Method and system for providing a voting strategy for determining a mode state in a shift-by-wire transmission
First Claim
1. A method for determining a mode state in a shift-by-wire transmission in a vehicle having three transmission control modules each having a respective memory, said method comprising:
- writing a remembered mode state into each memory of the at least three control modules; and
reading each memory and if at least two of the remembered mode states match then causing the transmission to enter a mode state corresponding to the at least two remembered mode states which matched.
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Accused Products
Abstract
A voting strategy is used to determine the mode state of a transmission when a vehicle is restarted. A Powertrain Control Module, a Transmission Range Control Module, and a Gear Shift Module communicate through a communication network during execution of the voting strategy. Each module stores a remembered mode state (Normal, Neutral Hold, Neutral Tow, etc.) of the transmission in non-volatile memory. Upon module initialization, the Powertrain Control Module will compare its own remembered mode state of the transmission with the remembered mode state reported by the other two modules. A basic voting strategy is that if two of the three modules report the same remembered mode state then the Powertrain Control Module changes the transmission to that same mode state.
22 Citations
20 Claims
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1. A method for determining a mode state in a shift-by-wire transmission in a vehicle having three transmission control modules each having a respective memory, said method comprising:
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writing a remembered mode state into each memory of the at least three control modules; and reading each memory and if at least two of the remembered mode states match then causing the transmission to enter a mode state corresponding to the at least two remembered mode states which matched. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A method for determining a mode state in a shift-by-wire transmission in a vehicle having three transmission control modules each having a respective memory said method comprising:
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sending a signal carrying a remembered mode state to each memory of the at least three transmission control modules; and reading a signal sent from each memory and if at least two of the remembered mode states match then sending a signal to the transmission causing the transmission to enter a mode state corresponding to the at least two remembered mode states which matched. - View Dependent Claims (11, 12, 13, 14, 15, 16)
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17. A system for remembering a mode state in a vehicle comprising:
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a shift-by-wire transmission including a return to park feature; and a controller including at least three transmission control modules each having a memory, the controller configured to;
write a remembered mode state into each memory of the at least three control modules, the remembered mode state being one of a normal mode state that allows the transmission to automatically shift to Park, a hold mode state that causes the transmission to stay in Neutral and not automatically shift to Park upon detecting a triggering event, or other mode states, read each memory to determine if at least two of the remembered mode states a match; and
cause the transmission to enter a hold mode state corresponding to the at least two remembered mode states that matched. - View Dependent Claims (18, 19, 20)
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Specification