Automatic engine stop and start system
AssigneeDenso Corporation
InventorsMasaru Kamiya, Akira Kato, Naoki Tanaka
Life of this patent
Estimating the term…
Abstract
An engine automatic stop and start system monitors a booster negative pressure and a braking operation. A combination of the booster negative pressure and the brake operation can effectively indicate that a booster negative pressure will be insufficient to ensure a brake function. The controller evaluates the booster negative pressure and the brake operation, and restarts the engine when it is estimated that the booster negative pressure may be decreased below a threshold. As a result, it is possible to restart the engine before the booster negative pressure is decreased.
Claims13
An automatic engine stop and start system comprising:
- negative pressure detecting means for detecting negative pressure of a brake booster for assisting a braking operation, the negative pressure being supplied by an engine or an apparatus driven by the engine;
- braking operation detecting means for detecting a braking operation of a driver;
- and
- a controller for instructing automatic stopping or automatic starting of the engine under establishment of a predetermined condition of the engine based on an input signal, wherein the controller instructs the automatic starting of the engine when it is determined that there is carried out a predetermined braking operation for bringing about, as a result, a situation in which the booster negative pressure is estimated to be smaller than a predetermined threshold based on the booster negative pressure and the braking operation.
An automatic engine stop and start system comprising:
- negative pressure detecting means for detecting a negative pressure of a negative pressure source generated by an engine or an apparatus driven by the engine and supplied to a brake booster for assisting a braking operation;
- master cylinder pressure detecting means for detecting a pressure of a brake master cylinder;
- braking operation detecting means for detecting the braking operation of a driver;
- and
- a controller for instructing automatic stopping or automatic starting of the engine under establishment of a predetermined condition of the engine based on an input signal, the controller instructs the automatic starting when it is determined that there is carried out a predetermined braking operation for bringing about, as a result, a situation in which the booster negative pressure is estimated to be smaller than a predetermined threshold based on the negative pressure of the negative source, the pressure of the brake master cylinder and the braking operation.
An automatic engine stop and start system comprising:
- a brake system having a brake booster for assisting a braking operation of a driver by using a negative pressure generated by an engine or an apparatus driven by the engine;
- a controller for instructing automatic stopping or automatic starting of the engine under establishment of a predetermined condition of the engine based on an input signal;
- and
- downward road detecting means for detecting that a vehicle runs on a downward road, wherein the controller prohibits the engine from being stopped in running on the downward road.
Dependencies are inferred from the claim text.