A process for weighing a harvested crop stored in a tank of a harvesting machine, a frame supporting the tank is mounted on a wheel set by a lifting device which is operable to move the frame upwardly and downwardly upon control of a hydraulic system. The process controlling the hydraulic system and includes the steps of: determining at least one height position of the frame on the displacement course; measuring a lowering pressure and a raising pressure in the hydraulic system at the position; calculating, from the measured pressures, a balancing pressure for the frame. The process is performed before unloading the stored crop in order to calculate a loaded balancing pressure and after the unloading in order to calculate an empty balancing pressure. The weight of the stored crop is calculated from a pressure variation between the loaded balancing pressure and the empty balancing pressure.

A process for weighing a harvested crop stored in a tank of a harvesting machine, a frame supporting the tank is mounted on a wheel set by a lifting device which is operable to move the frame upwardly and downwardly upon control of a hydraulic system. The process controlling the hydraulic system and includes the steps of: determining at least one height position of the frame on the displacement course; measuring a lowering pressure and a raising pressure in the hydraulic system at the position; calculating, from the measured pressures, a balancing pressure for the frame. The process is performed before unloading the stored crop in order to calculate a loaded balancing pressure and after the unloading in order to calculate an empty balancing pressure. The weight of the stored crop is calculated from a pressure variation between the loaded balancing pressure and the empty balancing pressure.

A controller (21) of a hydraulic excavator (1) performs a first determination of determining whether or not loading of an object to be worked onto a dump truck (2) by the hydraulic excavator has been conducted based on a posture of a work implement (12), calculates a first load that is a load of the object to be worked loaded onto the dump truck by the hydraulic excavator based on a thrust force of a boom cylinder (16) and on a determination result of the first determination, performs a third determination of determining whether or not the first load is to be integrated based on a determination result of a second determination of determining whether or not the loading of the object to be worked onto the dump truck by the hydraulic excavator has been conducted that is transmitted from a controller (40) of the dump truck and on the determination result of the first determination, and calculates a loaded weight on the dump truck by integrating the first load in a case where it is determined by the third determination that the first load is to be integrated.

A controller (21) of a hydraulic excavator (1) performs a first determination of determining whether or not loading of an object to be worked onto a dump truck (2) by the hydraulic excavator has been conducted based on a posture of a work implement (12), calculates a first load that is a load of the object to be worked loaded onto the dump truck by the hydraulic excavator based on a thrust force of a boom cylinder (16) and on a determination result of the first determination, performs a third determination of determining whether or not the first load is to be integrated based on a determination result of a second determination of determining whether or not the loading of the object to be worked onto the dump truck by the hydraulic excavator has been conducted that is transmitted from a controller (40) of the dump truck and on the determination result of the first determination, and calculates a loaded weight on the dump truck by integrating the first load in a case where it is determined by the third determination that the first load is to be integrated.

A controller obtains a load value within a bucket when a work implement has a basic attitude, as a reference value, and a load value, within the bucket when the work implement has an attitude different from the basic attitude, as a comparison value. The controller generates correction data according to an attitude of the work implement beforehand, based on the reference value and the comparison value. The controller senses a current attitude of the work implement, and calculates a correction amount of a load value within the bucket when the work implement has the current attitude, based on the correction data. The controller corrects a load value within the bucket when the work implement has the current attitude using the correction amount, and obtains a corrected load value.

A controller (18) calculates, based on a target loading weight (P) that is a target value of a total weight of working objects to be loaded into a hauling vehicle, a set loading time number indicative of a loading time number required for the construction machine before the target loading weight (P) is reached and bucket shape information indicative of a shape of a bucket (7), an appropriate loading weight (W.sub.a) that is an appropriate value of the weight of the working objects to be loaded into the hauling vehicle by a single time loading work by the construction machine, creates an appropriate amount illustration (30) that is an illustration of a state at which the working objects of the appropriate loading weight (W.sub.a) are loaded into the bucket and that illustrates the state of the working objects, based on the appropriate loading weight (W.sub.a) and the bucket shape information, and controls a display device (19) to display an illustration (29) of the bucket (7) and the appropriate amount illustration (30) in a superimposed relationship.

A controller (18) calculates, based on a target loading weight (P) that is a target value of a total weight of working objects to be loaded into a hauling vehicle, a set loading time number indicative of a loading time number required for the construction machine before the target loading weight (P) is reached and bucket shape information indicative of a shape of a bucket (7), an appropriate loading weight (W.sub.a) that is an appropriate value of the weight of the working objects to be loaded into the hauling vehicle by a single time loading work by the construction machine, creates an appropriate amount illustration (30) that is an illustration of a state at which the working objects of the appropriate loading weight (W.sub.a) are loaded into the bucket and that illustrates the state of the working objects, based on the appropriate loading weight (W.sub.a) and the bucket shape information, and controls a display device (19) to display an illustration (29) of the bucket (7) and the appropriate amount illustration (30) in a superimposed relationship.

In an unloaded state of the bucket (3), a control device (30) calculates an unloaded moment (M.sub.0) around a hinge pin G from the pressure of the lift arm cylinder that is detected by pressure sensors (15a, 15b), the angle of a lift arm that is detected by a lift arm angle sensor 14, and dimension data extracted from a vehicle body information database (35). In a loaded state of the bucket, the control device calculates a loaded moment (M.sub.1) around the hinge pin G from the pressure of the lift arm cylinder, the angle of the lift arm, and the dimension data extracted from the vehicle body information database. The control device calculates the load (W) on the bucket by dividing the difference between the unloaded moment and the loaded moment by the horizontal distance (L.sub.w) between the hinge pin and the gravity center position of the bucket.

In an unloaded state of the bucket (3), a control device (30) calculates an unloaded moment (M.sub.0) around a hinge pin G from the pressure of the lift arm cylinder that is detected by pressure sensors (15a, 15b), the angle of a lift arm that is detected by a lift arm angle sensor 14, and dimension data extracted from a vehicle body information database (35). In a loaded state of the bucket, the control device calculates a loaded moment (M.sub.1) around the hinge pin G from the pressure of the lift arm cylinder, the angle of the lift arm, and the dimension data extracted from the vehicle body information database. The control device calculates the load (W) on the bucket by dividing the difference between the unloaded moment and the loaded moment by the horizontal distance (L.sub.w) between the hinge pin and the gravity center position of the bucket.

A method for determining an axle load on a vehicle axle of a tractor includes providing a power lift and a payload coupled thereto, driving the power lift by a hydraulic pump, setting a pump pressure of the hydraulic pump as a function of the coupled payload, detecting the pump pressure by a sensor, and determining the axle load as a function of the detected pump pressure from characteristic data which represents a relationship between the pump pressure and the weight of the payload.