine;
an electric heater;
a heater core;
a valve positioned to route coolant through at least one of the engine and the electric heater;
an auxiliary pump positioned to circulate coolant through the electric heater and the heater core, the auxiliary pump being configured to transmit a heartbeat signal while connected to a power source and a ground terminal; and
a controller configured to store a diagnostic code when the heartbeat signal is not received from the auxiliary pump within a predetermined interval of time.
1 Assignment
0 Petitions
Accused Products
Abstract
A system and method for determining functionality of a single signal wire actuator of a vehicle monitor the signal wire for a heartbeat signal after commanding the actuator and waiting for a self-diagnostic period. In one embodiment, a hybrid vehicle includes an engine, an electric heater, a heater core and a valve positioned to route coolant through an engine and/or an electric heater. An actuator positioned to circulate coolant through the electric heater and the heater core is configured to transmit a heartbeat signal while connected to a power source and a ground terminal. A vehicle controller may be configured to store a diagnostic code, start the engine and/or control the valve to selectively route coolant through the engine and the heater core in response to a heat request and the heartbeat signal not being received from the actuator within a predetermined interval of time.
18 Citations
20 Claims
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1. A hybrid vehicle, comprising:
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an engine; an electric heater; a heater core; a valve positioned to route coolant through at least one of the engine and the electric heater; an auxiliary pump positioned to circulate coolant through the electric heater and the heater core, the auxiliary pump being configured to transmit a heartbeat signal while connected to a power source and a ground terminal; and a controller configured to store a diagnostic code when the heartbeat signal is not received from the auxiliary pump within a predetermined interval of time. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A method for controlling a vehicle having an engine and an auxiliary pump, comprising:
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receiving a heat request; commanding the auxiliary pump on, the auxiliary pump being configured to transmit a heartbeat signal at all times while connected to a power source and a ground terminal; and storing a diagnostic code when the heartbeat signal is not received from the auxiliary pump within a predetermined interval of time after the pump has been commanded on. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method for controlling a vehicle having an engine and an auxiliary pump, comprising:
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commanding the auxiliary pump on, the auxiliary pump being configured to transmit a heartbeat signal at all times while connected to a power source and a ground terminal; and starting the engine to provide heat to the vehicle, in response to a heat request, when the heartbeat signal is not received from the auxiliary pump within a predetermined interval of time. - View Dependent Claims (16, 17, 18, 19, 20)
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Specification