Hill hold control apparatus for vehicle

A hill hold control apparatus of a vehicle having an automatic transmission including a plurality of drive gears mounted on an input shaft, a plurality of driven gears meshing with said drive gears and mounted on an output shaft and a bypass clutch for engaging said input shaft with said output shaft, comprising:

• grade judging means for judging that said vehicle travels on a grade;
• shift gear train detecting means for detecting a shift gear train of said automatic transmission;
• foot brake operation detecting means for detecting an operation of a foot brake;
• and
• control means for engaging said bypass clutch when it is judged that said vehicle is in standstill and said shift gear train is a start gear train and said foot brake is inoperative based on respective signals of said grade judging means, said shift gear train detecting means and said foot brake operation detecting means.

A hill hold control apparatus of a vehicle having an automatic transmission including a plurality of drive gears mounted on an input shaft, a plurality of driven gears meshing with said drive gears and mounted on an output shaft and a bypass clutch for engaging said input shaft with said output shaft, comprising:

• grade judging means for judging that said vehicle travels on a grade;
• shift gear train detecting means for detecting a shift gear train of said automatic transmission;
• foot brake operation detecting means for detecting an operation of a foot brake;
• first control means for partially engaging said bypass clutch when it is judged that said vehicle is in standstill and said shift gear train is a start gear train and said foot brake is operative based on respective signals of said grade judging means, said shift gear train detecting means and said foot brake;
• and
• second control means for engaging said bypass clutch when it is judged that said vehicle is in standstill and said foot brake is inoperative based on respective signals of said grade judging means, said shift gear train detecting means and said foot brake operation detecting means.

A hill hold control apparatus of a vehicle having an automatic transmission including a plurality of drive gears mounted on an input shaft, a plurality of driven gears meshing with said drive gears and mounted on an output shaft and a bypass clutch for engaging said input shaft with said output shaft, comprising:

• grade judging means for judging that said vehicle travels on a grade;
• shift gear train detecting means for detecting a shift gear train of said automatic transmission;
• parking brake operation detecting means for detecting an operation of a parking brake;
• first control means for partially engaging said bypass clutch when it is judged that said vehicle is in standstill and said shift gear train is a start gear train and said parking brake is operative based on respective signals of said grade judging means, said shift gear train detecting means and said parking brake operation detecting means;
• and
• second control means for engaging said bypass clutch when it is judged that said vehicle is in a standstill and said shift gear train is a start gear train and said parking brake is inoperative based on respective signals of said grade judging means, said shift gear train detecting means and said parking brake operation detecting means.

A method for controlling a vehicle to hold its position on a hill, said vehicle having an automatic transmission including a plurality of drive gears mounted on an input shaft, a plurality of driven gears meshing with said drive gears and mounted on an output shaft and a bypass clutch for engaging said input shaft with said output shaft, the method comprising:

• judging that said vehicle travels on a grade;
• detecting a shift gear train of said automatic transmission;
• and
• engaging said bypass clutch when it is judged that said vehicle is in standstill and said shift gear train is a start gear train.

A method for controlling a vehicle to hold its position on a hill, said vehicle having an automatic transmission including a plurality of drive gears mounted on an input shaft, a plurality of driven gears meshing with said drive gears and mounted on an output shaft and a bypass clutch for engaging said input shaft with said output shaft, the method comprising:

• judging that said vehicle travels on a grade;
• detecting a shift gear train of said automatic transmission;
• detecting an operation of a foot brake;
• and
• engaging said bypass clutch when it is judged that said vehicle is in standstill and said shift gear train is a start gear train and said foot brake is inoperative.

A method for controlling a vehicle to hold its position on a hill, said vehicle having an automatic transmission including a plurality of drive gears mounted on an input shaft, a plurality of driven gears meshing with said drive gears and mounted on an output shaft and a bypass clutch for engaging said input shaft with said output shaft, the method comprising:

• judging that said vehicle travels on a grade;
• detecting a shift gear train of said automatic transmission;
• detecting an operation of a foot brake;
• partially engaging said bypass clutch when it is judged that said vehicle is in standstill and said shift gear train is a start gear train and said foot brake is operative;
• and
• engaging said bypass clutch when it is judged that said vehicle is in standstill and said foot brake is inoperative.

A method for controlling a vehicle to hold its position on a hill, said vehicle having an automatic transmission including a plurality of drive gears mounted on an input shaft, a plurality of driven gears meshing with said drive gears and mounted on an output shaft and a bypass clutch for engaging said input shaft with said output shaft, the method comprising:

• judging that said vehicle travels on a grade;
• detecting a shift gear train of said automatic transmission;
• detecting an operation of a parking brake;
• partially engaging said bypass clutch when it is judged that said vehicle is in standstill and said shift gear train is a start gear train and said parking brake is operative;
• and
• engaging said bypass clutch when it is judged that said vehicle is in a standstill and said shift gear train is a start gear train and said parking brake is inoperative.