HYBRID VEHICLE CONTROL UTILIZING GRADE DATA
First Claim
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1. A method of controlling a hybrid vehicle having a step ratio transmission, the method comprising:
- receiving data indicative of a grade profile of an anticipated route;
adjusting first shift criteria for the transmission based on the received data to generate second shift criteria, wherein operating the transmission according to the first shift criteria as the vehicle travels over the anticipated route at a speed substantially equal to a current speed of the vehicle would result in an upshift and a downshift of the transmission; and
operating the transmission according to the second shift criteria without shifting the transmission as the vehicle travels over the anticipated route at the speed.
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Abstract
A method of controlling a hybrid vehicle having a step ratio transmission is disclosed. The method utilizes terrain data to reduce the number of shift events. The method comprises receiving data indicative of a grade profile of an anticipated route, identifying a forecast shift sequence comprising a forecast downshift event and an adjacent forecast upshift event, and adjusting the shift criteria based on the time between the forecast shift events, the road grade between the forecast shift events, and the state of a storage battery.
22 Citations
20 Claims
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1. A method of controlling a hybrid vehicle having a step ratio transmission, the method comprising:
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receiving data indicative of a grade profile of an anticipated route; adjusting first shift criteria for the transmission based on the received data to generate second shift criteria, wherein operating the transmission according to the first shift criteria as the vehicle travels over the anticipated route at a speed substantially equal to a current speed of the vehicle would result in an upshift and a downshift of the transmission; and operating the transmission according to the second shift criteria without shifting the transmission as the vehicle travels over the anticipated route at the speed. - View Dependent Claims (2, 3, 4, 5)
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6. A method of controlling a hybrid vehicle driveline comprising:
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identifying a future transmission downshift condition based on road grade data describing an uphill slope; and in response to the condition, commanding an electric machine to increase torque output such that a downshift of a transmission is precluded when the vehicle is ascending the uphill slope at a substantially constant speed. - View Dependent Claims (7, 8, 9, 10, 11, 12)
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13. A hybrid vehicle comprising:
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an engine having a driveshaft; a traction motor driveably connected to the driveshaft and electrically connected to a battery; a shiftable transmission having an input driveably connected to the driveshaft and an output driveably connected to vehicle wheels; and a controller programmed to initiate transmission downshifts and upshifts based on a set of shift criteria, identify a location of a future transmission downshift condition based on the shift criteria and road grade data describing an uphill slope, and adjust the shift criteria such that an upshift is precluded when a distance to the location is less than a threshold distance. - View Dependent Claims (14, 15, 16, 17, 18, 19, 20)
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Specification