| 摘要 |
<p>An internal combustion has preset but adjustable ignition timing control (4) and/or preset but adjustable fuel injection control (5). A microprocessor (1) is programmed to adjust the controls (4) and (5) so that the operator (e.g. driver of a vehicle incorporating the engine) can 'tune' the engine by pressing a start button (3) to energise the microprocessor. The latter illuminates a lamp (6) instructing the driver to depress the accelerator rapidly. The microprocessor measures the time taken to accelerate the engine (under no load) from one speed to another the speeds being measured by a tachometer (2). This time is compared with a stored value obtained when the engine is in tune. If the time exceeds the stored value, the microprocessor makes an incremental adjustment to one of the controls (4, 5) and signals the driver by lamp (6) to repeat the test. If the result is worse, the adjustment is reversed and the test repeated, adjusting both controls (4, 5) until an optimum result is obtained and indicated by a lamp (7).</p> |
