Differential milling and paving

A construction machine, comprising:

• a machine frame;
• a working implement supported from the machine frame for working a ground surface as the construction machine moves in a working direction across the ground surface during a working operation;
• at least one position data determination component operable to determine position data to define a current position of a reference point on the construction machine in a reference system external to the construction machine;
• a controller associated with a memory, the memory having stored therein a working depth data set and a design surface data set, the controller being operable to receive the position data from the at least one position data determination component;
• wherein the working depth data set includes x and y coordinate data in the reference system external to the construction machine, and desired working depth data corresponding to the x and y coordinate data;
• wherein the design surface data set defines a design surface to be created, the design surface data set including x, y and z coordinate data of the design surface in the reference system external to the construction machine;
• and
• wherein the controller is configured such that during the working operation the controller is configured to:
• (a) determine a current x, y position in the reference system external to the construction machine of a right end of the working implement in the working direction during the working operation;
• (b) determine from the working depth data set a desired working depth for the right end of the working implement in the working direction at the current x, y position of the right end of the working implement;
• (c) determine from the design surface data set a desired cross-slope for the working implement at a current location of the working implement corresponding to the current x, y positions of a left end and the right end of the working implement in the working direction;
• and
• (d) control an actual working depth of the working implement by performing at least the following two steps:
• (e)(1) controlling an actual working depth of the right end of the working implement in the working direction to correspond to the desired working depth for the right end of the working implement at the current x, y position of the right end of the working implement;
• and
• (e)(2) controlling an actual cross-slope of the working implement to correspond to the desired cross-slope for the working implement at the current location of the working implement.

A construction machine, comprising:

• a machine frame;
• a working implement supported from the machine frame for working a ground surface as the construction machine moves in a working direction across the ground surface during a working operation;
• at least one position data determination component operable to determine position data to define a current position of a reference point on the construction machine in a reference system external to the construction machine;
• a controller associated with a memory, the memory having stored therein a working depth data set and a design surface data set, the controller being operable to receive the position data from the at least one position data determination component;
• wherein the working depth data set includes x and y coordinate data in the reference system external to the construction machine, and desired working depth data corresponding to the x and y coordinate data;
• wherein the design surface data set defines a design surface to be created, the design surface data set including x, y and z coordinate data of the design surface in the reference system external to the construction machine;
• and
• wherein the controller is configured such that during the working operation the controller is configured to:
• (a) determine a current x, y position in the reference system external to the construction machine of a left end of the working implement in the working direction during the working operation;
• (b) determine a current x, y position in the reference system external to the construction machine of a right end of the working implement in the working direction during the working operation;
• (c) determine from the working depth data set a desired working depth for the left end of the working implement in the working direction at the current x, y position of the left end of the working implement;
• (d) determine from the working depth data set a desired working depth for the right end of the working implement in the working direction at the current x, y position of the right end of the working implement;
• and
• (e) control an actual working depth of the working implement by performing at least the following two steps:
• (e)(1) controlling an actual working depth of the left end of the working implement in the working direction to correspond to the desired working depth for the left end of the working implement at the current x, y position of the left end of the working implement;
• and
• (e)(2) controlling an actual working depth of the right end of the working implement in the working direction to correspond to the desired working depth for the right end of the working implement at the current x, y position of the right end of the working implement.