Vehicle Monitoring and Maintenance (VMM) systems automatically monitors the condition of the vehicle engine components and provide warnings if failures occur. These systems reduce vehicle maintenance and repair costs. VMM systems measures, monitors and reports the status of the critical systems and components of the fleet. They also monitor and report the fuel consumption of the vehicle and can reports mileage and engine hours.
There are some VMM software that are wireless web-based system that enables the maintenance department remotely monitor and diagnose vehicles. From the office, the agency can access and control their entire fleet's electronically controlled components, including engines, transmissions, and braking systems.
The VMM systems are also capable of storing and forwarding message handling guaranteeing message delivery even if the vehicle is out of coverage. Message delivery is done as soon as the vehicle is detected in coverage areas.
VMM systems integrate engine diagnostics information with GPS data, transferring engine fault codes and other vehicle performance metrics to the desktop of maintenance personnel in real time. In monitoring vehicle components, an on-board microcomputer is connected to various input devices: passenger sensors, GPS receiver, ramp deployment signals, and odometer sensor which can record the following characteristics:
- Engine run time
- Door usage
- Cumulative distance
External sensors can also be connected to the on-board microcomputer to record the following:
- Road conditions
- Stress on brakes
The computer uses these devices to store data in its non-volatile memory. When a vehicle returns to the garage, the data is downloaded via a high-speed link to the garage computer. From there, the data is made available for final processing to the end user via the local computer network. Detailed statistics can be obtained using a preventive maintenance software application.