Vehicle high voltage interlock startup
A vehicle high voltage system may include switches (e.g., IGBTs, contactors, relays, etc.), wires, a traction battery, electrical components with electrical properties and at least one controller. The at least one controller may be programmed to modulate a switch to provide a testing voltage for the electrical components, which is less than an operating voltage of the battery, and in response to a current flow associated with the testing voltage being less than a predetermined threshold, stop current flow between the battery and electrical components.
1. A vehicle comprising:
a traction battery having an operating voltage;
a power converter electrically connecting the battery and a motor; and
at least one controller programmed to
in response to activation of the motor, cause the converter to output a test voltage to the motor less than the operating voltage of the battery,
in response to output by the converter associated with the test voltage being indicative of a fault, stop current flow between the battery and motor, and
in response to the output falling within a predetermined range indicative of a connection between the battery and motor, connect the battery and motor such that current flows between the battery and motor to achieve the operating voltage.
2. The vehicle of claim 1 , wherein the output being greater than the predetermined range is indicative of a fault.
3. The vehicle of claim 1 , wherein the at least one controller is further programmed to, in response to the output falling within the predetermined range, activate a pre-charge circuit connected to the battery and motor.
4. The vehicle of claim 1 , wherein the test voltage is less than 60 volts and the operating voltage is greater than 100 volts.
5. The vehicle of claim 4 , wherein the test voltage is greater than 12 volts.
6. A method comprising:
modulating a switch connected with a battery and motor to provide a test voltage for the motor less than an operating voltage of the battery;
preventing current flow from the battery to the motor responsive to output associated with the test voltage being less than a predetermined amount; and
enabling current flow from the battery to the motor at the operating voltage responsive to the output falling within a predetermined range.
7. The method of claim 6 further comprising preventing current flow from the battery to the motor responsive to the output being greater than the predetermined range.
8. The method of claim 6 , wherein the test voltage is less than 60 volts and the operating voltage is greater than 100 volts.
9. The method of claim 8 , wherein the test voltage is greater than 12 volts.