Aftermarket control kits, systems, and methods are operable for use in a vehicle retrofitted with a non-original powertrain having an OEM engine control module and without an OEM body control module. A kit includes, for example, an aftermarket control module operably connectable to the non-original powertrain via a vehicle communication bus in the retrofitted vehicle without the body control module, and the aftermarket control module is adapted to receive control signals from a driver activatable control switch and provide data via the vehicle communication bus so that the non-original powertrain without the body control module is operable to operate the vehicle in response to the driver activatable control signals. The aftermarket control module may be an aftermarket cruise control module, an aftermarket manumatic transmission control module, or a combination aftermarket cruise control module and manumatic transmission control module.

A device for determining a tachometer characteristic curve of a motor vehicle includes a detection apparatus and a determining apparatus. The determining apparatus is configured to form a tachometer characteristic curve on the basis of one or more mean value pairs, which are formed by means of one locomotion signal mean value and one speed mean value, by means of which tachometer characteristic curve locomotion signals and speed values are converted into one another, and/or to change a tachometer characteristic curve which is already present.

A prime mover control device of a work vehicle equipped with a torque converter includes: a speed ratio calculation unit that calculates a speed ratio of the torque converter; and a rotational speed limit unit that, when a speed ratio falls within a preset speed ratio range, limits a maximum rotational speed of the prime mover to be lower as compared with a maximum rotational speed set when a speed ratio falls without the preset speed ratio range. When a state in which the speed ratio calculated by the speed ratio calculation unit falls within the preset speed ratio range is maintained for a predetermined time period, the rotational speed limit unit changes a maximum rotational speed of the prime mover to a higher maximum rotational speed than the limited maximum rotational speed limited to be lower by the rotational speed limit unit.

Provided is a vehicle travel control apparatus including: a vehicle controller configured to execute constant speed travel control for causing a vehicle to travel at a target speed, and configured to execute a target speed increasing process of increasing the target speed by a predetermined speed increase amount; a display device configured to display a setting screen which allows a driver to change at least the speed increase amount; and a memory configured to store the speed increase amount changed on the setting screen, the vehicle controller being further configured to execute the target speed increasing process in accordance with the speed increase amount which has been stored in the memory.

Provided is a vehicle travel control apparatus including: a vehicle controller configured to execute constant speed travel control for causing a vehicle to travel at a target speed, and configured to execute a target speed increasing process of increasing the target speed by a predetermined speed increase amount; a display device configured to display a setting screen which allows a driver to change at least the speed increase amount; and a memory configured to store the speed increase amount changed on the setting screen, the vehicle controller being further configured to execute the target speed increasing process in accordance with the speed increase amount which has been stored in the memory.

A device for determining a tachometer characteristic curve of a motor vehicle includes a detection apparatus and a determining apparatus. The determining apparatus is configured to form a tachometer characteristic curve on the basis of one or more mean value pairs, which are formed by means of one locomotion signal mean value and one speed mean value, by means of which tachometer characteristic curve locomotion signals and speed values are converted into one another, and/or to change a tachometer characteristic curve which is already present.

In accordance with an aspect of the present disclosure, cruise control of an automotive vehicle in a fuel economy cruise control mode controls vehicle speed to be within a fuel economy speed band about a cruise control set speed so that instantaneous fuel economy is at least equal to average fuel economy.

A cruise control system for a vehicle having an engine and a power take-off throttle control capable of controlling the speed of the engine includes a cruise control device in communication with a speedometer of the vehicle and the power take-off throttle control. The cruise control device includes a processor configured for receiving a user selection of a set ground speed, determining a current ground speed of the vehicle, via communication with the speedometer, comparing the current ground speed with the set ground speed, and taking further action to maintain the current ground speed close to the set ground speed. The further action taken by the processor may include transmitting an acceleration signal or deceleration signal to the power take-off throttle control to increase or decrease a speed of the engine if the current ground speed is determined to be lower or higher than the set ground speed.

A number-of-operations information storage unit (113) stores number-of-operations information in which a plurality of conditions of the vehicle is defined and number of acceleration operations and number of deceleration operations performed by a vehicle are described for each condition defined. A correction speed specifying unit (109) detects a current condition of the vehicle, when the vehicle travels at a constant speed, extracts number of acceleration operations and number of deceleration operations described for a condition corresponding to the detected current condition of the vehicle from the number-of-operations information, compares the extracted number of acceleration operations with the extracted number of deceleration operations, specifies a correction speed higher than a set speed for a constant-speed travel if the number of acceleration operations is larger than the number of deceleration operations, and specifies a correction speed lower than the set speed if the number of deceleration operations is larger than the number of acceleration operations. A constant-speed travel control unit (108) makes the vehicle travel at a constant speed based on the correction speed specified by the correction speed specifying unit (109).

In accordance with an aspect of the present disclosure, cruise control of an automotive vehicle in a fuel economy cruise control mode controls vehicle speed to be within a fuel economy speed band about a cruise control set speed so that instantaneous fuel economy is at least equal to average fuel economy.