  We present a tool called HHLPar for verifying hybrid systems modelled in
Hybrid Communicating Sequential Processes (HCSP). HHLPar is built upon a Hybrid
Hoare Logic for HCSP, which is able to reason about continuous-time properties
of differential equations, as well as communication and parallel composition of
parallel HCSP processes with the help of parameterised trace assertions and
their synchronization. The logic was formalised and proved to be sound in
Isabelle/HOL, which constitutes a trustworthy foundation for the verification
conducted by HHLPar. HHLPar implements the Hybrid Hoare Logic in Python and
supports automated verification: On one hand, it provides functions for
symbolically decomposing HCSP processes, generating specifications for separate
sequential processes and then composing them via synchronization to obtain the
final specification for the whole parallel HCSP processes; On the other hand,
it is integrated with external solvers for handling differential equations and
real arithmetic properties. We have conducted experiments on a simplified
cruise control system to validate the performance of the tool.
