Engine accessory torque and engine deceleration rate determination method/system

A method for determining, during vehicle-in-motion conditions, a value of a control parameter (T.sub.ACCES) indicative of accessory torque of a vehicular internal combustion engine (E) in a vehicular automated mechanical tranmission system comprising a fuel throttle-controlled internal combustion engine (E), an operator-set fuel throttle device (P), a multiple-speed change-gear mechanical transmission (10) having an input shaft (16) and an output shaft (90) adapted to drive vehicular drivewheels, said input shaft drivingly connected to said engine by a master friction clutch (C) and a control unit (106) for receiving input signals, including an input signal (ES, IS) indicative of input shaft or engine rotational speed, and for processing said signals in accordance with predetermined logic rules to determine control parameters and to issue command output signals to transmission system actuators, including means for controlling fueling of the engine and means (70) for controlling shifting of the transmission, said method characterized by:

• providing a predetermined relationship ((dES/dt rate)=A+(B * T.sub.ACCES)) between engine deceleration rate (dES/dt rate) and accessory torque (T.sub.ACCES);
• determining, when either one of the transmission is in neutral or the clutch is disengaged, a value of a control parameter (dES/dt rate) indicative of engine deceleration rate;
• determining a value of said control parameter (T.sub.ACCES) indicative of accessory torque as a function of said relationship and the value of said control parameter indicative of engine deceleration rate;
• determining a value of a control parameter (T.sub.FW) indicative of flywheel torque as a function of said value of control parameter indicative of accessory torque (T.sub.ACCES);
• and
• controlling shifting of the transmission as a function of the value of said control parameter indicative of flywheel torque (T.sub.FW).

A method for determining, during vehicle-in-motion conditions, a value of a control parameter (T.sub.ACCES) indicative of accessory torque of a vehicular internal combustion engine (E) in a vehicular automated mechanical tranmission system comprising a fuel throttle-controlled internal combustion engine (E), an operator-set fuel throttle device (P), a multiple-speed change-gear mechanical transmission (10) having an input shaft (16) and an output shaft (90) adapted to drive vehicular drivewheels, said input shaft drivingly connected to said engine by a master friction clutch (C) and a control unit (106) for receiving input signals, including an input signal (ES, IS) indicative of input shaft or engine rotational speed, and for processing said signals in accordance with predetermined logic rules to determine control parameters and to issue command output signals to transmission system actuators, including means for controlling fueling of the engine and means (70) for controlling shifting of the transmission, said transmission system performing dynamic upshifts from an engaged ratio into a target gear ratio in a sequence of operations, all without disengagement of the master clutch and regardless of operator's setting of the throttle device, comprising:

• (a) a predip operation wherein fueling of the engine is manipulated to allow disengagement of the engaged gear ratio;
• (b) after confirmation of disengagement of the engaged gear ratio, a synchronizing operation wherein fueling of the engine is reduced, allowing engine rotational speed to decrease toward the synchronous speed for engagement of the target ratio (ES=IS=OS * GR.sub.T);
• and
• (c) after achieving substantial synchronous rotational speed of said engine and causing engagement of said target gear ratio, a throttle recovery operation wherein fueling of the engine is caused to be controlled by sensed operator setting of said throttle device;
• said method characterized by determining a value of a control parameter (dES/dt rate) indicative of the engine deceleration rate comprising:
• during the predip operation, sensing engine speed;
• sensing initiation of said synchronizing operation, and upon sensing initiation of said synchronizing operation, causing sensed engine speed to equal engine speed initial (RPM.sub.A), and starting a timing sequence;
• sensing initiation of the throttle recovery operation, and upon sensing initiation of said throttle recovery operation, causing engine speed to equal engine speeed final (RPM.sub.B), sensing elapsed time from starting of said timing sequence;
• and
• determining the current value of the control parameter indicative of engine deceleration rate as a function of the difference between engine speed final and engine speed initial and of the elapsed time,
• providing a predetermined relationship ((dES/dt rate)=A+(B * T.sub.ACCES)) between engine deceleration rate (dES/dt rate) and accessory torque (T.sub.ACCES);
• determining a value of said control parameter (T.sub.ACCES) indicative of accessory torque as a function of said relationship and the value of said control parameter indicative of engine deceleration rate;
• and controlling shifting as a function of the valve of said control parameter.

In a vehicular automated mechanical transmission system comprising a fuel throttle-controlled internal combustion engine (E), an operator-set fuel throttle device (P), a multiple-speed change-gear mechanical transmission (10) having an input shaft (16) and an output shaft (90) adapted to drive vehicular drivewheels, said input shaft drivingly connected to said engine by a master friction clutch (C) and a control unit (106) for receiving input signals, including an input signal (ES, IS) indicative of input shaft or engine rotational speed, an input signal (T.sub.GE) indicative of gross engine torque and an input signal (T.sub.BEF) indicative of base engine friction torque, and for processing said signals in accordance with predetermined logic rules to determine control parameters and to issue command output signals to transmission system actuators, including means for controlling fueling of the engine and means (70) for controlling shifting of the transmission, a control system for determining, during vehicle conditions when the engine is at idle and either one of the transmission is in neutral or the master clutch is disengaged, a value of a control parameter (dES/dt rate) indicative of engine deceleration rate, said control system characterized by:

• means for providing a predetermined relationship ((dES/dt rate)=A+(B * T.sub.ACCES)) between engine deceleration rate (dES/dt rate) and accessory torque (T.sub.ACCES);
• means for determining a value of a control parameter (T.sub.ACCES) indicative of accessory torque as a function of gross engine torque and base engine friction torque;
• means for determining a value of said control parameter indicative of engine deceleration rate as a function of the value of said parameter indicative of accessory torque and said relationship;
• means for evaluating feasibility of subsequent upshifts as a function of the value of said control parameter indicative of engine deceleration rate means responsive to said feasibility means for shifting said transmission.

A control system for determining, during vehicle-in-motion conditions, a value of a control parameter (T.sub.ACCES) indicative of accessory torque of a vehicular internal combustion engine (E) in a vehicular automated mechanical tranmission system comprising a fuel throttle-controlled internal combustion engine (E), an operator-set fuel throttle device (P), a multiple-speed change-gear mechanical transmission (10) having an input shaft (16) and an output shaft (90) adapted to drive vehicular drivewheels, said input shaft drivingly connected to said engine by a master friction clutch (C) and a control unit (106) for receiving input signals, including an input signal (ES, IS) indicative of input shaft or engine rotational speed, and for processing said signals in accordance with predetermined logic rules to determine control parameters and to issue command output signals to transmission system actuators, including means for controlling fueling of the engine and means (70) for controlling shifting of the transmission, said control system characterized by:

• means for providing a predetermined relationship ((dES/dt rate)=A+(B * T.sub.ACCES)) between engine deceleration rate (dES/dt rate) and accessory torque (T.sub.ACCES);
• means for determining, when either one of the transmission is in neutral or the clutch is disengaged, a value of a control parameter (dES/dt rate) indicative of engine deceleration rate;
• means for determining a value of said control parameter (T.sub.ACCES) indicative of accessory torque as a function of said relationship and the value of said control parameter indicative of engine deceleration rate;
• means for determining a value of a control parameter (T.sub.FW) indicative of flywheel torque as a function of said value of control parameter indicative of accessory torque (T.sub.ACCES);
• and
• means for controlling shifting of the transmission as a function of the value of said control parameter indicative of flywheel torque (T.sub.FW).