Engine idling stop apparatus, system thereof and signal display apparatus used in the system

An automobile engine idling stop apparatus, comprising:

• receiver means for receiving a signal transmitted from roadside and indicated a period of time from a present time until a traffic signal changes;
• detection means for detecting the state of an automobile including the running condition thereof;
• and
• control means for controlling an idling stop based on the signal received by said receiver means and the state of the automobile detected by said detection means,
• wherein said control means stops the idling in the case that an amount of fuel that can be reduced by such an idling stop exceeds an amount of fuel consumed excessively by engine restart.

An automobile engine idling stop apparatus, comprising:

• receiver means for receiving a signal transmitted from roadside and indicated a period of time from a present time until a traffic signal changes;
• detection means for detecting the state of an automobile including the running condition thereof;
• and
• control means for controlling an idling stop based on the signal received by said receiver means and the state of the automobile detected by said detection means,
• wherein a frequency of the signal becomes a first frequency when the indication of the traffic signal is changed to a stop (red) signal and reaches a second frequency when the stop signal is changed to green, and wherein the frequency of the signal is continuously shifted from the first frequency to the second frequency over the period of the stop signal.