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A vehicle control system for an automatic transmission includes a range selector for outputting a range instruction signal representing the selected shift range and a range shifter for manually outputting a shift instruction signal, and a by-wire control part for controlling the change-over of the s

A vehicle control system for an automatic transmission includes a range selector for outputting a range instruction signal representing the selected shift range and a range shifter for manually outputting a shift instruction signal, and a by-wire control part for controlling the change-over of the shift range according to the range instruction signal input from the range selector. The by-wire control part has a range control circuit, which uses the shift instruction signal input from the range shifter if the range instruction signal is abnormal while monitoring the range instruction signal input from the range selector.

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1. A vehicle control system for an automatic transmission of a vehicle, the vehicle control system comprising: a first operation part operable for issuing an instruction for shifting a range of the automatic transmission and outputting a first instruction signal representing an instruction for shift

1. A vehicle control system for an automatic transmission of a vehicle, the vehicle control system comprising: a first operation part operable for issuing an instruction for shifting a range of the automatic transmission and outputting a first instruction signal representing an instruction for shifting the range;a second operation part provided separately from the first operation part, the second operation part being operable for issuing an instruction concerning an additional function in addition to essential functions that are essential for driving the vehicle and outputting a second instruction signal representing an instruction related to the additional function; anda by-wire control part for controlling a change-over of the shift range normally according to the first instruction signal input from the first operation part as a reference signal, wherein:the by-wire control part includes signal monitoring means for monitoring the first instruction signal input from the first operation part, and substitute processing means which uses the second instruction signal input from the second operation part as the reference signal to control the change-over of the shift range if the first instruction signal is determined to be abnormal by the signal monitoring means;the second operation part is configured to instruct a transmission gear ratio to the automatic transmission, the essential function of which is to automatically change the transmission gear ratio and the additional function of which is to manually change the transmission gear ratio;the second operation part is further configured to instruct the transmission gear ratio to be shifted up and down;the substitute processing means uses, if the signal monitoring means has determined that the first instruction signal is abnormal, the second instruction signal representing a shift-up as the reference signal for instructing either a forward range or a reverse range among a plurality of shift ranges, and the second instruction signal representing the shift-down as the reference signal for instructing the other one of the forward range or the reverse range; the second operation part is capable of alternately receiving an operation for instructing the shift-up and an operation for instructing the shift-down, and outputs the second instruction signal representing alternate receipt of the two operations; andthe substitute processing means uses the second instruction signal representing the alternate receipt as the reference signal for instructing a neutral range among the plurality of shift ranges if the signal monitoring means has determined that the first instruction signal is abnormal. 2. The vehicle control system according to claim 1, wherein: the second operation part includes an up-operation member and a down-operation member that are operable independently of each other for instructing the shift-up and the shift-down, respectively. 3. The vehicle control system according to claim 1, further comprising: a parking brake operation pan that is operable separately from the first operation part to instruct a parking brake of the vehicle to turn on or off, and outputs a brake instruction signal representing an on instruction or off instruction;wherein the substitute processing means uses the brake instruction signal representing the on instruction of the parking brake as the reference signal for instructing a parking range among the plurality of shift ranges if the signal monitoring means has determined that the first instruction signal is abnormal. 4. The vehicle control system according to claim 1, wherein: the second operation part is capable of simultaneously receiving an operation for instructing the shift-up and an operation for instructing the shift-down, and outputs the second instruction signal representing simultaneous receipt of the two operations; andthe substitute processing means uses the second instruction signal representing the simultaneous receipt as the reference signal for instructing a neutral range among the plurality of shift ranges if the signal monitoring means has determined that the first instruction signal is abnormal. 5. The vehicle control system according to claim 1, further comprising: a switch operation part provided separately from the first operation part to instruct an engine of the vehicle to turn off or on and output a switch instruction signal representing an on instruction or off instruction;wherein the substitute processing means uses the switch instruction signal representing the of instruction as the reference signal for instructing a parking range among the plurality of shift ranges if the signal monitoring means has determined that the first instruction signal is abnormal. 6. The vehicle control system according to claim 1, wherein: the by-wire control part has speed monitoring means for monitoring a speed of the vehicle; andthe substitute processing means uses the second instruction signal as the reference signal, if the signal monitoring means has determined that the first instruction signal is abnormal and the speed monitoring means has determined that the speed is lower than a preset threshold value. 7. The vehicle control system according to claim 1, wherein: the by-wire control part has foot brake monitoring means for monitoring whether a foot brake of the vehicle is in an on state or off state; andthe substitute processing means uses the second instruction signal as the reference signal, if the signal monitoring means has determined that the first instruction signal is abnormal and the foot brake monitoring means has determined that the foot brake is in the on state. 8. The vehicle control system according to claim 1, wherein: the by-wire control part has accelerator monitoring means for monitoring whether an accelerator of the vehicle is in an on state or an off state; andthe substitute processing means uses the second instruction signal as the reference signal, if the signal monitoring means has determined that the first instruction signal is abnormal and the accelerator-monitoring means has determined that the accelerator is in the off state. 9. The vehicle control system according to claim 1, wherein: the by-wire control part has alarm means for outputting an alarm indicating an abnormal condition if the signal monitoring means has determined that the first instruction signal is abnormal. 10. The vehicle control system according to claim 9, wherein: the second operation part receives a predetermined operation and outputs the second instruction signal representing a response to the alarm indicating the abnormal condition issued by the alarm means; andthe substitute processing means uses the second instruction signal representing content of instruction different from the response as the reference signal after the second instruction signal representing the response has been input from the second operation part. 11. The vehicle control system according to claim 1, wherein: the by-wire control part has guide means which provides instructions for operating the second operation part for instructing the shift range, if the signal monitoring means has determined that the first instruction signal is abnormal.